| Copper iron ore had been studied from Chile. Based on the investigation of ore properties and extensive mineral processing and metallurgy, it was adopted that a flowsheet by magnetic separation-leaching-ore blending. Finally, better technical index was obtained.Analysis of ore properties indicates that the content of Cu and Fe reaches 0.58% and 62.14% respectively. In this high-grade iron ore, the content of copper is over the standard, but these elements, such as S, P, As, Pb, Zn and so on are not. Iron ore is mainly magnetite, hematite and limonite, which posses 54.80% and 42.30% respectively. Copper ore is mainly oxide ore. The higher combined copper oxide ore is 34.50%. which would bring considerable difficulties of copper separation from iron ore.On the basis of ore properties, it was conducted that copper separation from iron ores. Results indicated that single floatation and magnetic seperation are not the effective methods for treating this iron ore. Magnetic separation showed that parts of high quality concentrate was obtained, but in tailings, copper and iron ore are close symbiosis and even form isomorphic by Cu replacing Fe in magnetite. Thus, copper separation from iron ore are much more difficulty with conventionally physical methods. The key to exploitation and utilization of iron is to achieve copper separation from iron ore in tailings as much as possible. Chemical mineral processing, which takes a important part in preconcentration and separation. is possible to achieve copper separation from iron ore in tailings from low intensity magnetic seperation.For tailings, after leaching in sulfuric acid, leaching residue in which the content of Cu is 0.28% and Fe is 57.90% was obtained. Order to further reduction of the content of Cu in residue, A flowsheet was adopted by grinding-sulfuric leaching or reductive roasting-grinding-sulfuric leaching. Compared with sulfuric leaching, they were not adopted due to the complicated process and operation. Chloridizd roasting of tailings could obtained the content of Cu is 0.05% and Fe is above 59.80%, but it was also not considered as the final flowsheet due to the difficulties of equipment corrosion has been not overcome by this time. It was solved that the difficulties of final products exceeding the standard of copper content through high quality iron ore concentrate mixed with leaching residues, which is reasonable both in technique and economy.Optimal processing parameters had been obtained through research of magnetic separation conditions. On the condition of 85% below 74μm of grinding fineness and 88kA/m of magnetic field intensity, two products were obtained:one is the high quality iron ore concentrate, in which the content of Fe is 68.90%, recovery of Fe is 46.83% and the content of Cu is 0.16%; the other is tailing, in which the content of Fe is 57.42%, recovery of Fe is 53.17% and the content of Cu is 0.86%. Iron ore concentrate used as blending material and tailings used as leaching material.Best technological conditions of sulfurid acid was obtained when dosage of sulfuric acid is 140kg/t, leaching time is 60 min, ratio of liquid to solid is 3:1 and stirring rate is 300r/min. In room temperature, leaching residues in which the content of Cu is 0.28% were obtained.According to the flowsheet of magnetic separation-leaching-ore blending, two products were obtained:one is the high quality iron ore concentrate, in which the content of Fe is 64.98%, recovery of Fe is 65.88% and the content of Cu is less than 0.16%; the other is tailing, in which the content of Fe is 57.89%, recovery of Fe is 32.05% and the content of Cu is 0.28%. |
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