Method for preparing electronic-grade high-purity quartz sand

A technology of high-purity quartz sand and electronic grade, which is applied in the direction of using liquid cleaning methods, cleaning methods and utensils, chemical instruments and methods, etc., can solve the problems of dependence and blind obedience of processing technology, and reduce labor intensity and production Cost, reduction of grinding energy consumption, and the effect of reducing energy consumption

Pending Publication Date: 2022-04-22
(CNBM) BENGBU DESIGN & RES INST FOR GLASS IND CO LTD
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Problems solved by technology

[0004] The invention proposes a method for preparing electronic-grade high-purity quartz sand, which can greatly solve the dependence of existing high-purity quartz materials on raw materials and the blind obedience of processing technology

Method used

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Embodiment 1

[0027] The pegmatite-type vein quartz is selected from a place in India, and the main minerals are quartz, mica, tourmaline, garnet, epidote, etc. A method for preparing electronic-grade high-purity quartz sand of the present invention comprises the following steps:

[0028] (1) Pegmatite-type vein quartz is washed with 50Mpa ultra-high pressure water to wash the attachments and mud on the surface of the quartz ore and the gap between the pits;

[0029] (2) After washing, the ore is crushed by a jaw crusher to less than 30 mm, and the quartz blocks containing impurities and inclusions and non-quartz minerals are removed to obtain selected quartz blocks;

[0030] (3) The selected quartz blocks are transported to the high-voltage electric pulse crushing equipment for high-voltage pulse pretreatment, and the pulse discharge crushes 200 times per 200kg of quartz ore. The rising time of the high-voltage pulse is 300ns, the pulse intensity is 100kV, and the pulse frequency is 20Hz; ...

Embodiment 2

[0040] It is selected from granular metamorphic hydrothermal vein quartz in Central Asia. The surrounding rocks of the mine are granite gneiss and shale, and the interlayer of quartz ore bodies contains minerals such as feldspar and mica. The invention provides a method for preparing electronic grade high-purity quartz sand The process is as follows:

[0041] (1) For granular metamorphic hydrothermal vein quartz, use 150Mpa ultra-high pressure water to wash the attachments and mud on the surface of the quartz ore and the gap between the pits;

[0042] (2) The ore after washing is crushed to less than 30mm by a jaw crusher, and the quartz and non-quartz minerals containing more impurities are removed to obtain selected quartz blocks;

[0043] (3) The selected quartz blocks are transported to the high-voltage electric pulse crushing equipment for high-voltage electric pulse pretreatment. The rising time of the high-voltage electric pulse is 200ns, the pulse intensity is 200kV, a...

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Abstract

The invention discloses a method for preparing electronic-grade high-purity quartz sand, which comprises the following steps: washing quartz raw ore with ultrahigh-pressure water, crushing into 30 mm quartz blocks, finely selecting the quartz blocks, pretreating by adopting high-voltage electric pulse, crushing and screening to prepare-40-mesh quartz sand, carrying out magnetic separation on the quartz sand to remove magnetic minerals, and drying to obtain the electronic-grade high-purity quartz sand. Non-quartz silicate minerals are removed through flotation, residual impurity minerals on the surfaces of quartz sand and quartz particles are removed from flotation fine sand through dynamic acid pickling, the flotation fine sand is dried, calcined, rapidly cooled and acid-pickled, acid-pickled fine sand is graded to obtain quartz sand with a certain specification, and the quartz sand is subjected to vacuum degassing, cooling and packaging. It is ensured that the product meets the quality requirement of high-purity quartz sand for electronic products SJT 3328.1-2016, and the requirement of the domestic electronic industry for high-purity quartz sand is met.

Description

technical field [0001] The invention relates to a quartz sand processing and preparation technology, in particular to a method for preparing electronic-grade high-purity quartz sand. Background technique [0002] High-purity quartz is the only raw material for the preparation of high-end quartz products. It is closely related to eight of the nine major fields of the new generation of information technology and new material industries in strategic emerging industries. It is an important supporting material in strategic emerging industries. . However, due to the particularity of production raw materials and technical confidentiality, the production and export of high-purity quartz and its raw materials are highly concentrated in a few countries and enterprises in the world, among which high-end processing and purification technologies and products are mainly mastered by developed countries such as the United States. my country has a long history of research on high-purity qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B3/02B08B3/12B08B13/00C01B33/12
CPCB08B3/02B08B13/00B08B3/12C01B33/12C01P2006/80
Inventor 陶立纲尚德兴吴建新李佩悦张乾伟李佳周新军
Owner (CNBM) BENGBU DESIGN & RES INST FOR GLASS IND CO LTD
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