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Re-election example of foreign copper alloy tailings
The copper tailings are re-elected extensively in foreign countries. In Michigan, the United States will re-grind and flotation (or ammonia leaching) of copper tailings, processing 82 million tons, and producing 338,000 tons of copper. The United States also adopts a process similar to carbon extraction to extract gold , which is impregnated with extraction. The carbon particles of the agent are added to the copper tailings slurry to recover copper. The key is that the extractant is cheap. The Russian-based Al Marek plant will grind the tailings to -74μm for about 50% flotation, and 80% of the copper in the tailings can be recycled. The Kazakh Barhash selection plant was floated and reground; the selected process recovered copper and molybdenum from the tailings of the poor copper mine.
At present, the recovery of copper from copper tailings by leaching method has been very successful. It is generally believed that the use of sulfuric acid leaching copper tailings construction plant has less investment, short time, less pollution, and can be used as a by-product of metallurgical enterprises. It is more economical when the quantity is large. The Molunxi Copper Plant in Arizona, USA, uses sulfuric acid to treat copper oxide tailings. The copper recovery rate is 73.8%, with an annual output of 50,000 tons of cathode copper, accounting for 13% of the plant's copper production. Chile's Chuquikama uses large leaching tank sulfuric acid leaching-electrolysis to recover 900,000 tons of copper from a large number of old tailings that have been stored for many years at a rate of 52,500 tons of copper per year. Russia and Spain have also achieved good results in recovering copper from tailings using a bacterial leaching process.
Foreign countries also choose copper tailings to recover other components than copper. For example, in India, the tailings of flotation copper are firstly re-selected with a shaker, and then the uranium is recovered by wet method. The South African company Fosk Company uses flotation and re-selection to obtain 36.6% of P 2 O 5 from the copper tailings. 65.6% of the phosphate concentrate; Japan pure gold and copper, tungsten, bismuth and then recovered from selected from copper Residue.