Production process of preparing high-purity silica by virtue of quartz sands

A technology of silica and production technology, which is applied in the chemical industry, sustainable manufacturing/processing, inorganic chemistry, etc., and can solve the problems such as difficulty in guaranteeing the purity of high-purity ultra-fine quartz powder, large differences in impurity content, and large consumption of coal and natural gas , to achieve the effect of reducing energy consumption, improving purity and reducing corrosion

Inactive Publication Date: 2015-04-29
新沂市永恒熔融石英有限公司
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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.
At the same time, the processing of quartz products is also known as a large energy consumer. In the traditional process, a large amount of electric energy and heat energy are required, which requires a large amount of coal and natural gas; at the same time, in the traditional dry crushing process, fine dust will give the operation irreversible physical damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A production process for preparing high-purity silicon dioxide from quartz sand, comprising the following steps: 1) crushing; 2) calcining; 3) water quenching; 4) grinding; 5) magnetic separation; 6) electrostatic separation; 7) pickling ; 8) cleaning with deionized water; 9) drying;

[0027] Wherein, in the process 1), while pulverizing, abrasive materials are added for scrubbing and desliming, and the abrasive materials include: 20wt% boron carbide, 30wt% silicon carbide and 50wt% corundum;

[0028] In operation 3), the liquid used for water quenching is an aqueous solution comprising 0.5wt% potassium chloride and 0.2wt% ferric nitrate; when water quenching, an ultrasonic instrument is arranged in the liquid used for water quenching, and the ultrasonic frequency of the ultrasonic instrument is 150Hz;

[0029] In process 9), the heat used for drying comes from the waste heat in the calciner in process 2), and a heat collecting cabin is arranged on the outer wall of th...

Embodiment 2

[0033] A production process for preparing high-purity silicon dioxide from quartz sand, comprising the following steps: 1) crushing; 2) calcining; 3) water quenching; 4) grinding; 5) magnetic separation; 6) electrostatic separation; 7) pickling ; 8) cleaning with deionized water; 9) drying;

[0034]Wherein, in the step 1), abrasives are added for scrubbing and desliming while pulverizing, and the abrasives preferably include: 25wt% boron carbide, 40wt% silicon carbide and 35wt% corundum.

[0035] In operation 3), the liquid used for water quenching is an aqueous solution comprising 1.5wt% potassium chloride and 0.4wt% ferric nitrate; during water quenching, an ultrasonic instrument is arranged in the liquid used for water quenching, and the ultrasonic frequency of the ultrasonic instrument is 200Hz.

[0036] In process 9), the heat used for drying comes from the waste heat in the calciner in process 2), and a heat collecting cabin is arranged on the outer wall of the calcinin...

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Abstract

The invention discloses a production process of preparing high-purity silica by virtue of quartz sands. The production process comprises the following steps: 1) crushing; 2) calcining; 3) water quenching; 4) grinding; 5) magnetic separation; 6) electrostatic separation; 7) pickling; 8) cleaning by deionized water; and 9) drying, wherein scrubbing and desliming are carried out by adding an abrasive while crushing, and the abrasive includes boron carbide, silicon carbide and corundum; heat used by drying is from waste heat in a calciner, a heat collection cabin is arranged on the outer wall of the calciner, and the heat is introduced to the ninth procedure for drying with the arrangement of a plurality of blowers and a thermal insulation pipeline, and a layer of polyimide membrane is arranged on the inner wall of the thermal insulation pipeline. By improving the traditional process, the production process is capable of optimizing a technical formula and integrating procedure structures. In addition, by fully utilizing the waste heat of equipment, a novel green and environmental-friendly process is provided, so that while ensuring high purity of the silica, the production energy consumption is greatly lowered, the production cost is saved, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a natural mineral purification process, in particular to a purification process for high-purity silicon dioxide, in particular to a production process for preparing high-purity silicon dioxide from quartz sand. Background technique [0002] High-purity silica has excellent physical and chemical properties, high hardness, high temperature resistance, corrosion resistance, low electrical conductivity, good wave transmission performance, and stable performance. In particular, its internal molecular chain structure, crystal shape and lattice change rules make it have a small thermal expansion coefficient, high insulation, piezoelectric effect, resonance effect and its unique optical characteristics. It is used in many high-tech fields such as new electric light sources, Microelectronics, high-insulation sealing, aerospace, national defense and other fields have been more and more widely used. [0003] With the rapid development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
CPCY02P20/10Y02P20/129
Inventor 王应三管俊芳李欣晓玉王泽龙
Owner 新沂市永恒熔融石英有限公司
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