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Preparation method of highly pure quartz sands

A technology of high-purity quartz sand and quartz sand, which is applied in chemical instruments and methods, wet separation, silica, etc., can solve the problems that the content cannot meet the use requirements, the added value of the product is low, and the use of acid is reduced. Good impurity removal effect, thorough separation of impurities, and effect of improving efficiency

Active Publication Date: 2016-09-21
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

[0003] At present, the preparation of high-purity quartz sand in my country mainly uses high-quality high-purity vein quartz for processing. The process is relatively simple, and the large-scale production of quartz sand often contains too many impurities. 2 The content cannot meet the requirements of use, the added value of the product is low, and a large amount of acid is used for pickling in the process, especially the hydrofluoric acid containing fluorine brings great pressure to the environment, so it is urgent to find a method that can obtain SiO 2 Preparation method of high-purity quartz sand with high content and greatly reduced acid consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] S1 Rough selection: choose quartz stone with a silica content of not less than 99.3% as raw material, clean the raw material to remove impurities, and then use a crusher to crush the raw material into particles with a particle size of 5mm.

[0035] S2 Calcination and water quenching: After calcining the crushed particles in a muffle furnace at 400°C, take out the particles and put them in an ice-water mixture to quench for 10s, wash them, and then soak them in water at a temperature of 40°C for 1min. After the particles were taken out, they were washed with deionized water and dried.

[0036] S3 Electric separation and magnetic separation: put the particles into a wet mill and grind them to 50 mesh, apply a DC electric field with a strength of 200V / cm to the 50 mesh particles at 150°C, and apply the electric field for 1h. Then apply a magnetic field strength of 5000GS to magnetically separate in the magnetic separator, grind the particles after magnetic separation to 150 ...

Embodiment 2

[0044] S1 Rough selection: choose quartz stone with a silica content of not less than 99.3% as raw material, clean the raw material to remove impurities, and then use a crusher to crush the raw material into particles with a particle size of 15mm.

[0045] S2 Calcination and water quenching: After calcining the crushed particles in a muffle furnace at 1300°C, take out the particles and put them in an ice-water mixture to quench for 20 seconds, wash them, and then soak them in water at a temperature of 50°C for 3 minutes. After the particles were taken out, they were washed with deionized water and dried.

[0046] S3 Electric separation and magnetic separation: put the particles into a wet mill and grind them to 100 mesh, apply a DC electric field with a strength of 400V / cm to the 100 mesh particles at 250°C, and apply the electric field for 2 hours. Then apply a magnetic field strength of 7000GS to magnetically separate in the magnetic separator, grind the particles after magn...

Embodiment 3

[0054] S1 Rough selection: choose quartz stone with a silica content of not less than 99.3% as the raw material, clean the raw material to remove impurities, and then use a crusher to crush the raw material into particles with a particle size of 8mm.

[0055] S2 Calcination and water quenching: After calcining the crushed particles in a muffle furnace at 700°C, take out the particles and put them in an ice-water mixture to quench for 15 seconds, wash them, and then soak them in water at a temperature of 45°C for 2 minutes. After the particles were taken out, they were washed with deionized water and dried.

[0056] S3 Electric separation and magnetic separation: put the particles into a wet mill and grind them to 80 mesh, apply a DC electric field with a strength of 300V / cm to the 80 mesh particles at 200°C, and apply the electric field for 1.5h , and then apply a magnetic field strength of 6000GS to magnetically separate in the magnetic separator, grind the particles after ma...

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Abstract

The invention discloses a preparation method of highly pure quartz sands. The method comprises the following steps: 1, roughing: cleaning a raw material, and crushing the cleaned raw material; 2, carrying out calcining and water quenching: calcining the crushed raw material, taking out particles, and quenching the particles in an ice-water mixture; 3, carrying out electric separation and magnetic separation: milling the quenched particles, carrying out electric separation and magnetic separation twice, and carrying out pulse magnetic field treatment; 4, pickling: immersing a material obtained in step 3 in a hydrochloric acid solution, filtering the immersed material, dialyzing the obtained first filtrate to recover hydrochloric acid, preparing a first mixed acid by using the recovered hydrochloric acid and a sulfuric acid solution, immersing quartz sands in the first mixed acid, filtering the immersed quartz sands, dialyzing the obtained second filtrate to obtain recovered mixed acid, preparing a second mixed acid by using the recovered mixed acid and a nitric acid solution, immersing the quartz sands in the second mixed acid, adding the immersed quartz sands to a sodium carbonate solution, and flushing the quartz ands; 5, floating the flushed quartz sands; and 6, drying the floated quartz sands. The preparation method allows highly pure quartz sands with the SiO2 content to be not lower than 99.995% to be produced, and takes a greatly lower acid amount than traditional methods.

Description

technical field [0001] The invention relates to the field of inorganic material processing. More specifically, the present invention relates to a method for preparing high-purity quartz sand. Background technique [0002] Quartz glass is widely used in the manufacture of integrated In the circuit, the main products of quartz glass are high-purity high-temperature resistant quartz glass tubes for large-scale integrated circuits, arc quartz crucibles, quartz glass for optical communications and quartz glass for electric light sources. The main raw material of quartz glass is high-purity quartz sand. High-purity quartz sand has excellent chemical stability, high insulation and voltage resistance and extremely low volume expansion coefficient. An important raw material indispensable to the industry is the basic raw material for the production of quartz crucibles, single crystal silicon rod containers, and chips. High-purity quartz sand generally refers to SiO 2 Quartz powder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12B03B7/00
CPCB03B7/00C01B33/12C01P2006/80
Inventor 张勋张凤凯刘祥友李玉军石坤
Owner 江苏凯达石英股份有限公司
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