At present, the comprehensive recovery of copper resources in tailings mostly adopts combined heavy floatation, single floatation, hydrometallurgy and other technical measures. Xie Jianhong and others conducted a study on the utilization of flotation tailings from a copper mine in Shaanxi. Under the condition that the content of valuable copper and sulfur in the copper tailings is low (0.18% and 2.76% respectively), the copper tailings through the spiral chute can discard the pre-selected tailings with a yield of 85.53%; After grinding, the ore is subjected to copper-sulfur sequential flotation, and the copper grade is 15.86%, the recovery rate of the pre-concentrate is 83.24%, and the sulfur grade is 41.68%, and the recovery rate of the pre-concentrate is 85.96%. Of sulfur concentrate.
A magnetic separation iron tailings in Anhui contain 0.28% copper, and the secondary copper content is relatively high. The chalcopyrite is unevenly embedded in thickness and some copper minerals are wrapped by pyrite. Ye Xuejun and others added a rapid copper float process before the original copper-sulfur mixed float-copper-sulfur separation process, and adopted the semi-priority float copper-copper-sulfur mixed float-mixed regrind-steel-sulfur separation process to obtain a copper grade of 21.48%, Copper concentrate with a copper recovery rate of 82.85% and a sulfur concentrate with a sulfur grade of 48.34% and a sulfur recovery rate of 84.43%. The copper recovery rate of this process is more than 10% higher than that of the original process.
Dexing Copper Mine is one of the world-class large-scale low-grade porphyry copper mines. The dump site adds 100,000 tons of low-grade waste below 0.2% every day. The waste rock produces copper-containing acid wastewater under the action of bacteria and rain. Although the heap leaching plant of Xinggang Mine uses the extraction-electrowinning process to produce cathode copper from copper-containing acidic wastewater. However, due to technical reasons, there are still some copper in low-concentration copper-containing acidic wastewater that cannot be recycled and can only enter the wastewater treatment system, and the resources cannot be fully recycled. To this end, Dexing Copper Mine applied the "chemical sulfide technology" process to recover copper from copper-containing acid water and built a copper-containing acid water treatment system, so that the copper recovery rate in copper acid wastewater reached 93.5%, and the annual recovery of copper metal was 1,200 tons. Comprehensive utilization of 10.3 million tons of acid wastewater.
Due to long-term storage of old tailings, many minerals have deteriorated floatability due to oxidation and other reasons, making it difficult for comprehensive resource recycling. The occurrence of copper in an old tailings is very complicated. Among them, 26.67% of the copper exists in the form of free copper oxide such as malachite, and 31.11% of the copper exists in the form of adsorbed copper or combined copper oxide, which is currently difficult to recover, and copper minerals The inlaid cloth has a fine particle size, which is produced in the form of lean conjoined organisms or in the form of fine monomers, and the mineral sample has a large mud content. In view of the characteristics of the ore, Chen Jinzhong adopted 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, Copper concentrate with 82.72g/t silver, 51.22% copper recovery rate, 54.72% gold recovery rate and 23.87% silver recovery rate. The tailings in an old tailings pond in Guizhou contain 0.31% copper, and the -0.074mm size in the tailings accounts for 40.17%. The symbiosis relationship between chalcopyrite, pyrite and pyrrhotite is close, showing fine and uneven fine grains Inlaid with gold and silver. Liu Bao et al. used the first roughing, second beneficiation, and second sweeping of the old tailings when the grinding fineness of -0.074rnm accounted for 80%. After grinding to -0.043 mm particle size accounted for 85%, the secondary beneficiation and middle ore return process are carried out. The copper, gold, and silver grades are respectively 13.05%, 18.75g/t, 229.62g/t, copper, gold, The silver recovery rate is 58.70%, 56.66%, 43.72% of copper and gold concentrates.
A large amount of copper-bearing ore is stored in the waste rock yard of the Baiyin mining area in Gansu. It is a planned pile of ore rocks in the early stage of mining, about 253 million tons, with an average copper grade of 0.25%, and the amount of copper metal is as high as about 600,000 tons. The copper-bearing waste rock with a high degree of weathering was researched on the recovery of copper. The dispersant EMLT-1, which has strong dispersibility for sludge and strong selective inhibition of silicate gangue minerals, was adopted. One roughing, one sweeping, three beneficiation, and middle ore return to the process in sequence, and finally a copper concentrate containing 17.06% of copper and a recovery rate of 83.43% is obtained, realizing the effective recovery of the low-grade copper resources.
Xinjiang Ashele Copper Mine currently contains high levels of copper, gold, and silver in the tailings of zinc-sulfur separation operations. The zinc-sulfur separation tailings are re-grinded and re-selected. Only the comparison between January and July 2010 and the whole year of 2009 , The average total copper recovery rate increased by 0.89%, of which the total copper recovery rate increased by 2.65% in the highest month, an average of 62.17 tons of copper metal was recovered per month, and the monthly economic benefit was 1.351 million yuan.
Post time: Nov-28-2020