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Method for preparing industrial silicon by cutting crystal silicon waste through diamond wires

A diamond wire cutting and cutting waste technology, applied in the field of metallurgy, can solve the problems of unreasonable purification and recycling of waste water, hydrogen unfavorable safety production, long smelting cycle, etc., achieve good drop strength and compressive strength, shorten Melting cycle, the effect of facilitating safe production

Inactive Publication Date: 2019-03-01
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not properly purify and recycle the washed wastewater, and it is easy to generate hydrogen gas during the pellet dehydration process, which is not conducive to safe production. The cycle is relatively long, time-consuming and labor-intensive, and the economic benefit is low

Method used

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  • Method for preparing industrial silicon by cutting crystal silicon waste through diamond wires

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Effect test

Embodiment 1

[0033] A method for preparing industrial silicon by diamond wire cutting crystalline silicon waste, comprising the steps of:

[0034] (1) Pickling the crystalline silicon cutting waste to remove impurities and iron, using sulfuric acid to remove iron, time 1h, temperature 80°C, acid concentration 1.5mol / L, liquid-solid ratio 2:1, and then filtered and washed, the iron content was detected to be 0.36%.

[0035] (2) The above crystalline silicon cutting waste is crushed, and after crushing, the particle size of more than 90% of the particles is less than 100 μm. 1 kg of modified water glass consumption, 5 kg of crystalline silicon cutting waste, and 4 kg of water are mixed according to this ratio, and pressed into a ball with a diameter of 25 mm by a high-pressure roller press.

[0036] (3) Low-temperature dehydration at 70°C for 12 hours until the weight of the wet bulb no longer changes.

[0037] (4) Remove organic matter at 300°C for 1 hour. The removed organic matter enter...

Embodiment 2

[0042] A method for preparing industrial silicon by diamond wire cutting crystalline silicon waste, comprising the steps of:

[0043] (1) Pickling the crystalline silicon cutting waste to remove iron impurities, using sulfuric acid to remove iron, time 1.5h, temperature 70°C, acid concentration 1mol / L, liquid-solid ratio 3:1, and then filtered and washed, the iron content was detected to be 0.31%.

[0044] (2) The above crystalline silicon cutting waste is crushed, and after crushing, the particle size of more than 90% of the particles is less than 100 μm. Modified water glass consumption 0.8 kilograms, 5.2 kilograms of crystalline silicon cutting wastes, 4 kilograms of water, carry out mixing according to this proportioning, press into the ball of diameter 20mm with high pressure pair roller press.

[0045] (3) Low-temperature dehydration at 70°C for 12 hours until the weight of the wet bulb no longer changes.

[0046](4) Remove organic matter at 250°C for 1.5 hours. The re...

Embodiment 3

[0051] A method for preparing industrial silicon by diamond wire cutting crystalline silicon waste, comprising the steps of:

[0052] (1) Pickling the crystalline silicon cutting waste to remove iron impurities, using sulfuric acid to remove iron, time 1.5h, temperature 60°C, acid concentration 1mol / L, liquid-solid ratio 5:1, and then filtered and washed, the iron content was detected to be 0.16%.

[0053] (2) The above crystalline silicon cutting waste is crushed, and after crushing, the particle size of more than 90% of the particles is less than 100 μm. Modified water glass consumption is 0.6 kilograms, 5.6 kilograms of crystalline silicon cutting waste materials, 3.8 kilograms of water, carry out mixing according to this proportioning, press into the grain of diameter 2mm with high-pressure pair roller press.

[0054] (3) Perform low-temperature dehydration at 80°C for 10 hours until the weight of the wet bulb no longer changes.

[0055] (4) Remove organic matter at 350°...

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Abstract

The invention provides a method for preparing industrial silicon by cutting crystal silicon waste through diamond wires. The method includes the steps that in percentage by mass: 5-10 wt% of modifiedsodium silicate, 50-65 wt% of the pretreated crystal silicon cutting waste and 30-40 wt% of water are mixed, and a wet ball with the diameter being 1-50 mm is then pressed; low temperature dehydrationis conducted under the condition of 60-90 DEG C until the weight of the wet ball does not change, and a dry ball is obtained; organic matters are removed from the dry ball, the removed organic matters are decomposed, and decomposition products are absorbed by a spray tower and then injected into the atmosphere; the dry ball after removing the organic matters is sintered in an airtight container;the sintered dry ball is smelted in an induction furnace which is lined with a graphite crucible and provided with a graphite bar in the middle; and an alloy is obtained by slagging-off and pouring ofthe smelted products, and the compositions of the alloy are detected. According to the method for preparing the industrial silicon by cutting the crystal silicon waste through the diamond wires, theproduction cycle is short, the dropping strength of the wet and dry balls and the compressive strength are good, and security and environmental protection are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing industrial silicon by using diamond wire cutting crystalline silicon waste. Background technique [0002] At present, diamond wire cutting has become the main method of silicon ingot cutting, and the silicon content of the waste generated by cutting is generally above 85%, which has a high recycling value. In industry, silica and coke are mixed in a certain proportion and heated to 1600-1800°C in an electric furnace to obtain crude silicon with a purity of 95%-99%. In order to further improve the purity of crude silicon, acid leaching is used to clean Crude silicon purification, the process is: after crushing the crude silicon, followed by hydrochloric acid, aqua regia, HF+H 2 SO 4 The crushed crude silicon is acid-treated with mixed acid, and finally washed with distilled water to neutrality, and industrial silicon with a purity of 99.9% can be obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
CPCC01B33/037
Inventor 韩庆邢延慧李斌川刘奎仁陈建设
Owner NORTHEASTERN UNIV LIAONING
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