Green environmentally-friendly method for smelting high-purity silicon

A smelting method and high-purity technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as loss of crystalline silicon and environmental pollution, and achieve the effects of low production cost, improved purity, and improved smelting effect.

Active Publication Date: 2019-08-23
BAOXING YIDA PHOTOVOLTAIC BLADE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of making semiconductor devices, it is necessary to use diamond wires to cut silicon wafers, and a lot of waste silicon mud will inevitably be produced during cutting. The silicon mud contains a large amount of silicon, which not only loses valuable crystalline silicon, but also affects huge pollution of the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Mix 100kg of silica mud, SiO 2 3.3 kg was placed in a blender and stirred thoroughly for 30 minutes to make it completely mixed evenly to obtain a premix.

[0044](2) Encrypt and shape the premixed material with a processing machine to make a block with a particle size within the range of 10-20 mm, and put it into a drying room for 12 hours to dry completely so that the moisture content by weight is ≤0.4%.

[0045] (3) Heating the dried block material through an intermediate frequency furnace to completely melt the block material to obtain silicon liquid.

[0046] (4) Add NaCl 2kg, Na 2 CO 3 5kg, limestone 4Kg, bentonite 4Kg, NaNO 3 2kg and MnO 2 1kg, after adding, heat the silicon solution to 1600°C for 2h.

[0047] (5) Remove the silicon slag, and repeat step (4) once.

[0048] (6) Remove the silicon slag, add Li to the silicon liquid 2 CO 3 5Kg, Na 2 O 2Kg, CaO 5Kg, CaCl 2 2 parts, BaO 1Kg, SiO 2 10Kg, heat the silicon solution to 1800°C for 2h. ...

Embodiment 2

[0053] (1) Mix 100kg of silica mud, SiO 2 2kg was placed in a mixer, fully stirred for 30 minutes to make it completely mixed evenly to obtain a premix.

[0054] (2) Encrypt and shape the premixed material with a processing machine to make a block with a particle size within the range of 10-20 mm, and put it into a drying room for 12 hours to dry completely so that the moisture content by weight is ≤0.4%.

[0055] (3) Heating the dried block material through an intermediate frequency furnace to completely melt the block material to obtain silicon liquid.

[0056] (4) Add 1kg of NaCl, Na 2 CO 3 8kg, limestone 3Kg, bentonite 4Kg, NaNO 3 5kg and MnO 2 1.25kg, after adding, heat the silicon solution to 1500°C for 3h.

[0057] (5) scrape off the silicon slag, and repeat step (4) twice.

[0058] (6) Remove the silicon slag, add Li to the silicon liquid 2 CO 3 3Kg, Na 2 O 2Kg, CaO 8Kg, CaCl 2 4 parts, BaO 2Kg, SiO 2 8Kg, heat the silicon liquid to 1900°C for 1h.

[...

Embodiment 3

[0063] (1) Mix 100kg of silica mud, SiO 2 2.5 kg was placed in a blender and stirred thoroughly for 30 minutes to make it completely mixed evenly to obtain a premix.

[0064] (2) Encrypt and shape the premixed material with a processing machine to make a block with a particle size within the range of 10-20 mm, and put it into a drying room for 12 hours to dry completely so that the moisture content by weight is ≤0.4%.

[0065] (3) Heating the dried block material through an intermediate frequency furnace to completely melt the block material to obtain silicon liquid.

[0066] (4) Add NaCl 3kg, NaCl to the silicon liquid 2 CO 3 3kg, limestone 8Kg, bentonite 3Kg, NaNO 3 2kg and MnO 2 1kg, after adding, heat the silicon solution to 1700°C for 1h.

[0067] (5) Remove the silicon slag, and repeat step (4) once.

[0068] (6) Remove the silicon slag, add Li to the silicon liquid 2 CO 3 8Kg, Na 2 O 4Kg, CaO 3Kg, CaCl 2 2 parts, BaO 1Kg, SiO 2 15Kg, heat the silicon so...

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Abstract

The invention discloses a green environmentally-friendly method for smelting high-purity silicon. According to the method provided by the invention, most impurities in silicon mud can be effectively removed by using specific slag forming agents in combination with specific mixed gas blowing, and the high-purity silicon with purity of 99.999% or more can be obtained; and the method has low costs, is green, environmentally friendly and worthy for promotion and use, and facilitates development of a solar photovoltaic industry.

Description

technical field [0001] The invention relates to the field of high-purity silicon smelting, in particular to a method for smelting high-purity silicon by using waste silicon mud. Background technique [0002] High-purity silicon refers to a silicon material with a relatively high silicon content. High-purity single crystal silicon can be used to make semiconductors, integrated circuits, photovoltaic cells, etc., and a small amount of Group IIIA elements are doped into single crystal silicon to form p-type silicon Semiconductor; doped with trace amounts of Group VA elements to form n-type semiconductors. P-type semiconductors and n-type semiconductors are combined to form a p-n junction, which can be made into a solar cell, which converts radiation energy into electrical energy. It is a promising material in the development of energy. In addition, widely used diodes, triodes, thyristors, field effect transistors and various integrated circuits (including chips and CPUs in pe...

Claims

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Application Information

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IPC IPC(8): C01B33/037
CPCC01B33/037
Inventor 吕军超李汝利郭琴
Owner BAOXING YIDA PHOTOVOLTAIC BLADE MATERIAL
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