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Patent Searching and Data


Title:
METHOD FOR PRODUCING Ni/Co SULFIDE AND SYSTEM FOR STABILIZING IRON GRADE
Document Type and Number:
WIPO Patent Application WO/2019/172392
Kind Code:
A1
Abstract:
Provided is a method for increasing Ni yield of a sulfide product and lowering iron grade F. This method comprises: step (S10) for subjecting a Ni/Co-containing aqueous sulfuric acid solution (1) to a sulfurization reaction with H2S gas (2); step (S20) for recovering Ni/Co in the state of sulfide; step (S30) for recovering the H2S gas (2) as an aqueous NaHS solution (5); and step (S40) for adding the aqueous NaHS solution (5) to the aqueous sulfuric acid solution (1). The sulfurization reaction step (S10) further comprises: first reaction step (S11) for subjecting the aqueous sulfuric acid solution (1) to the sulfurization reaction with the H2S gas (2); and second reaction step (S12) for subjecting the aqueous sulfuric acid solution (1) to a sulfurization reaction with the aqueous NaHS solution (5). In step (S40) for controlling the addition amount of the aqueous NaHS solution, the management index (W), which is defined as W=X/Y, satisfy the requirement: W ≤ 0.15 vol% [wherein X represents the addition flow rate of the aqueous NaHS solution (5) and Y represents the flow rate of the aqueous sulfuric acid solution (1) supplied in second reaction step (S12)].

Inventors:
SUZUKI YUKINORI (JP)
SAITO DAISUKE (JP)
OISHI TAKAO (JP)
Application Number:
JP2019/009171
Publication Date:
September 12, 2019
Filing Date:
March 07, 2019
Export Citation:
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Assignee:
SUMITOMO METAL MINING CO (JP)
International Classes:
C01G53/00; C22B3/08; C22B3/44; C22B23/00
Foreign References:
JP2017141499A2017-08-17
JP2016194124A2016-11-17
JP2018141179A2018-09-13
Attorney, Agent or Firm:
KOIKE Akira et al. (JP)
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