Dried food! Major application areas and technical specifications requirements of quartz sand

Quartz sand is an important industrial mineral raw material, widely used in industries such as filter media, glass, ceramics and refractory materials, smelting, construction, chemical and machinery, fillers, electronics, etc.

1. Quartz sand for glass industry

As the main raw material for the glass industry, quartz sand has quality requirements mainly reflected in three aspects: chemical composition, stability, and particle size composition.

2. Mechanical industry

The quartz sand used for forging has a high content of silicon dioxide and low content of other components, which is conducive to ensuring fire resistance. Therefore, the content of silicon dioxide is used as the main acceptance criteria for quartz sand used for forging.

(1) Cast steel sand: The content of silicon dioxide should be greater than 97%;

(2) Cast iron sand: The content of silicon dioxide should be greater than 85%;

(3) Sand for non-ferrous alloy forging: The content of silicon dioxide should be greater than 75%;

(4) Abrasive sand: with good roundness and no sharp edges, with a particle size of 0.8-1.5mm, SiO2>98%，Al2O3<0.72%，Fe2O3<0.18%；

(5) Chemical industry rust removal and sandblasting:

Require SiO2>99.6%, Al2O3<0.18%，

Fe2O3<0.02%， The particle size is 50-70 mesh, the particle shape is spherical, and the Mohs hardness is 7.

3. Superhard material

At present, the silicon carbide produced in China's industry is divided into two types: black silicon carbide and green silicon carbide.

Black silicon carbide is mainly made from quartz sand, petroleum coke, and high-quality silica as raw materials, and is smelted at high temperatures in a resistance furnace. Green silicon carbide is mainly made from petroleum coke and high-quality silica, with salt added as an additive, and is smelted at high temperature in a resistance furnace.

4. Chemical industry

In the field of chemical processing, quartz sand is the main raw material for producing potassium silicate, sodium silicate, and various forms of silica.

The production of sodium silicate requires high purity of quartz sand, at least reaching the scale of container glass grade quartz sand. For example, iron (Fe2O3) should be less than 0.03%, and the heavy mineral content should be less than 5 × 10-6. However, it has higher requirements for Al2O3 and CaO, both of which should be less than 0.1%. In some cases, the requirements are even higher, with their contents ranging from 0.01% to 0.02%.