High-purity quartz sand purification method

A high-purity quartz sand and purification method technology, which is applied in the field of high-purity quartz sand purification, can solve problems such as complex process and high technical requirements, and achieve the effects of complete removal of impurities, weakened acid adhesion, and saving production costs

Inactive Publication Date: 2017-09-08
安徽安顺硅基玻璃原料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the quartz sand currently produced has high purity, the process is often quite complicated and requires two firing processes, which requires high process technology, and it is difficult for ordinary enterprises to do so.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for purifying high-purity quartz sand, comprising the following steps:

[0024] (1) Water washing: Put the crude quartz sand into 80°C high-temperature and high-pressure water for cleaning, wherein the water vapor pressure is 0.5Mpa, and the cleaning time is 30min;

[0025] (2) Magnetic separation: put the cleaned quartz sand into a wet permanent magnet cylindrical magnetic separator for magnetic separation;

[0026] (3) Pickling: Put the magnetically separated quartz sand into a mixed acid for pickling for 7 hours, the pickling temperature is 40°C; the mixed acid is composed of oxalic acid, hydrochloric acid, formic acid, citric acid and water;

[0027] The specific process of acid leaching is: add the purchased 95% oxalic acid and appropriate amount of water to make a 20% oxalic acid solution, heat the oxalic acid solution to 35°C, slowly add 37% hydrochloric acid, the volume ratio of oxalic acid solution to hydrochloric acid is 5 : 1, add formic acid and ci...

Embodiment 2

[0033] (1) Water washing: Put the crude quartz sand into 85°C high-temperature and high-pressure water for cleaning, wherein the water vapor pressure is 0.6Mpa, and the cleaning time is 40min;

[0034] (2) Magnetic separation: put the cleaned quartz sand into a wet permanent magnet cylindrical magnetic separator for magnetic separation;

[0035] (3) Acid leaching: put the magnetically separated quartz sand into a mixed acid for 7.5 hours, and the acid leaching temperature is 50°C; the mixed acid is composed of oxalic acid, hydrochloric acid, formic acid, citric acid and water;

[0036] The specific process of acid leaching is: add the purchased 95% oxalic acid and appropriate amount of water to make a 20% oxalic acid solution, heat the oxalic acid solution to 36°C, slowly add 36% hydrochloric acid, the volume ratio of oxalic acid solution to hydrochloric acid is 5 : 1, add formic acid and citric acid at last to ensure that the concentration of formic acid is 0.9%, and the conc...

Embodiment 3

[0042] (1) Water washing: Put the crude quartz sand into 80°C high-temperature and high-pressure water for cleaning, wherein the water vapor pressure is 0.5Mpa, and the cleaning time is 35 minutes;

[0043] (2) Magnetic separation: put the cleaned quartz sand into a wet permanent magnet cylindrical magnetic separator for magnetic separation;

[0044] (3) Acid leaching: put the magnetically separated quartz sand into a mixed acid for 8 hours, and the acid leaching temperature is 40°C; the mixed acid is composed of oxalic acid, hydrochloric acid, formic acid, citric acid and water;

[0045] The specific process of acid leaching is: add the purchased 95% concentration of oxalic acid to an appropriate amount of water to make an 18% concentration of oxalic acid solution, heat the oxalic acid solution to 38°C, slowly add 37% hydrochloric acid, the volume ratio of oxalic acid solution to hydrochloric acid is 5 : 1, finally add formic acid and citric acid, ensure that the concentratio...

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PUM

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Abstract

The invention provides a high-purity quartz sand purification method, and relates to the technical field of quartz sand purification. The method comprises washing, magnetic separation, acid leaching, vacuumizing, water injection washing and dehydration processes, wherein high-temperature high-pressure water is adopted for washing; magnetic separation is performed in a wet type permanent magnet cylindrical magnetic separator; mixed acid for acid leaching is prepared from oxalic acid, hydrochloric acid, formic acid, citric acid and water; the mixed acid is reutilized for vacuumizing; acid-leached quartz sand is finally washed and dehydrated. The quartz sand purified by the method is high in purity, the SiO2 content is more than 99.99 percent, the process is simple, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of quartz sand purification, in particular to a method for purifying high-purity quartz sand. Background technique [0002] Quartz sand, also known as silica sand, is a common non-metallic mineral raw material with a wide range of applications. my country's quartz sand beneficiation, purification and deep processing development and utilization are relatively late, and are mainly used in the construction industry, glass manufacturing, ceramic industry and foundry industry. A common feature of these fields is the large demand for quartz sand and low quality requirements for raw materials. For the high-quality quartz sand produced in some places in my country, it can basically meet the demand for industrial sand without beneficiation or purification. [0003] At present, the quartz sand mineral processing and purification technology of the United States is the most advanced in foreign countries. It is characte...

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 黄永武黄林新
Owner 安徽安顺硅基玻璃原料有限公司
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