Physical properties of Zinc Oxide Powder
Appearance: white powder, hexagonal crystals. It is odorless, tastesless, and does not sand. When heated up to 1800degC, it sublimates and turns white. 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.
Chemical properties of Zinc Oxide Powder
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 paints or thermometers to produce color-changing paints or thermometers. ZnO, which has an astringent quality and a certain bactericidal property, is commonly used in medicine. 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 called French method) utilizing zinc ingots, direct (also known American method) utilizing zinc ore and wet (also known as American 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 pot, melted and vaporized at a temperature of 13001400°C, introduced hot air for oxidation, and finally the zinc dioxide is cooled.
Direct method Reaction equation:
Operation Method: In a proportion of 1:0.5 to 0.05, the roasted zinc powder (or zinc containing material), coke (or anthracite) and limestone are formed into balls. After reduction at 1300degC and smelting, the zinc ore powder in the ore oxide is reduced into zinc vapor. This zinc vapor is then oxidized with air and captured to get a finished zinc oxide.
3. Methode de l’eau
The reaction between zinc ash and sulfuric acid generates zinc sulfate. Zinc sulfate can then be reacted to create zinc oxide by combining it with ammonia, sodium carbonate, and ammonia-water. The reaction is described by the following equation:
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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