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含Au、Ag或铂族金属等贵金属的矿石或精矿,在含至少一种金属氯化物和能氧化贵金属的试剂的酸性溶液中浸出,其温度>100℃,Cl~-浓度>8 mol/L。浸出前矿石可在750℃焙烧,或加浓硫酸和氧化剂在250℃焙烧。浸出后分离溶液,用离子交换、吸附、沉淀、电积或溶剂萃取回收金属。残渣可如上所述再焙烧、浸出。氯化物是Zn、Cd、Al、Mg、Fe~(3+)
Ores or concentrates containing precious metals such as Au, Ag or platinum group metals are leached in an acidic solution containing at least one metal chloride and a reagent capable of oxidizing a noble metal at a temperature of> 100 ° C and a Cl ~ - concentration of> 8 mol / L. The ore before leaching can be roasted at 750 ° C or concentrated sulfuric acid and the oxidizer at 250 ° C. After leaching, the solution is separated and the metal recovered by ion exchange, adsorption, precipitation, electrowinning or solvent extraction. The residue can be calcined and leached as described above. Chlorides are Zn, Cd, Al, Mg, Fe ~ (3+)