黄铜矿
浸出(土壤学)
硫酸
硫化物
活性炭
黄铁矿
铜
化学
铜提取技术
硫黄
硫化铜
无机化学
氧化硫硫杆菌
铁
硫化物矿物
生物浸出
溶解
冶金
吸附
材料科学
矿物学
地质学
有机化学
氧化亚铁硫杆菌
土壤科学
土壤水分
作者
Ana Méndez,M. Dovale Álvarez,José Manuel Fidalgo,Joan J. Manyà,Gabriel Gascó
标识
DOI:10.1016/j.mineng.2022.107594
摘要
Chalcopyrite is the resource with the highest amount of Cu content representing around 70–80% of the known reserves in the world. However, chalcopyrite like other copper sulfides, is usually found in deposits with grades around 0.4–0.5% copper. The exploitation of these reserves using traditional flotation methods followed by pyrometallurgical treatment of copper concentrate is at the limit of economic viability. Hydrometallurgical route would be more suitable for treating of these low-graded sulfide ores. However, chalcopyrite is refractory in ferric/sulfuric acid media and shows slow dissolution rates. For this a number of researches were carried out to accelerate the kinetics of leaching by adding pyrite, iron powder, nanosized silica, coal and activated carbon. The main objective of the present work was to study the use of one biomass-derived activated carbon as catalysts in the leaching of copper from chalcopyrite. Sulfuric acid solution of pH 1 with 5 g L−1 of Fe3+ was used as leaching agent. Experiments were performed at 90 °C and 250 rpm, during 48 and 96 h. Concentration of Cu, Zn, As, Sb and Co in the liquid phase was determined in order to evaluate their extraction degree, whereas solid residues were characterized by SEM-EDS and XRD. The presence of biomass-derived activated carbon significantly increased the extraction of copper, decreasing the leaching of arsenic. Furthermore, the use of biomass-derived activated carbon led to lower amounts of crystalline sulfur in the final residue.
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