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Nickel and cobalt were extracted from low-grade nickeliferous laterite ore using a reduction roasting-ammonia leaching method.The reduction roasting-ammonia leaching experimental tests were chiefly introduced,by which fine coal was used as a reductant.The results show that the optimum process conditions are confirmed as follows:in reduction roasting process,the mass fraction of reductant in the ore is 10%,roasting time is 120 min,roasting temperature is 1 023-1 073 K;in ammonia leaching process,the liquid-to-solid ratio is 4:1(mL/g),leaching temperature is 313 K,leaching time is 120 min,and concentration ratio of NH3 to CO2 is 90 g/L:60 g/L.Under the optimum conditions,leaching efficiencies of nickel and cobalt are 86.25% and 60.84%,respectively.Therefore,nickel and cobalt can be effectively reclaimed,and the leaching agent can be also recycled at room temperature and normal pressure.
Nickel and cobalt were extracted from low-grade nickeliferous laterite ore using a reduction roasting-ammonia leaching method. Reduction roasting-ammonia leaching experimental tests were chiefly introduced, by which fine coal was used as a reductant.The results show that the optimum process conditions are confirmed as follows: in reduction roasting process, the mass fraction of reductant in the ore is 10%, roasting time is 120 min, roasting temperature is 1 023-1 073 K; in ammonia leaching process, the liquid-to-solid leaching temperature is 313 K, leaching time is 120 min, and concentration ratio of NH3 to CO2 is 90 g / L: 60 g / L. Under the optimum conditions, leaching efficiencies of nickel and cobalt are 86.25% and 60.84% respectively. Before, nickel and cobalt can be reclaimed, and the leaching agent can also also recycled at room temperature and normal pressure.