Quartz Sand VS Silica Sand
Silica sand and quartz sand do not belong to the same kind of substances. Both of them use silica as the main component. However, quartz sand is a crystal and is made of quartz stone. Silica sand is made of sand and gravel containing silica. The appearance is quite different, and the manufacturing method is also different.
Silica sand includes ordinary silica sand, refined silica sand and high purity silica sand. The content of silica in ordinary silica sand is between 90% and 99%, and the content of iron oxide is less than 0.02%; the content of silica in refined silica sand is between 99% and 99.5%, and the content of iron oxide is less than 0.015%; high-purity quartz The content of silica in sand is between 99.5% and 99.9%, and the content of iron oxide is less than 0.001%.
Silica sand with higher purity is milky white. When there is a large amount of impurities, silica sand will appear brownish red, light brown and other colors. The melting point of silica sand is about 1750℃, the particle size is between 0.02mm and 3.35mm, and it is insoluble in removing hydrogen and fluorine. Acids other than acids have good chemical stability, electrical insulation, and wear resistance.
The major glass producing countries in the world, such as the Soviet Union, the United States, Belgium and other countries, mostly use natural silica sand as raw materials for glass. The quality of natural silica sand in my country is relatively poor. Generally, silica sand crushed by quartz sandstone is used as the raw material for glass.
Quartz sand is a quartz particle produced by crushing quartz stone. Quartz stone is a non-metallic mineral, a hard, wear-resistant, and chemically stable silicate mineral. The color of quartz sand is milky white, or colorless and translucent, with a Mohs hardness of 7.
Quartz sand is an important industrial mineral raw material, non-chemical dangerous goods, widely used in glass, casting, ceramics and fireproof materials, smelting ferrosilicon, metallurgical flux, metallurgy, construction, chemical industry, plastics, rubber, abrasives, filter materials and other industries.
The grade of raw quartz sand in industry is getting lower and lower. In order to meet the needs of industry, the grade can be improved through the beneficiation process. There are mainly the following purification methods:
Scrubbing refers to the removal of thin-film iron, adhesive and muddy impurity minerals on the surface of the quartz sand by mechanical force and the abrasive force between the sand grains, and further smashing the unconsolidated mineral aggregates, and then further purifying the quartz sand through classification operations Effect. Today there are mainly rod scrubbing and mechanical scrubbing. The main factors affecting the scrubbing effect are the structural characteristics and configuration of the scrubbing machine; the secondary factors are scrubbing time and scrub concentration (the scrubbing concentration is generally 50%-60%). The main methods include mechanical scrubbing, rod scrubbing, high-efficiency and powerful scrubbing with drugs, and ultrasonic scrubbing.
2. Magnetic separation
Magnetic separation is mainly used to remove magnetic minerals in quartz sand. For example, weak magnetic minerals such as hematite, limonite, and biotite can be removed by a strong magnetic machine, while strong magnetic minerals such as magnetite can be removed by a weak magnetic separator Remove.
Flotation is used to remove some impurities that cannot be removed by magnetic separation, such as feldspar and mica in the quartz sand, to further improve its purity.
4. Acid leaching
Acid leaching utilizes the characteristic that quartz is insoluble in acid (except HF acid), and other impurity minerals can be dissolved in acid, which can realize further purification of quartz.
5. Microbial leaching
It refers to the use of microorganisms to leaching thin film iron or immersion iron on the surface of quartz sand particles. This is a newly developed iron removal technology.
1. stones enter the warehouse
2. rough break
3. fine break
4. sand making machine
5. sand washing