Karami treatment method of Nedo furnace in copper smelting

摘要

PROBLEM TO BE SOLVED: To process slag generated in a copper refinery step having a composition of, by mass, 2-10% Cu, 35-50% Fe, 20-40% Fe₃O₄ and 18-30% SiO₂ and a grain size of 0.5-50 mmϕ into particulates each having a grain size of 0.1-5.0 mm and a moisture content of 0.5-3% which can be easily stored, transported and used, through a process having a lower copper recovery cost compared to that required in a current mineral dressing method.;SOLUTION: The slag generated in a copper refinery step in copper refining is solidified and crushed to achieve a grain size of 0.5-50 mmϕ and sprayed onto the surface of copper melt-refining furnace slag in a molten state at 1,200-1,350°C comprising 35-45% Fe, 3-15% Fe₃SO₄, 28-35% SiO₂ and 0.5-3% Cu simultaneously with 5-25 wt.%, based on the weight of the slag, pig iron particle having a composition of ≥60 mass% Fe and 2-5 mass% C and a grain size of 0.1-50 mmϕ to melt and reduce the slag in the copper refinery step and recover copper.;COPYRIGHT: (C)2004,JPO