Flue Gas Treatment In Rotary Kilns For Smelting Ferro-nickel In Mineral Hot Furnaces (RKEF)

At present, the contradiction between industrial production and environmental pollution is becoming more and more prominent, and smelting industry has become one of the main sources of pollution. In order to improve people’s living environment, the smelting industry needs to treat pollutants in the production process, including the recycling and harmless treatment of wastewater, waste gas and solid waste, in order to comply with the requirements of sustainable development, which is “to have mountains of gold as well as mountains of green water”.

Rotary Kiln – Mineral Heat Furnace (RKEF) Smelting Process of Ferro Nickel

Rotary Kiln – Mineral Heat Furnace (RKEF) Smelting process can be divided into: raw material field → screening, crushing and mixing batching → drying kiln → rotary kiln → mineral hot furnace → iron ladle desulfurization → refining (AOD, LF furnace) → continuous casting → hot rolling → annealing and pickling → cold rolling these steps.

First of all, the raw material nickel laterite ore through crushing, screening, mixing and other pretreatment. Then the mixture (ore + reduced coal + flux) into the rotary kiln, after drying (remove free water), preheating (300 ~ 750 ℃), roasting pre-reduction (1000 ℃), part of the NiO, Fe ₂ O ₃ is reduced, the output of high-temperature roasted sand (~ 900 ℃), directly hot loaded into the mine heat furnace. The high temperature roasted sand is deeply reduced in the mineral heat furnace, and finally nickel-iron alloy and slag are generated. The slag can be used for building materials after water quenching, and the gas can be recycled after purification. Crude ferronickel is desulphurized (iron ladle) and then converter refined (Si, P, C removed), and finally ingot casting/granulation can complete the whole process.