Zinc oxide is an oxide of zinc. Difficult to dissolve in water, soluble in acids and strong bases. Zinc oxide is a commonly used chemical additive, widely used in the production of plastics, silicate products, synthetic rubber, lubricants, paints and coatings, ointments, adhesives, food, batteries, flame retardants, and other products. Zinc oxide has a large bandgap and exciton binding energy, high transparency, and excellent room temperature luminescence performance. It is widely used in semiconductor products such as liquid crystal displays, thin film transistors, and light-emitting diodes. In addition, micro particle zinc oxide has also begun to play a role as a nanomaterial in related fields.

Zinc oxide manufacturers are mainly concentrated in Liaoning (Dalian), Shandong (Weifang), Hebei (Gaoyi, Xingtai), Jiangsu, Zhejiang and other places, producing mainly 99.7% zinc oxide, commonly known as 997 (99.7) zinc oxide. In recent years, nano zinc oxide has grown rapidly due to its excellent nano properties, and its application fields have become increasingly widespread.

The deep processing of zinc oxide involves modification through drying and calcination.

Calcination is a chemical process that involves modification, purification, decomposition, oxidation, and reduction. During the calcination process, the material exhibits both static and dynamic motion. The larger the specific surface area of the material, the faster the heat transfer rate, and the shorter the calcination time. Cyclone dynamic calcination is a new process equipment that mixes powdered materials with heated hot air and flows in opposite directions to form heat exchange. It achieves instantaneous calcination with a large specific surface area, ensuring sufficient heat exchange, decomposition, and improving product quality. The rotary flash dryer is developed and designed by our factory based on the summary of fluidized bed, cyclone, crushing and other technologies, absorbing advanced technologies at home and abroad and consulting relevant materials. The machine has a reasonable design, compact structure, and novelty, and is used in industries such as pigments, dyes, fine chemicals, pesticides, fertilizers, feed, pharmaceuticals, electronics, etc., achieving the goals of high efficiency, speed, energy saving, large-scale production of small equipment, and continuous operation

1. Due to the high dispersion of materials caused by centrifugation, shearing, collision, and friction, as well as the high relative velocity between gas and solid, mass and heat transfer are strengthened, resulting in high production intensity of the machine.
2. The dry gas enters the bottom of the drying chamber, generating a strong rotating airflow that has a strong flushing effect on the materials on the wall, eliminating wall sticking.
3. In the high-temperature zone at the bottom of the dryer, heat sensitive materials do not come into direct contact with the hot surface, solving the problem of coking and discoloration of heat sensitive materials.
4. Install swirl plates in the drying room to control the moisture content of the material to a very low level.

5. Continuous operation, temperature control, sufficient gas-solid mixing, and stable product quality.
6. Instant calcination ensures that the product is not burnt, which is beneficial for the production of active products.
7. Closed system, environment, high recycling rate, civilized production.
8. The combustion exhaust can be equipped with a system combination of a cooler and a dryer to effectively utilize thermal energy.
9. Configure exhaust gas recovery and treatment system for exhaust gas treatment and utilization
10. The temperature of the hot air inside the calcination furnace is 500-1200 ℃
11. The particle size of the calcined material is less than 60 mesh.
12. Burning fuels, solids (coal), gases (coal gas, natural gas), liquids (diesel, heavy oil).
13. Combustion methods: indirect, direct, internal and external combustion.

Operation method: Heat the zinc ingot obtained by electrolysis to * * * * * * ℃ and melt it. Place it in a high-temperature resistant calcination furnace to melt and vaporize the material at * * * * * * ℃. Introduce hot air for oxidation. The generated zinc oxide is cooled and separated by a cyclone, and fine particles are captured with a cloth bag to obtain the finished zinc oxide product.

Direct method. Reaction equation:

C+O2=CO2

CO2+C=2CO

ZnO+CO=Zn (vapor)+CO2

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

Operation method: Mix roasted zinc ore powder (or zinc containing material) with anthracite (or coke) and limestone in a ratio of 1:0.5:0.05 to form balls. After reduction smelting at 1300 ℃, zinc oxide in the mineral powder is reduced to zinc vapor, which is then oxidized by air. The generated zinc oxide is captured to produce finished zinc oxide products.

Widely used in industries such as chemical, building materials, and mining, the following are typical examples

Chemical industry
Magnesium oxide, zinc, iron, lithium, nickel, aluminum, cobalt and other hydroxides, rare earth oxides, barite, cryolite, aluminum fluoride, vanadium pentoxide, manganese sulfate, soda ash, etc
Building Materials Mining
Boron magnesium ore, hemihydrate gypsum, kaolin, brucite, calcium carbonate, molybdenum trioxide, fluorite powder, magnesite, etc

Our company can provide different specifications of furnace types, design and production, and on-site installation. Special matching designs can be provided for special calcination process furnace types.