JP2748828B2 - Peeling accelerator and briquette manufacturing method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peeling promoting material used in producing briquettes by using reduced iron obtained in a reduction step in a direct iron making method as a material and compressing the reduced iron. The present invention also relates to a briquette manufacturing method devising a method for using the peeling accelerator.

[0002]

2. Description of the Related Art In the case of producing reduced iron by the direct reduction iron making method, iron ore is charged into a reduction furnace, and usually at 750 ° C to 9 ° C.
It is manufactured by contacting a reducing gas containing hydrogen and carbon monoxide as main components at a high temperature of 50 ° C.

[0003] When the reduced iron produced by the direct reduction method comes into contact with the outside air at a high temperature near the above-mentioned reduction temperature, it generates instantaneously high heat and is oxidized. Or, by forming into a briquette shape in a state where the contact with the outside air is cut off, the surface area is reduced, thereby suppressing the inconvenience due to the contact with the outside air. For example, in the former case, the reduced iron generated in the above-mentioned reduction furnace is taken out as a product after being cooled by an inert cooling gas circulating in the same reduction furnace. In the latter case, the produced reduced iron is sent to a briquette manufacturing apparatus at a high temperature, where it is formed into a briquette form, cooled with air or water, and taken out as a product.

FIG. 4 is a sectional view showing a compression molding apparatus for producing briquettes. In the figure, reference numerals 7 and 8 denote forming rolls, and the forming rolls 7 and 8 are opposed to each other while being pressed against each other at a constant pressure. Reference numeral 2 denotes a screw feeder in which the reduced iron 5 sent from the reduction furnace is charged and filled. Reference numeral 6 denotes a rotating machine to which the shaft 4 is vertically connected. Reference numeral 3 denotes a screw spirally mounted on the shaft 4. Reference numeral 9 denotes a strand in which briquettes are arranged in a strip shape, and reference numeral 13 denotes briquettes cut individually. 12 is a strand shoe for guiding the strand 9, 11 is a separator, and 10 is a hammer-like projection attached to the separator 11.

FIG. 5 is a perspective view showing an example of the surface of the molding die of the rolls 7 and 8 shown in FIG. In the figure, reference numeral 21 denotes a roll pocket, which is a rectangular recess provided on the surface of a mold. 22 and 23 are land areas, 2 roll pockets
The hills around 1 are shown. Next, a method of manufacturing briquettes will be described.

The reduced iron 5 discharged from the reduction furnace and supplied to the screw feeder 2 from the charging port 1 without contacting the outside air depends on the operation system of the reduction furnace. Is up to 30mm, average 8mm ~ 20mm,
Sponge-like reduced iron at a temperature of 650 ° C to 750 ° C.
The sponge-like reduced iron 5 is pressure-fed downward by the screw 3 and is introduced into a space between the rolls 7 and 8 rotating at the same direction and at the same speed as the flow of the reduced iron 5.

The rolls 7 and 8 are at a high temperature (650 to 750 ° C.)
Is heated by contact with reduced iron 5, but is cooled by cooling water from the inside, and its surface temperature is generally 300 ° C.
~ 450 ° C. Roll pockets 21 of the same size are formed on the surfaces of the molds of the rolls 7 and 8 (see FIG. 5).
Are provided in the same arrangement, and the roll rotation timing is adjusted so that the geometric positions of the two rolls are opposite to each other.

The sponge-like reduced iron 5 comprises two rolls 7, 8
While being compressed into a briquette shape corresponding to the shape of the cavity of the roll pocket 21 formed therebetween, the adjacent briquettes are separated from the rolls 7 and 8 in the form of strands 9 in series. The strand 9 is guided by the strand shoe 12 and slides down, and the separator 11 rotates and the projection 10 hits the strand 9, so that the thin land area 2 is formed.
The briquettes 13 are separated into individual briquettes 13 so that the portions 2 and 23 are bent.

[0009]

The conventional briquette production is performed as described above. However, the strand released from the compression may not be easily separated from the surface of the rotating roll. Is not well guided to the strand shoe, and therefore the separation into the independent briquette by the separator does not work well.Moreover, the strand comes off from the strand shoe, causing clogging between the separator and the strand shoe, and sometimes the strand from the roll. However, there was a problem that the film was not peeled off at all and rotated together with one of the rolls while being in close contact with either one of the rolls. In such a case, the operation of the briquette manufacturing apparatus has to be stopped to remove the clogged strand or to clean the roll pocket. Therefore, the present inventors have conducted various studies on the assumption that the above-mentioned peeling can be surely performed if a lubricant is adhered to the surface of the mold of the roll.

Conventionally, coal powder, chemical fertilizer, metal powder,
When producing briquettes by compression molding of ore powder,
Water, talc, lubricating oil, glycerin, magnesium stearate, molybdenum disulfide, silicone resin, ethylene glycol, graphite, paraffin, etc. are used as external lubricants to reduce the frictional resistance between the raw material powder and the roll surface. ing.

However, it has been found that the above-mentioned conventional lubricant cannot provide a suitable effect for use in producing briquettes of reduced iron at high temperatures. In other words, in the case of briquette production of reduced iron, since the surface temperature of the roll reaches 450 ° C.,
The lubricant must be one that does not evaporate or decompose at the above-mentioned temperature (450 ° C.) and that adheres and remains efficiently on the roll surface, but the above-mentioned conventional lubricant does not satisfy these conditions, It was inappropriate.

For example, as a test on graphite, graphite at room temperature was suspended in a water or petroleum fraction, and the suspension was sprayed onto the surfaces of the molds of the rolls 7 and 8 to produce briquettes of reduced iron. As a result, the following problems became apparent. That is, when graphite is used, it is difficult to uniformly suspend graphite powder in water or oil. In addition, the graphite itself often causes clogging at the injection port or the pipe valve. In addition, water or oil in the suspending medium evaporates on the surface of the roll, and a part of the graphite is separated from the surface of the roll together with the vapor, and the residual graphite after evaporation becomes a dry powder state and the yield is poor. there were. In addition, graphite is expensive, so that there is a problem that operation costs are high.

The present invention has been made in order to solve the above-mentioned problems, and has as its object to provide a peeling promoting material for allowing briquette strands to be smoothly peeled off from a roll. Another object of the present invention is to provide a method for stably and favorably producing briquettes by using the peeling promoting material in a briquette producing apparatus.

[0014]

The peeling accelerating material according to the present invention is used for producing briquettes by compression molding reduced iron.
It is to be adhered to the surface of a mold, and the following (1) to
(6).

(1) Petroleum asphalt or petroleum pitch. (2) Distillation residue containing petroleum asphalt or petroleum pitch in the middle stage of petroleum refining process. (3) A liquid mixture obtained by dissolving and dispersing the petroleum asphalt or petroleum pitch or the distillation residue oil in a liquid petroleum fraction. (4) Asphalt emulsion obtained by suspending or emulsifying the above petroleum asphalt or petroleum pitch in water. (5) Asphalt emulsion obtained by suspending or emulsifying the above distillation residue oil in water. (6) Asphalt emulsion in which the above liquid mixture is suspended or emulsified in water.

The petroleum asphalt or petroleum pitch (hereinafter, may be simply referred to as asphalt), which is a main component of the peeling accelerator, contains petroleum asphalt specified in JIS K 2207 and has a softening point of 0 ° C. to 150 ° C. Within the range, or 0.1 mm penetration at 25 ° C is 0
As described above, those having a value within 300 are mainly cited.

The above-mentioned distillation residue oil flows out of a petroleum refining unit as a residue in the middle of refining raw petroleum, and preferably has a content of petroleum asphalt or petroleum pitch of 20% by weight or more.

The liquid mixture is obtained by cutting back the asphalt or the distillation residue oil with a liquid petroleum fraction such as gasoline, kerosene, light oil, lubricating oil, etc. The content of petroleum asphalt or petroleum pitch is 20 wt% or more. Preferably, there is.

The above-mentioned asphalt emulsion is obtained by emulsifying and suspending the above-mentioned asphalt, the above-mentioned distillation residue oil or the above-mentioned liquid mixture in water using an emulsifier such as a caotin emulsifier, an anionic emulsifier or a nonionic emulsifier. In this case, the asphalt content is preferably 2% by weight or more.

Further, the method for producing briquettes according to the present invention comprises:
The above-mentioned peeling accelerator is heated and melted and sprayed and adhered to the surface of the molding die of the compression molding apparatus, or the solid peeling accelerator is made into powder and the powder is adhered to the surface of the molding die by gravity or gas flow. Alternatively, a liquid release accelerating material is sprayed and adhered to the surface of the mold. Further, the amount of the release accelerating material is converted into petroleum asphalt or petroleum pitch contained in the release accelerating material, and is 0.01 g or more per hour and 1.0 g per 1 cm ² of the surface area of the mold portion of the mold.
It is preferable to set the following.

[0021]

[Action] The action of asphalt, which is a main component of the peeling accelerator, will be described. During the production of briquettes, the temperature of the surface of the mold of the compression molding apparatus, that is, the surface of the roll, is usually 300 to 4
Although it has reached 50 ° C., asphalt hardly evaporates at this temperature, so it remains.

When the rolls 7 and 8 rotate and the asphalt adhering to the roll surface comes into contact with the reduced iron 5 at 650 to 750 ° C. (see FIG. 4), the heat causes the asphalt to generate hydrocarbon gas. And pyrolyze into carbon. In the stage where the reduced iron 5 is compressed between the two rolls 7 and 8 and formed into a briquette mold, the generated hydrocarbon gas forms a thin gas boundary film between the roll pocket surface and the briquette, In addition, carbon remains on the surface of the roll pocket and serves as a lubricant for reducing frictional force generated on the surface of the roll pocket during briquette molding. By these two actions, the briquette strand 9 can be peeled off the rolls 7 and 8 well.

In the conventional briquette manufacturing process,
There is a problem that fine powder of reduced iron easily adheres to the roll pockets, forms scales, forms a thin layer on the surface of the roll pockets, and grows gradually. This scale is sintered porous and the pressure between the rolls as the briquettes are formed causes the briquettes to adhere to the surface of the roll pockets and prevents the briquettes from slipping out of the roll pockets smoothly. Therefore, conventionally, it was necessary to periodically stop the operation to remove the scale.

However, when the release accelerating material of the present invention is adhered to the surface of the roll pocket, the carbon generated by thermal decomposition fills the space of the sintered porous material even if the scale is adhered. Transforms the scale tightly. It is considered that this scale is repeatedly cooled and heated by rotation of the roll, and peels off from the roll surface due to expansion and contraction at that time. Therefore, in the present invention, the scale is peeled off and the roll pocket is always kept clean.

When graphite is used as a release agent instead of asphalt, a method of attaching to a roll is as follows.
A method may be employed in which graphite is pulverized into a powder to adhere by gravity or gas flow. However, this powder is lossy due to lack of adhesion. On the other hand, a method in which graphite powder is suspended in water or oil and sprayed on a roll with a sprayer can also be adopted, but even in this case, the water or oil evaporates at the moment of spraying on the roll surface and the graphite is dried. However, the loss increases as described above.

However, the asphalt, which is the main component of the release accelerating material of the present invention, has a temperature condition of the roll surface, ie, 300 to 4
Since it is a liquid at 50 ° C., it has good affinity with the roll pocket surface, adheres effectively, and has little loss.

Next, a description will be given of the peeling accelerator for the liquid mixture and the distillation residue oil. When petroleum asphalt or petroleum pitch, which is the main component, is used as it is, it cannot be sprayed as it is because it is a solid at room temperature, so it must be heated and dissolved or pulverized.
Therefore, if the asphalt is cut back with a liquid petroleum fraction to give fluidity, a liquid mixture that is liquid at room temperature can be directly sprayed at room temperature.

When the liquid petroleum fraction to be added is sprayed on the roll surface, the heat of the roll turns into oil fumes and separates from the roll surface. The fumes deteriorate the working environment near the briquetting machine. It is sufficient that the liquid petroleum fraction is added as long as the asphalt can be fluidized to form an easy-to-handle state, and a smaller liquid petroleum fraction is more economically advantageous. As a liquid petroleum fraction for cutback, a relatively high-viscosity one can be used. In consideration of the amount added in this case, in order to ensure sufficient fluidity, an asphalt content of 20 wt% or more is appropriate. it is conceivable that.

For example, when kerosene or gas oil having a low viscosity is used as the liquid petroleum fraction, even if it is added so that the asphalt content becomes 80 to 70%, it is sufficiently fluidized and handling becomes easy.

The distillation residue oil contains a low-viscosity liquid petroleum fraction in addition to the asphalt, and is in a fluid state at normal temperature. Also in this case, spray adhesion can be performed at room temperature as it is, and in this case, there is no need for the trouble of cutting back. In addition, in terms of price, the distillation residue oil is less expensive than asphalt cutback with other liquid petroleum fractions as compared with asphalt standards, and there is no cost for cutback, It is economical.

If the distillation residue oil has a high viscosity and a good spray cannot be obtained with a sprayer, it is advisable to warm it up a little or cut it back with a small amount of another liquid petroleum fraction. The asphalt content of the distillation residue oil or the liquid mixture obtained by cutting back the distillation residue oil is suitably 20% by weight or more as described above.

Next, the peeling accelerator for asphalt emulsion will be described. In the case of the distillation residue oil and the liquid mixture, most of the petroleum fractions other than the asphalt component contained therein are components having a boiling point equal to or lower than the temperature of the roll surface, and thus were sprayed on the roll surface as described above. When it evaporates almost instantaneously, it separates from asphalt components and generates oil vapor. This oil vapor harms the environment of the production site, and also has a problem that it takes time to remove the dust because it condenses in a low temperature part of the apparatus and promotes the adhesion and deposition of dust there.

However, in the case of an asphalt emulsion, water is used for fluidizing or adjusting the viscosity of the asphalt, and thus there is no problem as described above. That is, when the asphalt emulsion is sprayed onto a roll by a sprayer, moisture is instantaneously evaporated by the heat of the roll, but such water vapor does not harm the environment. Moreover, since water is inexpensive, even if it is used in a large amount, the economic efficiency does not deteriorate. Further, when an asphalt emulsion is used, there is also an effect of cooling the roll by latent heat of evaporation of water. The asphalt remaining after the water evaporates acts as described above to facilitate briquette peeling from the roll.

Even a considerably diluted asphalt emulsion exerts a sufficient peeling promoting effect, and has no inconvenience as in the case of the liquid mixture and the distillation residue oil. Therefore, the asphalt content of the asphalt emulsion is further reduced to 2 wt. % Or more. In addition, water and asphalt are not mixed only by simply mixing, but when asphalt is divided into particles of several tens of microns or less by an emulsifier, it can be dispersed in water by the action of an emulsifier and can be used.

Since asphalt is a solid at ordinary temperature, it cannot be emulsified by an emulsifier unless it is heated to a fluid state. However, among the above-mentioned distillation residue oil or the above-mentioned liquid mixture which is in a fluid state at ordinary temperature, those having a small oil fraction content If used, it is possible to emulsify at room temperature while minimizing the generation of oil vapor. Incidentally, petroleum asphalt or petroleum pitch, which is a main component of the peeling accelerator, is commercially available for road pavement, waterproofing, and electrical insulation, and is easily available and inexpensive.

Next, a briquette manufacturing method will be described. When the release promoting material is a solid or a highly viscous liquid, it is preferable that the release promoting material is heated and melted at a temperature equal to or higher than the pour point to give sufficient fluidity and spray-adhered to the surface of a mold (roll surface). Alternatively, when the release accelerating material is a solid, it can be pulverized, and the powder can be scattered on the roll surface by gravity or gas flow to be melted and adhered by the heat of the roll surface.

In the case of the above-mentioned heating, a heating device is required for all of the spraying devices such as asphalt storage equipment and piping equipment. In addition, in the case of the above powder, it is difficult to efficiently attach and melt the asphalt powder to the roll surface because the asphalt crushing equipment is expensive and the powder is softened when the temperature in the vicinity is high. There is. On the other hand, among the release promoting materials, those which are liquid at room temperature do not have such a problem, and can be adhered to the roll surface by directly spraying through a sprayer. The briquette is easily peeled off from the roll pocket by the action of the above-mentioned peeling promoting material.

If the amount of asphalt, which is a main component in the release accelerating material, on the surface of the roll is set to 0.01 g or more per hour per 1 cm ² of the surface area of the mold, that is, the roll pocket, This is because a sufficient peeling effect does not appear. The reason why the amount of adhesion is set to 1.0 g / hour or less is that if it exceeds this, there is a problem that the peeling promoting material is burned and smoke is generated, which hinders the operation of the entire compression molding apparatus.

[0039]

【Example】

Embodiment 1 FIG. 1 is a schematic view showing a manufacturing apparatus used for a briquette manufacturing method according to an embodiment of the present invention. In the figure, reference numeral 113 denotes a briquette molding machine, and 114 and 115 denote sprayers for jetting a peeling promoting material onto the rolls 7 and 8, respectively. 108 is a tank for holding a peeling accelerator, and 110 is a tank 1
08, a heating coil for heating the peeling accelerator in 10
9 is a tube for introducing an inert gas, 111 and 112 are tubes for sending a peeling promoting material from the tank 108 to the sprayers 114 and 115 for rolls, and 118 and 119 are tubes 111 and 1 respectively.
12 and a heating coil for heating the atomizers 114 and 115. The diameter of each of the rolls 7 and 8 used was 1
It was 000 mm wide and 270 mm wide, and rotated about 15 times per minute. Next, the operation of the briquette manufacturing equipment will be described.

[0040] Straight asphalt 60/80 (equivalent to JIS K2207), which is a peeling promoting material, was put into the tank 108, and was heated to 150 ° C by the heating coil 110 and melted. Introduce an inert gas from pipe 109 to fill tank 5kg
/ Cm ² . The molten asphalt in the tank 108 is supplied to the sprayers 114 and 115 through the pipes 111 and 112 by the pressure in the tank. Tubes 111, 11
2. The sprayers 114 and 115 were maintained at about 150 ° C. by the heating coils 118 and 119 so that the molten asphalt inside did not solidify. The spray amounts from the roll sprayers 114 and 115 to the surfaces of the rolls 7 and 8 were adjusted to be substantially the same. In this manner, the briquette molding machine 113 was operated in the same manner as in the prior art while producing the briquettes while spraying the release accelerating material onto the rolls 7 and 8. This operation was performed continuously for 96 hours. The total injection amount of the molten asphalt during this time was measured by the decrease in the liquid level of the molten asphalt in the tank 108. As a result, the average injection amount for 96 hours was 1 cm on the roll surface.
^The weight was 0.05 g / hour.

During the 96-hour operation in which the molten asphalt injection was performed, the briquette strand could be smoothly separated from the rolls 7 and 8, and the briquette molding machine 113 was operated stably without having to stop once. .

When the surface condition of the rolls 7 and 8 after the operation for 96 hours was observed, the scale of the surface of the roll pocket was almost completely absent. A peeled scale was observed at the bottom of the apparatus. On the other hand, when a briquette is manufactured without using a peeling accelerator as in the past, on the roll surface,
Scale had been deposited.

<Embodiment 2> FIG. 2 is a schematic view showing an apparatus for manufacturing a briquette according to another embodiment of the present invention. In the figure, the parts given the same reference numerals as those in FIG. 1 indicate the same or equivalent parts as those in FIG. The heating coil 103 is a tank containing light oil, which is a liquid oil fraction. Reference numeral 104 denotes an emulsifier, which takes in the molten asphalt in the tank 101 and the light oil in the tank 103 from the tubes 105 and 106 and mixes them. Reference numeral 120 denotes a heating coil for preventing asphalt in the tube 105 from solidifying. 107
Is a pipe connecting the emulsifier 104 with the tank 108 in which the peeling accelerator is placed.

Next, the driving operation will be described. Vessel 101
To straight asphalt 60/80 (JIS K-2
207 equivalent), and 150
Heated to ° C. and melted. Also, light oil (JIS K
2204 light oil No. 1). Tubes 105, 10
From No. 6, the molten asphalt and light oil were supplied to the emulsifier 104 while adjusting the flow rate so that the volume ratio became 2: 1. After mixing well, the mixture was stored in the tank 108 through the pipe 107. Since the mixture of asphalt and light oil stored in the tank 108, that is, the peeling accelerator is liquid at room temperature, a heating coil is not required for the subsequent device. Next, as in the above embodiment, an inert gas was introduced from the pipe 109 to fill the tank 108 with 5 kg.
/ Cm ² , and the liquid mixture in the tank 108 is
8 was injected.

In this manner, briquettes were produced continuously for one week while the liquid mixture (peeling accelerator) was sprayed onto the rolls 7 and 8. The average weekly injection volume of the mixture is
The volume was 0.15 cc / cm ² per 1 cm ^{2 of the} roll surface, which was 0.1 g / hr in terms of the main component asphalt.

During the one-week period of the injection of the liquid mixture (peeling accelerator), the briquette strand is separated from the roll smoothly, and the briquette molding machine is stopped once due to the briquette strand not separating smoothly from the roll. No problems occurred, and stable operation was possible. Incidentally, the mixing ratio of the liquid mixture may be such that the liquid mixture is mixed with light oil at various ratios as long as the content of asphalt as a main component is 20 wt% or more.

<Embodiment 3> FIG. 3 is a schematic view showing a part of a briquette manufacturing apparatus according to a third embodiment. In the figure, the parts given the same reference numerals as those in FIG. 1 indicate the same or corresponding parts as in FIG. Distillation residue oil is used as a peeling accelerator in the tank 108. The distillation residue oil is a residue oil obtained from a petroleum separation / refining unit, containing 45% by volume of asphalt as a main component, and having a pour point of 15 ° C. or lower.

The distillation residue oil charged in the tank 108 was heated to 80 ° C. by the heating coil 110 to lower the viscosity and improve the fluidity. Next, in the same manner as in Example 2, the tank 108 was pressurized to 5 kg / cm ² with an inert gas from the pipe 109, and the briquettes were continuously manufactured for 72 hours while spraying the surfaces of the rolls 7 and 8 for ^two hours. . The average spraying amount of this distillation residue oil for 72 hours is 0.35 cc / hr / cm ² of the roll surface.
When converted to the main component asphalt, 0.1 hour
6 g.

During the spraying of the distillation residue oil (peeling accelerator) (72 hours), the surface of the roll pocket is kept clean, the briquette strand is separated smoothly from the roll, and the briquette strand does not peel off from the roll surface. There was no stoppage of the briquette molding machine 113, and the operation of the briquette manufacturing apparatus could be stably performed. If the distillation residue oil has sufficient fluidity, the heating coil 1
10 may not be necessary.

Example 4 Briquettes were manufactured using the same briquette manufacturing equipment as in FIG. However, tank 10
The inside of No. 3 was not water but light water to which an emulsifier was added.

In the tank 101, straight asphalt 60 /
80 (equivalent to JIS K 2207), and the mixture was heated to 150 ° C. by the heating coil 102 and melted. Tank 10
Water was added to 3 and a nonionic liquid emulsifier was added at 5 wt% to water and mixed well. Tubes 105, 106
And water containing an emulsifier are supplied to the emulsifier 104 while controlling the flow rate so that the respective volume ratios become 3 to 7, and the asphalt is well emulsified into an asphalt emulsion. Stored in tank 108.

Then, as in Examples 2 and 3, an inert gas was introduced from the pipe 109 to pressurize the tank 108 to 5 kg / cm ² , and the asphalt emulsion in the tank 108 was rolled on the rolls 7 and 8 of the briquetting machine 113. Sprayed. Also in the case of the fourth embodiment, since the asphalt emulsion which is a peeling accelerator is a liquid, the tank 108, the pipes 111 and 112, the sprayers 114 and 1 are used.
15 does not require a heating coil.

In this way, briquettes were produced continuously for one week while the asphalt emulsion was sprayed onto the rolls 7 and 8. The average spray amount per week of the asphalt emulsion was 0.20 cc / cm ² per 1 cm ² of the roll surface,
It was 0.06 g / hr in terms of asphalt as the main component.

During the one week asphalt emulsion jetting, the briquette strand could be smoothly separated from the roll, and no downtime of the briquette molding machine due to the briquette strand not separating smoothly from the roll occurred.

Further, in Example 2, since the mixed liquid of asphalt and light oil was sprayed on the roll surface, steam of light oil was generated. In the case of spraying the asphalt emulsion on the roll surface, such a steam was generated. No occurrence was observed. In the above asphalt emulsion, asphalt and water may be mixed at various ratios as long as the asphalt content of the main component is 2 wt% or more.

<Embodiment 5> In Embodiment 4 (see FIG. 2), straight asphalt was charged into the tank 101 and emulsified in water by the emulsifier 104. The liquid mixture was charged and emulsified in water. The liquid mixture is cutback asphalt with a cutback of about 20% by volume gas oil and a viscosity of about 250 cSt at 60 ° C. In this case, since the cutback asphalt has fluidity even at room temperature, the heating coil 1
02 and 120 are not required.

Water was placed in the tank 103, and a nonionic liquid emulsifier was added in an amount of 5% by weight to water and mixed well.
Through the pipes 105 and 106, cutback asphalt and water containing an emulsifier are supplied to the emulsifier 104 while controlling the flow rate so that each volume ratio becomes 1: 5, and emulsified to prepare an asphalt emulsion. , The tank 10 through the pipe 107
8. Since the asphalt emulsion stored in the tank 108 is a liquid having a low viscosity, it does not require heating by a heating coil. Next, in the same manner as in Examples 2 to 4, an inert gas was introduced from the pipe 109 to fill the tank 108 with 5 kg.
/ cm ² , and the briquette was continuously manufactured for 72 hours while spraying the asphalt emulsion in the tank 108 onto the rolls 7 and 8. The average spraying amount for 72 hours was 0.50 cc / h / cm ² of the roll surface, and was 0.07 g / h in terms of the main component asphalt. Also in the case of the fifth embodiment, the surface of the roll pocket is kept clean during the injection period, the briquette strand can be smoothly separated from the roll, and the stop of the briquette molding machine 113 due to the briquette strand not peeling off from the roll surface is prevented. Never occurred.

[0058]

As described above, according to the peeling accelerator of the present invention and the method for producing briquettes using the same, when producing briquettes of reduced iron, the briquette strands are smoothly peeled off from the surface of the roll, which is good for strand shoes. And the briquette production operation can be continuously and stably performed. In addition, there is also an effect that it is not necessary to stop the operation of the manufacturing apparatus and clean the roll pocket or the like in the middle as in the related art.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a manufacturing apparatus in a briquette manufacturing method according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a manufacturing apparatus in a briquette manufacturing method according to Embodiments 2, 4, and 5 of the present invention.

FIG. 3 is a schematic diagram illustrating a manufacturing apparatus in a briquette manufacturing method according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing a compression molding apparatus for producing briquettes.

FIG. 5 is a perspective view of a roll surface of the briquette manufacturing apparatus.

[Explanation of symbols]

 7, 8 Forming rolls 101, 103, 108 Bath 102, 110, 118, 119, 120 Heating coil 104 Emulsifier 105, 106, 107, 109, 111, 112 Tube 113 Briquette forming machine 114, 115 Sprayer for roll

────────────────────────────────────────────────── ─── Continuing on the front page (72) Osamu Tsushita 1-33-18 Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo Kobe Steel, Ltd. Kobe Head Office (72) Inventor Yutaka Inada Chuo-ku, Kobe-shi, Hyogo 1-318, Wakihamacho Kobe Steel, Ltd. Kobe Head Office (72) Inventor Tillingham Koomarasamie Venezuelan Province Bolivar Province Puerto Aldaz City Apartado 497 Operasion Al Sur del Orino Ko Campania (56) References 62-60245 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) C21B 13/00 C22B 1/14 C22B 1/244

Claims (5)

(57) [Claims] 1. A peeling promoting material to be attached to the surface of a mold when compression-molding reduced iron to produce briquettes, which is one of the following (1) to (6): A peeling promoting material characterized by the following. (1) Petroleum asphalt or petroleum pitch. (2) Distillation residue containing petroleum asphalt or petroleum pitch in the middle stage of petroleum refining process. (3) A liquid mixture obtained by dissolving and dispersing the petroleum asphalt or petroleum pitch or the distillation residue oil in a liquid petroleum fraction. (4) Asphalt emulsion obtained by suspending or emulsifying the above petroleum asphalt or petroleum pitch in water. (5) Asphalt emulsion obtained by suspending or emulsifying the above distillation residue oil in water. (6) Asphalt emulsion in which the above liquid mixture is suspended or emulsified in water. 2. A method for producing reduced iron briquettes using a compression molding apparatus, wherein the peeling accelerator according to claim 1 is heated and melted, and sprayed and adhered to the surface of a molding die of the compression molding apparatus. A method for producing briquettes, characterized in that: 3. A method for producing briquettes of reduced iron using a compression molding apparatus, wherein the solid exfoliation promoting material according to claim 1 is formed into a powder, and the powder is subjected to the compression molding by gravity or gas flow. A method for producing briquettes, comprising melting and attaching to a surface of a molding die of a mold device. 4. A method for producing reduced iron briquettes using a compression molding apparatus, wherein the liquid peeling accelerator according to claim 1 is sprayed and adhered to the surface of the molding die. Production method. 5. The briquette manufacturing method according to claim 2, wherein an amount of the peeling promoting material adhered to the petroleum contained in the peeling promoting material per 1 cm ² of the surface area of the mold portion of the mold. 0.01 g or more per hour in terms of asphalt or petroleum pitch.
A method for producing briquettes that is 0 g or less.