Nickel recovery process

Details Nickel recovery process Nickel recovery process

C - Chemistry, Metallurgy

22

B

C22B 3/02 (2006.01) B01D 21/00 (2006.01) B01J 23/94 (2006.01) B01J 25/04 (2006.01) B01J 45/00 (2006.01) C02F 1/70 (2006.01) C02F 9/00 (2006.01) C22B 3/42 (2006.01)

Patent

CA 2051016

Abstract The invention relates to a process for recovering nickel from industrial effluents, characterised in that a) the effluent loaded with nickel is allowed to settle in a corrugated-plate separator (1) for the removal of solid constituents contained therein, b) a flocculant is added and the mixture is neutralised with alkali or mineral acid, c) after flocculation, the mixture is again allowed to settle in a corrugated-plate separator (3) and d) filtered through a sand filter (4), e) the filtered effluent is passed through a sequester ing cation exchanger system consisting of three exchanger columns, the first column (5) being loaded up to breakthrough of nickel, the second column (6) serving as a guard filter and the third column (7) being regenerated or standing by in the freshly regenerated state, f) the particular column loaded with nickel is re- generated with dilute mineral acid, and g) the regenerate is treated with sodium hypophosphite in the presence of catalytic quantities of sodium borohydride, and to equipment for carrying out this process.

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