JP6025916B1 - Aluminum briquette and manufacturing method thereof - Google Patents

Abstract

An aluminum briquette and a method for producing the same are provided that are less expensive than conventional aluminum briquettes. An aluminum briquette manufacturing method is a method of manufacturing an aluminum briquette by blending a plurality of raw materials. The first hopper 1 has aluminum pellets, aluminum scraps, and crushed or cut as a first raw material. While storing at least one selected from the group consisting of aluminum scrap, as the second raw material in the second hopper 2, steel pellets, iron particles, iron scrap, iron powder, aluminum particles having an aluminum purity of 25% to 80%, And a first step of storing at least one selected from the group consisting of aluminum ash, a second step of charging the first raw material and the second raw material into the mixing device 5 respectively, and mixing the first raw material and the second raw material And a fourth step of compression-molding the mixed material into a lump. [Selection] Figure 2

Description

  TECHNICAL FIELD The present invention relates to an aluminum briquette mainly used as a deoxidizing material in a steelmaking furnace or the like, or used as an aluminum killed steel or a heating material for increasing a melting temperature in various steelmaking methods, and a method for producing the same. The present invention relates to a manufacturing method of an aluminum briquette that is manufactured by blending a plurality of raw materials with an aluminum briquette that is inferior in effect to briquettes and has a low cost, and an aluminum briquette manufactured by the manufacturing method.

  For example, in a steelmaking furnace, an aluminum deoxidizer is conventionally used to remove oxygen contained in hot metal or molten steel. Aluminum deoxidizers mainly include deoxidized lumps, pellets and briquettes. The deoxidized lump is manufactured by melting aluminum scrap collected by recycling and aluminum scrap such as used aluminum can (UBC), and the aluminum purity of the deoxidized lump is 94% or more. On the other hand, since the pellet is manufactured only from UBC having high aluminum purity, the aluminum purity is about 95%. With deoxidized lumps and pellets, the pellets are cheaper by about 15 to 20 yen than the deoxidized lumps. However, since the pellet is lighter than the deoxidized lump and has a lower specific gravity, it is difficult to sink into the molten steel. Therefore, the deoxidation efficiency of the pellet is poor, and the actual unit price calculated from the viewpoint of the deoxidation efficiency and the like tends to be higher than the deoxidized mass. Therefore, many steel manufacturers currently use deoxidized lump as a deoxidizer more than pellets.

  On the other hand, briquette is obtained by compression-molding a plurality of pellets in order to overcome the weaknesses of pellets (see, for example, Patent Document 1), and can be expected to have good deoxidation efficiency because of its high specific gravity. Moreover, the aluminum purity is about 95%, similar to the pellets. Here, since the conventional briquette uses pellets as a 100% raw material and the pellets use UBC as a 100% raw material, there is an advantage if UBC can be obtained at low cost. However, with the recent increase in demand for aluminum scrap overseas, the export of aluminum scrap has increased. In particular, UBC has a high aluminum purity, and the price of UBC in Japan has increased. . If the price of UBC rises, it will be a cost burden for the manufacturer if the price of pellets and briquettes made from UBC is not raised, but it is difficult to raise the price of pellets, which is the selling point due to the low surface unit price. The current situation is that the profitability of manufacturers is under considerable pressure.

Japanese Patent Laid-Open No. 7-118765

  The present invention has been made paying attention to the above-mentioned problems, and is produced by blending a plurality of raw materials with an aluminum briquette that is inferior in effect (for example, deoxidation efficiency) and low in cost as compared with conventional aluminum briquettes. It aims at providing the manufacturing method of the aluminum briquette which can be manufactured, and the aluminum briquette manufactured by the manufacturing method concerned.

The object of the present invention is a manufacturing method for manufacturing an aluminum briquette used for hot metal and deoxidation of molten steel by mixing a plurality of raw materials, and mixing the first raw material and the second raw material with a mixing device And a molding step in which the mixed material is compression-molded into a lump with a molding device, and the first raw material is selected from the group consisting of aluminum pellets, aluminum scrap, and aluminum scrap that has been crushed or cut. It consists of at least one, and the second raw material is at least one selected from the group consisting of steel pellets, iron particles and iron powder, aluminum particles having a predetermined aluminum purity of 25% to 80%, and 10% to 70% of at least one selected from the group consisting of aluminum ash having a predetermined aluminum purity. In the mixing step, Aluminum briquettes having an aluminum purity and specific gravity of the first material and the second material to be produced is achieved by the manufacturing method of an aluminum briquettes to be mixed is selected.

In the manufacturing method having the above-described configuration, before the mixing step, the first raw material is stored in a first hopper and the second raw material is stored in a second hopper, and the first raw material and the second raw material are stored. It is preferable to further include a charging step of charging the raw materials into the mixing device.

In the charging step, the first material and the second material are respectively conveyed to the mixing device by the first conveying conveyor and the second conveying conveyor, and the conveying speed by the first conveying conveyor and the second conveying conveyor is set. It is preferable to control the input amount of the first raw material and the second raw material to be input to the mixing device by controlling

  The aluminum scrap is preferably a used aluminum can.

  Moreover, it is preferable that the said aluminum grain is what generate | occur | produces at the time of aluminum melt | dissolution at the time of manufacturing an aluminum product. Specifically, a material obtained by screening aluminum ash generated during aluminum dissolution through a sieve is used.

  Moreover, it is preferable that coke and / or lime is further added to the mixing device.

  According to the present invention, it is possible to produce an aluminum briquette that is inferior in effect (for example, deoxidation efficiency) and low in cost as compared with a conventional aluminum briquette.

It is a flowchart of the manufacturing method of the aluminum briquette which concerns on one Embodiment of this invention. It is a schematic block diagram of the manufacturing method of the aluminum briquette which concerns on one Embodiment of this invention. It is a schematic block diagram of the manufacturing method of the aluminum briquette which concerns on other embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a flowchart showing each step of an aluminum briquette manufacturing method (hereinafter referred to as the present manufacturing method) according to an embodiment of the present invention, and FIG. 2 shows a schematic configuration of each step. Hereinafter, the present invention will be described in more detail with reference to the flowchart. Aluminum briquettes are used for deoxidation of hot metal and molten steel by being introduced into hot metal and molten steel, or are used for raising the melting temperature of aluminum killed steel or various melting methods. A lump having a weight of 80 g to 300 g. Since the aluminum briquette has a large specific gravity, it sinks when put into hot metal or molten steel as a deoxidizing material, and exhibits a good deoxidizing effect.

  The present manufacturing method stores in the first hopper 1 at least one selected from the group consisting of crushed or cut aluminum scrap, aluminum pellets, and aluminum scrap as a first raw material for aluminum briquettes, and the second hopper 2 is a storage step of storing at least one selected from the group consisting of steel pellets, iron particles, iron powder, aluminum particles having an aluminum purity of 25% to 80%, and aluminum ash as the second raw material of aluminum briquette ( First step) S1, a first raw material and a second raw material are charged into the mixing device from a conveying conveyor such as a baltic conveyor capable of adjusting the conveying speed, respectively (second step) S2, and charged into the mixing device. A mixing step (third step) S3 to mix the first raw material and the second raw material into a mixed material; Comprising a slip material in the molding apparatus and molding step (fourth step) S4 compression molding agglomerate (briquette), the.

  In the first step S1, a used aluminum can that is recovered by recycling or the like can be suitably used as the aluminum scrap as the first raw material. The aluminum can has an aluminum purity of about 95%. The aluminum can is preferably subjected to a heat treatment after being washed as necessary. This is because impurities such as printing paints and protective coating materials are present on the surface of the aluminum can, and the impurities can be removed to obtain an aluminum can without impurities. The heat treatment can be performed by, for example, a conventionally known heating device such as a rotary kiln. And the thing which grind | pulverized or cut the aluminum can finely with the conventionally well-known shredder apparatus is used as a 1st raw material.

  Moreover, the aluminum pellet used as a 1st raw material is the said aluminum scrap further made into the shape that the small piece was rounded with the granulator. The total length of the aluminum pellet is about 1 mm to 20 mm. Aluminum pellets have an aluminum purity of about 95%, but have a very low specific gravity compared to aluminum briquettes.

  Moreover, the aluminum scrap used as the first raw material is granular or powdered aluminum generated when an aluminum product is manufactured, or aluminum chips. Aluminum scrap has an aluminum purity of about 70-80%.

  These first raw materials are materials for ensuring the aluminum purity of the manufactured aluminum briquette, and are either crushed or cut aluminum scrap, aluminum pellets and aluminum scrap, or a combination of several materials Is stored in the first hopper 1 as the first raw material.

  On the other hand, the steel pellet used as the second raw material is a granular product in which small pieces are rounded by a granulator after removing the impurities by washing the used steel can collected by recycling etc. . The total length of the steel pellet is about 1 mm to 20 mm. Steel pellets have an iron purity of almost 100%. On the other hand, the iron particles and iron powder are finely divided into steel cans by a conventionally known shredder device in addition to scraps (granular or powdered iron, iron chips, etc.) generated when iron is produced, for example. What was crushed or cut and iron sand can be used. The specific gravity of the manufactured aluminum briquette can be increased by adding steel pellets, iron particles, and iron powder as the second raw material. In addition, when an aluminum briquette is thrown into hot metal or molten steel, iron particles and iron powder are melted and mixed in hot metal or molten steel.

  In addition, the aluminum ash and aluminum particles used as the second raw material are obtained after the valuable metal aluminum is separated and recovered by heating the aluminum dross generated in the process of melting aluminum during the manufacture of aluminum products (including recycling). It is a residue. And what screened this residue and sifted a thing with much aluminum is aluminum particle | grains, and the remainder is aluminum ash. The aluminum grains have an aluminum purity of about 25% to 80% and a total length of about 0.25 mm to 20 mm. Moreover, the aluminum purity of aluminum ash is about 10 to 70%. By adding aluminum particles or aluminum ash as the second raw material, the purity of the manufactured aluminum briquette can be changed.

  These second raw materials are materials for adjusting the weight and aluminum purity of the aluminum briquette to be produced, and are any one of steel pellets, iron grains, iron powder, aluminum grains, and aluminum ash, or how many A combination of these materials is stored in the second hopper 2 as the second raw material. In addition, it is preferable to use an aluminum grain as a 2nd raw material, and at least any one of a steel pellet, an iron grain, iron powder, and aluminum ash may be contained in the aluminum grain.

  The first hopper 1 and the second hopper 2 are connected to a mixing device 5 via a first conveyor 3 and a second conveyor 4, respectively. For example, a belt conveyor can be used for each of the conveyors 3 and 4. In the second step S2, the first raw material and the second raw material stored in the first hopper 1 and the second hopper 2 fall on the conveying surface upstream of the first conveying conveyor 3 and the second conveying conveyor 4, It is transported to the mixing device 5 on the downstream side by the first transporting conveyor 3 and the second transporting conveyor 4 and is put into the mixing device 5.

  Note that an appropriate amount of coke and / or lime may be added to the mixing device 5 as an additive as necessary. Coke and lime are high in calories burned and have a deoxidizing effect or a desulfurizing effect. By adding coke and / or lime as an additive, when aluminum briquettes are introduced into the molten iron or molten steel, the hot metal or molten steel temperature increases effectively from the height of the calories burned by the coke or lime, and the debris is removed. The effect of acid or desulfurization can be expected. In addition, additives necessary for the production of aluminum briquettes may be appropriately added to the mixing device 5.

  The third step S3 is a step of mixing and homogenizing the first raw material and the second raw material, and further the coke and / or lime additives. As the mixing device 5, a conventionally known device such as a stirring device can be used.

  The fourth step S4 is a step of molding the aluminum briquette of a predetermined shape by compressing and molding the mixed material mixed by the mixing device 5 into a lump shape (briquette) by the molding device 6. A conventionally known briquette machine can be used as the molding device 6. The briquette machine has a mold in which a plurality of recesses are arranged, and an aluminum briquette having a shape along the shape of the recesses is formed by pressing the mixed material filled in the recesses.

  The formed aluminum briquette has a shape in which a large number of pieces are connected via connecting portions. Therefore, after the fourth step S4, a step is performed in which the obtained aluminum briquette is cut into individual aluminum briquettes at the connecting portion by a cutting blade. The shape of the aluminum briquette is not particularly limited, and may be various shapes such as a circular column shape in a sectional view or an elliptical column shape, or a prism shape such as a triangular shape or a quadrangular shape in a sectional view.

  In the second step S2 described above, the aluminum purity of the manufactured aluminum briquette can be adjusted to a desired purity by adjusting the amounts of the first raw material and the second raw material charged into the mixing device 5, that is, the blending ratio. . For example, aluminum pellets (aluminum purity is about 95%) as the first raw material and aluminum particles (aluminum purity is, for example, 80%) as the second raw material are charged into the mixing device 5 so as to be blended at a ratio of 3: 1. Then, the aluminum purity of the manufactured aluminum briquette is as high as approximately 91.25% (= 95% × 3/4 + 80% × 1/4). Thus, by adding aluminum grains as the second raw material in addition to the aluminum pellets, an aluminum briquette having high purity and high specific gravity similar to that of a conventional deoxidized lump can be produced. In addition, the amount of aluminum pellets used can be reduced by adding aluminum grains. Therefore, the yield is improved and the aluminum briquette can be provided to the consumer at a low price. In addition, the aluminum purity of the aluminum briquette manufactured can be suitably adjusted by changing the mixture ratio of a 1st raw material and a 2nd raw material. When the aluminum purity of the manufactured aluminum briquette is in the range of 85% to 95%, it is possible to obtain a deoxidizing effect that is not inferior to the deoxidized lump. Moreover, even when aluminum scrap is used in place of aluminum pellets as the first raw material, the same effect can be obtained. The same effect can be obtained even when aluminum ash is used as the second raw material instead of aluminum grains.

  For customers who do not want a high-purity aluminum briquette, for example, aluminum scrap (aluminum purity is 80%, for example) as the first raw material, and steel pellets (aluminum purity is 0%) as the second raw material. When the mixing device 5 is mixed so as to have a ratio of 3: 2, the aluminum purity of the manufactured aluminum briquette is approximately 48% (= 80% × 3/5 + 0% × 2/5). In this case, the purity of the aluminum briquette is not high, but by adding steel pellets, it is possible to produce aluminum briquettes with a specific gravity as high as that of the deoxidized lump and to reduce the amount of aluminum pellets used by adding steel pellets. Manufacturing cost can be reduced. Therefore, the yield is improved and the aluminum briquette can be provided to the consumer at a low price. In addition, the aluminum purity of the aluminum briquette manufactured can be suitably adjusted by changing the mixture ratio of a 1st raw material and a 2nd raw material. Moreover, when it is desired to further increase the aluminum purity of the manufactured aluminum briquette, aluminum particles and aluminum ash can be further added to the steel pellets as the second raw material. Further, as the first raw material, aluminum pellets or aluminum scraps may be used instead of aluminum scraps, and aluminum pellets or aluminum scraps can be further added to the aluminum scraps.

  Thus, in this manufacturing method, according to a consumer's request, while selecting a 1st raw material and a 2nd raw material, adjusting a compounding ratio of the 1st raw material and a 2nd raw material, it meets a customer's request. Corresponding aluminum briquettes can be provided at a lower price than conventional aluminum briquettes.

  As means for enabling adjustment of the mixing ratio of the first raw material and the second raw material, the first transport conveyor 3 and the second transport conveyor 4 can be controlled independently of each other, and the first transport conveyor 3 and The conveyance speed of the second conveyor 4 is adjusted. Thereby, since the input amount of the 1st raw material and 2nd raw material thrown into the mixing apparatus 5 is adjusted, a compounding ratio can be adjusted.

  As described above, the present manufacturing method breaks the fixed idea of compressing and molding only the aluminum pellets of the conventional method, and by adding the second raw material such as aluminum particles to the first raw material such as aluminum pellets and compressing and molding. The aluminum briquette is comparable to the conventional aluminum briquette by the deoxidation effect, and the aluminum briquette can be manufactured at a lower cost than the conventional aluminum briquette. Such a technical idea has been found for the first time as a result of extensive studies by the present inventors, and the present invention is not completed based on the conventional method.

  In particular, by producing aluminum briquettes using aluminum grains generated when aluminum scrap is melted, such as when producing aluminum pellets, it is possible to further increase the purity and cost of the produced aluminum briquettes. However, the use of such aluminum grains is unique to the present invention, and the present invention has a remarkable effect in comparison with the conventional method due to this unique configuration.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning.

  For example, in the above-described embodiment, the first raw material and the second raw material are stored in the first hopper 1 and the second hopper 2, and the first raw material and the second raw material are mixed in the first transport conveyor 3 and the second transport conveyor 4, respectively. The first raw material and the second raw material are fed to the mixing device 5 without using the first hopper 1 and the second hopper 2, the first conveying means 3 and the second conveying means 4. The two materials may be mixed by charging. Further, as shown in FIG. 3, a large mixer type mixing device 7 is separately provided, and the first raw material and the second raw material are also introduced into the large mixer type mixing device 7 to mix both materials, and this mixed material is mixed. You may mix further with respect to the 1st raw material and 2nd raw material which are thrown into the mixing apparatus 5 from the 1st hopper 1 and the 2nd hopper 2 by throwing into the apparatus 5. FIG.

DESCRIPTION OF SYMBOLS 1 1st hopper 2 2nd hopper 3 1st conveyance conveyor 4 2nd conveyance conveyor 5 Mixing device 6 Molding device

Claims (6)

A manufacturing method for manufacturing aluminum briquettes used for hot metal and deoxidation of molten steel by mixing a plurality of raw materials,
A mixing step of mixing the first raw material and the second raw material with a mixing device;
A molding step of compression-molding the mixed material into a lump with a molding device,
The first raw material is composed of at least one selected from the group consisting of aluminum pellets, aluminum scrap, and aluminum scraps that have been crushed or cut,
The second raw material is at least one selected from the group consisting of steel pellets, iron particles and iron powder, and aluminum particles having a predetermined aluminum purity in 25% to 80% and predetermined in 10% to 70% And at least one selected from the group consisting of aluminum ash having an aluminum purity of
In the mixing step, the aluminum briquette manufacturing method in which the first raw material and the second raw material are selected and mixed so that an aluminum briquette having a desired aluminum purity and specific gravity is manufactured. It is a manufacturing method of the aluminum briquette of Claim 1,
Before the mixing step,
Storing the first raw material in a first hopper and storing the second raw material in a second hopper;
The manufacturing method of the aluminum briquette further provided with the input process which inputs said 1st raw material and said 2nd raw material into said mixing apparatus, respectively. In the charging step, the first raw material and the second raw material are respectively conveyed to the mixing device by the first conveying conveyor and the second conveying conveyor,
The manufacturing method of the aluminum briquette of Claim 1 which controls the feeding speed of the said 1st raw material and the said 2nd raw material which control the conveyance speed by the said 1st conveyance conveyor and the said 2nd conveyance conveyor, and is thrown into the said mixing apparatus. . The said aluminum scrap is a used aluminum can, The manufacturing method of the aluminum briquette in any one of Claims 1-3. The said aluminum particle is a manufacturing method of the aluminum briquette in any one of Claims 1-4 used what is generated at the time of aluminum melt | dissolution at the time of manufacturing aluminum products.   The method for producing an aluminum briquette according to any one of claims 1 to 5, wherein coke and / or lime is further added to the mixing device.

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