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
A solid-melting furnace, the two sides of the furnace body of the solid-melting furnace are respectively provided with a feeding door and a discharging door; A workpiece conveyor belt that can place workpieces, a plurality of heating units are respectively arranged in the furnace along the feeding direction, and the heating units include an air guide device, a heat radiation tube and a heat circulation fan. The cover is arranged above the workpiece conveyor belt, the thermal circulation fan and the heat radiation pipe are fixed in the inner recess of the air guide device, and the two sides of the inner recess of the air guide device are provided with air inlets and are connected with the air outlet of the heat circulation fan. The hot air blown by the fan is guided by the air guide device and then all blown onto the surface of the workpiece placed on the workpiece conveyor belt. The solid melting furnace can improve the guidance of the heat flow, ensure that the workpiece is heated evenly, thereby improving the heating quality, and at the same time, it can meet the requirements of the furnace. The internal temperature difference is 1.5℃~2℃.
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