Extraction of valuable metals from low-grade nickeliferous laterite ore by reduction roasting-ammonia leaching method |
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Authors: | Sheng-li Chen Xue-yi Guo Wen-tang Shi and Dong Li |
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Affiliation: | [1]School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China [2]Jinchuan Nonferrous Metals Company, Jinchang 737100, China |
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Abstract: | 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. |
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Keywords: | low-grade nickeliferous laterite ore nickel cobalt reduction roasting ammonia leaching extraction |
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