KR970008735B1 - Process for the preparation of burned material using slug - Google Patents

Abstract

Employing Water granulation slag, which is by-product produced from shaft furnace operation in a steel manufacture process, bentonite and water glass as raw materials, high-strength sintered body is formed that is useful as construction materials and ceramic materials. 50 to 70 wt% of water granulation slag and 30 to 50 wt% of bentonite are pulverized such that passing portions under 200 mesh sieve are not less than 95%, and dried. Water glass comprising 35 to 38 wt% of silica, 17 to 18 wt% of sodium oxide and the remainder water added thereto in an amount of from 10 to 15 wt% as based on total green body, pressed, and sintered at a temperature of 1050 to 1200 deg. C to produce the high-strength sintered body.

Description

High strength fired body manufacturing method using crushed slag

The present invention relates to a method for manufacturing a fired body used as a building material and a ceramics material, and more particularly, a method for manufacturing a high-strength fired body by using crushed slag, bentonite and water glass as by-products generated during blast furnace operation in a steelmaking process It is about.

In general, blast furnace slag generated during blast furnace operation has been used with limited additives such as cement additives, crushed aggregates, etc., but recently, it has been used as a ceramic material such as building materials and insulation materials. Blast furnace slag is made by quenching molten slag with water, and it is a slag with large surface energy to achieve stable structure because its physical property is easily changed even in small temperature change and it is amorphous.

On the other hand, in order to manufacture the fired body for the ceramic material, the selection and composition of the material is important, and conventionally, wollastonite, talc and dialysis are used. The reason for using such a material is that the properties of the base are linearly thermally expandable. This is because it is very safe against thermal shock if it has low hydration expandability and low heat loss, and also has low shrinkage even when the base is dried and hardly shrinkage when firing.

As a method for producing the fired body, a tile raw material manufacturing method (Japanese Patent Laid-Open No. 57-179068) which finely grinds blast furnace slag and adds 20 to 50% of clay, 80 to 250 mesh to 95 to 70% by weight of clay Blast furnace slag is kneaded at 5 to 30% by weight (Japanese Patent Laid-Open No. 53-133210) and blast furnace slag is predominantly prepared by adding caking additives to produce ceramic materials such as tiles. In this case, there is disclosed a method using a crystalline or heat-treated slag (Japanese Patent Laid-Open No. 50-43110) through heat treatment and fixing.

On the other hand, the inventors of the present invention to limit the present invention through research and experiment in order to utilize the blast furnace slag generated in the steel mill, the object of the present invention is to use a method of producing a high-strength plastic body having excellent surface appearance by using the hydrous slag To provide.

According to the present invention, in the production of a fired body using hydrolyzed slag, bentonite, and mulle glass as raw materials, 95% or more of the raw material comprising 50 to 70 wt% of the hydrolyzed slag and 30 to 50 wt% of bentonite is 95% or more. Grinding to dry and then preparing a raw material for raw materials; Adding 15-15% by weight of mule glass to the substrate, based on the weight of the entire body containing mulle glass, and then preparing a molded body by a conventional pressure molding method; And firing the molded body by heating at a temperature of 1050 to 1200 ° C .;

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The hydrolyzed slag and bentonite used as raw materials of the present invention are conventional and have a chemical composition as shown in Table 1 below.

TABLE 1

Among the components used as a raw material of the fired body, the hydrous slag has a high surface energy and is highly reactive as an amorphous phase in an unstable state in which physical properties change even at a small temperature change.

That is, the point where sintering is accelerated | stimulated by diffusion is applied to manufacture high strength sintered compact.

In addition, by the Na ₂ O and K ₂ O components contained in the bentonite component, the sintering temperature is lowered at the time of solid firing, the sintering is promoted, the strength is improved, and the low temperature rapid firing is possible.

When the added amount of bentonite mixed with the hydrolyzed slag is 30% by weight or less, it is difficult to maintain a degree of ginger that can be handled after molding, and it becomes difficult to manufacture a high-strength plastic body, and when the added amount is 50% by weight or more, the plastic shrinkage rate It is preferable to mix 30-50% by weight of bentonite and 50-70% by weight of slag slag due to the increase in the density of the compacted plastic body, but partial warpage and deformation occur, and the color of the body becomes dark brown. Do.

On the other hand, when manufacturing the raw material for drying the raw material composed of the hydrolyzed slag and bentonite, when the particle size of the raw material is made large, the hydrolyzed slag and bentonite are not uniformly mixed, the moldability is poor, cracking during firing In addition, the manufactured product may also be cracked, so that the mixed raw material is pulverized so that the content of the passage of 200 mesh is 95% or more, it is preferable to prepare the raw material for the raw material.

By adding mule glass to the dried raw material, the mule glass serves to promote the sintering of bentonite and crushed slag during heating and firing to produce a high-strength calcined body.

If the added amount of mul glass to the base material based on the total body weight containing mulle glass is less than 10% by weight, it is not possible to obtain a great effect, when the weight of more than 15% by weight, the strength of the fired body is improved but the underfiring occurs Since the shape is deformed or warped, it is preferable to add 10-15% by weight of mule glass to the substrate.

Mule glass used in the invention is composed of 35 to 38% by weight of SiO ₂ , 17-18% Na ₂ O and the balance H ₂ O, it is difficult to mold when the concentration of the mul glass is too low, when the concentration is thick Since it is difficult to mix the raw material material and the mul glass, a low concentration mul glass (hereinafter referred to as "mule glass (20%)") is used, in which the gel phase composed of the composition is composed of 20% by weight of mule glass and 80% by weight of mule.

Thereafter, as described above, the glass to which the mul glass is added is molded by a conventional caustic molding method to produce a molded body.

That is, the crushed slag and bentonite raw materials are blended in the above composition, charged in an indel, and mixed and pulverized for a long time to prepare respective raw materials for holding. At this time, the particle size of the raw material is to be passed through 200 mesh 95% by weight or more. Thereafter, the raw material is dried to prepare a raw material, followed by addition and mixing of mulberry (20%), and then a molded product is manufactured by a conventional pressure molding method.

As described above, the molded body is prepared and then calcined by heating at a temperature of 1050-1200 ° C. to produce a fired body. In the case where the firing temperature is 1050 ° C. or less, a plastic body having a high strength bending strength is not formed. When the firing temperature is 1200 ° C. or more, a high strength plastic body may be manufactured, but the original phenomenon may be maintained due to deformation and bending due to uneven plastic shrinkage. It is difficult and impossible to produce the desired shape. Therefore, it is preferable to bake at 1050-1200 degreeC.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described.

Example 1

In this embodiment, to test the production of high-strength calcined slag using hydroslag slag, bentonite and mule glass (20%), the composition of hydroslag slag and bentonite is changed as shown in Table 2 based on the low weight of the composition. The raw materials for the production of the fired bodies of Examples 1 and 2 and Inventive Examples 1 to 3 were blended and pulverized to 200% or more by passing through 200 mesh, and dried to prepare fired body raw materials. The composition was shown.

TABLE 2

Mule glass (20%) was added to the dried calcined raw material by pressing 10% and dried at 110 ° C. in a dryer. After the heat treatment at a firing temperature of 1100 ℃ and cooled to prepare a specimen. The bending strength of each specimen was measured by a three-point bending test, and the bending and deformation states were visually observed and the results are shown in Table 3 below.

TABLE 3

As shown in Table 3, the comparative example 1 has a high strength of 360kgf / ㎠, but does not have a value as a product due to the warpage caused by the underfiring, in the case of the comparative example 2 80% of the base material except glass Although the normal shape is maintained well as the hydrous slag, the high strength property of more than 300kgf / cm 2 did not show the bending strength. On the contrary, in the case of the inventions 1, 2 and 3, not only the appearance was good but also the bending strength of 300 kgf / cm 2 or more.

Example 2

This example is to measure the change in strength and appearance of the addition amount of the mule glass (20%) by adding 5%, 10%, 20% of mule glass to the raw material composition of Examples 1, 2 and 3, respectively, The molded article was produced by pressing. Thereafter, the molded body was dried at 110 ° C. using a drier, heat treated at a firing temperature of 1100 ° C., and cooled to prepare a specimen. Each specimen was tested for bending strength and appearance in the same manner as in Example 1, and the results are shown in Table 4 below.

TABLE 4

As shown in Table 4, when 5% by weight of mulberry glass was added to the raw material of the invention examples 1,2,3, the appearance was good, but in all three cases, the low strength was less than 300kgf / cm2. When 20% by weight of mul glass is added, a high strength plastic body is manufactured with a bending strength of 370 kgf / cm2 or more compared to 5% by weight of mul glass, but the shape is deformed due to uneven shrinkage during firing, thereby indicating a value as a normal product. It becomes a defective product. On the contrary, when 10 and 15% by weight of each glass was added, not only the appearance was good but the bending strength of 300 kgf / cm 2 or more showed high strength.

Therefore, according to the embodiment of the present invention, in order to manufacture a fired body having a good shape and maintaining high strength, it is preferable to add to the raw material holder of the present invention limited to 10-15% by weight.

Example 3

This Example is to measure the change in appearance and strength according to the changes in the firing temperature conditions 10% by weight of mul glass (20%) was added to the raw material composition of the invention examples 1,2,3, and the molded article was produced by pressing The fired bodies were prepared by heat treatment at firing temperatures of 1000 ° C., 1050 ° C., 1100 ° C., 1150 ° C., 1200 ° C., and 1250 ° C., respectively. Each fired body was subjected to bending strength and appearance inspection in the same manner as in Example 1, and the results are shown in Table 5 below.

TABLE 5

As shown in <Table 5>, when fired at 1000 ° C., the appearance is good but the strength of the fired body is low. When fired at 1250 ° C., a high-strength fired body having a bending strength of 380 kgf / cm 2 or more is produced, but is uneven during firing. One shrinkage deforms the shape, resulting in a defective product rather than a normal product. On the other hand, when fired at 1050, 1100, 1150 and 1200 ℃, not only the appearance was good but also all showed a high strength of more than 300kgf / ㎠.

As can be seen from the results of this embodiment, in order to manufacture a fired body having good shape and high strength bending strength, 10-15% by weight of mul glass was added to the raw material of the invention of the present invention, and 1050-1200 ° C. It is preferable to bake by heating at a temperature.

As described above, when the molded article is manufactured by the method of the present invention, the molded article having excellent appearance and improved strength, which is used in various industries such as building materials and ceramic materials, can be produced as well as by-products generated in the steelmaking process. The blast furnace slag can be utilized and the additional branches are high.

Claims (2)

In manufacturing a fired body using hydrolyzed slag, bentonite and mulle glass as raw materials, the raw material consisting of 50 to 70 wt% of the hydrolyzed slag and 30 to 50 wt% of bentonite is pulverized so that the passage amount of 200 mesh is 95% or more and then dried. To prepare a raw material for the raw material; Adding 15-15% by weight of mule glass to the substrate, based on the weight of the entire body containing mullet, followed by mixing to prepare a molded body by a conventional pressure molding method; And firing the molded body by heating at a temperature of 1050 ~ 1200 ℃; High-strength plastic body manufacturing method using a hydroslag slag characterized in that consisting of. According to claim 1, The mul glass is a low concentration of mule glass composed of 20% by weight and 80% by weight of mule glass composed of 35 to 38% by weight of SiO ₂ , 17-18% by weight of Na ₂ O and the balance H ₂ O A method for producing a high strength fired body using crushed slag, characterized in that.