Method for efficiently recovering ferronickel alloy from stainless steel sludge
A nickel-iron alloy and stainless steel technology is applied in the field of efficient recovery of nickel-iron alloys in stainless steel sludge, which can solve the problems of low nickel and iron recovery rate, singleness, and inability to recover heavy metals, and achieves the effect of being beneficial to reduction and recovery.
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[0025] A method for efficiently reclaiming ferronickel in stainless steel sludge, comprising the following steps:
[0026] (1) Mix stainless steel sludge with laterite nickel ore to make mixture A, and the mass ratio of nickel and iron in mixture A is 0.07-0.12;
[0027] (2) Mixture A is dried in a drying kiln, the temperature in the kiln is 850°C-900°C, and the drying time is 15-20min;
[0028] (3) Add a carbonaceous reducing agent and limestone to the dried mixture A to obtain a mixture B, and roast the mixed material B in a rotary kiln to obtain calcined sand; the carbonaceous reducing agent is coke The mixture of powder and blue charcoal powder, the amount of carbonaceous reducing agent is 2.5%-6% of the mixture B, and the particle size is 8-20mm; the amount of limestone is 0.5-6% of the mixture B; the kiln of the rotary kiln The internal residence time is 90-180min, and the temperature of the high temperature section in the rotary kiln is 600-1100°C;
[0029] (4) The ca...
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