JP2012184143A - Apparatus for manufacturing water granulated slag, and method for controlling the granule size - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a water granulated slag having a desired granule size by controlling simply the granule size of the water granulated slag manufactured in a water granulation step of a nonferrous smelting process.SOLUTION: In an apparatus for manufacturing a water granulated slag, in which a water granulated slag C water-granulated from a molten-state slag A discharged from a smelting furnace in a water granulating launder 102 with a water-granulating water B is made to settle in a water-granulating pit 104, the water granulated slag C water-granulated in the water-granulating launder 102 is made to flow in the water-granulating pit 104 together with a water-granulating water B1; a water-granulating water B2 is made to flow directly into the water-granulating pit 104 through a bypass flow path 103b branched from a flow path 103a feeding the water-granulating water B1 to the water-granulating launder 102 without passing the water-granulating water B2 through the water-granulating launder 102; and the overflow amount of a water granulated slag C2 made to overflow from the water-granulating pit 104 together with the water-granulating waters B1, B2 is controlled by the flow amount of the water-granulating water B2 made to flow directly in the water-granulating pit 104 through the bypass flow path 103b, thereby controlling the granule size of the water granulated slag C1 made to settle in the water-granulating pit 104.

Description

  The present invention relates to an apparatus for producing granulated slag in a non-ferrous smelting process and a particle size control method thereof.

  Conventionally, in a non-ferrous smelting process for obtaining a valuable metal such as copper or nickel from a non-ferrous metal raw material such as sulfide concentrate containing a valuable metal such as copper or nickel, for example, a smelting furnace such as a flash furnace and the like A method using a smelting furnace, a converter, and a refining furnace is employed.

In copper smelting, which is an example of non-ferrous metal smelting, copper sulfide concentrate, flux, etc. are blown into a flash smelting furnace together with auxiliary fuel, and the copper content is mainly composed of FeS and Cu ₂ S by oxidation smelting. It is made into a white river whose main component is a river or Cu ₂ S, and a sulfur content is recovered as sulfurous acid gas. The obtained river or white river is extracted from a smelting furnace such as a self-melting furnace into a ladle, etc., transported to the converter, and charged into the converter. Then, oxidation smelting is continued in the converter. Since the karami generated in the self-melting furnace is accompanied by a river, once it is left in the smelting furnace to separate the kawa and karami, the karami is made into granulated slag in the pulverization process. Then, it is charged into the converter of the next process, followed by oxidation smelting.

  Karami is a high-temperature liquid in the smelting furnace, but in the water granulation process, it is rapidly cooled and solidified by water or the like, and is crushed into sand or gravel and taken out as granulated slag.

  That is, in the non-ferrous smelting process, in the water granulation process, water is directly blown to the molten calami discharged from the furnace to rapidly cool and solidify to produce granulated slag.

  Conventionally, in the above-described water granulation step, for example, a granulated slag manufacturing apparatus 100 having a configuration as shown in FIG. 4 has been used.

  In this granulated slag production apparatus 100, the granulated water B is caused to flow through the flow path 103 into the granulated slag 102 into which the calami A discharged from a smelting furnace (not shown) flows through the calami slag 101. The calami A discharged from the smelting furnace flows into the granulated slag 102 through the calami slag 101 and is crushed by the granulated water B flowing down the slag 102, The slag C falls into the granulated pit 104. The granulated slag C1 that has settled in the granulated pit 104 is scooped up by a bucket elevator 105 provided in the granulated pit 104 and is transported to the next step.

  The granulated slag C1 thus produced has a particle size of about 0.1 to 4.0 mm, and most of it is used as a cement raw material.

  In this granulated slag production apparatus 100, the granulated slag C that has fallen into the granulated pit 104 has a large proportion of fine granulated slag having an average particle size of about 0.6 mm, and does not settle to the bottom of the pit. It floats in the granulated water in the granulated pit 4. Further, some of the granulated slag C2 overflows with the granulated water B from the granulated pit 104. The fine granulated slag C2 overflowed from the granulated pit 104 together with the granulated water B is settled and collected in the granulated secondary pit 106 provided in the subsequent step. The fine granulated slag C2 has an average particle size of about 0.6 mm, and the average particle size is lowered when mixed with the granulated slag C1 of the product.

  The granulated slag C1 thus produced has a particle size of about 0.1 to 4.0 mm, and most of it is used as a cement raw material.

  By the way, if the granulated slag has a particle size of about 1.5 to 4.0 mm and can be shifted to a size larger than the above-described granulated slag C1, it can be used as an aggregate or sandblasting material for caisson. It is desirable to control the slag particle size.

  An easy way to shift the granularity of granulated slag to a larger size is to increase the amount of water flowing into the granulated pit 104 in order to increase the amount of overflow from the granulated pit 104 together with the granulated water B. However, in the conventional granulated slag production apparatus 100, the amount of the granulated water B is increased, and the water pressure is increased accordingly. Therefore, there is a problem that the granulated slag C has a finer particle size.

  Conventionally, a method for increasing the particle size of the granulated slag has been mainly modified by a nozzle shape that ejects the granulated water.

  For example, Patent Document 1 discloses a technique for injecting cooling water of molten slag into four locations and reducing the hydraulic pressure of the granulated water first hitting the molten slag, thereby coarsening the particle size of the granulated slag. Are listed.

  Patent Document 2 describes a method of classifying copper slag into a particle size of about 1.5 to 3.5 mm using a jumping screen.

  Patent Document 3 describes a technique for separating wood fragments, plant roots, pumice, and the like having a specific gravity smaller than that of aggregates using a jet water stream when producing concrete aggregates.

  Furthermore, Patent Document 4 describes a technique for removing, for example, floating carbon floating in raw water when a sand is collected by using a cyclone as a classification device.

Japanese Patent Laid-Open No. 61-021938 JP 2003-222475 A JP 08-155330 A JP 2005-256334 A

  However, remodeling the nozzle shape as disclosed in the above-mentioned patent document 1 is limited in remodeling space and cannot be adjusted during operation, and the facility must be stopped for a long time for remodeling. There is a problem that there is. Furthermore, when the amount of water is reduced to reduce the water pressure, there is a problem that the molten calami is insufficiently cooled and the possibility of causing a steam explosion increases.

  In addition, the method using a screen as disclosed in the above-mentioned Patent Document 2 is not preferable because it requires an increase in cost due to the introduction of new equipment and a large installation space.

  In addition, the method using a jet water flow as disclosed in Patent Document 3 is not preferable because it requires an increase in cost due to the introduction of new equipment and the modification of existing equipment.

  Furthermore, the technique disclosed in Patent Document 4 is not preferable because it requires introduction of new equipment.

  Therefore, the present invention has been made to solve the conventional problems as described above, and the object thereof is not produced in the conventional problems, and is manufactured in the water granulation step of the non-ferrous smelting process. An object of the present invention is to provide a granulated slag production apparatus and a method for controlling the particle size of the granulated slag capable of easily controlling the particle size of the granulated slag.

  Other objects of the present invention and specific advantages obtained by the present invention will become more apparent from the description of embodiments described below.

  In the present invention, in order to solve the above-mentioned problem, a flow path for branching the granulated water in the conventional granulated slag manufacturing apparatus into two and allowing the granulated water to flow into the granulated pit via the water granulated slag In addition, a bypass channel is provided for allowing the granulated water to flow directly into the granulation pit without going through the granulation basin, and the flow rate of the granulated water directly flowing into the granulation pit via the bypass channel Controls the overflow amount of fine granulated slag overflowed from the crushing pit.

  That is, the present invention is an apparatus for producing granulated slag, which is a granulated slag obtained by granulating molten calami discharged from a smelting furnace with granulated water to form granulated slag, and the above-mentioned granulated slag A granulated pit into which the granulated slag that has been crushed in water together with the granulated water, a flow path for supplying the granulated water to the granulated tub, and a branch from the flow path, A bypass flow path that directly flows into the granulation pit without using the smash, and the granulated water from the granulation pit is flown according to the flow rate of the granulated water that flows directly into the granulation pit via the bypass flow path. At the same time, the amount of overflow of the granulated slag overflowed is controlled to cause the granulated slag having a target particle size to settle in the granulated pit.

  In the present invention, the molten calami discharged from the smelting furnace is granulated with granulated water in a granulated slag to form granulated slag, and the granulated granulated slag is settled in the granulated pit. A granulated slag particle size control method in a granulated slag production apparatus as described above, wherein the granulated slag granulated in the granulated slag flows into the granulated pit together with the granulated water, and the granulated slag By means of a bypass channel branched from the channel for supplying the granulated water to the granulated water, the granulated water is allowed to flow directly into the granulated pit without passing through the granulated pit, and the granulated pit is passed through the bypass channel. The amount of granulated slag that overflows with the granulated water from the granulated pit is controlled by the flow rate of the granulated water that flows directly into the granulated pit, thereby controlling the particle size of the granulated slag that settles in the granulated pit It is characterized by

  According to the present invention, it is possible to easily control the particle size of the granulated slag produced in the non-ferrous smelting process, and without affecting the operation without stopping the equipment. Such conventional problems as described above can be solved.

It is sectional drawing which shows typically the structural example of the granulated slag manufacturing apparatus which concerns on this invention. It is a figure which shows the relationship between a granulated water bypass water amount and the fine granulated slag amount overflowed from a granulated pit. It is a figure which shows the relationship between the amount of granulated water bypass water, and the average particle diameter of the granulated slag used as a product. It is sectional drawing which shows typically the structural example of the conventional granulated slag manufacturing apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The present invention is applied to a granulated slag manufacturing apparatus 10 having a configuration as shown in FIG.

  The granulated slag production apparatus 10 is an improvement of the conventional granulated slag production apparatus 100 shown in FIG. 4, and the same reference numerals in FIG. The code | symbol is attached | subjected.

  In this granulated slag manufacturing apparatus 10, granulated water B is introduced into a granulated slag 102 into which calami A discharged from a smelting furnace (not shown) is introduced via the calami slag 101 through a channel 103. The channel 103 of the granulated water B is branched into a channel 103a and a bypass channel 103b, and the granulated water B1 flows into the granule 102 through the channel 103a, and the granulated water B2 is water. The water is directly introduced into the granulated pit 4 through the bypass flow path 103b without going through the smash 102.

  In this granulated slag production apparatus 10, the granulated water B1 is caused to flow through the flow path 103a into the water granule 102 into which the calami A discharged from the smelting furnace (not shown) flows. The calami A discharged from the smelting furnace flows into the granulated slag 102 through the calami slag 101, and is crushed by the granulated water B1 flowing down the slag 102, The slag C falls into the granulated pit 104. The granulated slag C1 settled in the granulated pit 104 is scooped up by the bucket elevator 105 provided in the granulated pit 104 and conveyed to the next step. Instead of settling in the granulated pit 104, it overflows from the granulated pit 104 together with the granulated water B1 and B2.

  The fine granulated slag C2 overflowing from the granulated pit 104 together with the granulated water B1 and B2 settles in the granulated secondary pit 106 provided in the subsequent process, and is recovered using an excavator or the like. It is not mixed in the granulated slag C1. This fine granulated slag C2 has a conventional average particle size of about 0.6 mm, and if mixed with the granulated slag of the product, the average particle size will decrease. By overflowing a large amount of the fine granulated slag C2, the average particle diameter of the granulated slag C1 of the product is increased as a result.

  In this granulated slag manufacturing apparatus 10, in order to overflow the fine granulated slag C2 in a larger amount than before, a bypass channel 103b is provided in the channel 103a for allowing the granulated water B1 to flow into the granulated slag 102. Yes. By causing the granulated water B2 to flow into the granulated pit 104 through the bypass passage 103b, the amount of water actually supplied to the slag is not changed, and only the amount of water flowing into the granulated pit 104 is increased. can do. For this reason, in this granulated slag manufacturing apparatus 10, it becomes possible to overflow the granulated slag C2 more than before, and accordingly, the amount of fine granulated slag discharged from the granulated pit 104 is increased. be able to.

  The granulated slag manufacturing apparatus 10 has a flow rate control means for arbitrarily changing the amount of the granulated water B2 that flows directly into the granulated pit 104 through the bypass passage 103b, that is, the amount of the granulated water bypass water. A control damper 107 is provided in the bypass flow path 103b.

  That is, this granulated slag production apparatus 10 granulates molten calami A discharged from a smelting furnace with granulated water B in a granulated slag 102 to form granulated slag C, and the granulated granulated water. An apparatus for producing granulated slag in which the slag C is allowed to settle in the granulated pit 104. In this granulated slag producing apparatus 10, the granulated slag C that has been granulated in the granulation tub 102 is treated with granulated water. B1 is allowed to flow into the granulated pit 104 together with the bypass granule 103b branched from the flow path 103a for supplying the granulated water B1 to the granulated slag 102. Due to the flow rate of the granulated water B2 that directly flows into the granulated pit 104 and directly flows into the granulated pit 104 via the bypass channel 103b, it overflows from the granulated pit 104 together with the granulated water B1 and B2. By controlling the overflow of slag C2, to control the particle size of the granulated slag C1 to be settled in granulated pits 104.

  In the granulated slag manufacturing apparatus 10 having such a configuration, the amount of granulated water bypass water per hour is adjusted stepwise in the range of 50 to 200 T / H, and the amount of granulated water bypass water and the granulated pit 104 are adjusted. When the overflow amount (T / D) per day of the fine granulated slag C2 overflowed was observed, the results shown in FIG. 2 were obtained.

  Moreover, in the granulated slag manufacturing apparatus 10, when the tendency of the granulated water bypass water amount and the average particle diameter of the granulated slag C1 used as a product was observed, the result as shown in FIG. 3 was obtained.

  As apparent from FIG. 2, in the granulated slag production apparatus 10, the amount of the granulated water bypass water increases, that is, the finer the overflow from the granulated water pit 104 increases as the amount of water flowing into the granulated pit 104 increases. The amount of overflow of fresh granulated slag C2 is increasing.

  As is clear from FIG. 3, in the granulated slag production apparatus 10, the average of the granulated slag C <b> 1 of the product increases as the amount of granulated bypass water increases, i.e., the amount of water flowing into the granulated pit 104 increases. The particle size is also increasing, and the particle size of the granulated slag C2 can be controlled by adjusting the amount of the granulated water bypass water. Thereby, the yield of the granulated slag C1 which passes as a product with a large particle size can be increased.

  The average particle size was determined using a rosin-ramler diagram after sieving using a sieve having an opening of 2.35 mm, 1.18 mm, and 0.6 mm.

  In the granulated slag production apparatus 10 as described above, the molten calami A discharged from the smelting furnace is granulated with the granulated water B in the granulated slag 102 to obtain the granulated slag C, and the granulated granulated water. In the conventional granulated slag manufacturing apparatus 100 in which the slag C is allowed to settle in the granulated pit 104, the bypassed flow is such that the granulated water B2 flows directly into the granulated pit 4 without passing through the granulated slag 102. The size of the granulated slag produced in the non-ferrous smelting process of the non-ferrous smelting process is simplified without changing the production facility of the granulated slag, and without affecting the operation such as steam explosion. It is possible to produce a granulated slag having a desired particle size.

  DESCRIPTION OF SYMBOLS 10 Granulated slag manufacturing apparatus, 101 Calami trough, 102 Granulated trough, 103, 103a channel, 103b Bypass channel, 104 Granulated pit, 105 Bucket elevator, 106 Granulated secondary pit, 107 Control damper, A Calami, B, B1, B2 Granulated water, C, C1, C2 Granulated slag

Claims (3)

A granulated slag made by granulating molten calami discharged from a smelting furnace with granulated water to form granulated slag,
A granulated pit into which the granulated slag that has been granulated in the granulated slag flows together with the granulated water,
A flow path for supplying the granulated water to the granulated paddle,
A bypass flow path branched from the flow path and allowing the granulated water to flow directly into the granulated pit without going through the water granulated basin,
By controlling the amount of granulated slag that overflows from the granulated pit with the granulated water by the flow rate of the granulated water that flows directly into the granulated pit via the bypass channel, An apparatus for producing granulated slag, wherein the granulated slag is allowed to settle in the granulated pit.   The apparatus for producing granulated slag according to claim 1, further comprising a flow rate control means for controlling the flow rate of the granulated water directly flowing into the granulated pit via the bypass channel. Granulated slag in which molten calami discharged from the smelting furnace is granulated with granulated water in granulated slag to form granulated slag, and the granulated slag is allowed to settle in the granulated pit. A method for controlling the particle size of granulated slag in the manufacturing apparatus of
While allowing the granulated slag that has been granulated in the above-mentioned granulated water to flow into the granulated pit together with the granulated water,
By a bypass channel branched from the channel for supplying the granulated water to the granulated water, the granulated water is directly flowed into the granulated pit without going through the water granulated material,
The amount of granulated slag that overflows with the granulated water from the granulated pit is controlled by the flow rate of the granulated water that flows directly into the granulated pit via the bypass flow path, A method for controlling the particle size of granulated slag, which is characterized by controlling the particle size of the granulated slag settled in the water.

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