High-purity quartz sand is also called silica sand, silicon powder, and silicon dioxide powder. It is widely used in industries such as semiconductors, electronics, optical fibers, lighting, and solar energy. The soaring demand has also made people wonder how to process quartz ore into high-purity quartz sand.

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Where is high purity quartz mined?

High purity quartz is a quartz product with extremely high purity of SiO2 and extremely low content of impurity after processing and purification of crystal, vein quartz, quartzite, granite pegmatite and other ores as raw materials. Economically mineable high-purity quartz deposits are rare and unevenly distributed. It is mainly distributed in 7 countries including the United States, Norway, Australia, Russia, Mauritania, China, and Canada.

The Spruce Pine deposit in USA and the Kyshtym deposit in Russia are famous quartz deposits.

High purity quartz sand processing process

We get quartz lumps by using open pit or dredging mining methods. To make high purity quartz sand, the raw quartz ore needs to go through the following quartz sand processing processes which can be divided into four stages: preparation process, pre-beneficiation process, beneficiation process and deep purification process.

6 quartz sand processing processes

In practice, we usually combine these methods to purify quartz sand. The following six quartz sand processing processes (also known as quartz sand beneficiation methods) are available for reference.

1. Comminution, classification, and magnetic separation (Quartz sand purification process of a company in Anhui)
Raw ore: quartzite from Fengyang, Anhui, with SiO2 content of 99.01% and Fe2O3 content of 0.118%;
Quartz sand concentrate: The Fe2O3 content in the concentrate is 0.02%.

Picture 1 Quartz sand purification process of a company in Anhui

2. Comminution, classification, magnetic separation, and flotation (quartz sand purification process of a company in Fengyang, Anhui)
Raw ore: quartz sand in Anhui, its SiO2 content is 99.1%-99.3%, and the Fe2O3 content is 150-200PPM;
Quartz sand concentrate: The SiO2 content in the concentrate is 99.62%, and the Fe2O3 content is 0.%.

Picture 2 Quartz sand purification process of a company in Fengyang, Anhui

3. Roasting, water quenching, acid leaching, and flotation (quartz sand purification process of a company in Donghai, Jiangsu)
Raw ore: vein quartz with Fe content of 765.3 mg/kg.
Quartz sand concentrate: The Fe content of the concentrate is 0.35mg/kg.

Picture 3 Quartz sand beneficiation process of a company in Donghai, Jiangsu

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4. Scrubbing, grading, grinding, magnetic separation, reverse flotation (the purification process of kaolin associated quartz sand ore in a laboratory)
Raw ore: kaolin associated quartz sandstone in the North Sea, SiO2 content 98.32%, Fe2O3 content .29μg/g;
Quartz sand concentrate: the content of SiO2 is 99.89%, and the content of Fe2O3 is 74μg/g.

Picture 4 the purification process of kaolin associated quartz sandstone in a laboratory

5. Roasting, water quenching, magnetic separation, flotation, acid leaching (quartz sandstone purification process in a laboratory)
Raw ore: quartz sandstone with SiO2 content 99.02%, Fe2O3 content 178.2μg/g;
Quartz sand concentrate: the content of SiO2 is 99.99%, and the content of Fe2O3 is 5.0μg/g.

Picture 5 quartz sandstone purification process in a laboratory

6. Ultra-fine comminution, classification, flotation, microwave-assisted acid leaching (vein quartz purification process in a laboratory)
Raw ore: vein quartz rocks from Shangrao, Jiangxi, with SiO2 content of 99.58% and Fe2O3 content of 0.03%;
Quartz sand concentrate: high-purity quartz sand (electronic grade) contains 99.98% SiO2 and 0.% Fe2O3; high-purity quartz sand (filler grade) contains 99.63% SiO2 and 0.% Fe.

Picture 6 vein quartz purification process in a laboratory

Conclusion

The high purity quartz sand (HPQ) is one of the main materials in the silica and silicon industry field.

It is produced by the crystal, quartz sandstone, and vein quartz, powder quartz, granite quartz through and by the processing and creating ways of crushing, grinding, classification, sorting, chemical washing, beneficiation leaching, thermal processing, and so on.

Author : Jordan

Jordan is the writer of the blog with a broad knowledge of this industry. Most importantly, he hopes to help you in your projects sincerely.

Quartz Sand Production Line

[Introduction]: Quartz sand purification is removal of a small amount of impurities and the high difficulty separation technique to obtain refined quartz sand or high purity quartz sand. The purification technologies of quartz sand at home and abroad are washing, classifying and desliming, scrubbing, magnetic separation, flotation, acid leaching, microbial leaching, etc.

[Application]: Quartz sand dressing Production Line is suitable for quartz sand containing iron or mica.

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