Dehalogenation of oxidic zinc-bearing materials

Details Dehalogenation of oxidic zinc-bearing materials Dehalogenation of oxidic zinc-bearing materials

C - Chemistry, Metallurgy

01

G

53/322

C01G 9/02 (2006.01) C22B 7/02 (2006.01)

Patent

CA 1200701

ABSTRACT OF THE DISCLOSURE A method for the dehalogenation of oxidized zinc-bearing materials for the extraction of a major portion of contained chloride and fluoride by leaching which comprises forming a reaction slurry of a mixture of said materials, sodium carbonate and water, said sodium carbonate being present in an amount sufficient to maintain the pH of the reaction slurry at a value above about 7, agitating the reaction slurry for a period of time in the range of about 10 minutes to 8 hours, and separating the solids fraction from the liquid fraction for the recovery of the solids fraction as a dehalogenated oxidic zinc-bearing material. The reaction slurry preferably contains oxidic zinc-bearing materials in an amount of from 15 to 25% by weight of the slurry and the leaching preferably is carried out at a pH in the range of about 8.5 to 9.0 at ambient temperatures.

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