发明名称 |
METHOD OF RECOVERING COPPER AND PRECIOUS METALS |
摘要 |
Provided is a method of recovering copper and one or more precious metals comprising leaching copper-bearing ore and/or concentrate under atmospheric or slightly pressurized conditions at a temperature below the boiling point of the leach solution in a sulfuric acidic solution in the presence of one or more alkali metal or alkali earth metal halides, whereby the total halide concentration is from 30 to 115 g/L, to dissolve copper and to obtain a leaching liquor comprising copper, sulfur species, and halides in solution. The leaching liquor is then subjected to a solid-liquid separation after which a first aqueous pregnant leach solution and a copper depleted leaching residue are obtained. Copper is purified by solvent extraction from the first aqueous pregnant leach solution to obtain a first copper-containing loaded organic solution and a first aqueous raffinate. The copper containing loaded organic solution is stripped and copper is recovered. |
申请公布号 |
US2016115568(A1) |
申请公布日期 |
2016.04.28 |
申请号 |
US201414895740 |
申请日期 |
2014.06.06 |
申请人 |
OUTOTEC (FINLAND) OY |
发明人 |
VALKAMA Kari;SINISALO Pia;KARONEN Janne;HIETALA Kari |
分类号 |
C22B15/00;C22B3/08;C25C1/20;C22B3/46;C22B3/44;C25C1/12;C22B3/00;C22B3/22 |
主分类号 |
C22B15/00 |
代理机构 |
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代理人 |
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主权项 |
1. A method of recovering copper from copper-bearing sulfide ore and/or concentrate comprising the steps of:
(a) leaching copper-bearing ore and/or concentrate under atmospheric or elevated pressure up to 300 kPa at a temperature below the boiling point of the leach solution in a sulfuric acid solution in the presence of one or more alkali metal or alkali earth metal halides, whereby the total halide concentration is from 30 to 115 g/L, to dissolve copper and to obtain a leaching liquor comprising copper, sulfur species, and halides in solution; (b) solid-liquid separating the leaching liquor to obtain a first aqueous pregnant leach solution and a copper depleted leaching residue; (c) extracting copper by solvent extraction from the first aqueous pregnant leach solution to obtain a first copper-containing loaded organic solution and a first aqueous raffinate; subjecting a bleed stream of the first aqueous raffinate to a copper hydroxychloride precipitation step; and after solid-liquid separation precipitating impurities from the copper-depleted solution; (d) stripping copper from the first copper containing loaded organic solution with an electrolyte solution to obtain a copper-depleted organic solution and a copper-containing electrolyte solution; and (e) recovering copper from the copper containing electrolyte solution. |
地址 |
Espoo FI |