Shelter Canada • Gordon (Sherritt Gordon) in 1954 successfully used in pressurized ammonia leaching of nickel pyrite leaching, but also had a lot of acid leaching studies. They studied a hybrid pentlandite - Yellow copper ore - pyrrhotite leach ingredient: Ni 10%, Cu5%, Fe 30%, S 30%. When the temperature is 210 ° C and the partial pressure of oxygen is 700 kPa, the leaching rate of nickel and copper can reach 99% ^[1] .
1990s, Keming Ke (Cominco) Engineering Services ^[2], Pellet • Joseph Dong (Placer Dome), General Gold Resources Inc. (General Gold Resources) and other tests over temperature chalcopyrite leaching process. For example, the leaching of porphyry copper ore, chalcopyrite, chalcopyrite-bronite ore (including Cu 41.4%, Fe 22.2%, S 28.0%), etc., at 200-210 ° C, 2 MPa oxygen Under the pressure of 60 min, the copper leaching rate is about 99%. The leachate contains 36-78 g/L of copper, 40-31 g/L of sulfuric acid, and less than lg/L of iron.
references:
1.Berezowsky R, Trytten L, ALTA Copper—7 Technical Proceedings, 23 May 2002, Perth, Australia
2. Jones DL, US Patent 5316567, May 31 1994

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