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Physical properties of Zinc Oxide Powder
White powder, hexagonal crystals or white powder. It is odorless, tastesless and non-sandy. It becomes yellow upon heating, turns white after cooling and sublimates on reaching 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, ammonium chloride solution and water. Insoluble with ethanol 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 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 known American method) utilizing zinc ore and wet (also known as American method).
2. The indirect method.
Reaction equation: 2Zn+O2=2ZnO
After melting the electrolyzed ingot of zinc, it is placed in a high-temperature resistant pot, where it is made to melt and vaporize. Hot air is then introduced to oxidize the product.
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 powder becomes zinc vapor. This zinc vapor is then oxidized and captured to produce a zinc oxide finished product.
3. Wet method
Zinc ash reacts with sulfuric to form zinc sulfate. This is then combined with ammonia and sodium carbonate to create zinc oxide. 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 drying, calcination cooling and pulverization. Zn(OH)2-ZnO+H2O
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