A method for preparing high-purity quartz sand powder used for electronic products by utilizing quartzite containing feldspar

A technology of electronic products and quartz sand powder, which is applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of difficult removal and no separation process, and achieve an obvious effect of removing impurities

Active Publication Date: 2019-03-29
HUANGGANG NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This rock has large geological reserves and is easy to mine, but it is difficult to completely separate quartz and feldspar and remove black impurities in quartz particles during use. There is no mature separation process for the time being, and the use of feldspar-containing quartzite Relevant literature and reports on the preparation of high-purity quartz sand powder for electronic products

Method used

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  • A method for preparing high-purity quartz sand powder used for electronic products by utilizing quartzite containing feldspar

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Embodiment 1

[0033] The feldspar-type quartzite ore that Outer Mongolia produces is raw material to illustrate the process of the present invention:

[0034] ① Ore pretreatment: first wash the soil impurities on the ore with clean water, and then manually select to remove impurities such as feldspar minerals and mountain stones, and then crush them to particles with a particle size of 10-25mm, using a mass fraction of 2%. The hydrofluoric acid solution is heated and dynamically dipped to remove the colored substances on the outside of the ore, and then washed with clean tap water until neutral and dried for later use; the washing water is neutralized with calcium ion-containing alkaline water to generate fluorine Calcium chloride, the clear water after precipitation of calcium fluoride is reprocessed and recycled.

[0035] ② The ore dried in step ① is subjected to color sorting for 3 times with a color sorter to remove the dark mineral particle material for later use; the dark color particle...

Embodiment 2

[0047] The process of the present invention is described as raw material with the production of feldspar-type quartzite ore in a certain place in Hebei:

[0048] ① Pretreatment of ore: first wash the soil impurities on the ore with clean water, and then remove impurities such as feldspar minerals and mountain stones through artificial primary selection, then crush them to particles with a particle size of 10-25mm, and use 5% hydrofluoric acid solution Heat and soak to remove the colored substances on the outside of the ore, and then wash with clean tap water until neutral and dry for later use; the washing water is neutralized with alkaline water containing calcium ions to form calcium fluorosilicate precipitation, and the precipitated Clean water is recycled.

[0049] ② The ore dried in step ① is subjected to color sorting for at least 3 times with a color sorter to remove the dark mineral particle material for later use; the dark color particle material separated by color so...

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Abstract

A method for preparing high-purity quartz sand powder used for electronic products by utilizing quartzite containing feldspar is provided. The method includes crushing raw material ore into particleshaving a particle size of 10-25 mm after manual selection; washing to remove outer impurities through a fluorine-containing acid solution; separating quartz and feldspar particles by color separation;preparing sand from the quartz particles; separating feldspar particles from prepared sand through flotation; removing feldspar not separated by flotation through acid washing with hydrofluoric acid;and then subjecting the purified quartz sand to calcination, water quenching, high-temperature pickling purification, high-temperature oxidation roasting, and high-temperature chlorination to minimize impurities, thereby ensuring that a product after purification meets or exceeds the technical quality requirements of the industrial standard 'High-Purity Quartz Sand for Electronic Products' to meet the needs of domestic users.

Description

technical field [0001] The invention relates to a method for preparing high-purity quartz sand powder for electronic products by utilizing feldspar-containing ore-type quartz rock, and belongs to the technical field of non-metallic ore deep processing. Background technique [0002] According to the industry standard SJ3228.1-2016 of the People's Republic of China "High-purity Quartz Sand for Electronic Products": High-purity quartz sand for electronic products is used to manufacture tubes, rods, blocks, plates, sheets, and crucibles for semiconductor quartz devices. . Its technical requirements stipulate that the appearance of high-purity quartz sand for electronic products should be white particles with a certain degree of transparency, and there should be no foreign-colored and visible impurities. The cumulative mass fraction of the particle size in the range of 70um-350um should be greater than or equal to 90%; the cumulative mass fraction of the particle size less than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/80
Inventor 田辉明田正芳陈中文杨水彬黄林勇雷绍民
Owner HUANGGANG NORMAL UNIV
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