公开(公告)号：US20230046474A1

公开(公告)日：2023-02-16

申请号：US17979502

申请日：2022-11-02

Applicant: HATCH LTD.

Inventor： Robert John Fraser ,  Andrew Doolittle ,  Alexander Sutherland ,  Adam Best ,  Firsya Risandi

IPC: C01G53/10

Abstract: A process for removing impurities from a crystallized metal sulfate, including contacting crystallized metal sulfate with a liquor rich in metal sulfate. The metal may be cobalt, nickel, or manganese, and the impurities may be magnesium or calcium. The liquor rich in metal sulfate may be an overflow liquor from crystallization of the metal sulfate, and said overflow liquor may be subject to one or more impurities removal steps prior to contacting the crystallized metal sulfate, such that the overflow liquor contains lower levels of impurities than the crystallized metal sulfate to be contacted. A counter-current wash circuit may be used to remove impurities from a crystallized metal sulfate, whereby a plurality of washing tanks are configured to receive crystallized metal sulfate in a sequence, and washing liquor in reverse of said sequence.