Method for selectively recovering lead, zinc and calcium...

Details Method for selectively recovering lead, zinc and calcium... Method for selectively recovering lead, zinc and calcium...

C - Chemistry, Metallurgy

22

B

53/258, 53/326,

C22B 3/14 (2006.01) C01F 11/18 (2006.01) C01G 9/00 (2006.01) C01G 9/02 (2006.01) C01G 21/14 (2006.01) C22B 13/00 (2006.01) C22B 19/20 (2006.01) C22B 26/20 (2006.01)

Patent

CA 2025161

A METHOD FOR SELECTIVELY RECOVERING LEAD ZINC AND CALCIUM FROM MATERIALS IN WHICH THEY ARE CONTAINED AS OXIDES OR SALTS NOT SOLUBLE IN WATER ABSTRACT A method for selectively recovering lead zinc and calcium from materials containing them as oxides or salts not soluble in water, which includes leaching the above mentioned materials with ammonium chloride solution at its boiling temperature, separating the insoluble solid and treating the obtained solution with carbon dioxide and ammonia to precipitate separately lead, zinc and calcium carbonates from which carbon dioxide is recovered by calcination or by leaching in acids.

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