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Purification process of fused quartz for polycrystalline silicon crucible

A technology of fused silica and fused silica powder, which is applied in the field of purification technology of fused silica, can solve the problems of waste and can not fully meet the high quality, and achieve the effect of realizing recycling, solving pollution and recycling problems, and alleviating excessive dependence.

Inactive Publication Date: 2021-01-12
徐州赛诺石英有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fused silica powder obtained in this way still contains a lot of impurities, which cannot fully satisfy the production of high-quality crucibles.
[0003] At present, in the production of polysilicon ingots, crucibles are often disposable and scrapped when used up, thus causing huge waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. a purification process for the fused silica of polysilicon crucible, is characterized in that, comprises the following steps:

[0036] (1) Crushing: use the discarded polysilicon production crucible as raw material, and crush it into quartz grains with a particle size of 6 cm with a stone crusher;

[0037] (2) Quenching: Put the quartz grains into a resistance furnace at 1000°C, roast for 5 hours, and then immediately pour liquid carbon dioxide on them for cold quenching, and the large grains of quartz will burst into smaller quartz grains;

[0038] (3) Rolling: the quartz grains obtained in step 2 are rolled into quartz sand with a rolling machine, and the average particle size is less than 1cm;

[0039] (4) Magnetic separation and impurity removal: the quartz sand obtained in the previous step is magnetically separated under a field strength of 2000 Gauss using a magnetic separator to remove magnetic impurities;

[0040] (5) Flotation: Put the quartz sand obtained...

Embodiment 2

[0048] A purification process for fused silica in a polysilicon crucible, comprising the following steps:

[0049](1) Crushing: use the discarded polysilicon production crucible as raw material, and crush it into quartz grains with a particle size of 8 cm with a stone crusher;

[0050] (2) Quenching: Put the quartz grains into a resistance furnace at 1100°C and roast for 6.5 hours. After taking them out, immediately sprinkle them with liquid carbon dioxide for cold quenching. Large grains of quartz grains burst into smaller grains of quartz;

[0051] (3) Rolling: the quartz grains obtained in step 2 are rolled into quartz sand with a rolling machine, and the average particle size is less than 1cm;

[0052] (4) Magnetic separation and impurity removal: the quartz sand obtained in the previous step is magnetically separated under 3000 Gauss field strength using a magnetic separator to remove magnetic impurities;

[0053] (5) Flotation: Put the quartz sand obtained in step 4 in ...

Embodiment 3

[0063] A purification process for fused silica in a polysilicon crucible, comprising the following steps:

[0064] (1) Crushing: use the discarded polysilicon production crucible as raw material, and crush it into quartz grains with a particle size of 10 cm with a stone crusher;

[0065] (2) Quenching: Put the quartz grains into a resistance furnace at 1200°C, roast for 8 hours, and then immediately pour liquid carbon dioxide on them for cold quenching, and the large grains of quartz will burst into smaller quartz grains;

[0066] (3) Rolling: the quartz grains obtained in step 2 are rolled into quartz sand with a rolling machine, and the average particle size is less than 1cm;

[0067] (4) Magnetic separation and impurity removal: the quartz sand obtained in the previous step is magnetically separated under a field strength of 4000 Gauss using a magnetic separator to remove magnetic impurities;

[0068] (5) Flotation: Put the quartz sand obtained in step 4 in the flotation m...

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Abstract

The invention belongs to the field of fused quartz production, and particularly discloses a purification process of fused quartz for a polycrystalline silicon crucible, which comprises the steps of (1) crushing, (2) cold quenching, (3) rolling, (4) magnetic separation and impurity removal, (5) flotation, (6) ultrasonic impurity removal, (7) high-temperature vacuum treatment, (8) smelting, (9) grinding and (10) split charging. The disclosed purification method is simple in process and substantial in purification effect, and the obtained high-purity fused quartz can be used for a crucible for producing polycrystalline silicon.

Description

technical field [0001] The invention belongs to the field of fused quartz production, and specifically discloses a purification process of fused quartz used in a polysilicon crucible. Background technique [0002] The crucible is a necessary device for the production of polycrystalline silicon ingots in the photovoltaic industry. The silicon liquid is heat-treated at high temperature in the crucible to obtain silicon ingots. The crucibles for polysilicon ingot casting in my country are all made of fused silica ceramics, which are prepared by slip-casting or gel-casting. Since silicon ingots require extremely high purity, the purity requirements for fused silica are also very high. High-purity fused silica can be easily obtained in the laboratory, but at present, general fused silica production enterprises produce fused silica powder. From raw materials to finished products, the main process is roughly as follows: Quartz ore is processed into smaller Stone materials, stone ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C03B20/00B03D1/01
CPCB03D1/01C01B33/12C01P2006/80C03B20/00
Inventor 季明光
Owner 徐州赛诺石英有限公司
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