Laterite Nickel Rotary Kiln Production Line

Nickel Ore Smelting

nickel ore smelting

Ferronickel production process flow diagram
nickel ore smelting

Large roasting restore the rotary kiln is one of the key equipment in the entire laterite nickel ore smelting process, the ore is dried into the rotary kiln, rotary kiln heated to 800 ℃, the removal of ore surface water and water of crystallization, and partial reduction of the oreiron, nickel and cobalt oxide, into the electric furnace smelting.

Compared to the rotary kiln technology and blast furnace or electric furnace process technology has the following advantages:
(1)The main energy of the smelting coal, instead of expensive coke or electricity.
(2) Freedom of choice of raw materials available in Southeast Asia, a variety of nickel laterite.
(3) Produced high quality and high-nickel-nickel-iron (containing Ni20%)can be directly used as the raw materials of stainless steel.
(4) It can be used as a coolant when the molten steel smelting.
Process: raw materials field - screening, crushing and mixing mixing ingredients - kiln - submerged arc furnace - the iron package desulfurization - refining converter - cast.

Technology and equipment: 5 * 100m rotary kiln, 63MVA closed submerged arc furnace, 40T bottom blown refining converter, granulation and cast block device.

Smelting methods and processes are as follows:
The pre-processing step the raw lateritic nickel ore pulverized, mixed with the carbonaceous material and flux limestone, and then to continuous into the rotary kiln. In rotary kilns, materials and coal combustion generated by the countercurrent movement of hot air, to withstand all the smelting step - drying, dehydration, restore growth and metal. The metal is generated in the semi-molten condition in the kiln. Firing frit of the material will be broken water, finely ground after re-election and the separator will be reduced to the nickel-iron alloy from the exhaust frit separated out from the rotary kiln. Separated from the nickel-iron was 2 to 3 mm diameter sand-like particles, and entrained 1-2% slag, the chemical composition of C0.1%, 22% Ni18, S0.45%, P0.015%. This product regardless of sulfur content tall in the steelmaking process, and have a good desulfurization capacity due to steel-making. Sand-like particles in the steel making process is very conducive to continuous feeding and as a coolant material quickly dissolved.