著者

小林 宙 庄司 浩史 浅野 聡 今村 正樹

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.80, no.11, pp.713-718, 2016 (Released:2016-10-25)

参考文献数

8

被引用文献数

1 3

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MCLE (Matte Chlorine Leach and Electro-winning) process developed by Sumitomo Metal Mining Co., LTD. is well known as a unique commercial nickel refining process with high nickel recovery ratio. Two types of nickel sulfide, nickel matte and mixed sulfide (MS: mixture sulfide of nickel and cobalt), are treated in the MCLE process, and the leaching rate difference for each materials become obvious in this process. Bench scale tests had been carried out and leaching rates and activation energies of chlorine leaching reactions were identified. The nickel leaching rate of MS in chlorine leaching reaction is 60% smaller than that of nickel matte.  The nickel leaching rate difference between nickel matte and MS in chlorine leaching reaction is derived from their reaction free energy difference. The determinants of the chlorine leaching reaction rate of nickel matte and MS are respectively a chemical reaction rate and elements diffusion ratio on their surface.

著者

平郡 伸一 庄司 浩史 西川 勲 小林 宙 井手上 敦

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.133, no.4, pp.68-75, 2017-04-01 (Released:2017-04-29)

参考文献数

19

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Owing to the continual depletion of resources, low-grade nickel laterite ores are being treated nowadays to extract Ni. High-pressure acid leaching (HPAL) is a suitable process for treating nickel laterite ores. HPAL has the advantage of having a high extraction rate and low chemical consumption associated with the neutralization of iron; the low chemical consumption is owing to the formation of hematite precipitate in the residue. By studying the behavior of iron under pressure acid leaching, it was observed that sulfur and carbon contained in the ore decreased the redox potential and lead to Fe (II) dissolution. Iron concentration in the leached solution was decreased by oxygen rich leaching.