Synergistic depression mechanism of zinc sulfate and sodium dimethyl dithiocarbamate on sphalerite in Pb−Zn flotation system  

硫酸锌和二甲基二硫代氨基甲酸钠在铅锌浮选体系中对闪锌矿的协同抑制机理

作　　者：Yan-fang CUI Fen JIAO Wen-qing QIN Liu-yang DONG Xu WANG 崔艳芳;焦芬;覃文庆;董留洋;王旭(中南大学资源加工与生物工程学院,长沙410083)

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第9期2547-2555,共9页中国有色金属学报（英文版）

基　　金：Projects(51974364,51904339)supported by the National Natural Science Foundation of China;Project(2018TP1002)supported by the Hunan Province for Clean and Efficiency Utilization of Strategic Calcium-containing Mineral,China。

摘　　要：The depression mechanism of zinc sulfate(ZnSO4)and sodium dimethyl dithiocarbamate(DMDC)as the combined depressant on sphalerite was investigated by micro-flotation experiments,ion complexing tests,contact angle tests and X-ray photoelectron spectroscopy(XPS)analysis.The micro-flotation tests revealed that ZnSO4+DMDC had a better selective depression effect on sphalerite than using single ZnSO4 or DMDC.Ion complexing tests confirmed that DMDC had a strong complexing capacity with lead ions or hydroxy complexes.Contact angle tests illustrated that ZnSO4+DMDC makes the sphalerite surface more hydrophilic than ZnSO4 or DMDC.XPS analysis indicated that the combined depressant could prevent collector adsorbing on the Pb-activated sphalerite surface by a competitive adsorption method,while the combined depressant and collector were co-adsorbed on galena surface.通过浮选试验、离子络合测试、接触角测试和XPS分析,研究组合抑制剂硫酸锌(ZnSO4)和二甲基二硫代氨基甲酸钠(DMDC)对闪锌矿的抑制机理。浮选试验表明,与单一抑制剂ZnSO4和DMDC相比,组合抑制剂ZnSO4+DMDC对闪锌矿有更好的选择性抑制效果。离子络合试验表明,DMDC对铅离子或其羟基络合物有很强的络合能力。接触角测试证明,与单一抑制剂ZnSO4和DMDC相比,组合抑制剂ZnSO4+DMDC使闪锌矿表面更加亲水。XPS分析表明,组合抑制剂通过竞争吸附阻止捕收剂在铅离子活化后的闪锌矿表面吸附,而在方铅矿表面,组合抑制剂与捕收剂产生共吸附。

关 键 词：adsorption behavior contact angle COMPLEXATION GALENA SPHALERITE combined depressant 

分 类 号：TD952[矿业工程—选矿] TD923