羧甲基纤维素对磷灰石与白云石浮选分离的影响及机理研究  

Effect and Mechanism of Carboxymethyl Cellulose on Flotation Separation of Apatite Against Dolomite

作　　者：范宛惠 姬志杰 杨帆[1] 周峰 张汉泉[1] FAN Wanhui;JI Zhijie;YANG Fan;ZHOU Feng;ZHANG Hanquan(School of Resources&Safety Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学资源与安全工程学院,湖北武汉430205

出　　处：《矿产保护与利用》2024年第1期61-66,共6页Conservation and Utilization of Mineral Resources

基　　金：国家自然科学基金项目(51374156);武汉工程大学第十四届研究生教育创新基金资助项目(CX2022574)。

摘　　要：以磷灰石和白云石为研究对象,采用纯矿物浮选实验、红外光谱分析、Zeta电位分析等方法,探讨油酸钠体系中羧甲基纤维素(CMC)对两种矿物浮选分离的影响及作用机理。实验结果表明:油酸钠为捕收剂用量100 mg/L,在无抑制剂CMC时,白云石和磷灰石的回收率均在90%以上;而CMC质量浓度5 mg/L时,白云石与磷灰石的回收率分别为4.72%、95.52%,实现了白云石与磷灰石的高效分离。机理分析表明:油酸钠在磷灰石和白云石表面主要以物理吸附为主,而CMC可能与白云石表面的Mg2+“桥接”,阻碍了油酸钠在白云石表面的吸附,且其阻碍油酸钠在磷灰石表面吸附的能力很小,因此CMC对白云石具有较强的选择性抑制作用;在油酸钠体系中,随着CMC质量浓度的增大,磷灰石表面电位发生轻微负偏移,而白云石表面电位出现大幅负移,说明CMC能阻止油酸钠在白云石表面的吸附,却不影响油酸钠在磷灰石表面的吸附,因此能达到选择性抑制白云石浮选的效果。Effect of carboxymethyl cellulose(CMC)in sodium oleate system on the flotation separation of apatite against dolomite in single mineral experiments was investigated in this study,and its mechanism was further studied through infrared spectrum analysis and Zeta potential analysis.The recovery of apatite and dolomite both attained 90%with 100 mg/L sodium oleate,and changed to 95.52%and 4.72%,respectively with addition of 5 mg/L CMC.As a result,the efficient separation of apatite against dolomite was achieved.The adsorption of sodium oleate on the surface of apatite and dolomite was a physical process.CMC was connected with Mg2+on the surface of dolomite like a"bridge",and hindered the adsorption of sodium oleate on the surface of dolomite.The ability of CMC to hinder the adsorption of sodium oleate on the surface of apatite was extremely limited,so CMC would not influence the flotation of apatite.The Zeta potential results indicated that the surface potential of apatite had a slight negative shift with the increase of CMC concentration,while that of dolomite had a significantly negative shift,indicating that CMC can prevent the adsorption of sodium oleate on the surface of dolomite,but cannot prevent the adsorption of sodium oleate on the surface of apatite.

关 键 词：磷灰石 白云石 浮选 CMC 抑制 

分 类 号：TD923.14[矿业工程—选矿] TD971.3