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Method for preparing high-purity superfine quartz powder through waste quartz crucible

A technology of ultra-fine quartz powder and quartz pot, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems that the purity of high-purity ultra-fine quartz powder is not easy to guarantee, the impurity content is very different, and the price of raw materials is high, and it is beneficial to land and resources. The effect of protection, realization of recycling, and reduction of manufacturing costs

Active Publication Date: 2014-07-02
江苏凯达石英股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the grades of raw quartz ore vary greatly across the country, and the content of impurities varies greatly. The purity of high-purity ultra-fine quartz powder produced by traditional techniques is not easy to guarantee.
Moreover, with the depletion of high-grade quartz ore resources, the price of raw materials will become higher and higher, and the production cost will also become higher and higher.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) crushing: using waste quartz crucible as raw material, after crushing, the particle size is 1mm;

[0019] (2) Pickling: Use the pickling device with an ultrasonic generator to pickle and remove impurities on the block. The ultrasonic frequency is 35Hz and the ultrasonic power is 600W. The binary mixed acid of oxalic acid and hydrochloric acid or hydrofluoric acid, oxalic acid and The ternary mixed acid of nitric acid; the proportion of oxalic acid and hydrochloric acid in the binary mixed acid is 1:3, and the proportion of hydrofluoric acid, oxalic acid and nitric acid in the ternary mixed acid is 1:5:1; the weight of the block and the mixed acid The ratio is 1:5; the specific process is: at room temperature, use the mixed acid solution to soak the block for 10 hours, stir 3 times in the middle, and then treat it in the ultrasonic field for 100 minutes to flow away the surface solution;

[0020] (3) Washing: Use pure water to ultrasonically clean the pickled block m...

Embodiment 2

[0025] (1) crushing: adopt waste and old quartz crucible as raw material, obtain the block material that particle diameter is 5mm after crushing;

[0026] (2) Pickling: use the pickling device with an ultrasonic generator to pickle and remove impurities on the block, the ultrasonic frequency is 40Hz, the ultrasonic power is 650W, and the binary mixed acid of oxalic acid and hydrochloric acid or hydrofluoric acid, oxalic acid and The ternary mixed acid of nitric acid; the proportion of oxalic acid and hydrochloric acid in the binary mixed acid is 1:2, and the proportion of hydrofluoric acid, oxalic acid and nitric acid in the ternary mixed acid is 1:4:1; the weight of the block and the mixed acid The ratio is 1:4; the specific process is: at room temperature, use the mixed acid solution to soak the block for 20 hours, stir 3 times in the middle, and then treat it in the ultrasonic field for 80 minutes to flow away the surface solution;

[0027] (3) Water washing: Ultrasonic cle...

Embodiment 3

[0032] (1) crushing: adopt waste and old quartz crucible as raw material, obtain the block material that particle diameter is 10mm after crushing;

[0033] (2) Pickling: Use the pickling device with an ultrasonic generator to pickle and remove impurities on the block material. The ultrasonic frequency is 45Hz and the ultrasonic power is 700W. The binary mixed acid of oxalic acid and hydrochloric acid or hydrofluoric acid, oxalic acid and The ternary mixed acid of nitric acid; the proportion of oxalic acid and hydrochloric acid in the binary mixed acid is 1:1, and the proportion of hydrofluoric acid, oxalic acid and nitric acid in the ternary mixed acid is 1:3:1; the weight of the block and the mixed acid The ratio is 1:3; the specific process is: at room temperature, use the mixed acid solution to soak the block for 50 hours, stir 4 times in the middle, and then treat it in the ultrasonic field for 60 minutes to flow away the surface solution;

[0034] (3) Washing: Use pure wa...

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Abstract

The invention discloses a method for preparing high-purity superfine quartz powder through a waste quartz crucible. The method comprises steps of crushing, acid pickling, water washing, drying, grinding, grading, collecting and the like. Due to the use of the waste quartz crucible, the purity of SiO2 in the raw material is very high, through further purification and impurity removal and ultrafine grinding of the waste quartz crucible, high-purity superfine quartz powder with not less than 99.95% of SiO2, size distribution of 1-100mu m and amorphous rate of 98%-100% is obtained, which is applicable to high and new technology industries like optical fiber industry, electronic industry, microelectronics industry and the like, so that the method can remarkably relieve excessive dependency on quartz raw ore, recycles quartz sand, is beneficial to protecting land resources, greatly lowers the manufacture cost of the quartz crucible, and also solves the problems of pollution and emission of solid waste of the enterprises producing and using the quartz crucible.

Description

technical field [0001] The invention relates to a preparation method of high-purity ultrafine quartz material, in particular to a method for preparing high-purity ultrafine quartz powder by using waste quartz crucibles as raw materials. Background technique [0002] High-purity ultra-fine quartz powder has excellent chemical and physical properties, with a melting point of 1715°C, an α-β structure transition temperature of 573°C, no cleavage, excellent chemical stability, high insulation and voltage resistance, and a breakdown voltage of 32- 34KV / mm, low thermal expansion, used as a high-quality filler for integrated circuits, microelectronics products, plastic packaging materials, etc. [0003] With the rapid development of high-tech industries such as optical fiber industry, electronics industry, and microelectronics industry, the requirements for high-purity ultra-fine quartz powder are getting higher and higher, and the demand is also increasing. At present, most of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 张凤凯徐腾刘祥友张勋
Owner 江苏凯达石英股份有限公司
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