Specific Surface Area: Depending On The Particle Size, The Specific Surface Area Is Between 40-100m²/g Zinc Oxide

Preparation methods and common applications of zinc oxide

Zinc oxide can be prepared by a variety of methods, including calcination, hydrothermal, sol-gel and solution methods. Each method has its own characteristics and scope of application, and the appropriate preparation method can be selected according to specific needs. The calcination method is suitable for large-scale industrial production, while the sol-gel method can obtain zinc oxide powder with smaller particles and uniform distribution. The application of zinc oxide in the fields of environmental protection and new energy is also becoming more and more extensive, such as photocatalytic degradation of organic matter, solar cells, etc. With the advancement of science and technology and people's pursuit of high-quality life, the application scope of zinc oxide will continue to expand, and its importance will become increasingly prominent. In the future, through continuous research and innovation, zinc oxide is expected to create a better living and working environment for us.

Specifications

Calcination method

1.Direct calcination method:
Calcine zinc powder, zinc ore or zinc-containing waste slag at high temperature in the air to oxidize it to produce zinc oxide.
This method is suitable for processing raw materials with high zinc content and can be produced on a large scale in industry.
For example, zinc ore or zinc ash is mixed with coal and lime in a certain proportion and crushed, then pressed into balls by a coal briquette machine, dried and smelted in a zinc oxide furnace, and then reduced, oxidized and cooled to obtain zinc oxide products.

2.Zinc carbonate calcination method:
Calcine zinc carbonate at high temperature to decompose and generate zinc oxide and carbon dioxide.
The reaction equation is: ZnCO3===ZnO+CO2↑.

3.Zinc hydroxide calcination method:
Calcine zinc hydroxide at high temperature to decompose and generate zinc oxide and water.
The reaction equation is: Zn(OH)2===ZnO+H2O (Note: This reaction usually requires higher temperature and longer reaction time in actual operation, and the equal sign in the reaction equation should be understood as indicating the direction of the reaction).

Hydrothermal method

Zinc ions react with hydroxides such as sodium hydroxide or ammonium hydroxide to produce zinc hydroxide precipitate.
The zinc hydroxide precipitate is then treated under high temperature and high pressure for a certain period of time to obtain zinc oxide.

Sol-gel method

React an appropriate zinc salt with ammonia or other alkaline solution to generate zinc hydroxide sol.
After appropriate treatment, zinc oxide colloid is obtained.
Finally, the zinc oxide colloid is dried and calcined to obtain zinc oxide powder.

Sol-gel method

React an appropriate zinc salt with ammonia or other alkaline solution to generate zinc hydroxide sol.
After appropriate treatment, zinc oxide colloid is obtained.
Finally, the zinc oxide colloid is dried and calcined to obtain zinc oxide powder.

Indirect method (also known as French method)

The zinc ingot obtained by electrolysis is placed in a high-temperature crucible, heated to 600-700℃ to melt, and then evaporated at a temperature above 1000℃ to form zinc vapor.
The zinc vapor is oxidized by oxygen in the air to produce zinc oxide, accompanied by a decrease in temperature.
The zinc oxide particles are collected in a dust collection chamber through a cooling conveying pipe, and the fine particles are captured in a bag after cyclone separation to obtain the finished zinc oxide.

Wet method

Zinc ash is reacted with sulfuric acid to produce zinc sulfate.
Zinc sulfate is reacted with sodium carbonate and ammonia water respectively to obtain zinc carbonate and zinc hydroxide as raw materials.
When zinc carbonate is used as the raw material, zinc oxide is obtained by washing, drying, calcining and crushing.
When zinc hydroxide is used as the raw material, zinc oxide is obtained by washing, precipitation, drying, calcining, cooling and crushing.