Red Soil Nickel Ore Rotary Kiln
2025-08-30
1. Working Principle
The principle of laterite nickel ore rotary kiln calcination mainly involves reducing nickel oxide in the ore to metallic nickel through high-temperature reduction reactions, while removing impurity elements. Process flow As follows:
Raw Material Pretreatment
Laterite nickel ore needs to be crushed and ground to 50 ~ 150mm particle size, and mixed evenly with auxiliary materials such as limestone and anthracite.
Drying and Preheating
The material first enters the low-temperature zone of the rotary kiln (about 100℃ ), removing free water and crystalline water; then the temperature rises to 800℃ approximately, further removing crystalline water and undergoing slight oxidation-reduction reactions.
High-Temperature Roasting and Reduction
When the temperature rises to 900℃ , reducing agents such as anthracite burn to produce heat and reducing gases (such as CO ), which react with nickel oxide in the ore ( NiO ):
NiO + C → Ni + CO
At the same time, CaO produced by limestone decomposition CaO adjusts the atmosphere inside the furnace to promote the reduction reaction.
Metal Aggregation and Melting
As the temperature rises above 1000℃ metal particles aggregate to form sponge-like slag nickel-iron, which is finally discharged in a molten state.
2. Burner Selection
- Gas Burners
Fuels: natural gas, liquefied petroleum gas, blast furnace gas, coke oven gas, light hydrocarbon gas, and other chemical tail gases;
- Oil Burners
Fuels: diesel, methanol, heavy oil, alcohol-based fuels, etc.
- Pulverized Coal Burners
Fuel: pulverized coal
Currently, natural gas burners are mostly used.
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Address: No. 118, Fengqing Road, Jinshui District, Zhengzhou City
Tel:+86-371-60960056
Mobile:+8613849187223
Email:zhongweigongyelu@126.com
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