Copper tailings recovery of pyrite example (Wushan Copper Mine)

Copper-containing metal ore WUSHAN pyrite type sulfur deposits, ore average sulfur content of more than 25%, the current beneficiation process plant is enriched with secondary transition zone to a native ore. The copper-bearing minerals in the ore are mainly secondary copper sulfide minerals such as Lanhui copper or chalcopyrite (about 55% to 60%). These secondary copper minerals are prone to over-grinding and oxidation to produce copper ions, which strongly activate pyrite. Although washed, the removal rate of copper ions is generally only about 50%. The rest of the ore and slurry after washing into the grinding operation will bring great difficulties to the separation of copper and sulfur, directly affecting the ore dressing index. In the original design and production, the principle flow of sulfur-inhibiting copper is adopted. In order to suppress the pyrite which is activated by copper ions, the concentrate grade of the preferential floating copper is ensured. 15kg/t of lime is added during the grinding process, and the copper is thick. Select pU up to 12, under the action of strong alkali and high calcium, pyrite is strongly inhibited (the copper mineral with poor floatability is also affected to varying degrees), and the agitation efficiency of the A-type flotation machine is not high. The coarser grade is difficult to choose and is lost in the tailings. Therefore, the copper and sulfur selection indexes are not high, and the flotation tailings still contain 22% to 26% of sulfur.

According to the actual situation, through the small test, equipment selection, industrial test and production practice, the plant uses the re-election process to recover the pyrite in the flotation tailings. The production process is: the last tank selection sulfur flotation from the production. The slurry is extracted from the machine, and the sawdust buckle is removed. The No. 3 Warman pump is pumped to the fixed or slurry distributor, and then the rotary slurry distributor uniformly feeds 20 spiral concentrators. The tailings are re-elected into the tailings sampling and conveying system; the sulfur concentrate is pumped into the sulfur concentrate sampling and dewatering system of the main production system by the No. 2 rubber pump, and the medium mine returns to the No. 3 Warman pump. The re-selection of sulfur recovery project was officially put into operation in June 1989. Each year, 1.6 to 17,000 tons of sulfur concentrate can be recovered from the beneficiation tailings, so that the total recovery rate of sulfur can be increased by 6.23% to 12.24%, and the actual net profit and tax of 60.38 per year. 105.03 million yuan.