APPARATUS AND METHOD FOR REMOVING FREE ACID, AND METHOD FOR PRODUCING NICKEL-AND-COBALT-MIXED SULFIDE

Japanese Patent JP2016222989

A

PROBLEM TO BE SOLVED: To provide a method capable of promoting precipitation of iron contained in leach slurry and limiting increases in turbidity of the overflow liquid obtained in solid-liquid separation of the leach slurry, in preliminary neutralization of the leach slurry generated in a hydrometallurgical process for nickel oxide ore.SOLUTION: This invention relates to a method for removing a free acid, the method performing neutralization by adding a neutralizing agent to leach slurry obtained by high pressure acid leaching of nickel oxide ore and removing the free acid contained in the leach slurry, wherein the method uses at least two reaction tanks, adds the neutralizing agent divided between the two or more reaction tanks in multiple stages, and performs neutralization of the leach slurry continuously.SELECTED DRAWING: Figure 1

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AIDA SACHIHIRO
OISHI TAKAO

JP2015112147A

December 28, 2016

June 02, 2015

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SUMITOMO METAL MINING CO

C22B23/00; C22B3/44

Masayuki Masabayashi
Hayashi Ichiyoshi

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