Introduction and preparation method of zinc oxide

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 as well as silicates products, rubber, paints ointments adhesives food, batteries and flame retardants. The zinc oxide powder is transparent, has a high energy band gap, has excellent light emitting properties at room temperature, and exhibits a high exciton-binding energy. 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 other related fields.
Physical properties of Zinc Oxide Powder
Appearance: white powder, hexagonal crystals. It is odorless, tastesless, and does not sand. It becomes yellow upon heating, turns white after cooling and sublimates at 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. Its main advantage is that ZnS, which is also white, does not 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 calcinated 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 known the French method) utilizing zinc ingots, direct (also known the American method) utilizing zinc ore and wet (also called a wet method).
2. The indirect method.
Reaction equation: 2Zn+O2=2ZnO
Operation: The zinc ingot produced by electrolysis is heated to 600700°C to melt. It is then placed in a high-temperature-resistant crucible. At 12501300°C, it is made to melt and vaporize. Hot air is introduced to oxidize.
Direct method Reaction equation:
C+O2=CO2
CO2+C=2CO
ZnO+CO=Zn (steam)+CO2
Zn (steam)+CO+O2=ZnO+CO2
The zinc ore powder, anthracite and limestone are combined in the ratio 1:0.5 to make balls. After reduction at 1300degC and smelting, the zinc ore powder in the ore is reduced into zinc vapor. This zinc vapor is then oxidized with air and captured to get a final product of zinc dioxide.
3. Wet method
Zinc ash, when combined with sulfuric acid, produces zinc sulfate. It is then reacted in a similar way with sodium carbonate or ammonia 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, precipitation and drying the zinc hydroxide, followed by calcination, cooling and pulverization. Zn(OH)2-ZnO+H2O

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