KR101332128B1 - The method of molded and molded for extracting metal silicon - Google Patents

Abstract

The present invention relates to a method for producing a silica sand molding and a molded article for loading the silica sand as a pre-treatment process for preparing the metal silicon by charging the silica sand in a high temperature reduction reactor, 3wt% to 6wt %, Liquid adhesive 20wt% to 45wt% and the remaining components include silica sand having a particle size distribution of 0.03mm to 0.7mm, or synthetic earth component 7wt% to 9wt%, liquid adhesive 20wt% to 45wt% And a silica sand having a particle size distribution of 0.6 mm to 1.1 mm as the remaining components, or 10 wt% to 15 wt% of synthetic soil components, 20 wt% to 45 wt% of liquid adhesive, and 0.8 mm to 2.3 particle sizes with the remaining components. Characterized in the metal silicon silica sand molding including the silica sand having a distribution of mm, and the present invention is also a method for producing a silica sand molding for metal silicon extraction, synthetic earth component Mixing step of mixing the liquid adhesive and the silica sand: Pressing step to increase the density by reducing the pores by applying pressure to the mixture formed in the mixing step: Forming to prepare the mixture through the pressing step into a lump of a constant size Step: and drying step of drying the mass structure formed in the molding step: characterized in that the manufacturing method of the silica sand molding for metal silicon extraction.

Description

Silica molded material for metal silicon extraction and its manufacturing method {The method of molded and molded for extracting metal silicon}

The present invention relates to a technique for manufacturing metal silicon from silica sand, and more particularly, a silica sand molded product for charging silicon silica into a reduction reactor as a pretreatment process for preparing metal silicon by charging silica sand into a high temperature reduction reactor. It relates to a method for producing a molding.

Silicon is one of the most widely distributed elements in nature. Silicon is a semimetal element between metal and nonmetal. In nature, silicon exists mainly in the form of silicon oxide and silicate.

The first silicon was obtained in 1811 by Kerinochar and Cedar rudder, adding silicon as an oxide. The property of silicon was used by Berzelius in 1823 as the name Si.

In 1855, Deweili invented crystalline silicon of gray metallic sheen.

High purity silicon was invented by Lion (D.w.lyon) through the method of SiCd₄ + 2Zn = 2ZnCl₂ + Si.

In 1869, when Dmitry Ivanovich Mendeleev raised the periodicity of the element, the atomic number of silicon belonged to group 14, Part IV A. The carbon reduction method of silicon scaled-up in modern industry was invented in the early 20th century and is less than 100 years old. Silicon content of silicon produced by the carbon reduction method using silica and a carbon reducing agent is referred to as '99 silicon 'as a product of more than 99%, and in the English, it is referred to as' silicon silicon' and 'crystalline silicon' in Russian.

High-purity metal silicon can be produced through a series of refining processes to produce single crystal silicon (99.99% silicon). It is used in the electronics industry, and the demand for 99 silicon in domestic and overseas markets is gradually increasing.

With the advance of high-tech technology and the development of the global economy, the scope of use of silicon is also becoming widespread, and the demand is gradually increasing.

Prior to the twentieth century, France, the United States, Japan, Italy, and the former Soviet Union subsequently built thousands of kilowatt single- and three-phase electric furnaces and refined metal silicon in the furnace using carbon reduction.

The reduction process of metal silicon by the carbon reduction method is represented by the following formula.

That is, metal silicon may be obtained by a reaction such as SiO 2 + 2C ----> Si + 2CO. Such a reduction reaction is carried out in a high temperature reduction reaction furnace as an endothermic reaction. Such a carbon reduction method is disclosed in Korean Patent Publication No. 2010-0043092 (published: April 27, 2010).

Conventionally, silica is used as a raw material of metal silicon as disclosed in Korean Patent Laid-Open No. 2010-0043092. In general, the silica is finely crushed and then mixed with necessary raw materials such as activated carbon to heat to an air temperature in an electric furnace equipped with carbon rods to cause a reduction reaction. By the way, quartz (quartz), which is a raw material of metal silicon, is widely distributed on the earth, but as a result of mining in large quantities since the 60s, the mining conditions are becoming increasingly difficult.

Therefore, related industries are exploring materials other than silica as a raw material of metal silicon.

Silica sand contains almost the same ingredients as silica, making it a good substitute for silica. The silica is high in strength and there is no fear of breakage in the carbon reduction process, but the silica is not in the form of agglomeration, so it is difficult to be charged into the carbon reduction furnace.

If the silica sand lumps charged in the carbon reduction furnace are damaged, there is a problem that the reduction reaction does not occur properly because heat transfer or gas circulation is blocked. Therefore, the silica sand lumps to be charged into the carbon reduction furnace must have sufficient strength.

However, silica is a sand component, it is difficult to form a lump like silica.

In order to cause the reduction by charging the silica sand in the reduction reactor, it is necessary to form a lump structure like the conventional silica. However, agglomerate structures such as silica are not currently developed using silica sand.

Disclosure of Invention An object of the present invention is to provide a metal silicon material which can be substituted for silica by using sand sand, which is devised to solve the above problems.

In order to achieve the above object, the silica sand molding for extracting metal silicon according to an embodiment of the present invention may include 3 wt% to 6 wt% of synthetic earth component, 20 wt% to 45 wt% of liquid adhesive, and a particle size of 0.03 mm. It is characteristic in that it contains the silica sand which has a distribution of 0.7 mm.

Meanwhile, in order to achieve the above object, the silica sand molding for extracting metal silicon according to another embodiment of the present invention has a particle size of 7wt% to 9wt% of synthetic earth component, 20wt% to 45wt% of liquid adhesive, and the other components. It is characteristic in that it contains the silica sand which has a distribution of mm-1.1 mm.

On the other hand, in order to achieve the above object, the metal silicon extract silica sand molding according to another embodiment of the present invention, the synthetic earth component 10wt% to 15wt%, the liquid adhesive 20wt% to 45wt% and the particle size as the remaining components It is characteristic in that it contains the silica sand which has a distribution of 0.8 mm-2.3 mm.

The liquid adhesive is preferably a mixture of starch powder and water.

A method of manufacturing the above-mentioned metal silicon extraction silica sand molding, the mixing step of mixing the synthetic earth component, the liquid adhesive and the silica sand: pressurizing to increase the density by reducing the pores by applying pressure to the mixture formed in the mixing step Step: Forming step of producing a mixture of the pressurized step into a certain size of the mass: Drying step of drying the mass structure formed in the forming step: Heat treatment step to increase the strength of the dried molding: There is this.

The form of the lump formed in the forming step is preferably any one of spherical, cylindrical, briquettes, gravel form.

The apparent density of the mass structure formed after the drying step is preferably 65% to 95%.

The drying method used in the drying step is preferably any one of heat drying, blowing drying, natural drying.

The heating method used in the heat treatment step is preferably any one of gas, electricity, coal, charcoal.

The silica sand molding for extracting metal silicon according to the present invention and a method of manufacturing the molded article can be manufactured using metal sand using sand sand, which is readily available on the earth, instead of silica, thereby securing raw materials at an economic cost and providing natural Provide the effect of protecting the environment.

1 is a table showing the components of the silica sand molding for metal silicon extraction according to the present invention.
Figure 2 is a process chart of a method for producing a silica sand molding for metal silicon extraction according to the present invention.
3 is a photograph of a silica sand molding for metal silicon extraction according to the present invention.
4 is a photograph of a state in which the silica sand molding for metal silicon extraction shown in FIG. 3 is loaded in a heat treatment furnace.
FIG. 5 is a photograph showing a state in which the silica sand molding for metal silicon extraction shown in FIG. 4 is heated to 1000 to 1300 ° C., and then heat-treated to room temperature.

Hereinafter, preferred embodiments of the present invention will be described in detail.

1 is a table showing the components of the silica sand molding for metal silicon extraction according to the present invention. Figure 2 is a process chart of a method for producing a silica sand molding for metal silicon extraction according to the present invention. 3 is a photograph of a silica sand molding for metal silicon extraction according to the present invention. 4 is a photograph of a state in which the silica sand molding for metal silicon extraction shown in FIG. 3 is loaded in a heat treatment furnace. FIG. 5 is a photograph showing a state in which the silica sand molding for metal silicon extraction shown in FIG. 4 is heated to 1000 to 1300 ° C., and then heat-treated to room temperature.

<First Embodiment>

According to the first embodiment of the present invention, the metal silicon extraction silica sand molding has a distribution of particle size of 0.03 mm to 0.7 mm as 3 to 6 wt% of synthetic earth component, 20 to 45 wt% of liquid adhesive, and the remaining components. Contains silica sand.

The synthetic soil components are mixed to maintain the bond between the silica sand particles during the reduction reaction of the molding charged in the carbon reduction furnace. The weight of the synthetic soil component varies depending on the size of the silica sand particles. Kaolin, loess, etc. may be employed as the synthetic soil component.

In the present embodiment, when the content of the synthetic earth component is less than 3wt%, when the molding is reduced in the carbon reduction furnace, the bonding force between the silica sand particles is reduced, so that the molding is preliminarily powdered so that heat transfer is not performed properly around the silica sand particles. The circulation of the reducing gas is blocked, making the carbon reduction reaction difficult.

When the content of the synthetic soil component is more than 6wt%, the molding can maintain sufficient strength when the reduction reaction occurs in the carbon reduction furnace, but the economic loss is caused by mixing more than the required synthetic soil components.

Synthetic earth component in the present invention is a clay mineral combined in a broad sense as the contents of kaolinite minerals such as kaolinite, dickite, halloysite, montmorillonite ), Bentonite, acidic clay, etc., and kaolin, refractory clay, and the like.

In the present embodiment, the liquid adhesive used starch powder mixed with starch powder and water. The starch paste is commonly available in the general market, for example, starch paste may be prepared by adding 40 wt% to 80 wt% of water to 100 wt% of starch powder.

When the liquid adhesive is contained in less than 20wt% there is a problem that can not maintain sufficient strength because silica and clay are not properly bonded at room temperature. On the other hand, when the liquid adhesive is more than 45wt% there is a problem that the viscosity of the mixture in the state in which the silica sand and the synthetic soil is combined at room temperature is too small to flow down to maintain the form.

The silica sand is a mineral serving as a raw material of metal silicon. Generally, sand sand may be used as the silica sand. Particles of the silica sand may be variously distributed depending on the weathering degree of the silica sand. In this embodiment, the silica sand particles are limited to 0.03 mm to 0.7 mm.

Depending on the size of the silica sand particles, the content of the synthetic earth component to be added and the content of the liquid adhesive will be different. Therefore, limiting the size of the silica sand particles to 0.03 mm to 0.7 mm as in this embodiment is determined by the content of the synthetic earth component to be mixed and the content of the liquid adhesive.

<Second Embodiment>

According to the second embodiment of the present invention, the silicon silicon extract for silicon silicon extract has a distribution of 7wt% to 9wt% of synthetic components, 20wt% to 45wt% of liquid adhesive, and a particle size of 0.6mm to 1.1mm as the remaining components. Contains silica sand.

The synthetic soil components are mixed to maintain the bond between the silica sand particles during the reduction reaction of the pressurized molding in the carbon reduction furnace. The weight of the synthetic soil component varies depending on the size of the silica sand particles. Kaolin, loess, etc. may be employed as the synthetic soil component.

In the present embodiment, when the content of the synthetic soil component is less than 7wt%, when the molding is reduced in the carbon reduction furnace, the bonding force between the silica sand particles is reduced, so that the molding is powdered early so that heat transfer is not performed properly around the silica sand particles. The circulation of the reducing gas is blocked, making the carbon reduction reaction difficult.

When the content of the synthetic earth component is more than 9wt%, the molded product can maintain sufficient strength when the reduction reaction occurs in the carbon reduction furnace, but causes more economic loss by mixing more synthetic earth components than necessary.

In the present embodiment, the liquid adhesive used starch powder mixed with starch powder and water. For detailed information on the synthetic soil component, reference may be made to the description regarding the first embodiment. The starch paste is commonly available in the general market, for example, starch paste may be prepared by adding 40 wt% to 80 wt% of water to 100 wt% of starch powder.

When the liquid adhesive is contained in less than 20wt% there is a problem that can not maintain sufficient strength because silica and clay are not properly bonded at room temperature. On the other hand, when the liquid adhesive is more than 45wt% there is a problem that the viscosity of the mixture in the state in which the silica sand and the synthetic soil is combined at room temperature is too small to flow down to maintain the form.

The silica sand is a mineral serving as a raw material of metal silicon. Generally, sand sand may be used as the silica sand. Particles of the silica sand may be variously distributed depending on the weathering degree of the silica sand. In this embodiment, the silica sand particles are limited to 0.6 mm to 1.1 mm. Depending on the size of the silica sand particles, the content of the synthetic earth component to be added and the content of the liquid adhesive will be different. Therefore, limiting the size of the silica sand particles to 0.6 mm to 1.1 mm as in this embodiment is determined by the content of the synthetic soil component to be mixed and the content of the liquid adhesive.

<Third Embodiment>

According to the third embodiment of the present invention, the metal silicon extraction silica sand molding has a distribution of 10 wt% to 15 wt% of the synthetic content component, 20 wt% to 45 wt% of the liquid adhesive, and a particle size of 0.8 mm to 2.3 mm as the remaining components. Contains silica sand.

The synthetic soil components are mixed to maintain the bond between the silica sand particles during the reduction reaction of the pressurized molding in the carbon reduction furnace. The weight of the synthetic soil component varies depending on the size of the silica sand particles. Kaolin, loess, etc. may be employed as the synthetic soil component.

In the present embodiment, when the content of the synthetic earth component is less than 10wt%, when the molding is reduced in the carbon reduction furnace, the bonding force between the silica sand particles is reduced, and the molding is preliminarily powdered so that heat transfer is not performed properly around the silica sand particles. The circulation of the reducing gas is blocked, making the carbon reduction reaction difficult.

When the content of the synthetic soil component is more than 15wt%, the molded product can maintain sufficient strength when the reduction reaction occurs in the carbon reduction furnace, but the economic loss is caused by mixing more synthetic soil components than necessary.

In the present embodiment, the liquid adhesive used starch powder mixed with starch powder and water. For detailed information on the synthetic soil component, reference may be made to the description regarding the first embodiment. In the present embodiment, the liquid adhesive used starch powder containing starch powder and water.

The starch paste is commonly available in the general market, for example, starch paste may be prepared by adding 40 wt% to 80 wt% of water to 100 wt% of starch powder.

When the liquid adhesive is contained in less than 20wt% there is a problem that can not maintain sufficient strength because silica and clay are not properly bonded at room temperature. On the other hand, when the liquid adhesive is more than 45wt% there is a problem that the viscosity of the mixture in the state in which the silica sand and the synthetic soil is combined at room temperature is too small to flow down to maintain the form.

The silica sand is a mineral serving as a raw material of metal silicon. Generally, sand sand may be used as the silica sand. Particles of the silica sand may be variously distributed depending on the weathering degree of the silica sand. In this embodiment, the silica sand particles are limited to 0.8 mm to 2.3 mm.

Depending on the size of the silica sand particles, the content of the synthetic earth component to be added and the content of the liquid adhesive will be different. Therefore, limiting the size of the silica sand particles to 0.8 mm to 2.3 mm as in this embodiment is determined by the content of the synthetic earth component to be mixed and the content of the liquid adhesive.

Now, the manufacturing method of the silica sand molding for metal silicon extraction which consists of such a component is demonstrated.

The method for producing a silicon sand molding for extracting silicon according to the present invention includes a mixing step (S1), a pressing step (S2), a forming step (S3), a drying step (S4), and a heat treatment step (S5).

In the mixing step (S1), the synthetic earth component, the liquid adhesive and the silica sand are mixed at a ratio of the content as described above. Mixing in the mixing step (S1) may be performed using a stirrer. The mixing in the mixing step (S1) is preferably made at room temperature. The stirring time in the mixing step (S1) is preferably about 3 minutes to 10 minutes.

In the pressing step (S2) is applied to the mixture formed in the mixing step (S1) to reduce the pores. The pressing step (S2) is to reduce the pores present in the mixture by using an extruder (wheeling machine).

In general, it is practically impossible to completely remove the pores in the pressing step (S2).

In the forming step (S3) to produce a mixture of the pressing step (S2) into a lump of a constant size. The shape of the mass produced in the forming step (S3) may be, for example, spherical, cylindrical, briquettes, gravel form, the size of the diameter is about 30 ~ 60㎜.

In the drying step (S4) to dry the lump structure formed in the molding step (S3). As the drying method in the drying step (S4), for example, various methods such as heating drying, blowing drying, and natural drying may be employed. After passing through the drying step (S4) the apparent density of the molded product was to be 65% to 95%. The apparent density is a percentage based on the surface area of the moldings as a denominator and the molecular weight of the pores distributed on the surface of the moldings. When the apparent density of the molding is less than 65%, when the molding is heated to a high temperature in a carbon reduction furnace, pores are expanded to break the molding. If the apparent density of the molding exceeds 95%, there is no problem in reality, but it is difficult to remove 100% of the pores in the pressing step (S2).

In the heat treatment step (S5) to charge the molded product after the drying step (S4) in a heating furnace to heat to 1000 ~ 1300 ℃. The heating furnace used at this time can be employ | adopted as a gas, an electric furnace, etc.

The silica sand molding for metal silicon extraction manufactured by such a component and a manufacturing method is economical because it is possible to use metal sand, for example, by using sand sand which is readily available on earth instead of silica. It provides the cost of securing raw materials and protecting the natural environment.

As a result of the test, it can be seen that the silica sand molded product can be a good material to replace the silica by maintaining its form even at a temperature of 1300 ° C. higher than the reduction reaction temperature of the carbon reduction furnace.

As described above, the silica sand molding for extracting the metal silicon and the method for manufacturing the molding according to the present invention enable to manufacture metal silicon using sand sand in the form of sand available on the earth instead of silica, thereby securing raw materials at economic cost. Provides the effect of protecting the natural environment.

The present invention has been described above with reference to preferred embodiments, but the present invention is not limited to the examples, and various forms of embodiments may be embodied without departing from the technical spirit of the present invention.

S1: Mixing Step S2: Pressing Step
S3: forming step S4: drying step
S5: heat treatment step

Claims (9)

3 to 6 wt% of clay mineral, 20 to 45 wt% of liquid adhesive and silica sand having a particle size distribution of 0.03 mm to 0.7 mm as the remaining components. The silica sand molding for metal silicon extraction, characterized in that it comprises a clay mineral 7wt% to 9wt%, liquid adhesive 20wt% to 45wt% and the silica sand having a particle size distribution of 0.6mm to 1.1mm as the remaining components. 10 to 15 wt% clay mineral, 20 wt% to 45 wt% of a liquid adhesive and silica sand having a particle size distribution of 0.8 mm to 2.3 mm as the remaining components. In any one of claims 1 to 3
The liquid adhesive is a silica sand molding for metal silicon extraction, characterized in that the mixture of starch powder and water. As a method of manufacturing a silica sand molding for metal silicon extraction,
Mix clay mineral, liquid adhesive and silica sand,
3wt% to 6wt% of clay mineral, 20wt% to 45wt% of liquid adhesive and the other components are mixed with silica having a particle size of 0.03mm to 0.7mm
7 wt% to 9 wt% of clay mineral, 20 wt% to 45 wt% of liquid adhesive, and the other components of the silica sand having a distribution of 0.6 mm to 1.1 mm in particle size, or
Mixing the clay mineral having a distribution of 0.8 mm to 2.3 mm in particle size with 10 wt% to 15 wt% of clay mineral, 20 wt% to 45 wt% of the liquid adhesive;
A pressurizing step of increasing density by applying pressure to the mixture formed in the mixing step to reduce pores;
Forming step of producing a mixture of a predetermined size of the mixture passed through the pressing step;
Drying step of drying the mass structure formed in the forming step; And
The method of manufacturing a silicon silica extract for metal silicon extraction comprising a; step of charging the heat-treated by molding the molded product through the drying step. The method of claim 5, wherein the lump formed in the forming step is a spherical, cylindrical, briquette, gravel form of any one of the method for producing a metal silicon extraction silica sand molded product. delete The method of claim 5, wherein the drying method used in the drying step is any one of heating drying, blowing drying, and natural drying is adopted. The method of claim 5, wherein any one of gas, electric, coal, and charcoal-fired furnaces is used to heat-treat the mass formed after the drying step.

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