C8碳链烷基羟肟酸对孔雀石的浮选性能及吸附机理  

Flotation behavior and adsorption mechanism of C_8-chain alkyl hydroxamic acid to malachite

作　　者：许海峰 陈雯[1] 钟宏[3] 黄唯平[2] 戴宽 

机构地区：[1]长沙矿冶研究院有限责任公司,长沙410012 [2]南开大学化学学院,天津300071 [3]中南大学化学化工学院,长沙410083

出　　处：《中国有色金属学报》2018年第1期189-198,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2013AA064102);中国博士后科学基金资助项目(2016M591382)2016-11-02;

摘　　要：通过纯孔雀石、硫化-氧化混合铜矿浮选试验、FT-IR光谱分析、Zeta电位测试、捕收剂及矿物溶液化学分析和DFT计算研究2-乙基-2-烯己基羟肟酸(EHHA)对孔雀石矿物的直接浮选性能及吸附机理。纯矿物浮选试验结果表明:EHHA是一种直接浮选孔雀石矿物的优良捕收剂,在矿浆pH值6、用量200 mg/L的浮选条件下,EHHA能直接浮选出95.33%的孔雀石。实际矿石浮选试验结果表明:EHHA在弱酸性条件下直接浮选硫化-氧化铜矿与使用异丁基黄药(IBX)捕收剂硫化浮选相比较,EHHA所取得的粗精矿中Cu回收率高了1.87%。FT-IR光谱和Zeta电位测试结果表明:EHHA通过形成五元螯合环吸附于孔雀石矿物表面。孔雀石和捕收剂的溶液化学分析表明:EHHA通过与矿物表面的Cu^(2+)螯合成沉淀而发生吸附,OHA通过与孔雀石矿物表面的水合铜离子发生表面化学反应而吸附于矿物表面,相关的FT-IR分析结果进一步证实这一结论。DFT计算结果表明:EHHA比IBX拥有更大的偶极矩,更高的Mulliken电荷,对孔雀石矿物的捕收能力更强。The direct flotation behavior and adsorption mechanism of 2-ethyl-2-hexenoic hydroxamic acid （EHHA） to malachite were investigated by micro-flotation tests of pure minerals, bench scale flotation tests of sulfide-oxide mixed actual copper ore, FT-IR spectra, Zeta potential measurements, solution chemistry analyses of collectors and minerals, and density functional theory （DFT） calculations. The direct micro-flotation results of pure minerals indicate that EHHA exhibits superior flotation performance to malachite, and floates out 95.33% malachite at pH=6 with dosage of 200 mg/L. The results of flotation tests of sulfide-oxide actual copper ore show that, the Cu recovery rate obtained by EHHA’s direct flotation under the condition of weak acid pulp is 1.87% higher than that obtained by isobutyl xanthate’s （IBX） sulfide flotation. The analyses of FT-IR spectra and Zeta potential demonstrate that EHHA might chemisorb onto malachite surfaces by form of five-membered chelates. The solution chemistry analyses of collectors and minerals indicate that EHHA and OHA might be adsorbed onto malachite surfaces by form of chelates with Cu2＋ and Cu2＋ hydroxyl complex compounds, respectively, and the related FT-IR analysis results further confirm this conclusion. DFT calculation results imply EHHA owns stronger affinity to malachite due to owning a larger dipole moment and higher Mulliken charge comparing to IBX.

关 键 词：2-乙基-2-烯己基羟肟酸 孔雀石 浮选 吸附 

分 类 号：TQ031.2[化学工程] O624.5[理学—有机化学]