Method for preparing filler-level silicon micropowder by using waste quartz crucibles as raw materials

A waste quartz crucible, quartz crucible technology, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problem that it is difficult to meet the needs of high-quality silicon natural resources, and achieve the effects of improving grinding efficiency, reducing costs, and simplifying process steps

Inactive Publication Date: 2014-03-05
南京工业大学东海先进硅基材料研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although my country is a country with a large number of siliceous mineral resources in the world, there are not many high-grade siliceous rocks, and it is increasingly difficult to meet the industry's demand for high-quality siliceous natural resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0044] (1) Ultrasonic water washing: place large pieces of quartz crucible in the cleaning tank, add water for ultrasonic cleaning, ultrasonic time 1 h, power: 500 kHz;

[0045](2), crushing and screening: use a roller crusher to crush the cleaned quartz crucible fragments to particle size ≤ 3 mm;

[0046] (3) Grinding and pickling: put the particle size ≤ 3 mm in the ball mill, add sulfuric acid and hydrochloric acid mixed acid, adjust the slurry concentration to 45%, and the ball milling time is 4.5 h; centrifuge after ball milling, and the upper acid solution Recycling and reuse, the bottom slurry is centrifugally cleaned with high-purity water until the upper layer solution is neutral; after vibrating sieving, the under-sieve slurry of 325 mesh (45 μm) is obtained, and the coarse powder is returned to the mill for grinding;

[0047] (4) Wet magnetic separation: use high-purity water to adjust the flotation slurry into a slurry with a slurry concentration of 30%, and the sl...

Embodiment example 2

[0054] (1) Ultrasonic water washing: put the large pieces of quartz crucible in the cleaning tank, add water for ultrasonic cleaning, ultrasonic time 1.5 h, power: 450 kHz;

[0055] (2), crushing and screening: use a roller crusher to crush the cleaned quartz crucible fragments to particle size ≤ 3 mm;

[0056] (3) Grinding and pickling: put the granular material with a particle size of ≤3 mm in a ball mill, add nitric acid, sulfuric acid and hydrochloric acid mixed acid, adjust the slurry concentration to 55%, and mill for 4 hours; after ball milling, centrifuge the upper layer The acid solution is recovered and reused, and the bottom slurry is centrifugally washed with high-purity water until the upper layer solution is neutral; after vibrating sieving, the under-sieve slurry of 325 mesh (45 μm) is obtained;

[0057] (4) Wet magnetic separation: use high-purity water to adjust the flotation slurry into a slurry with a slurry concentration of 25%, and the slurry flows into th...

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PUM

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Abstract

The invention relates to a method for preparing filler-level silicon micropowder by using waste quartz crucibles as raw materials. Aiming at the problems that the quartz crucible waste products have great stock at present and high-quality silicon natural resources are scarce increasingly, the invention provides a method for preparing silicon micropowder which is suitable for serving as fillers and has high purity, wide particle size distribution and low electric conductivity by using waste quartz crucibles as raw materials through the technical treatment of ultrasonic washing, crushing, levigating and acid washing, flotation, magnetic separation, flashing and drying, electric separation and the like. By adopting the method, the problem about resource exhaustion of high-purity quartz mine and the problem about comprehensive utilization of waste quartz crucibles of photovoltaic enterprises and crucible preparation enterprises are relieved to a certain degree.

Description

technical field [0001] The invention relates to a technology for deep processing, deep-level utilization and resource utilization of industrial solid discharges, in particular to a method for preparing filler-grade silicon micropowder using waste quartz crucibles as raw materials. Background technique [0002] Silica powder is a high-quality neutral inorganic filler with excellent physical properties such as high insulation, high thermal conductivity, high thermal stability, acid and alkali resistance, wear resistance, low thermal expansion coefficient, and low dielectric constant. , Widely used in plastics, rubber, coatings, electronics and other industries. With the development of these industries, the demand for silica filler is increasing. Although my country is a country rich in siliceous mineral resources in the world, there are not many high-grade siliceous rocks, and it is increasingly difficult to meet the industry's demand for high-quality siliceous natural resour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
Inventor 唐明亮沈春英郑海胡增涵
Owner 南京工业大学东海先进硅基材料研究院
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