阿拉伯胶在镜铁矿与绿泥石浮选分离中的选择性抑制作用  

Selective depression action of gum arabic in flotation separation of specularite and chlorite

作　　者：王海川 杨诚 胡义明 李明阳 WANG Hai-chuang;YANG Cheng;HU Yi-ming;LI Ming-yang(School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243032,China;State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming 650093,China)

机构地区：[1]School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243032,China [2]State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming 650093,China

出　　处：《Journal of Central South University》2023年第9期3044-3056,共13页中南大学学报（英文版）

基　　金：Project(2022AH050305) supported by the Scientific Research Project of Colleges and Universities of Anhui Province,China;Project(CNMRCUKF2202) supported by the State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,China;Project(2022-JSKSSYS-07) supported by the State Key Laboratory of Safety and Health for Metal Mines,China。

摘　　要：绿泥石作为一种典型的含铁硅酸盐矿物,与镜铁矿的密度、比磁化系数和表面理化性质接近,导致绿泥石与镜铁矿分离极为困难。为解决这一问题,采用阿拉伯胶(GA)为选择性抑制剂,以十二胺(DDA)作为捕收剂来分离镜铁矿和绿泥石。通过浮选试验、吸附量试验、Zeta电位检测、接触角测试、傅里叶变换红外光谱(FT-IR)和X-射线光电子光谱(XPS)考察了GA的抑制作用机理。单矿物浮选结果表明,在pH值为8,GA和DDA的用量分别为90 mg/L和20 mg/L时,镜铁矿和绿泥石的回收率分别达到22.1%和82.4%。通过人工混合矿浮选试验进一步验证了GA对镜铁矿的选择性抑制作用。吸附量、接触角和Zeta电位检测均表明,GA对镜铁矿的吸附作用比绿泥石更强,且先吸附的GA会阻碍后续DDA的吸附,从而降低镜铁矿的可浮性。FT-IR和XPS分析结果表明,GA通过化学吸附作用于镜铁矿表面,其羟基与镜铁矿表面的铁位点相互作用,形成金属螯合物。最后,构建了GA在镜铁矿和绿泥石表面的吸附模型。As a typical iron-containing silicate,it is challenging to separate chlorite from specularite owing to their similar density,magnetic and surface physicochemical characteristics.Gum arabic(GA)was used as selective depressant for the separation of specularite from chlorite using dodecylamine(DDA)as the collector to resolve this issue.Moreover,the depressing mechanism of GA was investigated using flotation experiments,adsorption amounts measurement,Zeta potential detection,contact angle measurement,Fourier-transform infrared spectroscopy(FT-IR),and X-ray photoelectron spectroscopy(XPS).The single-mineral flotation results indicated that the recovery of specularite and chlorite reached 22.1%and 82.4%,respectively,with 90 mg/L GA and 20 mg/L DDA at pH=8.Furthermore,artificial mixed ore flotation test verified the selective depressing effect of GA on specularite.Surface adsorption,contact angle,and Zeta potential studies all indicated that GA has a more affinity for adhering to the surface of specularite than chlorite,and that pro-adsorbed GA inhibits the following adsorption of DDA,which reduces specularite’s capacity to float.The FT-IR and XPS analysis results demonstrated that GA adsorbs on the surface of specularite mainly via chemisorption,and the hydroxyl groups of GA interact with iron sites on the mineral surface to form metal chelates.

关 键 词：浮选 绿泥石 镜铁矿 阿拉伯胶 含铁硅酸盐 抑制剂 

分 类 号：TD923[矿业工程—选矿]