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Fused quartz block
Quartz powder (with quartz sand) is also known as silicon powder. Quartz sand is a kind of hard, wear-resistant, chemically stable silicate mineral, its main mineral composition is SiO2, quartz sand color is milky white, or colorless translucent, hardness 7, brittle no cleavage, shell fracture, grease luster, density of 2.65, [1] bulk density (20-200 mesh is 1.5). Its chemical, thermal and mechanical properties have obvious anisotropy, insoluble in acid, slightly soluble in KOH solution, melting point 1650℃. After the quartz stone mined from the mine is processed, the product with a fineness below 120 mesh (less than 120 mesh) is called quartz sand. More than 120 purpose products are called quartz powder.
Chinese name Quartz powder foreign name Quartz powder specific name Silicon powder can be hard, wear-resistant, chemical stability hardness 7 density 2.65 melting point 1650℃
catalogue
1 Basic Introduction
2 Production process
3 Classification
4 Quality Standards
5 Uses
Basic introduction
Refined ultrafine quartz powder
Refined ultrafine quartz powder
Quartz powder (with quartz sand) is also known as silicon powder. English name quartz sand, silica flour; ground quartz.
Quartz powder is a hard, wear-resistant, chemically stable mineral, its main mineral composition is quartz, its main chemical composition is SiO2, quartz sand color is milky white, or colorless translucent, Mohs hardness 7, brittle no cleavage, shell fracture, grease luster, density of 2.65, [1] bulk density (20-200 mesh is 1.5), Its chemical, thermal and mechanical properties have obvious anisotropy, insoluble in acid, soluble in NaOH, KOH aqueous solution above 160℃, melting point 1650℃. After the quartz stone mined from the mine is processed, the general particle size of the product on the 120 mesh screen is called quartz sand. The product after 120 mesh sieve is called quartz powder.
Production technology
Quartz powder is divided into two production methods: dry method and water method, various conventional specifications: 100M, 150M, 200M, 325M, 400M, 600M, 1500M and 2000M(M is the mesh number). In addition, it can also be processed according to customer requirements, and the requirements of particle size distribution can also be processed.
Common quartz powder
Common quartz powder
1
Dry production of quartz powder, the main equipment are stone crusher, crusher, vibrating screen and so on. The process flow is quartz ore processed into smaller stone by the stone crusher, the stone is processed by the grinder sand, and then screened by the vibrating screen, the iron is removed by the magnet bar and the magnet in the screening process, and then the storage is completed.
2
Water production of quartz powder, the main equipment are stone crusher, stone roller, grill, vibrating screen, water system and so on.
The process flow is roughly as follows: quartz ore is processed into smaller stone by the stone machine, the stone is then rolled into sand, the water is constantly added when rolling, the sand flows into the sedimentation tank, and then the sand in the sedimentation tank is transported into the oven to bake into dry sand, and then through the vibrating screen screening, in the screening process, the use of magnet rod and magnet removal iron, and then the storage is completed.
The quartz powder produced by dry process can be divided into two grades: ordinary quartz powder and refined quartz powder. When quartzite ore is mined from the mountain, it has a yellowish brown skin. Select the smaller quartz ore directly crushing and screening products called ordinary quartz powder, the appearance of yellow brown and white, its advantage is that the price is cheap, the disadvantage is more impurities, so it is used in the construction industry. Select the large mineral, after the artificial removal of the surface of the yellow brown skin, and then processed is refined quartz powder, its appearance is white, shiny, like white sugar. Due to time-consuming processing materials, so the price is higher.
The quartz powder produced by water method is divided into ordinary quartz powder and refined quartz powder. The smaller quartz ore is processed into ordinary quartz powder, and the larger quartz ore is processed into refined quartz powder. Compared with dry quartz powder, water quartz powder due to the production process, less equipment iron and water washed away impurities, such as iron content and impurities are less than dry quartz powder, but because of its processing is more expensive, so the price is higher.
sort
Industrial quartz powder (sand) is often divided into: ordinary quartz sand (powder), refined quartz sand, high purity quartz sand, molten quartz sand and silica powder. [1]
Ordinary quartz sand (powder)
SiO2≥ 90-99% Fe2O3≤ 0.06-0.02%, refractoriness 1750-- 1800℃, the appearance of some large particles, the surface has yellow skin capsule. Particle size range 1-320 mesh, can be produced according to user requirements. Main applications: metallurgy, ink silicon carbide, building materials, enamel, cast steel, filter material, foam alkali, chemical industry, sandblasting and other industries.
Refined quartz sand (powder)
Also known as acid-washed quartz sand, SiO2≥ 99-99.5% Fe2O3≤ 0.02-0.015%, selected high-quality ores for complex processing. Particle size range of 1-380 mesh, can be produced according to user requirements, the appearance of white or crystalline. Main applications: filter material, glass, glass products, refractory materials, melting stone, precision casting, sandblasting, wheel grinding materials, etc.
High purity quartz sand (powder)
SiO2≥ 99.5-99.9% Fe2O2≤0.005%, is the use of 1-3 natural crystal stone and high-quality natural stone, carefully selected, fine processing. Particle size range 1-0.5mm, 0.5-0.1mm, 0.1-0.01mm, 0.01-0.005mm, can be produced according to user requirements. Main applications: glass, electronic filler, melting stone, precision casting, chemical industry, ceramics, etc.
Silica powder
SiO2:99.5%min-99.0%min,Fe2O3:0.02%max,Al2O3:0.3% max, size:200-2000 mesh, appearance of gray or gray white powder, refractoriness >1600℃. Bulk weight: 200 ~ 250 kg/m3.
Quality standard
Chemical composition index for the glass industry
Ore grade
SiO2
Al2O3
Fe2O3
TiO2
Cr2O3
remark
first-order
> 99
0.5
0.05
0.05
0.001
For special technical glass
Second level
> 98
1.0
0.1
Used in industrial technology and utensils
three-level
> 96
1.5
0.5
For tinted glass
Band four
> 95
3.0
0.5
For tinted glass
Chemical composition, index:
rank
SIO2-% ≥
AL2O3-% ≤
Fe2O3 ≤
CaO+MgO-% ≤
refractoriness
special
99.99
micro
0.01
micro
1750
first-order
99.9
0.05
0.02
0.05
1750
Second level
99.5
0.3
0.035
0.2
1730
three-level
98.5
0.5
0.06
0.5
1710
Band four
95.0
4.0
0.035
0.5
----
Five principles level
95.0
4.0
0.06
0.5
----
Cet 6
98.0
0.5
0.3
0.5
----
use
Quartz powder has no grades, only specifications. Because of its high whiteness, no impurities, low iron content, it has a wide range of applications.
1. Glass: the main raw materials of flat glass, float glass, glass products (glass jars, glass bottles, glass tubes, etc.), optical glass, glass fiber, glass instruments, conductive glass, glass cloth and special anti-ray glass
Second, ceramics and refractory materials: porcelain embryo and glaze, kiln with high silicon bricks, ordinary silicon bricks and silicon carbide and other raw materials.
Third, construction: concrete, cementitious materials, road building materials, artificial marble, cement physical properties test materials (i.e., cement standard sand), etc
Chemical industry: raw materials such as silicon compounds and water glass, filling of sulfuric acid tower, amorphous silica powder
5, machinery: the main raw materials of casting sand, grinding materials (sandblasting, hard grinding paper, sandpaper, emery cloth, etc.)
6. Electronics: high-purity metal silicon, optical fiber for communication, etc
Seven, rubber, plastic: fillers (can improve wear resistance)
Eight, paint: fillers (can improve the weatherability of paint).
9, metallurgy: silicon metal, ferrosilicon alloy and silicon aluminum alloy and other raw materials or additives, fluxes.
10, aviation, aerospace: its internal molecular chain structure, crystal shape and lattice change law, so that it has high temperature resistance, small thermal expansion coefficient, high insulation, corrosion resistance, piezoelectric effect, resonance effect and its unique optical characteristics.
Commonly used packaging is 25KG and 50KG.
Reference material
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