用Mac-12提高德兴铜矿铜金钼回收率的研究

对新型选铜捕收剂M ac-12进行了紫外-可见光谱分析、密度泛函计算和工业试验研究,结果表明,溶液中Cu2 和Cu 离子与M ac-12能发生化学作用而生成新物质,而M ac-12与Fe2 或Fe3 离子之间不存在化学作用;新药剂M ac-12的反应中心硫原子给电子的能力较弱,而接受反馈电子的能力很强,其对提供反馈电子能力较弱的硬酸黄铁矿的捕收能力弱,而对易提供反馈电子的软酸黄铜矿的捕收能力强;与传统黄药工艺(70 g/t)相比,M ac-12 少量丁黄药(25 g/t)工艺可降低铜硫浮选分离的石灰用量,提高铜精矿中铜品位0.93个百分点、铜回收率1.03个百分点,金品位1.29 g/t、金回收率7.16个百分点,钼品位0.029 3个百分点、钼回收率3.90个百分点。M ac-12捕收剂已工业应用于德兴铜矿,取得了好的经济效益。

Research on Raising Copper and Molybdenum Recoveries by Mac-12 in Dexing Copper Mine

UV-visible spectra,density functional calculation and industrial tests were made on Mac-12,a new copper collector.The results showed that Mac-12 collector reacted chemically with Cu~(2 ) and Cu~ ions in the solution to generate new substance while no chemical reaction was observed between Mac-12 and Fe~(2 ) or Fe~(3 ) ion.The new Mac-12 reagent's reaction centrer is sulfur atom,which has weak ability to donate its electrons but very strong ability to accept feedback electrons.Therefore,Mac-12 has weak collecting power for pyrite(hard acid) having weak ability to offer feedback electrons,while strong collecting power for chalcopyrite(soft acid) that has strong ability to offer feedback electrons.Compared with traditional xanthate flotation process(70 g/t),Mac-12 a little amount of butyl xanthate(25 g/t) process can reduce the lime dosage in flotation for copper-sulfur separation and raise the copper concentrate's copper grade by 0.93 percentrage point(PP) and recovery by 1.03 PP;gold grade by 1.29 g/t and recovery by 7.16 PP;and molybdenum grade by 0.0293 PP and recovery by 3.90 PP.Mac-12 collector has been used in industrial production in Dexing Copper Mine and achieved good economic benefit.