Abstract
The acid-leaching tailings of laterite nickel ore is a typical hazardous waste in the laterite nickel ore industry. The current treatment involves stacking and landfills, which leads to considerable environmental pollution and resource wastage. The reduction of hazardous waste and the recovery of iron resources have environmental and economic value. In this study, a mineral phase transformation technology was proposed. The suitable transformation conditions were 700 ℃, 30 min, and 30 % CO, and optimal grinding and magnetic conditions were −37 μm content 92.42 % and 143.35 kA·m−1, respectively. Then the iron grade and recovery reached 52.00 % and 80.11 %, respectively. Meanwhile, hematite has converted into strongly magnetic magnetite with saturation magnetization increased from nearly 0 A·m2·kg−1 to 28.49 A·m2·kg−1. And particles transformed from dense to a porous honeycomb structure. Therefore, the mineral phase transformation achieves recovering iron resources during reducing hazardous waste. It proposed a new way of resource utilization of laterite nickel ore acid-leaching tailings which has positive environmental and resource benefits.
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