摘要
PMA-EDTC(聚马来酸-(2-乙基二硫代氨基甲酸)马来酰氨酸)通过在大分子骨架PMA(聚马来酸)上引入功能性小分子EDTC((2-氨基乙基)二硫代氨基甲酸),从而在矿物抑制方面表现出优异性能。研究合成了不同接枝率及分子量的PMA-EDTC,采用单矿物浮选试验的方法探讨接枝率及分子量对其铜铅分离过程中方铅矿抑制行为的影响,并通过吸附量及TOF-SIMS分析等方法深入研究PMA-EDTC在方铅矿表面的作用机理。结果表明,单矿物浮选试验中PMA-EDTC分子量与方铅矿的抑制效果呈正相关,高分子量的PMA-EDTC在铜铅分离的过程中对方铅矿的抑制效果更强。在对不同接枝率PMA-EDTC进行单矿物浮选试验中,PMA-EDTC的抑铅性能并不与接枝率呈正向增长趋势,PMA-EDTC的接枝率达到15%时对方铅矿的抑制能力最强。吸附量测试也证明接枝率的大小与PMA-EDTC在方铅矿表面的吸附量并不成正相关,15%接枝率的PMA-EDTC在方铅矿表面的吸附量要高于10%及20%接枝率的PMA-EDTC。TOF-SIMS结果表明,PMA-EDTC在方铅矿表面存在化学吸附,其能够与方铅矿表面的Pb^(2+)位点发生结合,生成物为CHC_(6)O_(3)H_(9)N_(2)CS_(2)Pb等物质,使方铅矿表面形成亲水性大分子薄膜从而达到抑制方铅矿上浮的目的。
PMA-EDTC(Poly(maleic acid)-(2-ethyl dithiocarbamate)maleamide)exhibitsexcellent performance in mineral inhibition by introducing the functional small molecule EDTC((2-aminoethyl)dithiocarbamate)onto the polymer backbone of PMA(poly(maleic acid)).Inthisstudy,PMA-EDTC with varying grafting ratios and molecular weights were synthesized.The influence of grafting ratio and molecular weight on the inhibition behavior of galena during copper-lead separation was investigated through single mineral flotation tests.Additionally,adsorption measurements and TOF-SIMS analysis were employed to elucidate the action mechanism of PMA-EDTC on the galena surface.The results indicated a positive correlation between the molecular weight of PMA-EDTC and its inhibitory effect on galena in the single mineral flotation tests,with higher molecular weight PMA-EDTC demonstrating stronger inhibition of galena in the copper-lead separation process.In the single mineral flotation tests with PMA-EDTC of different grafting ratios,the inhibitory performance of PMA-EDTC on galena did not show a linear increase with grafting ratio.Instead,PMA-EDTC with a 15%grafting ratio exhibited the highest inhibitory capacity on galena,Adsorption measurements corroborated that the adsorption amount of PMA-EDTC on the galena surface did not correlate positively with the grafting ratio,with PMA-EDTC having a 15%grafting ratio showing higher adsorption on galena than those with 10%and 20%grafting ratios.TOF-SIMS results revealed that PMA-EDTC undergoes chemical adsorption on the galena surface,binding with Pb^(2+)sites to form compounds such as CHC_(6)O_(3)H_(9)N_(2)CS_(2)Pb.This interaction results in the formation of a hydrophilic polymer film on the galena surface,thereby inhibiting the flotation of galena.
作者
曾红
卢通
孙传尧
朱阳戈
张行荣
ZENG Hong;LU Tong;SUN Chuanyao;ZHU Yangge;ZHANG Xingrong(School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Mineral Processing,Beijing 102628,China;College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,Shandong,China)
出处
《有色金属（选矿部分）》
CAS
2024年第12期139-147,共9页
Nonferrous Metals（Mineral Processing Section）
基金
国家自然科学基金资助项目(U20A20269)。
关键词
铜铅分离
抑制剂
机理分析
接枝率
分子量
separation of Mo-Pb
inhibitors
mechanism analysis
graft rate
molecular weight
