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Method for preparing cristobalite micropowder from melted quartz crucibles used during polycrystalline silicon ingot casting

A technology of fused silica and cristobalite, applied in the field of preparation of cristobalite micropowder, can solve the problems of long production time, high labor cost, inability to meet the requirements, and achieve the effects of improving efficiency, reducing labor cost and solving waste of resources.

Inactive Publication Date: 2017-11-07
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this method mainly utilizes artificial sandblasting or hydrofluoric acid soaking for physical or chemical impurity removal, its labor cost is relatively high or production time-consuming (soaking for 2 days) is relatively long. high, low efficiency
In addition, in the grinding process, the ultra-fine powder technology is not used for ball milling and ultra-fine classification, and the particle size distribution of the product is wide. Compared with the actual commercial cristobalite powder, it cannot meet the needs of specific customers.

Method used

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  • Method for preparing cristobalite micropowder from melted quartz crucibles used during polycrystalline silicon ingot casting
  • Method for preparing cristobalite micropowder from melted quartz crucibles used during polycrystalline silicon ingot casting

Examples

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Effect test

Embodiment 1

[0025] Cristobalite micropowder, the raw material is fused silica crucible, through physical treatment, the particle size distribution is 800 mesh, SiO 2 Ultrafine cristobalite powder with a content greater than 99.2%.

[0026] refer to figure 1 , a process for preparing ultrafine quartz powder using a fused silica crucible after polysilicon ingot casting in this embodiment includes the following steps:

[0027] 1. Use an industrial-grade impact drill to break a large piece of fused silica crucible into 15-30cm crucible fragments;

[0028] 2. Put the crucible fragments into the water pool and soak for 12 hours;

[0029] 3. Put the crucible fragments into the ultrasonic cleaner for 30 minutes;

[0030] 4. Put the crucible fragments into the compound pendulum jaw crusher for secondary fine crushing, and crush them into crucible fragments with a particle size of 2 to 5 cm;

[0031] 5. Using ultra-fine powder technology, the crucible fragments are ground into cristobalite powd...

Embodiment 2

[0034] Ultrafine cristobalite powder, the raw material is fused silica crucible, through physical treatment, the particle size distribution is 2000 mesh, SiO 2 Ultrafine cristobalite powder with a content greater than 99.5%.

[0035] 1. Use an industrial-grade industrial-grade impact drill pick to break a large piece of fused silica crucible into 15-30cm crucible fragments;

[0036] 2. Soak the crucible fragments in weak acid solution for 6 hours;

[0037] 3. Put the crucible fragments into the ultrasonic cleaner for 30 minutes;

[0038] 4. Put the crucible fragments into the compound pendulum jaw crusher for secondary fine crushing, and crush them into crucible fragments with a particle size of 2 to 5 cm;

[0039] 5. Using ultra-fine powder technology, the crucible fragments are ground into cristobalite powder with a particle size of less than 10 microns in a built-in reverse rotary ball mill;

[0040] 6. Use an ultra-fine powder classifier to classify the quartz powder, a...

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Abstract

The invention belongs to the technical field of energy conservation, environmental protection and resource recycling and relates to a method for preparing cristobalite micropowder from melted quartz crucibles used during polycrystalline silicon ingot casting. The method specifically comprises steps as follows: 1) the crucibles are primarily crushed; 2) crushed crucible fragments are put into water or weak acid to be soaked and primarily washed; 3) the soaked crucible fragments are subjected to ultrasonic cleaning; 4) a jaw crusher is used for secondary crushing; 5) an internal type inverted rotary ball mill is used for ball milling the crucible fragments; 6) cristobalite micropowder is subjected to ultrafine gradation, that is, different grades of cristobalite micropowder products with the particle size ranging from 800 meshes to 3,000 meshes are obtained. The melted quartz crucible used during polycrystalline silicon ingot casing is used effectively, the cost of polycrystalline production enterprises in treatment of the waste quartz crucibles is saved, the cristobalite micropowder is prepared from the waste quartz crucibles, resource recycling is realized, and the method accords with the development trend of current cyclic economy and has significant economic and social value.

Description

technical field [0001] The invention relates to a method for preparing cristobalite micropowder, in particular to a method for preparing cristobalite micropowder using a fused silica crucible. Background technique [0002] Cristobalite micropowder is a hard, wear-resistant and chemically stable metallurgical raw material. It has excellent acid and alkali resistance, wear resistance, weather resistance, insulation and low thermal expansion coefficient. The refractive index is close to PE, PP and other resins. the refractive index. Cristobalite micropowder is widely used in construction, chemical industry, machinery, electronics, coatings and other fields, and is mainly used in ink, electrophoretic paint, matting agent, electronic epoxy packaging, powder coating, electronic chip grinding and polishing and other industries. [0003] At present, the preparation of cristobalite powder is mainly made by firing natural vein quartz at a high temperature of 1500°C through a special ...

Claims

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Application Information

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IPC IPC(8): C01B33/12B02C21/00B08B3/12
CPCC01B33/12B02C21/00B08B3/12
Inventor 钱军谭倩郭兴楠
Owner JIANGSU UNIV
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