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, paints, adhesives. The zinc oxide powder is transparent, has a high energy band gap, and an exciton-binding energy. It also emits light at room temperatures with excellent performance. 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 and tasteless. It becomes yellow upon heating, turns white after cooling and sublimates at 1800degC. The concealing ability is about half of that of 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. It is 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 paints or thermometers to produce color-changing paints or thermometers. 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 oxidizing it with air.
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
After melting the zinc ingot produced by electrolysis, it is placed in a high-temperature-resistant crucible. It is then melted and vaporized at a temperature of 12501300. Hot air is introduced to oxidize it.
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 rolled into balls with a 1:0.5 : 0.05 ratio. After reduction at 1300degC and smelting, the zinc ore powder in the ore ball 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 reacts with sulfuric to form zinc sulfate. The zinc acetate and zinc hydroxide are then reacted to produce 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 and cooling. Zn(OH)2-ZnO+H2O

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