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Introduction and preparation method of zinc oxide


Zinc oxide powder

Zinc oxide powder

It is an organic substance that has a chemical composition of ZnO. ZnO is an oxide form zinc. The substance is not easily soluble or soluble with water. It can be dissolved in strong acids and alkali. Zinc oxide powder, an important chemical additive is used widely in plastics and silicate products. High transparency and good room-temperature light-emitting ability are some of the advantages that zinc oxide powder offers. You can use it in liquid crystal displays and thin-film transistors. It also makes light-emitting dimmers. Micro-particle zinc dioxide as a nanomaterial is also being used.


Zinc oxide powder’s physical characteristics


Property and appearance: hexagonal or white crystals. Non-sandy and tasteless. The substance turns yellow upon heating, then becomes white after cooling and finally sublimates upon being heated to 1800°C. This concealment power is twice that of zinc sulfide or titanium dioxide. It has twice the tinting power of basic lead carbonate.

Solubility: It is soluble in ammonia, concentrated alkali hydroxyxide and ammonia salt solutions, but not in water and alcohol.


Zinc oxide powder chemical properties



Zinc oxide powder

It is also known by the common name of zinc white. The advantage of ZnO is its inability to turn black when it comes into contact with H2S gas, as ZnS itself is white. ZnO changes gradually from light yellow to lemony yellow as it heats. As it cools down, the yellow disappears. You can mix it with paint, or add to a thermometer for a color changing paint. ZnO can be used to make medicine ointments because it has an anti-bacterial and astringent properties. ZnO can be used to create catalysts.


Making zinc oxide powder



1. Direct Method:


1. You can obtain it by calcining Zinc Carbonate. ZnCO3=ZnO+CO2|

2. You can get it by calcining or decomposing zinc hydroxide.

3. Zinc can be made by melting crude zinc oxide. Then, it is oxidized with high-temperature oxygen.

4. Obtained by the oxidation and fusion of molten Zinc.

5. These methods include: The indirect method, also known as the French Method using zinc ingot to make raw materials; the direct method with zinc ore (also known the American Method) and the dry method.


2. Method of indirect.


Reaction equation: 2Zn+O2=2ZnO

Instructions for operation: First heat the ingot of zinc made through electrolysis at 600700 degrees to melt. Next, transfer it to a heat-resistant crucible to make it melt. After it has vaporized, add hot air to cool it. Once it is cooled, use Cyclone separation to collect the fine particles with a cloth bag. The finished zinc oxide product is then obtained.

Direct method Reaction equation:

C+O2=CO2

CO2+C=2CO

ZnO+CO=Zn (steam)+CO2

Zn (steam)+CO+O2=ZnO+CO2

Instructions: A mixture of roasted zircon ore (or zinc-containing materials), anthracite, and limestone is used to make balls in a 1:0.5:0.05 ratio. Following reduction at 1300degC and subsequent smelting, zinc oxide in the ore particles is reduced to zinc vapour. The oxidized zinc is then captured and used as a raw material to produce zinc oxide.


3. Methode wet


The zinc ash reacts with sulfuric acids to create zinc sulfate. Next, ammonia and sodium carbonate react to make zinc oxide. Here is how the reaction works:

Zn+H2SO4=ZnSO4+H2|

ZnSO4+Na2CO3=ZnCO3|+Na2SO4

ZnSO4+2NH3*H2O=Zn(OH)2|+(NH4)2SO4

This product was made using zinc carbonate as the raw material.

zinc oxide

can be obtained by washing, drying and pulverizing. ZnCO3-ZnO+CO2|

The zinc oxide product is made from zinc hydroxide, which can be used as a raw material. This includes washing, precipitation and drying. Zn(OH)2-ZnO+H2O

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