Comprehensive recovery of copper in tailings

At present, the overall recovery of copper tailings resources to use more heavy floating joint, single flotation, hydrometallurgical and other technical measures. Xie Jianhong et al. conducted a re-selection resource utilization study on a copper mine flotation tailings in Shaanxi. Under the condition that the price of copper and sulfur in the copper tailings is low (0.18% and 2.76% respectively), the copper tailings can be discarded by the spiral chute to pre-select the tailings with a yield of 85.53%; After the ore grinding, the copper and sulfur are sequentially floated, and the copper grade is 15.86%, the copper concentrate with the pre-selected concentrate recovery rate of 83.24%, and the sulfur grade is 41.68%, and the recovery rate of the pre-selected concentrate is 85.96%. Sulfur concentrate.

A magnetic separation iron tailings in Anhui contains 0.28% copper, and the secondary copper content is high. The chalcopyrite is unevenly embedded in thickness and some copper minerals are wrapped by pyrite. Ye Xuejun and others added a fast float copper process before the original copper-sulfur mixed-copper-sulfur separation process, using a semi-priority floating copper-copper-sulfur mixed float-mixed regrind-steel-sulfur separation process to obtain a copper grade of 21.48%. The copper concentrate with a copper recovery rate of 82.85%, a sulfur concentrate with a sulfur grade of 48.34% and a sulfur recovery rate of 84.43%, the copper recovery rate of the process is increased by more than 10% compared with the original process.

Dexing Copper Mine is one of the world-class large-scale low-grade porphyry copper mines. The dump site increases the low-grade 0.2% waste rock by 100,000 tons per day. The waste rock produces acidic wastewater containing copper under the action of bacteria and rainwater. Although the Xingsteel heap leaching plant uses the extraction-electrowinning process to produce cathode copper from copper-containing acidic wastewater. However, due to technical reasons, some of the copper in the low-concentration copper-containing acidic wastewater can not be recycled, and can only enter the wastewater treatment system, and the resources cannot be completely recycled. To this end, Dexing Copper Mine uses the "chemical vulcanization technology" to recover copper from copper-containing acidic water, and builds a copper-containing acidic water treatment system, so that the copper recovery rate in copper acid wastewater reaches 93.5%, and the annual recovery of copper metal is 1200t. Comprehensive utilization of acid waste water 10.3 million tons.

Due to the long-term accumulation of old tailings, many minerals are degraded due to oxidation and other reasons, and it is difficult to comprehensively recycle and utilize resources. The occurrence of copper in an old tailings is very complicated. Among them, 26.67% of copper exists in the form of free copper oxide such as malachite, and 31.11% of copper exists in the form of adsorbed copper or copper oxide which is difficult to recover at present, and copper minerals. The size of the inlay is fine, and it is produced in the form of lean continuous biomass or in the form of fine monomer. The mineral sample contains a large amount of mud. In view of the nature of the ore, Chen Jinzhong used surface treatment and activation and high-efficiency collector flotation technology to strengthen the surface (semi)oxidized copper sulfide flotation. The closed circuit test obtained copper grade 12.02%, gold content 9.02g/t, A copper concentrate containing 82.72 g/t of silver , a copper recovery of 51.22%, a gold recovery of 54.72%, and a silver recovery of 23.87%. The tailings in an old tailings pond in Guizhou contain 0.31% copper, and the tailings -0.074mm grain size accounts for 40.17%. The chalcopyrite has close symbiotic relationship with pyrite and pyrrhotite, showing fine and fine grain unevenness. Embedding, accompanied by gold and silver. Liu Bao et al. used the old tailings in the case of grinding fineness of -0.074rnm, which accounted for 80% of the grain size, using a rough selection, secondary selection, secondary sweeping, and two selected concentrates. After grinding to -0.043 mm, the grain size is 85%, and then the secondary selection and medium-mineral sequence return process are obtained. The copper, gold and silver grades are 13.05%, 18.75g/t and 229.62g/t respectively, copper, gold, The silver recovery rates were 58.70%, 56.66%, and 43.72% copper-gold concentrates, respectively.

There are a large number of copper-bearing ore deposits in the waste rock yard of Gansu Baiyin Mining Area. It is a planned ore-bearing rock in the early stage of mining, about 253 million tons, with an average copper grade of 0.25% and a copper metal volume of about 600,000 tons. The copper beneficiation and recovery of the copper-bearing waste rock with high degree of weathering was studied. The dispersing agent EMLT-1 with strong dispersibility of the slime and strong selective inhibition of silicate gangue minerals was adopted. A rough selection, a sweep selection, three selections, and a medium-mine sequence return process, and finally obtain a copper concentrate containing 17.06% copper and a recovery rate of 83.43%, thereby realizing effective recovery of the low-grade copper ore resources.

Xinjiang Ashele copper mine currently contains copper, gold and silver in the tailings of zinc- sulfur separation operation. The zinc-sulfur separation tailings are re-selected by copper re-grinding, only in comparison with the whole year of January to July 2010. The average copper recovery rate increased by 0.89%, of which the highest total copper recovery rate was 2.65%, and the average monthly recovery of copper metal was 62.17t, and the monthly economic benefit was 1.351 million yuan.

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