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Method for preparing cristobalite material by taking quartz crucible as raw material

A technology of quartz crucible and cristobalite, applied in glass manufacturing equipment, manufacturing tools, glass molding and other directions, can solve problems such as large energy consumption, high production cost, complex production process, etc., and achieve low production cost, simple production process, Highly economical effect

Inactive Publication Date: 2009-09-16
伍萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the existing technology adopts high-temperature calcination method, it needs to consume a lot of energy; and the existing cristobalite production technology usually directly uses natural quartz ore as raw material, and natural quartz ore contains associated minerals such as mica and feldspar, which must go through a certain process Only by removing these impurities can high-purity cristobalite be obtained
Due to the above factors, the production process of existing cristobalite products is complicated and the production cost is high

Method used

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  • Method for preparing cristobalite material by taking quartz crucible as raw material
  • Method for preparing cristobalite material by taking quartz crucible as raw material
  • Method for preparing cristobalite material by taking quartz crucible as raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Take out the used quartz ceramic crucible from the silicon material factory. This quartz ceramic crucible has been used for polysilicon melting. The temperature of polysilicon melting is 1500-1550 ° C. After the crucible is cooled, it is polished with a grinding wheel to remove surface impurities, and then rinsed with tap water. After drying, it is broken into cristobalite blocks of 10-50 mm. The composition (mass percentage) of the cristobalite material obtained by this method is shown in Table 1, which shows that this is a very high-purity quartz material. The X-ray powder diffraction pattern of cristobalite is shown in figure 1 , showing that the crystal phase composition in cristobalite material is mainly cristobalite phase.

[0017] Table 1

[0018] SiO 2 Al 2 o 3 Fe 2 o 3 Li 2 o Na 2 o K 2 o MgO TiO 2 CuO CaO >99.8 0.08 0.02 <0.01

Embodiment 2

[0020] Take out the used quartz ceramic crucible from silicon material factory, this quartz ceramic crucible has been used for polysilicon melting, the temperature of polysilicon melting is 1500~1550 ℃. After the crucible pieces are cooled, they are washed with tap water, and then soaked in hydrofluoric acid solution. The amount of hydrofluoric acid used in 1 ton of water is 200 liters. After soaking at room temperature for 2 days, the surface of the crucible piece changed from gray to white, and the crucible was taken out and cleaned with tap water. Break the washed white crucible piece, grind it with a ball mill with a corundum medium, and obtain cristobalite powder with a certain particle size distribution after the slurry is dried. The composition (mass percentage) of cristobalite powder obtained by this method is shown in Table 2. Due to the use of corundum media in the grinding process, the alumina content in the powder increased to some extent, but due to the treatment ...

Embodiment 3

[0024] Take out the used quartz ceramic crucible from the silicon material factory, this quartz ceramic crucible has been used for polysilicon melting, the temperature of polysilicon melting is 1500~1550 ℃. After the crucible pieces are cooled, they are washed with tap water, and then soaked in ammonium bifluoride solution. The amount of ammonium bifluoride in 1 ton of water is 100 kg. After immersing at room temperature for 2 days, the gray on the surface of the crucible piece turned white, and the crucible piece was taken out and cleaned with tap water. The dry process is adopted, that is, the dried white crucible pieces are crushed, and then ground in a corundum-lined and medium ball mill, and cristobalite powder with a certain particle size distribution is obtained after the product is classified.

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Abstract

The invention discloses a method for preparing a cristobalite material by taking a quartz crucible as a raw material, which adopts the quartz crucible subjected to high temperature treatment of 1,400 to 1,600 DEG C is subjected to surface impurity removal, crushing and grinding processes to obtain a high-purity cristobalite material of which the SiO2 content is more than 99 percent by weight. The method has the advantages of simple production process, low production cost, good product quality, energy conservation, environmental protection and the like.

Description

technical field [0001] The invention relates to the technical field of cristobalite materials, in particular to a method for preparing cristobalite materials using a quartz crucible as a raw material. Background technique [0002] The cristobalite material has the characteristics of extremely low linear expansion and internal stress, high temperature resistance, low radioactivity, and chemical corrosion resistance, and is widely used in the fields of coatings, rubber, inks, precision casting, and high-grade ceramics. [0003] Quartz crystals come in many variants, and they can be divided into 3 series, namely the quartz, tridymite and cristobalite series. Quartz crystal can undergo crystal transformation into cristobalite under high temperature conditions of 1400-1600 °C. The existing cristobalite production technology is usually obtained by calcining quartz crystals at high temperature, keeping warm at 1400-1600°C and then cooling, so it is also called high-temperature qua...

Claims

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Application Information

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IPC IPC(8): C01B33/12C03B20/00
Inventor 周永恒
Owner 伍萍
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