Process for preparing ultrahigh pure quartz sand through silica raw material

A technology of quartz sand and silica, which is applied in the technical field of preparing ultra-high-purity quartz sand from silica raw materials, can solve the problems that the impurities wrapped in quartz sand cannot be effectively removed, and it is difficult to remove them, so as to achieve the effect of improving efficiency and obvious effect

Active 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

This purification process is relatively simple, and cannot effectively remove the wrapped impurities in the quartz sand, surface impurities, and introduce new impurities during the production process.
In the prior art, there are reports of alkali washing, such as the publication number CN102674376A, the title of the inventi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Proceed as follows:

[0054] (1) First, artificially sort the vein quartz raw materials to remove impurities and foreign matter that are clearly observed by the naked eye;

[0055] (2) Place the artificially sorted vein quartz stone in a muffle furnace for calcination, heat it to 950°C and keep it warm for 3 hours. After the heat preservation is over, take out the quartz stone directly and put it into flowing cold water for quenching;

[0056] (3) Dry the quenched vein quartz and crush it to 80-100 mesh with a double roller machine;

[0057] (4) Using an electromagnetic induction roller magnetic separator with a magnetic field strength of 2.0 Tesla, physically remove impurities from the crushed quartz sand, and after removing the magnetic substances in the quartz sand, use a high-voltage electric separator with a voltage of 25 Thousand volts, high-voltage electric separation and removal of impurities on quartz sand to remove charged impurities;

[0058] (5) Pickling t...

Embodiment 2

[0067] Proceed as follows:

[0068] (1) First, artificially sort the quartzite raw material to remove impurities and foreign matter that are clearly observed by the naked eye;

[0069] (2) Place the artificially sorted quartz stone in a muffle furnace for calcination, heat it to 1000°C and keep it for 3 hours. After the heat preservation is over, take out the quartz stone and put it in flowing cold water for quenching;

[0070] (3) Dry the quenched quartz stone and crush it to 80-100 mesh with a double roller machine;

[0071] (4) Using an electromagnetic induction roller magnetic separator with a magnetic field strength of 2.0 Tesla, physically remove impurities from the crushed quartz sand, and after removing the magnetic substances in the quartz sand, use a high-voltage electric separator with a voltage of 25 Thousand volts, high-voltage electric separation and removal of impurities on quartz sand to remove charged impurities;

[0072] (5) Pickling the quartz sand treated...

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PUM

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Abstract

The invention discloses a process for preparing ultrahigh pure quartz sand through a silica raw material. The silica raw material is treated in such procedures to produce ultrahigh pure quartz sand with SiO2 content larger than 99.995% as manual sorting, calcining, water quenching, crushing, magnetic separation, electrostatic separation, ultrasonic pickling, flotation, ultrasonic alkali washing, drying, secondary magnetic separation, high temperature chlorination, dehydroxylation treatment and the like, and organic alkali washing, electrostatic separation, secondary magnetic separation, dehydroxylation treatment and high temperature chlorination are particularly added. The process for purifying quartz sand provided by the invention is obvious in effect, high in product purity, low in production cost increase and capable of meeting the requirements of such industrial production on raw materials as quartz glass, etc.

Description

technical field [0001] The invention relates to the field of quartz sand production technology, in particular to a technology for preparing ultra-high-purity quartz sand from silica raw materials. Background technique [0002] Ultra-high purity quartz sand generally refers to SiO 2 Quartz sand with a content higher than 99.99% has excellent chemical stability, high insulation and voltage resistance and extremely low volume expansion coefficient. It is an indispensable and important raw material for high-tech industries such as electronic core guides, photoconductive communication materials, and solar cells. Its high-end products are widely used in large-scale integrated circuits, solar cells, optical fibers, lasers, aerospace, military and other industries. The purity of quartz sand and the type and content of impurity elements directly affect the quality of the product. [0003] To obtain high-purity quartz sand, it needs to be purified. At present, the purification pr...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 陆春华唐明亮刘宝陶亚秋杨学根
Owner 南京工业大学东海先进硅基材料研究院
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