DEZINCIFICATION SYSTEM FOR AQUEOUS NICKEL SULFATE SOLUTIONS, AND METHOD FOR SAME

WIPO Patent Application WO/2019/102652

A1

Provided is a dezincification system for aqueous nickel sulfate solutions, which is capable of stably maintaining the zinc content in a nickel/cobalt mixed sulfide low. This dezincification system for aqueous nickel sulfate solutions is provided with: a reaction container (50) in which an aqueous nickel sulfate solution containing cobalt and zinc is retained; a hydrogen sulfide supply means (40) which supplies a H2S gas to the reaction container; a zinc concentration sensing means (10) and a nickel concentration sensing means (20), which respectively sense the zinc concentration (Z) and the nickel concentration (N) in the aqueous nickel sulfate solution; and a control unit (90) which causes the hydrogen sulfide supply means (40) to adjust the amount (P) of the H2S gas to be supplied to the reaction container. The control unit (90) is also provided with a management index calculation means (91), which calculates the ratio of the zinc concentration (Z) to the nickel concentration (N) in the aqueous nickel sulfate solution as a management index (W = Z/N), and controls so that the management index (W) calculated by the management index calculation means (91) is maintained between management reference values (Q1 ≤ W ≤ Q2).

SAITO DAISUKE (JP)
OISHI TAKAO (JP)
TANAKA MASAHIRO (JP)
KITAZAKI TORU (JP)

PCT/JP2018/029091

May 31, 2019

August 02, 2018

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SUMITOMO METAL MINING CO (JP)

C22B3/08; C22B23/00; C22B3/44

JP2013185179A	2013-09-19
JP2002121624A	2002-04-26
JP2003313617A	2003-11-06
JP2013185178A	2013-09-19
JP2017226237A	2017-12-28
JP2013185178A	2013-09-19

See also references of EP 3715487A4

KOIKE Akira et al. (JP)

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