Production of zinc oxide from complex sulfide concentrates using chloride processing
First Claim
1. A process for recovering (i) zinc oxide, (ii) iron, and (iii) at least one of copper, silver, cadmium, cobalt and lead from a material that includes zinc, iron, and at least one of copper, silver, cadmium, cobalt and lead, comprising the steps of:
- leaching the material with hydrochloric acid and oxygen to produce a leach solution;
precipitating iron from the leach solution with magnesium oxide;
recovering at least one of copper, silver, cadmium, cobalt and lead from the leach solution by cementation with zinc dust; and
precipitating zinc oxide from the leach solution with magnesium oxide.
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Abstract
The present invention relates to an apparatus and a process for producing zinc oxide from a zinc-bearing material. The process according to the present invention comprises the steps of leaching the complex sulfide material with hydrochloric acid and oxygen; precipitating iron from the leach solution using magnesium oxide and oxygen; removing copper, silver, cadmium, cobalt and lead from the leach solution by cementation with zinc dust; precipitating zinc oxide from the leach solution using magnesium oxide; and spray roasting the remaining magnesium chloride leach solution to regenerate hydrochloric acid and magnesium oxide. The present invention further relates to processes for recovering copper, silver, lead, and iron from complex sulfide materials.
57 Citations
37 Claims
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1. A process for recovering (i) zinc oxide, (ii) iron, and (iii) at least one of copper, silver, cadmium, cobalt and lead from a material that includes zinc, iron, and at least one of copper, silver, cadmium, cobalt and lead, comprising the steps of:
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leaching the material with hydrochloric acid and oxygen to produce a leach solution;
precipitating iron from the leach solution with magnesium oxide;
recovering at least one of copper, silver, cadmium, cobalt and lead from the leach solution by cementation with zinc dust; and
precipitating zinc oxide from the leach solution with magnesium oxide. - View Dependent Claims (2, 3)
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4. A process for producing zinc oxide from a material which contains (i) zinc, (ii) iron, and (iii) at least one of copper, silver, cadmium, cobalt and lead, the process comprising the steps of:
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leaching the material with hydrochloric acid and oxygen to produce a leach solution;
precipitating iron from the leach solution with magnesium oxide;
recovering at least one of copper, silver, cadmium, cobalt and lead from the leach solution by cementation with zinc dust;
precipitating zinc oxide from the leach solution with magnesium oxide; and
spray roasting a magnesium chloride solution remaining after precipitating zinc oxide to regenerate hydrochloric acid and magnesium oxide. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification