Characteristics and application of high-purity quartz sand raw materials

30/08/2021
|In Industry News
|By ALPA Powder

Quartz sand includes ordinary quartz sand, refined quartz sand, high-purity quartz sand, and fused quartz sand. High-purity quartz sand generally refers to fine quartz powder with a SiO2 content of more than 99.9%. It is a neutral inorganic filler and does not react with the filler. It is a very stable mineral filler.

The difference between high purity quartz sand and ordinary quartz sand

Type SiO2 Fe2O3 Granularity range
Ordinary quartz sand 90-99% 0.02-0.06% 5-220
High purity quartz sand 99 .5-99.9% ≤0.001% 1-0.5mm
0.5-0.1mm
0.1-0.01mm
0.01-0.005mm

High-purity quartz sand has unique physical and chemical properties, especially its inherent crystal structure, crystal shape and crystal lattice change law, making it resistant to high temperature, small thermal expansion coefficient, piezoelectric effect, corrosion resistance, high insulation, and resonance effect And unique optical characteristics.

Chemical composition of high-purity quartz sand (μg/g)

Element AI Fe Ca Ng Ti Na Cu B Mn K
Content 17.25 2.06 0.92 1.36 2.13 1.87 0.02 0.03 0.02 0.92

 Particle size distribution of high purity quartz sand

Purpose Particle size distribution (mesh)
Sand for Quartz Tube 40~100
Sand for Quartz Crucible 60~160
Sand for Quartz Ingot 80~180

 Raw material of high-purity quartz sand

  • Natural Crystal

The advantages are high purity, low impurity content, less inclusions, and pure crystals can be directly used to produce electro-quartz.

The disadvantage is that the softening point is low, and a large amount of industrial production is difficult to ensure the uniformity of the mineral structure and the consistency of the internal quality and chemical content; the crystal reserves are small, and the distribution is uneven, and there are few high-grade crystals.

  • Natural rock minerals (vein stone, quartz stone, etc.)

The advantage is that the raw material reserves are abundant and there are many types.

The disadvantage is that the direct extraction of ultra-pure quartz sand is currently the most advanced technology for producing ultra-pure quartz sand in the world, and only the United States, Japan, and Germany have mastered this technology.

Application of high purity quartz sand

  • Quartz glass

Known as the “King of Glass”, it is widely used in aerospace technology, light curing, circuit manufacturing, semiconductors, ultraviolet sterilization, laser technology, high-tech lighting sources and other fields and civilian fields.

  • Electronics industry

Packaging materials, basic electronic materials, used to prepare monocrystalline silicon and polycrystalline silicon.

  • Photovoltaic industry

Solar panels, semiconductor chip materials, etc.

 

Article source: China Powder Network