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Zinc oxide powder
Zinc oxide powder
The chemical formula for zinc oxide is ZnO. Water is not soluble, but it dissolves in acid and strong alkali. Zinc dioxide powder is an additive widely used by chemical manufacturers. It can be found in plastics and silicate products as well as synthetic rubber, lubricants paints ointments adhesives food, flame retardants batteries. The zinc oxide powder is transparent, has a high energy band gap, and exhibits excellent light emission at room temperature. It’s used in liquid-crystal displays, thin film transistors, light emitting diodes and other semiconductor products. As a nanomaterial, micro-particles of zinc oxide have also started to play a significant role in related fields.
Physical properties of Zinc Oxide Powder
Appearance: white powder, hexagonal crystals. It is odorless, tastesless and non-sandy. It becomes yellow upon heating, turns white upon cooling and sublimates after being heated up to 1800degC. The hiding power of this product is about half that for zinc sulfide or titanium dioxide. The tinting strength of basic lead is two times that of titanium dioxide.
Solubility : soluble with acid, concentrated alkali, ammonia, and ammonium-salt solution. Insoluble with water and ethanol.
Zinc oxide powder chemical properties
Zinc oxide powder
This white pigment is commonly called zinc white. The ZnS pigment is also white, so it doesn’t turn black when exposed to H2S. ZnO changes gradually from white to light to lemon yellow when heated. As it cools down, the yellow disappears. It can be added to a paint to produce a paint that changes color or to a thermometer for a thermometer that changes color. ZnO, which has an astringent quality and a certain bactericidal property, is commonly used as ointment. ZnO may also be used to create catalysts.
Preparation of Zinc Oxide Powder
1. Direct method
1. You can get it by calcining Zinc Carbonate. ZnCO3=ZnO+CO2|
2. The zinc hydroxide is calcined and decomposed to obtain the metal.
3. Zinc is made by melting zinc oxide at high temperatures and then oxidizing it.
4. This is obtained by oxidizing molten zinc.
5. Methods include indirect (also called French method) utilizing zinc ingots, direct (also called American method) utilizing zinc ore and wet (also known).
2. The indirect method.
Reaction equation: 2Zn+O2=2ZnO
The following is the operation method: after heating the zinc ingot produced by electrolysis up to 600700°C to melt, place the ingot in a high-temperature-resistant crucible. Melt and vaporize it at a temperature of 12501300°C, introduce hot air for oxidation, and cool the zinc dioxide produced. Cyclone Separation, the fine particles collected in a cloth bag and then the final product of zinc oxide obtained.
Direct method Reaction equation:
C+O2=CO2
CO2+C=2CO
ZnO+CO=Zn (steam)+CO2
Zn (steam)+CO+O2=ZnO+CO2
Operation Method: In a proportion of 1:0.5 to 0.05, the roasted zinc powder (or zinc containing material) is combined with anthracite and limestone. After reduction at 1300degC and smelting, the zinc ore powder in the ore was reduced to zinc vapor. This vapor is then oxidized with air and captured as a final product.
3. Wet method
Zinc sulfate can be prepared by reacting zinc-ash with sulfuric acid. It is then combined with ammonia and sodium carbonate to form zinc oxide. The reaction is described by the following equation:
Zn+H2SO4=ZnSO4+H2|
ZnSO4+Na2CO3=ZnCO3|+Na2SO4
ZnSO4+2NH3*H2O=Zn(OH)2|+(NH4)2SO4
The product is made from zinc carbonate.
zinc oxide
is obtained by washing and drying. ZnCO3-ZnO+CO2|
The zinc oxide product is made by washing, drying, calcination and cooling. Zn(OH)2-ZnO+H2O
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Zinc oxide powder
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