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A method for recycling fused silica crucible after polysilicon ingot casting

A quartz crucible and fused silica technology, which is applied in the growth of polycrystalline materials, chemical instruments and methods, silicon compounds, etc., can solve the problems of poor economic feasibility, low added value and high production cost, and achieve high economic feasibility and added value. high effect

Active Publication Date: 2020-03-31
江苏美科太阳能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two methods require high-temperature calcination of the quartz crucible, the production cost is extremely high, and the added value of the product is low, and the economic feasibility is poor.

Method used

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  • A method for recycling fused silica crucible after polysilicon ingot casting

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Experimental program
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Effect test

Embodiment 1

[0028] A fused silica crucible after polysilicon ingot casting, the main components of which are 99.5% of silicon dioxide, 0.3% of silicon carbide and 0.2% of aluminum oxide.

[0029] refer to figure 1 A method for recycling a fused silica crucible after polysilicon ingot casting according to the present embodiment comprises the following steps:

[0030] 1. Use an industrial-grade impact drill to break a large piece of fused silica crucible into 15-30cm crucible fragments;

[0031] 2. Soak the crucible fragments in weak acid for 6 hours, and then perform ultrasonic removal;

[0032] 3. Put the crucible fragments into the jaw crusher for secondary fine crushing, and crush them into crucible fragments with a particle size of 1-2 cm;

[0033] 4. Using ultra-fine powder technology, grind the crucible fragments into quartz powder with a particle size distribution of about 800 mesh in a ball mill, and inject the obtained powder slurry into the raw material slurry pool for standby;...

Embodiment 2

[0037] refer to figure 1 A method for recycling a fused silica crucible after polysilicon ingot casting according to the present embodiment comprises the following steps:

[0038] 1. Use an industrial-grade impact drill to break a large piece of fused silica crucible into 15-30cm crucible fragments;

[0039] 2. Soak the crucible fragments in water for 12 hours, and then perform ultrasonic removal;

[0040] 3. Put the de-impured crucible fragments into the jaw crusher for secondary fine crushing, and crush them into crucible fragments with a particle size of 1-2 cm;

[0041] 4. Using ultra-fine powder technology, grind the crucible fragments in a ball mill into quartz powder with a particle size distribution of about 1000 mesh, and inject the obtained powder slurry into the raw material slurry pool for standby;

[0042] 5. Add silicon carbide powder and binder to the quartz powder slurry, with a weight ratio of 3:2:0.05, press to form, and dry in an oven until the water conte...

Embodiment 3

[0045] refer to figure 1 A method for recycling a fused silica crucible after polysilicon ingot casting according to the present embodiment comprises the following steps:

[0046] 1. Use an industrial-grade impact drill to break a large piece of fused silica crucible into 15-30cm crucible fragments;

[0047] 2. Soak the crucible fragments in water for 12 hours, and then perform ultrasonic removal;

[0048] 3. Put the de-impured crucible fragments into the jaw crusher for secondary fine crushing, and crush them into crucible fragments with a particle size of 1-2 cm;

[0049] 4. Using ultra-fine powder technology, grind the crucible fragments in a ball mill into quartz powder with a particle size distribution of about 1000 mesh, and inject the obtained powder slurry into the raw material slurry pool for standby;

[0050] 5. Add silicon carbide powder and binder to the quartz powder slurry, with a weight ratio of 3:2:0.05, press to form, and dry in an oven until the water conte...

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Abstract

The invention belongs to the technical field of resource recycling, and relates to a method for preparing high-purity silicon from a fused silica crucible after polysilicon ingot casting. The method specifically comprises the following steps: (1) preliminarily crushing the fused silica crucible; (2) purifying crucible scraps; (3) secondarily crushing the purified crucible scraps; (4) ball-milling the crucible scraps to obtain quartz powder with the particle size distribution of 800 to 1,000 meshes; (5) adding silicon carbonate powder and an adhesive into quartz powder slurry, and performing compression molding and drying for later use; (6) performing high-temperature smelting and directional solidification on a compressed mixture in a submerged arc furnace or an electric arc furnace to prepare industrial silicon, high-purity silicon or solar-grade crystalline silicon. According to the method, the waste fused silica crucible is effectively utilized, not only is cost of an enterprise in treatment of the waste fused silica crucible reduced, but also silicon products of various grades are prepared from the waste silica crucible to implement resource recycling and achieve consistency with the characteristic of circular economy, and the method has higher economic value and social significance.

Description

technical field [0001] The invention belongs to the technical field of resource regeneration, and relates to a method for recovering and reusing a fused silica crucible after polycrystalline silicon ingot casting. Background technique [0002] With the development of society, the photovoltaic industry represented by polycrystalline silicon solar cells has developed rapidly. Polysilicon ingot casting is one of the important links in the preparation of polysilicon solar cells, and the quartz crucible used in this process is a disposable product, and the consumption is particularly large. After the ingot casting is complete, the fused silica crucible is converted to cristobalite material and becomes industrial waste. In the past, the processing method was generally to be used as building filler after simple crushing, but now it has developed to the point that people are willing to take it away only after paying the freight. In the future, with the continuous improvement of en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/025C30B29/06C30B28/06
CPCC01B33/025C01P2006/80C30B28/06C30B29/06
Inventor 钱军谭倩郭兴楠
Owner 江苏美科太阳能科技股份有限公司
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