JP4406328B2 - Granulating treatment method of granulated blast furnace slag - Google Patents

Description

  The present invention relates to a granulating process for granulated blast furnace granulated slag rapidly cooled and solidified with water, and more specifically, blast furnace granulated slag is used as fine aggregate for concrete, mortar, block or the like or The present invention relates to a method for adjusting the particle size distribution and shape of granulated slag for use as artificial sand for seafood cultivation or leisure beaches.

  The molten blast furnace slag discharged together with the hot metal from the blast furnace is separated from the hot metal based on the density difference while flowing down the hot metal, and further separated from the hot metal by the skinmer provided in the hot metal, and the molten The blast furnace slag in a state flows down a slag dredging (referred to as “slag dredging”) and is discharged to a slag processing yard or a slag containing container. This blast furnace slag is treated by flowing molten blast furnace slag into a slag treatment yard and slowly cooling it (called “air-cooling method”), or by injecting, mixing and stirring a large amount of water into the molten blast furnace slag. A method of quenching by rapidly cooling or pouring molten blast furnace slag into a large amount of water (referred to as “water granulation method”) and a method of rapid cooling by blowing the molten blast furnace slag together with a gas such as air into the air (“ There are mainly three types of treatment methods known as “air crushing methods”.

  Among these, the blast furnace slag treated by the water granulation method is called blast furnace granulation slag, and this blast furnace granulation slag is granular glassy having a particle size of about 6 mm or less, and its physical properties are the properties of natural sand. At the same time, it has the property that the granulated blast furnace slag itself is hardened by a hydration reaction. Therefore, granulated blast furnace slag is pulverized and used as blast furnace cement raw material and concrete admixture (referred to as “granulated fine powder”). It is also used as an alternative. In addition to fine aggregate for concrete, fine aggregate for mortar, fine aggregate for blocks, etc., there are backfill materials for civil engineering work, embankment materials, etc. It can also be used as artificial sand for aquaculture or leisure beaches.

  However, since granulated blast furnace slag is generally produced by injecting water into the molten blast furnace slag and mixing and stirring it, a stretched part of the blast furnace slag is formed by the water flow during this cooling process, and this stretched part Breaks the blast furnace granulated slag into a needle-shaped vitrified slag having a diameter of about 0.1 to 0.5 mm and a length of about 1 to 5 mm (hereinafter referred to as “acicular slag”). Mix. Therefore, although it is close to natural sand in terms of chemical composition and physical properties, there is a problem that it is difficult to use because needle-like slag is stuck into a living body for materials and biological purposes that require handling.

  In addition to containing needle-like slag, the surface is sharpened compared to natural sand because it is rapidly cooled and formed, and when filled, it is less likely to become densely packed. The ground granulated blast furnace slag has a problem that the mass per unit volume (hereinafter referred to as “unit volume mass”) is smaller than that of natural sand. When blast furnace granulated slag is used as a fine aggregate for concrete, JIS stipulates that the unit volume mass needs to be 1.45 kg / liter or more.

  Therefore, in order to solve these problems, conventionally, the blast furnace granulated slag has been pulverized using a crusher. By this pulverization treatment, the acicular slag is destroyed, and at the same time, the particle size is reduced and the unit volume mass is increased. Various types of crushers are used in this crusher, and the main crushers include crushers of the type that crush with impact such as impact crushers, and crush with shearing force such as cone crushers. A type of crusher is mentioned. However, in any method, the crushing part of the crushing device and the blast furnace water granulated slag are crushed directly, and when the unit volume mass is adjusted within the range of the JIS standard value, the crushed blast furnace water granulated There was a problem that the slag became too fine. In addition, in a crusher that crushes by impact, such as an impact crusher, large particles that are in good contact with the crushing collision part are efficiently crushed, but small particles and needle-shaped slag are sufficiently in contact with the crushing collision part. In other words, the crushing efficiency was poor.

  Therefore, Patent Document 1 has been proposed as a means for solving these problems. The crushing method according to Patent Document 1 is a method in which particles of blast furnace granulated slag collide at a speed of 30 to 90 m per second with a layer of granulated blast furnace slag accumulated at a thickness of 20 mm or more to crush the blast furnace granulated slag. It is. According to Patent Document 1, since the blast furnace granulated slag particles collide with the blast furnace granulated slag layer, it is possible to prevent excessive crushing and there is no part to be worn by the crusher, so that the repair cost is also low. It can be demonstrated.

JP 2001-192713 A

  However, since the method according to Patent Document 1 is basically a crushing method using impact force caused by a collision, the crushing surface of the slag is crushed by a crusher that crushes by impact force or a crusher that uses shear force. As well as the problem of sharpness compared to natural sand, and the crushing surface is sharp, adjusting the unit volume mass within the range of JIS standard value will make the granulated blast furnace slag fine after crushing. The problem of being too much remains unresolved. If the crushing surface is sharper than natural sand, the filling rate of fine aggregate will be low, causing problems such as deterioration in performance of concrete structures and the like, and crushed blast furnace granulated slag is fine When it becomes too much, there arises a problem that a sieving process is required for adjusting the particle size, or that it is necessary to restrict the granulated blast furnace slag before being crushed to a predetermined particle size range.

  The present invention has been made in view of the above circumstances, and its purpose is to cultivate fine aggregates such as concrete, mortar, and blocks for seafood, as an alternative to granulated blast furnace slag, or for seafood When manufacturing artificial sand for beach use for leisure or leisure, the slag surface after granulation treatment is not sharp compared to the conventional method, and blast furnace granulation after granulation treatment compared to the conventional method An object of the present invention is to provide a granulating method for granulating blast furnace granulated slag capable of adjusting the unit volume mass within the specified value of JIS without refining the slag.

  In the blast furnace granulated slag sizing method according to the first invention for solving the above-described problem, the blast furnace granulated slag is disposed at a position that is eccentric from a rotating mixing pan and a center position of the mixing pan. In addition, the mixing tool rotating independently of the mixing pan and a scraper fixed and disposed inside the mixing pan are charged and stirred, and at least the blast furnace granulated slag is mixed. The particle size distribution is changed.

  The granulated granulation method of blast furnace granulated slag according to the second invention is characterized in that, in the first invention, the rotation direction of the mixing pan and the rotation direction of the mixing tool are opposite to each other. is there.

  The granulated granulation method for blast furnace granulated slag according to the third invention is characterized in that, in the first or second invention, the blast furnace granulated slag is charged batchwise into the high-speed agitating mixer. It is.

  In any one of the first to third inventions, the granulated blast furnace slag slag processing method according to a fourth aspect of the present invention is the mixing and stirring of the high speed mixer for preventing consolidation of blast furnace granulated slag. In addition, the particle size distribution of the blast furnace granulated slag is changed, and at the same time, the blast furnace granulated slag and the anti-caking agent are mixed.

  In any one of the first to fourth inventions, the blast furnace granulated slag agitated by the high-speed agitating mixer is a fine aggregate for concrete, One type or two or more types of fine aggregates for mortar, fine aggregates for blocks, artificial sand for culturing seafood, and artificial sand for beaches are used.

  According to the present invention, since the blast furnace granulated slag is agitated using a high-speed agitating mixer, the blast furnace water granulated slag does not have a crushing effect as in the case of crushing by a crusher, and the charged blast furnace water Friction between crushed slag particles acts mainly by friction (Attrition effect), and blast furnace granulated slag does not unnecessarily be granulated, resulting in rounded blast furnace granulated slag particles. The volume mass can be increased. In the past, it was sometimes necessary to restrict the granulated blast furnace slag before treatment to a specific size because it would be too fine to try to secure a specified unit volume mass. It becomes possible to relax.

  In addition, although the stirring process using a high-speed stirring mixer is mainly wear-resisting, needle-like slag with a small diameter is more fragile than other granular blast furnace granulated slag with a relatively large diameter, This stirring process preferentially crushes acicular slag, which not only increases the unit volume mass of blast furnace granulated slag, but also eliminates the problem of sticking into living organisms when used as artificial sand for living organisms. be able to.

  Hereinafter, the present invention will be specifically described.

  First, an outline of a method for producing granulated blast furnace slag as an object of the method of the present invention will be described. The molten blast furnace slag discharged together with the molten iron from the blast furnace is separated from the molten iron, and the separated molten blast furnace slag is dropped into the water sprayed at high speed and mixed with water and stirred to quench or melt. It is poured into a large amount of water flowing through the slag and rapidly cooled to produce glassy blast furnace granulated slag having a particle size of about 6 mm or less. The rapid solidification treatment using water, that is, the water granulation treatment, can be performed by directly granulating the molten slag discharged from the slag trough installed on the blast furnace casting floor, or once the molten slag discharged from the slag trough is temporarily removed. It does not matter whether it is housed in a slag container and subjected to a water granulation process at another location.

The produced granulated blast furnace slag is collected from the water using a filter and temporarily stored in a storage yard. Moisture is removed during this temporary placement, and the amount of moisture adhered to the granulated blast furnace slag is reduced. In practicing the present invention, it is not necessary to completely dry the granulated blast furnace slag. The chemical components of the obtained granulated blast furnace slag are as follows: SiO ₂ : 30 to 40% by mass, CaO: 35 to 50% by mass, Al ₂ O ₃ : 10 to 20% by mass, MgO: 3 to 10% by mass, FeO: 2 The basicity (CaO / SiO ₂ ) is approximately 1.1 to 1.4.

  Next, this blast furnace water granulated slag is used to make fine aggregate for concrete, fine aggregate for mortar, fine aggregate for blocks, artificial sand for culturing seafood, artificial sand for beach for leisure, etc. The granulated slag is subjected to a granulating process according to the present invention. The granulation processing according to the present invention is performed by, for example, a high-speed stirring mixer as shown in FIG. Here, FIG. 1 is a schematic perspective view showing an example of a high-speed stirring mixer used when carrying out the granulating method for granulated blast furnace slag according to the present invention.

  As shown in FIG. 1, a high-speed stirring mixer 1 used in the method of the present invention contains a stirring object such as a blast furnace granulated slag, and a mixing pan 2 that rotates while containing the stirring object. The mixing tool 2 (also referred to as “agitator”) 3 which is disposed in the center of the mixing pan 2 and deviated from the center position of the mixing pan 2 and rotates independently from the mixing pan 2 is fixed to the inside of the mixing pan 2. The scraper 4 is arranged. The mixing pan 2 and the mixing tool 3 can independently set the rotation direction and the number of rotations, and the rotation direction of the mixing pan 2 and the mixing tool 3 is reversed as shown in FIG. (Referred to as “back-flow agitation”) and, as shown in FIG. 3, the mixing pan 2 and the mixing tool 3 are agitated by two types of agitation methods (referred to as “forward-flow agitation”). can do. 2 and 3 are diagrams schematically showing the rotation direction of the mixing pan 2 and the mixing tool 3 and the stirring direction of the object to be stirred at that time, and the thick arrows in the drawings indicate the mixing pan 2 and the mixing tool. The rotation direction of the tool 3 is represented, and the thin arrow represents the stirring direction of the object to be stirred.

  In the high-speed stirring mixer 1, the rotating mixing pan 2 continuously and efficiently moves the object to be stirred to the vicinity of the rotating mixing tool 3, so that mixing of the object to be stirred is promoted. In particular, in the case of back-flow stirring, the object to be stirred flows backward due to a high speed difference between the mixing pan 2 and the stirring tool 3, and high shearing force acts on the object to be stirred to promote mixing of the object to be stirred. The scraper 4 generates a flow in the vertical direction and prevents the stir object from staying and sticking on the surface of the mixing pan 2. In the high-speed stirring mixer 1 shown in FIG. 1, the mixing pan 2 is inclined with respect to the horizontal plane, but may be horizontal without being inclined, and only one mixing tool 3 is provided inside the mixing pan 2. Although arranged, two or more may be arranged. When two or more mixing tools 3 are arranged, the shape of the mixing tool 3 does not need to be the same and may be changed.

  Blast furnace granulated slag is charged into such a high-speed agitating mixer 1, and granulated by agitation with blast furnace granulated slag. 4 and 5, blast furnace granulated slag A having a unit volume mass of 1.37 kg / liter and a coarse particle ratio of 2.91, and a unit volume mass of 1.17 kg / liter and a coarse particle ratio of 3.13. Reverse flow of two types of blast furnace granulated slag B, blast furnace granulated slag B, with the rotation speed of the mixing pan 2 being 30 times per minute (hereinafter referred to as “rpm”) and the rotation speed of the mixing tool 3 being 960 rpm and 1100 rpm. In the case of stirring, the result of investigating the influence of the stirring time on the coarse particle ratio and unit volume mass is shown. In the case of blast furnace granulated slag A in FIGS. 4 and 5, a case of forward flow stirring in which the rotation speed of the mixing tool 3 is 1100 rpm is also shown. In FIGS. 4 and 5, (forward) displayed in the latter stage of the number of revolutions expressed in rpm is forward flow stirring, while nothing is displayed in reverse flow stirring. Shall be displayed in the same display method.

  Here, the coarse particle ratio is a set of 10 types of standard mesh sieves of 80 mm, 40 mm, 20 mm, 10 mm, 5 mm, 2.5 mm, 1.2 mm, 0.6 mm, 0.3 mm, and 0.15 mm. Sieving test in order from the sieve with the largest mesh size, and the value obtained by dividing the sum of the mass percentages of the samples remaining on each sieve by 100. Incidentally, the coarse particle ratio of the fine aggregate is 2.6-3. .1 and about 6-8 for coarse aggregate. For example, when the sieving test was carried out, there was no residue in the standard mesh sieves 80 mm, 40 mm, 20 mm, 10 mm and 5 mm (cumulative residual rate 0%), and 3 in the 2.5 mm standard mesh sieve. % Remained (cumulative residual rate 3%), 27% remained with a 1.2 mm standard mesh screen (cumulative residual rate 30%), and 41% remained with a 0.6 mm standard mesh screen (cumulative residual rate 71). When the 0.3 mm standard mesh screen has 21% remaining (cumulative residual rate 92%), and the 0.15 mm standard mesh screen has 5% residual (cumulative residual rate 97%), 80 mm , 40 mm, 20 mm, 10 mm, 5 mm, 2.5 mm, 1.2 mm, 0.6 mm, 0.3 mm, and 0.15 mm, the sum of the cumulative residual ratios was 293 (0 + 0 + 0 + 0 + 0 + 3 + 30 + 71 + 92 + 97 = 293). Grain rate is A .93 (293/100 = 2.93).

  As shown in FIG. 4, it can be seen that as the stirring time becomes longer, the coarse particle ratio decreases, and as the rotational speed of the mixing tool 3 increases, the effect on the decrease in the coarse particle ratio increases. There is almost no difference between reverse flow stirring and forward flow stirring, and it can be seen that the same effect is acting. Further, as shown in FIG. 5, it can be seen that the unit volume mass increases as the stirring time becomes longer, and that the effect on the increase of the unit volume mass increases as the rotation speed of the mixing tool 3 increases. Similar to FIG. 4, there is almost no difference between the back-flow stirring and the forward-flow stirring, and it can be inferred that the same effect is acting. However, since the shearing force can be obtained with respect to the blast furnace granulated slag, the reverse flow stirring is preferable.

  FIG. 6 displays the transition during the stirring process of the relationship between the unit volume mass and the coarse particle ratio for the blast furnace granulated slag A and the blast furnace granulated slag B based on the results obtained in FIGS. 4 and 5. FIG. As shown in FIG. 6, the characteristics (unit volume mass and coarse particle ratio) of the blast furnace granulated slag after the stirring treatment are in accordance with the characteristics (unit volume mass and coarse grain ratio) of the blast furnace granulated slag before the stirring treatment. It was confirmed that it changed. Therefore, for example, when used as fine aggregate for concrete, the characteristics (unit volume mass and coarse particle ratio) of the blast furnace granulated slag before the stirring treatment are set so that the unit volume mass is 1.45 kg / liter or more. It can be seen that it is necessary to set the processing conditions (mainly the rotational speed and stirring time of the mixing tool). Depending on the application conditions, the coarse particle ratio may be regulated. In that case, it is necessary to set the stirring conditions so that not only the unit volume mass but also the coarse particle ratio falls within a predetermined range.

  This is because, for example, several types of blast furnace granulated slag having different characteristics (unit volume mass and coarse particle ratio) are preliminarily stirred to change the relationship between the unit volume mass and the coarse particle ratio as in FIG. Knowing the characteristics of the granulated blast furnace slag (unit volume mass and coarse particle ratio) to be agitated, and examining the characteristics of the granulated blast furnace slag, the unit volume mass and the coarse particle ratio obtained in advance By comparing this relationship, it is possible to set appropriate stirring conditions. Of course, when used for artificial sand for seafood aquaculture or artificial sand for beaches, the specified values for unit volume mass and coarse grain ratio may differ from the specified values for fine aggregate for concrete. In such a case, the stirring process is performed under the stirring condition that matches the specified value.

  For this reason, the stirring treatment is preferably performed in a batch manner. This is because, in the case of the batch type, an optimum stirring process can be performed according to the characteristics (unit volume mass and coarse particle ratio) of the blast furnace granulated slag before the stirring process. In addition, since the granulated blast furnace slag has a property of hardening by a hydration reaction, it is necessary to add an anti-caking agent to prevent hardening of the granulated blast furnace slag somewhere. In the method, mixing of the anti-caking agent of granulated blast furnace slag can be carried out in the stirring treatment by the high-speed stirring mixer 1. Thereby, the mixing operation | work of the anti-caking agent conventionally performed separately can be abbreviate | omitted. If the amount of water adhering to the granulated blast furnace slag before the stirring treatment is 20% or less, the stirring treatment can be performed without any problem.

  In the present invention, since the blast furnace granulated slag is agitated by the high-speed agitating mixer 1 in this way, the blast furnace granulated slag does not have a crushing effect as in the case of crushing by a crusher, and is charged. The friction effect between the granulated slag particles (Attrition effect) mainly acts, and the granulated blast furnace slag particles without rounding the blast furnace granulated slag unnecessarily, resulting in blast furnace granulated slag particles. The unit volume mass of the slag can be increased. That is, the unit volume mass can be increased without significantly reducing the average particle size as compared with that before the stirring treatment.

  In addition, although the agitation treatment is mainly concerned with the abrasion effect, the needle-shaped slag with a small diameter is weaker than other granular blast furnace granulated slag, and the acicular slag is preferentially crushed by the agitation process, Not only can the unit volume mass of the granulated slag be increased, but also when it is used as artificial sand for living organisms, the problem of being stuck in the living organism can be solved.

When stirring with the high-speed stirring mixer 1, the reason why the granulated blast furnace slag does not become fine as in the case of crushing with a crusher is that when the total input power is constant, This is considered to be caused by the small input power (kW / m ³ ). Incidentally, the input power of the high-speed stirring mixer 1 is 40 to 60 kW / m ³ , whereas the input power of the crusher is usually 200 to 250 kW / m ³ .

  Examples of the present invention will be described below. The method of the present invention was carried out in order to produce fine aggregate for concrete using blast furnace granulated slag having a unit volume mass of 1.32 to 1.34 kg / liter and a coarse particle ratio of 2.99 to 3.05. .

  First, using a high-speed agitating mixer shown in FIG. 1, the ground granulated blast furnace slag was agitated by back-flow agitation at a mixing tool rotation speed of 500 rpm, 750 rpm, and 1000 rpm. The relationship with grain rate was investigated. The number of rotations of the mixing pan was 30 rpm. For comparison, the crushing method proposed in Patent Document 1 is also subjected to crushing treatment (referred to as “conventional method”) while changing the collision speed of the blast furnace granulated slag to the slag layer, and the unit volume mass and coarse particles The relationship with the rate was investigated.

  FIG. 7 is a diagram showing the results of investigating the transition of the unit volume mass and the coarse particle ratio depending on the stirring time when stirring is performed using a high-speed stirring mixer. As shown in FIG. 7, the unit volume mass increased with the passage of the stirring time, and the coarse particle ratio decreased with the passage of the stirring time. It was found that the larger the rotation speed of the mixing tool, the greater the change in unit volume mass and coarse particle ratio.

  FIG. 8 is a diagram showing the transition of the relationship between the unit volume mass and the coarse particle ratio based on these results. FIG. 8 also shows the result of the conventional method. As is clear from FIG. 8, it was found that also in the method of the present invention, the relationship between the unit volume mass and the coarse particle ratio slightly changes depending on the rotation speed of the stirring tool. That is, it was confirmed that the slower the number of revolutions of the stirring tool, the larger the unit volume mass can be achieved without refining the granulated blast furnace slag. On the other hand, in the conventional method, it was found that the granulated blast furnace slag needs to be finer than the method of the present invention in order to make the unit volume mass equivalent to that of the method of the present invention.

  The coarse grain ratio required for fine aggregates varies slightly depending on the situation of use. In addition to the fact that the fine aggregate for concrete manufactured this time has a unit volume mass of 1.45 kg / liter or more (JIS regulations) Since it was specified that the coarse particle ratio was in the range of 2.4 to 2.8, as the sizing conditions satisfying these specifications, (1) the rotation speed of the stirring tool was set to 750 rpm, and the stirring time was set to It was decided to carry out the granulation treatment under two types of stirring conditions: back-flow stirring for 120 seconds, and (2) back-flow stirring for which the stirring tool rotation speed was 1000 rpm and the stirring time was 45 seconds.

  FIG. 9 shows the results of investigating the particle size distribution of the granulated blast furnace slag after the granulation treatment under these conditions. FIG. 9 also shows the particle size distribution of granulated blast furnace slag before sizing treatment. The particle size distribution was investigated using a sieve. Comparing the particle size at which the cumulative mass corresponding to the average particle size becomes 50% by mass, the granulated blast furnace slag before treatment is about 0.91 mm, whereas when the particle size is adjusted at 750 rpm, the particle size is about 0.1. When the particles were sized at 81 mm and 1000 rpm, the particle size was about 0.77 mm, and the particles could be sized without significantly reducing the slag particle size compared to before the treatment.

  Using the granulated blast furnace granulated slag as a fine aggregate in this way, concrete blocks were prepared under various conditions, and concrete evaluation was performed in laboratory tests. In this evaluation test, in addition to the fine aggregate produced by the method of the present invention (material applied to the present invention), the fine aggregate produced by the conventional method (conventional material) was also used for comparison. The material to which the present invention was applied and the conventional material were blended in natural sand at substitution rates of 30%, 50% and 70% as substitutes for natural sand. In this evaluation test, a test using only natural sand as a fine aggregate was also conducted.

  Table 1 shows blending conditions and test results. In addition, FIG. 10, FIG. 11 and FIG. 12 show the relationship between the unit water amount and the blast furnace granulated slag replacement rate among the blending conditions, and FIG. 13, FIG. 14 and FIG. The relationship between the compressive strength at the time of passage and the substitution rate of granulated blast furnace slag is shown. The W / C shown in Table 1 is the water / cement ratio, and S / A is the fine aggregate ratio, and “None” in the column of the type of granulated blast furnace slag is only natural sand. This is a test formulated as a fine aggregate.

As is clear from Table 1 and FIGS. 10 to 12, the unit water amount for obtaining the same fluidity is 2 to 5 kg / m when the present application material is blended as compared with the case where the conventional material is blended. ³ decreased. In addition, as apparent from Table 1 and FIGS. 13 to 15, in the compressive strength test on the material age of 28 days, when the present invention application material is blended, the value is equal to or greater than that when the conventional material is blended. was gotten.

It is a schematic perspective view which shows one example of the high-speed stirring mixer used when enforcing the granulating method of the granulated blast furnace slag according to the present invention. It is a figure which shows typically the rotation direction of the mixing pan and mixing tool at the time of backflow stirring, and the stirring direction of the to-be-stirred object at that time. It is a figure which shows typically the rotation direction of the mixing pan and mixing tool at the time of forward flow stirring, and the stirring direction of the to-be-stirred object at that time. It is a figure which shows the influence of the stirring time which acts on the coarse particle rate at the time of carrying out the stirring process of 2 types of granulated blast furnace slag. It is a figure which shows the influence of the stirring time which acts on unit volume mass at the time of stirring process of 2 types of granulated blast furnace slag. It is the figure which displayed transition of the relation between unit volume mass and a coarse grain rate. It is a figure which shows transition by the stirring time of the unit volume mass and the coarse particle rate at the time of stirring a certain blast furnace granulated slag. It is a figure which shows transition of the relationship between unit volume mass and a coarse grain rate at the time of stirring a certain blast furnace granulated slag. It is a figure which compares and compares the particle size distribution of the granulated blast furnace slag after particle size processing with the particle size distribution before a process. Test No. It is a figure which shows the relationship between the unit water amount in 1-7, and the substitution rate of blast furnace granulated slag. Test No. It is a figure which shows the relationship between the unit water quantity in 8-13, and the substitution rate of blast furnace granulated slag. Test No. It is a figure which shows the relationship between the unit water quantity in 14-19, and the substitution rate of blast furnace granulated slag. Test No. It is a figure which shows the relationship between the compression strength at the time of 28-day progress in 1-7, and the substitution rate of granulated blast furnace slag. Test No. It is a figure which shows the relationship between the compressive strength at the time of 28-day progress in 8-13, and the substitution rate of granulated blast furnace slag. Test No. It is a figure which shows the relationship between the compressive strength at the time of 28-day progress in 14-19, and the substitution rate of blast furnace granulated slag.

Explanation of symbols

1 High-speed stirring mixer 2 Mixing pan 3 Mixing tool 4 Scraper

Claims (5)

  The granulated blast furnace slag is arranged in a rotating mixing pan, in a position eccentric from the center position of the mixing pan, in a rotating tool independent of the mixing pan, and fixed inside the mixing pan. A granulated blast furnace slag slag sizing method, wherein the blast furnace granulated slag is changed in particle size distribution at least by charging the mixture into a high-speed stirring mixer equipped with the scraper.   2. The granulating method for granulating blast furnace granulated slag according to claim 1, wherein the rotation direction of the mixing pan and the rotation direction of the mixing tool are opposite directions.   The granulated blast furnace slag sizing method according to claim 1 or 2, wherein the blast furnace granulated slag is charged into the high-speed stirring mixer in a batch manner.   A blast furnace granulated slag anti-caking agent is added to the high-speed agitating mixer and mixed and stirred to change the particle size distribution of the blast furnace water granulated slag and simultaneously mix the blast furnace granulated slag and the anti-caking agent. The blast furnace granulated slag granulating method according to any one of claims 1 to 3.   The granulated blast furnace slag agitated by the high-speed agitating mixer is one kind or two of fine aggregate for concrete, fine aggregate for mortar, fine aggregate for block, artificial sand for aquaculture, and artificial sand for beach. The granulated blast furnace slag sizing method according to any one of claims 1 to 4, wherein the granulated slag is a seed or more.

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