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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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.
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.
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
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
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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
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.
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.
Silica sand is a general term for quartz sand with high content of silicon dioxide (SiO2), which is distributed in layers or sand dunes on the ground.
In estuaries or coasts, silica sands are deposited with shore sand, collectively referred to as natural silica sands.
The standard for composing silica sand must contain at least 95% silicon dioxide and 0.6% iron oxide.
The difference between the mining and processing methods of silica sand is as follows:
Artificial silica sand, washed sand, scrubbed sand, selected (flotation) sand, etc...
Due to the high melting point and low thermal expansion coefficient of silica sand, it exerts good fire resistance performance under high temperature exposure.
Application
Silica sand is a common industrial raw material, widely used in glass, casting, ceramics and refractory materials, metallurgy, construction, chemicals, plastics, rubber, abrasives, coatings and other industries.