菱镁矿浮选体系中Fe^(3+)对白云石的选择性活化及机理分析  

Study on Reverse Flotation Process of Magnesite and Dolomite in Dodecylamine System

作　　者：班小淇 顾畔 印万忠[1,3] 姚金[1] 池冬瑞 郭万中 Ban Xiaoqi;Gu Pan;Yin Wanzhong;Yao Jin;Chi Dongrui;Guo Wanzhong(School of Resource and Civil Engineering,Northeastern University,Shenyang,Liaoning,China;The Construction Engineering Center of National New Raw Material Base of Liaoning Province,Shenyang,Liaoning,China;Genetic Mineral Processing Research Center,Northeastern University,Shenyang,Liaoning,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]辽宁省国家新型原材料基地建设工程中心,辽宁沈阳110819 [3]东北大学基因矿物加工研究中心,辽宁沈阳110819

出　　处：《矿产综合利用》2022年第5期126-130,共5页Multipurpose Utilization of Mineral Resources

基　　金：中央高校基本科研业务费项目(N180104017);国家自然科学基金面上项目(51974064)。

摘　　要：通过单矿物浮选实验,研究了在十二胺浮选体系中菱镁矿、白云石的浮选行为及调整剂Fe^(3+)对两种矿物可浮性的影响。依据傅里叶红外光谱(FTIR)、接触角测试研究了Fe^(3+)的作用机理。浮选实验结果表明:十二胺体系中,在矿浆自然pH值条件下,白云石的可浮性优于菱镁矿,菱镁矿与白云石具有一定的浮游差,添加少量的Fe^(3+)显著提升了两种矿物的浮游差。红外光谱测试结果表明:十二胺在白云石、菱镁矿表面的吸附主要是静电吸附,白云石-CH_(3)和-CH_(2)的对称和不对称拉伸振动的峰值增大。接触角测试结果表明:少量Fe^(3+)的加入使得白云石接触角明显增大,疏水性增强,对菱镁矿可浮性影响不大,起到了选择性活化白云石的作用。Through the single mineral flotation test,the flotation behavior of magnesite and dolomite in the dodecylamine flotation system and the influence of the regulator Fe^(3+) on the floatability of the two minerals were studied.Based on Fourier Infrared Spectroscopy(FTIR)and contact angle test,the mechanism of Fe^(3+) was studied.The flotation test results show that in the dodecylamine system,under the natural pH condition of the pulp,the floatability of dolomite is better than that of magnesite.There is a certain floatation difference between magnesite and dolomite,and the addition of a small amount of Fe^(3+) significantly improves the floatation difference of the two minerals.Infrared spectroscopy test results show that the adsorption of dodecylamine on the surface of dolomite is mainly electrostatic adsorption,dolomite CO_(3)^(2−)out-of-plane bending vibration and CO_(3)_(2−) in-plane bending vibration are almost unchanged,and-CH_(3) and-CH_(2) are symmetrical and asymmetrical.The peak value of extensional vibration increases.The contact angle test results show that the addition of a small amount of Fe^(3+) enhances the hydrophobicity of dolomite,which has the effect of activating dolomite.

关 键 词：菱镁矿 白云石 反浮选 选择性活化 

分 类 号：TD952[矿业工程—选矿]