JP6421932B2 - Gas trap - Google Patents

Description

  The present invention relates to a gas trap. More specifically, the present invention relates to a gas trapping device that traps a gas supplied to a liquid in the liquid.

  When recovering valuable components contained in minerals, there is a flotation process as a method for separating valuable components in minerals from other components. In this flotation, a pulverized product obtained by pulverizing minerals is mixed with a liquid such as water to form a slurry, and air is blown into the slurry. Then, among the pulverized products, those having high affinity with air are lifted, so that they can be separated into the pulverized product that floats and other pulverized products. In flotation, a plurality of reagents such as a foaming agent and a scavenger are added to the slurry in order to lift the pulverized material together with air. By adjusting the reagents to be added, desired valuable components can be obtained. The pulverized material is raised with the air.

  In this flotation, the ability to separate the pulverized product into a floating product and a pulverized product other than that (that is, a settled pulverized product) varies depending on the amount of air blown into the slurry. For example, when the amount of air blown into the slurry increases, a pulverized product containing a desired valuable component easily floats and improves the recoverability, but other pulverized products also easily float. For this reason, if the amount of air blown into the slurry increases, the impurities contained in the recovered pulverized product will increase. Therefore, in order to improve the quality of the recovered pulverized material while improving the recoverability of the pulverized material containing a desired valuable component, it is necessary to appropriately control the amount of air blown into the slurry.

  Currently, the air inflow speed Jg is used as one of the indexes for controlling the amount of air blown into the slurry in the flotation machine (for example, Patent Document 1). This air inflow speed Jg is normally calculated based on the time from trapping bubbles in the slurry until the amount of trapped bubbles reaches a predetermined amount. During the operation of the flotation machine, the air inflow speed Jg is confirmed by appropriately capturing bubbles in the slurry, and the operation status is grasped.

  By the way, when performing flotation with a flotation machine, the air inflow speed Jg varies depending on the properties of minerals, valuable components to be recovered, and reagents to be added. For this reason, before operating with a real machine, the air inflow speed Jg suitable for the mineral etc. which are float-sorted is confirmed by the laboratory level. Then, in the actual machine, the amount of air supplied to the slurry is adjusted so that the air inflow speed Jg obtained at the laboratory level is obtained.

JP 2012-115781 A

  However, at the laboratory level, a small amount of slurry is placed in a container such as a beaker, and the experiment is performed by supplying air to the slurry in the container. However, when the amount of the slurry is small, it is difficult to accurately capture the bubbles in the slurry, so it is difficult to accurately measure the air inflow speed Jg in the slurry.

  If the air supplied to the slurry can be accurately captured in a laboratory-level experiment, the air inflow velocity Jg suitable for the mineral to be subjected to the flotation ore can be accurately grasped, and thus such an apparatus is required. .

  In view of the above circumstances, an object of the present invention is to provide a gas trapping device that can trap gas easily and accurately even when supplying gas to a small amount of liquid.

A gas trapping device according to a first aspect of the present invention is a gas trapping device used for measuring an air inflow rate of air flowing into a slurry, comprising a trapping unit that traps the gas that is immersed in the slurry in flotation and supplied to the slurry. The capturing part is formed in a hollow structure having a hollow space continuous from an opening formed at one end, and has a communication passage communicating between the hollow space and the other end. A communication blocking portion having a function of blocking communication between the communication passage of the capturing portion and the outside, and the communication blocking portion is formed in a hollow space of the capturing portion. A pump means having a fluid supply function for supplying slurry for preventing gas from entering the space is provided.
Gas capture device of the second invention, is immersed in the fluid gas is continuously supplied, a gas capture device having a capture portion for capturing the gas supplied to said fluid, said capture portion has one end And a communication passage that communicates between the hollow space and the other end, the communication passage of the capturing part. And a communication blocking portion having a function of blocking communication between the trapping portion and the outside, and the communication blocking portion prevents gas from entering the hollow space of the capturing portion into the hollow space of the capturing portion. characterized in that it comprises a pump means having a fluid supply function of supplying fluid.
According to a third aspect of the present invention, there is provided the gas capturing device according to the first or second aspect, wherein the communication blocking part includes a pump unit having a suction function for sucking a fluid in a hollow space of the capturing part. To do.
According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the communication blocking portion includes a tube communicating the communication passage and the pump means, and between the tube and the communication passage. And a three-way valve provided between the tube and the pump means, and one nozzle of the three-way valve is open to the atmosphere.
According to a fifth aspect of the present invention, in the first, second, third or fourth invention, the communication blocking part is detachably connected to the capturing part.
The gas trapping device according to a sixth aspect of the present invention is the first, second, third, fourth or fifth aspect, wherein the trapping part has a structure that allows the inside of the hollow space to be visually recognized from the outside. Features.

According to the first aspect of the present invention, the capture portion is disposed so that one end of the capture portion is immersed in the slurry, and the hollow space of the capture portion is filled with the slurry, and the communication blocking portion is provided between the communication passage and the outside. By shutting off, the gas supplied to the slurry can be captured in the hollow space of the capturing part. Then, based on the amount of gas trapped in the hollow space of the trapping portion within a predetermined time, it is possible to easily and continuously measure the air inflow rate in the flotation. Moreover, if the fluid supply function of the pump means is made to function after the measurement, the slurry is supplied into the hollow space of the capturing part by the fluid supply function of the pump means even if gas is continuously supplied to the slurry. The hollow space of the capturing part can be filled with the slurry so that the capturing part can capture the gas. That is, even if gas is continuously supplied to the slurry, the trapping portion can be returned to a state where the gas can be trapped after trapping the gas, so that the trapping of the gas can be performed continuously to some extent.
According to the second invention, in a state where the capturing part is disposed so that one end of the capturing part is immersed in the fluid , the hollow space of the capturing part is filled with the fluid , and the communication blocking part is provided between the communication passage and the outside. By shutting off, the gas supplied to the fluid can be captured in the hollow space of the capturing unit. Then, based on the amount of gas trapped in the hollow space of the capturing part within a predetermined time, it is possible to grasp the air inflow speed to the fluid . Further, after measurement, if the function of fluid supply function of the pump means, be supplied gas continuously to the fluid, by supplying a fluid to the hollow space of the capturing portion by the fluid supply function of the pump means The hollow space of the trap part can be filled with a fluid so that the trap part can trap the gas. That is, even if gas is continuously supplied to the fluid , after capturing the gas, the capturing unit can be returned to a state where the gas can be captured, so that the gas can be captured to some extent continuously.
According to the third invention, if the suction function of the pump means is made to function, the gas can be discharged from the hollow space of the capturing part to fill the hollow space of the capturing part with the fluid , and the capturing part can capture the gas. State.
According to the fourth aspect of the present invention, if the three-way valve is operated to connect the one nozzle and the communication passage, the gas can be discharged from the hollow space of the capturing part without operating the pump means. That is, even if the pump means is not operated, the capturing part can be brought into a state in which the gas can be captured, so that the preparatory work for bringing the gas into a state can be simplified.
According to the fifth aspect of the invention, since the capturing part can be changed according to the conditions for capturing gas, the gas can be captured appropriately.
According to the sixth aspect of the invention, since the situation in the hollow space can be grasped from the outside, the amount of trapped air can be easily grasped.

It is a schematic explanatory drawing of the gas capture | acquisition apparatus 1 of this embodiment, (A) is a side view, (B) is a BB arrow directional cross-sectional arrow view of (A). It is explanatory drawing of the use condition of the gas capture | acquisition apparatus 1 of this embodiment, (A) is the state which filled the inside of the hollow space 3h with the liquid L, (B) captures the gas A in the hollow space 3h. It is in the state.

  The gas capturing device of the present invention captures and captures gas supplied to a liquid, and is used to capture bubbles that move while rising in the liquid while being immersed in the liquid. Is.

  The liquid in which the gas trapping device of the present invention is immersed is not particularly limited. For example, a slurry in which powder and liquid are mixed, water, a liquid obtained by repeated flotation, and the like can be mentioned, but there is no particular limitation.

  The gas trapped by the gas trapping device of the present invention is not particularly limited. It can be used for trapping gases such as air, nitrogen and argon.

  Further, the purpose of trapping gas by the gas trapping apparatus of the present invention is not particularly limited. For example, it can be used to measure the flow rate of the gas supplied to the liquid or to grasp the amount of gas passing through a predetermined region of the liquid and the flow velocity thereof.

(Gas capture device 1 of this embodiment)
In FIG. 1, the code | symbol 2 has shown the capture part 2 of the gas capture device 1 of this embodiment. The capturing unit 2 includes a main body unit 3 and a seal unit 4.

  The main body 3 of the capturing unit 2 is formed of a hollow cylindrical member having openings 3s and 3d at both ends thereof. The main body 3 is configured such that the hollow space 3h inside thereof can be visually recognized through the side surface. For example, the main body 3 is formed of a cylindrical pipe made of transparent glass or plastic. A scale 3 m is formed on the side surface of the main body 3. The scale 3m is formed at substantially equal intervals from one end to the other end of the main body 3 (from the lower end to the upper end in FIG. 1A).

  As shown in FIG. 1, the other opening 3d of the main body 3 is provided with a seal portion 4 that closes the opening 3d in a liquid-tight and air-tight manner. The seal portion 4 is provided with a communication passage 4h that allows communication between the inside of the main body portion 3 and the outside. Specifically, the communication passage 4h has one opening (the lower opening in FIG. 1 (A)) facing the hollow space 3h in the seal portion 4, and the other opening in FIG. 1 (B). ) Is located on the outer surface.

  As shown in FIG. 1, one nozzle 11 a in the valve 11 of the communication blocking unit 10 is attached to the other opening of the communication passage 4 h of the seal unit 4 in a liquid-tight and air-tight manner. The valve 11 is a three-way valve. Of the two nozzles 11b and 11c other than the nozzle 11a, the nozzle 11b is open to the atmosphere, and the base end of the tube 12 is attached to the nozzle 11c. Therefore, by operating the valve 11, the communication passage 4h can be communicated with either the tube 12 or the outside, or can be blocked from both. In the following description, blocking the communication passage 4h from both the tube 12 and the outside is simply referred to as “closing the valve 11 of the communication blocking unit 10”.

  As shown in FIG. 1, the gas trap 1 of the present embodiment includes a pump unit 13 connected to the distal end portion of the tube 12. The pump means 13 includes a suction function for sucking fluid (gas and / or liquid) in the hollow space 3h of the main body 3 through the tube 12, the valve 11 and the communication passage 4h, and the tube 12, the valve 11 and the communication passage 4h. And a fluid supply function for supplying fluid into the hollow space 3h of the main body 3 through the through hole.

For example, when a roller pump is used as the pump means 13, the supply / discharge of fluid to / from the hollow space 3 h can be switched by switching the forward / reverse rotation of the roller pump.
Specifically, if the roller pump is operated so that the fluid flows from the main body 3 toward the pump means 13, the fluid in the hollow space 3h can be discharged to the outside (suction function). For example, if the tip of the tube 12 is opened to the atmosphere, the gas or liquid in the hollow space 3h can be discharged to the outside.
Conversely, if the roller pump is operated so that the fluid flows from the pump means 13 toward the main body 3, the fluid can be supplied into the hollow space 3h (fluid supply function). For example, if the tip of the tube 12 is immersed in the liquid, the liquid can be supplied into the hollow space 3h.

(Measurement method of the gas trap 1 of the present embodiment)
Since it has the structure as described above, if the gas trapping apparatus 1 of the present embodiment is used, it is possible to trap bubbles that move while rising in the liquid.

  First, as shown in FIG. 2, the main body 3 of the capturing part 2 is arranged so that one end thereof (that is, the end where the opening 3s is formed) is located below and the other end is located above. The one end is immersed in the liquid L. In this state, the valve 11 is operated to connect the communication passage 4h to the tube 12. And if the pump means 13 is operated and the gas A and the liquid L in the hollow space 3h of the main body 3 are sucked, the hollow space 3h of the main body 3 is filled with the liquid L (FIG. 2A). reference). When the hollow space 3h is filled with the liquid L, the operation of the pump means 13 is stopped and the valve 11 is closed. Then, the preparation for capturing the gas A is completed.

  The method for filling the hollow space 3h of the main body 3 with the liquid L is not limited to the above method. For example, after filling the hollow space 3h with the liquid L in advance, the main body part 3 is installed upside down in the liquid L (for example, inside the flotation machine), or the liquid L is poured from the pump means 3 into the hollow space 3h. The hollow space 3h of the main body 3 can be filled with the liquid L also by a method such as supplying and putting it in.

  When the preparation for capturing the gas A is completed, the gas A is supplied to the liquid L (see FIG. 2B). Then, the gas A flows from the opening 3 s of the main body 3 of the capturing unit 2, and the gas A is captured in the hollow space 3 h of the main body 3. Since the main body 3 can visually recognize the inside of the hollow space 3h from the outside, the amount of the gas A trapped in the hollow space 3h can be confirmed.

  And when it becomes the condition which satisfy | fills a predetermined condition, the capture | acquisition of the gas A is complete | finished. For example, when the amount of the trapped gas A reaches a predetermined amount, or when a certain time has elapsed since the start of trapping the gas A, the trapping ends.

  When the gas A is continuously captured, the gas A is removed from the hollow space 3h of the main body 3 so that the hollow space 3h of the main body 3 is filled with the liquid L. As a result, the gas A can be captured again.

  The method for removing the gas A from the hollow space 3h of the main body 3 after completion of capturing and filling the hollow space 3h of the main body 3 with the liquid L is not particularly limited.

  For example, the gas A can be extracted from the hollow space 3 h of the main body 3 by operating the valve 11 to communicate the nozzle 11 b with the communication passage 4 h. In this case, since the gas A can be discharged from the hollow space 3h of the main body 3 without operating the pump means 13, the preparation work for capturing the gas A can be simplified.

  On the other hand, if the valve 11 is operated to connect the communication passage 4h to the tube 12 and the pump means 13 is operated to suck the gas A and the liquid L in the hollow space 3h of the main body 3, the hollow of the main body 3 can be obtained. The gas A in the empty space 3h can be removed to fill the hollow space 3h with the liquid L. In addition, by operating the pump means 13 to supply the liquid L into the hollow space 3h of the main body 3, the gas in the hollow space 3h of the main body 3 is evacuated and the hollow L 3h is filled with the liquid L. Can be satisfied. In this way, when the pump means 13 is operated to extract the gas A in the hollow space 3h of the main body 3 and the hollow space 3h is filled with the liquid L, the capturing unit 2 can capture the gas A. Time to become can be shortened. Then, it is possible to shorten the time from the start of the acquisition preparation or the end of the acquisition to the start of the acquisition.

  In particular, when the gas A is continuously supplied to the liquid L while being continuously captured, it is preferable to operate the pump means 3 to fill the hollow space 3h of the main body 3 with the liquid L as described above. desirable. If the supply of the gas A to the liquid L is continued, the intrusion of the gas A into the hollow space 3h of the main body 3 continues while preparing for the next capture. Therefore, in order to prevent the intrusion of the gas A into the hollow space 3h of the main body portion 3 during the preparation for capturing, the pump means 13 is operated and the hollow space 3h of the main body portion 3 is operated. It is preferable to employ a method of supplying the liquid L to the liquid.

(About material of capture part 2)
As described above, the material of the capturing unit 2 is not particularly limited as long as it is formed of a material that allows the inside to be visually recognized from the outside and the amount of gas in the inside can be grasped from the outside. It is desirable that the material is formed of a material that is not damaged by the property of the gas to be trapped, the property of the liquid that supplies the gas, the temperature of the liquid, and the impact or pressure that may be applied during measurement or handling. For example, as the material of the capturing part 2, plastics such as vinyl chloride and polypropylene, and hard glass are easy to use.

(About the transmission window 3w)
The capturing part 2 is preferably formed of a transparent material for the entire body part 3. When the whole main body 3 is formed of a transparent material, the situation in the hollow space 3h can be confirmed from all directions. Then, even if bubbles or the like are attached to a part of the inner surface of the hollow space 3h, the situation inside the hollow space 3h can be confirmed, so that the inside situation can be surely and easily grasped. . On the other hand, the capturing part 2 may be formed of a material having high durability and the like, and a transmission window 3w that can confirm the situation inside the hollow space 3h from the outside may be provided in part.

  Moreover, the main-body part 3 may be formed so that the inside of the hollow space 3h cannot be visually recognized. In this case, if a sensor or the like for grasping the water level is provided in the hollow space 3h, the amount of air in the hollow space 3h can be grasped.

(About the hollow space 3h of the main body 3 of the capturing part 2)
In the capturing part 2, the axial length L and the cross-sectional area of the hollow space 3h of the main body part 3 are not particularly limited. It is determined as appropriate depending on the properties of the gas to be captured by the gas capturing device 1 of the present embodiment, the properties of the liquid that supplies the gas, the size of the container V that stores the liquid (that is, the size of the device having the container V), and the like. That's fine.

  And the cross-sectional shape of the hollow space 3h of the main-body part 3 is not specifically limited. For example, it may be circular or rectangular. However, in order to prevent bubbles from adhering to the inner surface of the space 3h, the cross-sectional shape of the hollow space 3h of the main body 3 is preferably circular.

  Note that if the cross-sectional area of the hollow space 3h of the main body 3 is small, bubbles generated in the hollow space 3h are likely to adhere to the inner surface of the space 3h. In this case, an appropriate amount of gas cannot be accommodated in the hollow space 3h, and it becomes difficult to confirm the amount of gas in the hollow space 3h. Then, the amount of gas in the hollow space 3h cannot be accurately grasped, and it is difficult to confirm whether or not a predetermined amount of air is accommodated in the hollow space 3h. For example, when the air trapping speed Jg in a flotation machine, which will be described later, is grasped by the gas trapping apparatus 1 of the present embodiment, the air inflow speed Jg may not be accurately grasped. Therefore, it is desirable that the cross-sectional area of the hollow space 3h of the main body 3 is sufficiently large with respect to the bubble diameter generated in the gas. For example, when the air inflow speed Jg in a flotation machine that performs flotation such as copper sulfide mineral is grasped and the cross-sectional shape of the hollow space 3h of the main body 3 is circular, the inner diameter (diameter) thereof. Is preferably about 8 to 10 mm.

  In the above example, the case where the hollow space 3h of the main body 3 has the same cross-sectional shape and the same cross-sectional area from the opening 3s provided at one end of the main body 3 to the other end has been described. Such a shape is preferable in that the volume of the gas A trapped in the hollow space 3h that satisfies the hollow space 3h can be easily obtained.

(Replacement of capture unit 2)
As described above, the main body 3 of the capturing unit 2 has the property of the gas captured by the gas capturing device 1 of the present embodiment, the property of the liquid that supplies the gas, and the size of the container V that stores the liquid (that is, It is desirable to use a device suitable for the size of the apparatus having such a container V). On the other hand, the communication blocking unit 10 can often be used even if the properties of the gas change. Therefore, it is desirable that the communication blocking unit 10 be detachable from the capturing unit 2. In this case, if the capture unit 2 is replaced, the gas can be captured using the capture unit 2 suitable for the conditions for capturing the gas. That is, if the capture unit 2 suitable for a plurality of conditions is provided, the gas capture device 1 of the present embodiment can be used under a plurality of conditions, so the versatility of the gas capture device 1 of the present embodiment is high. Become.

(About the scale)
The method of providing the scale 3m on the main body 3 of the capturing unit 2 (or the transmission window 3w when the transmission window 3w is provided) is not particularly limited. For example, a commercially available measure or the like may be attached to the outer surface or the inner surface of the main body 3 of the capturing unit 2, or the scale 3 m may be directly cut into the outer surface or the inner surface of the capturing unit 2.

  The interval of the scale 3m is not particularly limited, and may be set to an appropriate interval according to the property of the gas to be captured, the property of the liquid that supplies the gas, the amount of gas accommodated in the hollow space 3h, and the like.

  The standard for providing the scale 3 m is not particularly limited. If one end edge of the main body 3 of the capturing unit 2 (that is, the end surface where the opening 3s is formed, the lower end edge in FIG. 1A) is used as a reference, the position where the gas A fills in the main body 3 can be easily read.

  The range in which the scale 3m is provided is not particularly limited, and may be provided on a part of the main body 3 of the capturing unit 2 or may be provided over the entire length of the main body 3 of the capturing unit 2. If it is provided over the entire length of the main body 3 of the capturing part 2, it is preferable in that the maximum volume of the main body 3 can be used effectively and measured, so that the amount of the captured gas A can be measured even in a place with a large flow rate.

(About the pump means 13)
The pump means 13 only needs to have both the suction function and the fluid supply function, and is not limited to the roller pump described above. Moreover, it is good also as a pump means 13 by providing both the pump which has a suction function, and the pump which has a fluid supply function.

The pump means 13 does not necessarily have both the suction function and the fluid supply function. For example, a pump having only a suction function may be used as the pump means 13, or a pump having only a fluid supply function may be used as the pump means 13. For example, a magnet pump or a vacuum pump can be used as a pump having only a suction function. Moreover, a hose pump etc. can be used as a pump which has only a fluid supply function.
In addition, the pump means 13 can also use syringes, such as a syringe, other than what is called a pump. Even when syringes are employed as the pump means 13, the pump means 13 can have only both a suction function and a fluid supply function (or one).

(About valve 11)
In the above example, a case where a three-way valve is used as the valve 11 has been described. However, a two-way valve may be used, and when the pump means 13 functions as a valve, the valve 11 may not be provided. .

  However, when a three-way valve is used as the valve 11, the nozzle 11 b and the communication passage 4 h are communicated during a period in which the gas A is not captured after the gas capturing device 1 of this embodiment is immersed in the liquid L. . Then, even if the gas A enters the hollow space 3 h of the main body 3, the gas A can be extracted from the hollow space 3 h of the main body 3. For example, when capturing air in order to measure the air inflow speed Jg in flotation, it is necessary to start measurement after the slurry flow is stabilized. If air is extracted from the nozzle 11b, air capture can be started after the slurry flow is stabilized. Then, the air inflow speed Jg can be accurately calculated from the trapped air amount. Of course, in this case, it is necessary to feed the liquid L by the pump means 13 and fill the pipe with the liquid L before starting to capture air.

  The valve 11 to be used may be a manually operated valve or an electromagnetic valve. When the electromagnetic valve is used, it is possible to automatically perform continuous measurement by interlocking with the pump means 13.

  The material of the valve 11 is not particularly limited, but a material that can withstand damage caused by the properties of the liquid L and the like is preferable.

(Use in a flotation machine)
If the gas trapping apparatus 1 of the present embodiment described above is used as a device for trapping air in order to obtain the air inflow speed Jg in the flotation machine, this air can be trapped accurately and continuously. Therefore, if the gas trapping apparatus 1 of the present embodiment is used, the air inflow speed Jg in the flotation machine can be obtained accurately and continuously. And if the outer diameter of the main-body part 3 is made thin, since the front-end | tip of the main-body part 3 will become thin, the gas trapping apparatus 1 of this embodiment can be installed also in a narrow place. With this configuration, it is possible to measure the air inflow speed Jg even with a small flotation machine by the gas trapping device 1 of the present embodiment.

  In this specification, “capture continuously” means that when capturing gas at a certain time interval, the capture interval is short, and the gas is captured completely continuously in time. It does not mean. For example, in the case of a general flotation machine that performs flotation continuously, the time interval from capturing air to capturing the next air may be 1 to 5 minutes. Corresponds to “capture”.

In the gas trapping apparatus of the present embodiment, when air is trapped, the air inflow speed Jg can be calculated using the following equation.

Jg = V / (S × t)

V: Amount of air stored in the hollow space 3h of the capture unit 2 S: Cross-sectional area of the hollow space 3h of the capture unit 2 t: Until a certain volume of air accumulates in the hollow space 3h of the capture unit 2 time of

  It was confirmed that the air inflow rate in flotation could be measured with high accuracy by capturing air with the gas trapping device of the present invention.

  In the experiment, air was blown into the slurry contained in a 100 liter stainless steel tank by an air pump (1.5 kW), floated using a known method, copper concentrate and other gangue components Separated. In this flotation, air rising in the slurry was captured by the gas trapping device of the present invention.

Then, the amount of air blown into the slurry is changed between 0.4 to 0.8 m ³ / h until the air amount (capture air amount) measured by the gas trapping device of the present invention becomes a constant amount. It was confirmed whether or not the time varied depending on the amount of air blown into the slurry. Further, it was confirmed whether or not the air inflow velocity Jg calculated from the time until the trapped air amount becomes a constant amount is accurate.
Whether or not the air inflow velocity Jg calculated from the time until the trapped air amount reaches a certain amount is accurate is determined based on variations in measured values when measured a plurality of times under the same conditions. . Specifically, the air inflow velocity Jg was measured at different positions under the same conditions, and a determination was made based on whether the obtained measured value was stable or almost constant.

The slurry used in the experiment was formed by the following method.
First, using a ball mill, Australian copper ore was pulverized at P80 to 20 μm to form a pulverized product. This pulverized product was mixed with water so as to have a concentration of 0.2 t / m ³ to form a slurry. In addition, “it becomes 20 μm at P80” means that in the pulverized pulverized product, the mass ratio of particles of 20 μm or less is 80% or more of the total mass of the pulverized product.

A collecting agent (AP208 manufactured by Cytec Industries Inc.) and a foaming agent (methyl isobutyl carbinol (MIBC) (C ₆ H ₁₄ O) manufactured by Wako Pure Chemical Industries, Ltd.) were added to the slurry. The collector and the foaming agent were added in an amount of 200 g for the collection agent and 50 g for the foaming agent per ton of the pulverized product.

The apparatus used for the experiment is the apparatus shown in FIG.
A transparent PVC pipe having a circular cross section with a diameter (inner diameter) of 34 mm was used for the capturing part. The capturing part had a total length of 700 mm, and the length of the scaled part was 700 mm.
A valve (a three-way valve made of fluororesin) was attached to one end of the PVC pipe of the capturing part so as to be airtight and liquidtight. And the rubber tube (length 1500mm) with an internal diameter of 8 mm was connected to the nozzle of the valve | bulb upper end.
A roller pump for physical and chemical use (manufactured by Cole-Parmer Instrument Company) was connected to the tip of the rubber tube.

The above-described apparatus was subjected to a leak test before this experiment.
The leak test was performed by the following method.
First, the capturing part was fixed so that the lower end was immersed in a tank filled with water. In that state, air was flowed into the trapping part, and the air layer in the trapping part was set to a certain height, and then the trapping part was left still for 1 hour in that state. As a result, the amount of change in the height of the air layer in the capturing part was 1 mm or less.
In this experiment described below, the experiment was performed with the apparatus immersed in slurry for about 1 hour. From the result of the leak test, it was determined that the apparatus used in the experiment did not cause air leakage during the experiment.

  This experiment was performed by the following method.

  First, with the valve of the capturing part closed, the end of the capturing part (the end where no valve is provided) was immersed in the slurry accommodated in the container. At this time, air is not supplied from the air pump to the slurry.

  Next, the valve is opened to fill the trapping portion with slurry. Specifically, the roller pump was operated in a state where the valve was operated to communicate the inside of the capturing unit with the roller pump. And the air and slurry in a trap part were sucked, and the trap part was filled with slurry.

  When the trapping portion was filled with the slurry, the valve was closed, and then the air pump was operated to supply air to the slurry.

When air is supplied to the slurry, the slurry and the air flow into the trapping part, so the scale of the trapping part is checked and the time until the air fills the section of a certain volume is measured. That is, the time until a certain amount of air (2 × 10 ⁵ mm ³ ) enters the capturing part was measured. And from the measured time, the value of the air inflow velocity Jg was calculated using the following formula.

The value of the air inflow speed Jg when the air blowing amount was changed by the above method was as follows.

Air blowing amount: 0.4 to 0.8 m ³ / h
Time for air to fill a certain volume section: 20s
Calculated air inflow velocity Jg: 6 × 10 ^{−3 to} 1.3 × 10 ⁻² m / s

Specifically, when the air blowing rate is 0.4 m ³ / h, the air inflow rate Jg is 6 × 10 ⁻³ m / s, and when the air blowing rate is 0.8 m ³ / h, the air inflow rate Jg is 1. It was 3 × 10 ⁻² m / s.
That is, it was confirmed that when the air blowing amount was changed between 0.4 to 0.8 m ³ / h, the calculated air inflow speed Jg changed according to the increase or decrease of the air blowing amount.
It was also confirmed from the measurement at a plurality of locations that the air inflow velocity Jg calculated by the above method was accurate.

  From the above results, it was confirmed that the gas trapping apparatus of the present invention can trap the gas supplied to the liquid and can accurately grasp the amount of the trapped gas. And it was confirmed that if the air supplied to the slurry is trapped by the gas trapping apparatus of the present invention, the air inflow velocity Jg which is an important parameter in the flotation can be calculated accurately.

  The gas trapping device of the present invention is suitable for measurement of a gas flow rate supplied to a liquid and measurement of a gas flow rate in a slurry.

DESCRIPTION OF SYMBOLS 1 Gas capture device 2 Capture part 3 Main body part 3s Opening 3w Transmission window 10 Communication interruption | blocking part 11 Valve | bulb 11a Nozzle 11b Nozzle 11c Nozzle 12 Tube 13 Pump means

Claims (6)

A gas trapping device used for measuring the air inflow rate of air flowing into the slurry, comprising a trapping unit that traps the gas that is immersed in the slurry in the flotation and supplied to the slurry,
The capturing part is
Formed in a hollow structure having a hollow space continuous from an opening formed at one end, and having a communication passage communicating between the hollow space and the other end,
A communication blocking unit having a function of blocking communication between the communication path of the capturing unit and the outside;
The communication blocker is
A gas trapping device comprising a pump means having a fluid supply function for supplying a slurry for preventing gas from entering the hollow space of the trapping portion into the hollow space of the trapping portion . A gas trapping device comprising a trapping part that is immersed in a fluid to which gas is continuously supplied and traps the gas supplied to the fluid ,
The capturing part is
Formed in a hollow structure having a hollow space continuous from an opening formed at one end, and having a communication passage communicating between the hollow space and the other end,
A communication blocking unit having a function of blocking communication between the communication path of the capturing unit and the outside;
The communication blocker is
A gas trapping device comprising a pump means having a fluid supply function for supplying a fluid for preventing gas from entering the hollow space of the trapping portion into the hollow space of the trapping portion . The communication blocker is
The gas trapping device according to claim 1 or 2, further comprising pump means having a suction function for sucking a fluid in a hollow space of the trapping section. The communication blocker is
A tube communicating the communication passage and the pump means;
A three-way valve provided between the tube and the communication passage or between the tube and the pump means,
4. The gas trapping device according to claim 1, wherein one nozzle of the three-way valve is open to the atmosphere. The communication blocker is
The gas trapping device according to claim 1, wherein the gas trapping device is detachably connected to the trapping unit. The capturing part is
6. The gas trapping device according to claim 1, wherein the gas trapping device has a structure that allows the inside of the hollow space to be visually recognized from the outside.

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