【作者】 谷晓恬； 朱一民； 李艳军； 韩跃新；

【Author】 Gu Xiaotian;Zhu Yimin;Li Yanjun;Han Yuexin;College of Resource and Civil Engineering, Northeastern University;2011 Collaborative Innovation Centre of Steel Technology,Northeastern University;Liaoning Technology and Engineering Laboratory of Effective Exploitation of Refractory Iron Ores;

【机构】 东北大学资源与土木工程学院； 东北大学2011钢铁共性技术协同创新中心； 辽宁省难采选铁矿石高效开发利用技术工程实验室；

【摘要】 针对含少量碳酸盐的难选铁矿石高效选别,本文对赤铁矿、磁铁矿、菱铁矿及石英四种单矿物分别进行浮选试验,考察了新型高效氨基羧酸类捕收剂α-EDA-LA对四种矿物在不同p H下的捕收行为;通过动电位测试与红外光谱分析,重点分析α-EDA-LA与石英及菱铁矿的吸附机理。浮选结果显示在α-EDA-LA 200 mg/L及浮选温度18°C条件下,在p H 6~12范围内α-EDA-LA对石英回收率均在90%以上;在p H为8时,菱铁矿回收率达最高83.4%。动电位测试结果显示在浮选p H条件下,α-EDA-LA吸附在荷负电的矿物表面,使其动电位降低,说明同荷负电的药剂与矿物表面能够克服同性电荷间的排斥作用而发生吸附。红外光谱分析显示α-EDA-LA对石英的捕收主要以氢键吸附为主;α-EDA-LA对菱铁矿的捕收以化学键合吸附为主,氢键耦合吸附为辅。更多还原

【Abstract】 A novel and highly-efficient collector was studied, aiming at effective beneficiation of carbonate-containing refractory hematite ores. The collector is amino-acid-based, of which the main composition is α-ethylenediamine lauric acid(α-EDA-LA). Single mineral flotation tests were carried out for hematite, magnetite, siderite and quartz, respectively. The objective was to investigate the floatability of the single minerals across the p H range from 6 to 12. All tests were conducted with 200 mg/L of α-EDA-LA and 18oC of flotation temperature. Zeta potential and Fourier transform infrared spectroscopy(FTIR) were used to identify the adsorption mechanisms of α-EDA-LA on quartz and siderite surfaces. The flotation results showed that the quartz recovery was over 90% at p H of 6~12. For siderite, the recovery peaked at 83.4% when p H was 8.0, where siderite presented different floatability from magnetite and hematite. Exploiting such difference, the separation of siderite could be achieved. Zeta-potential measurements showed that α-EDA-LA adsorption on the surfaces of siderite and quartz decreased the respective zeta potential at p H of 8~10 and 8~12, respectively. This means the adsorption overcome the electrostatic repulsion between similar charges of α-EDA-LA and the mineral surfaces. FTIR results suggest that α-EDA-LA was adsorbed on quartz via hydrogen bond formation. Between α-EDA-LA and siderite, the adsorption was dominated by chemisorption, while further enhanced by hydrogen bonding.更多还原