摘要
针对白钨矿与萤石浮选分离难度大的问题,采用新型改性阴离子捕收剂α-溴代油酸钠(DBOA)与木质素磺酸钠(NaLS)协同作用体系,通过单矿物浮选试验、表面润湿性分析、Zeta电位、红外光谱及X射线光电子能谱(XPS)等手段,系统探究了DBOA对白钨矿与萤石的选择性分离机理。结果表明:在矿浆pH=8.0、DBOA用量为3 mg/L条件下,白钨矿回收率达92.68%;引入抑制剂NaLS后,在pH=8.0、药剂用量为50 mg/L条件下,白钨矿与萤石回收率差异扩大至82.5%,实现了二者的高效分离。DBOA通过与白钨矿表面Ca位点发生化学吸附,显著提升了矿物疏水性;而NaLS优先吸附于萤石表面Ca活性位点,通过磺酸基的强电负性阻碍DBOA与萤石作用,并增强其表面亲水性,导致二者疏水性和可浮性存在差异,从而实现浮选分离。
To address the challenging separation of scheelite from fluorite during flotation,this study employed a synergistic system combining a novel modified anionic collector sodiumα-bromooleate(DBOA)and sodium lignosulfonate(NaLS).Through single-mineral flotation tests,surface wettability analysis,Zeta potential measurements,infrared spectroscopy,and X-ray photoelectron spectroscopy(XPS),the selective separation mechanism of DBOA for scheelite and fluorite was systematically investigated.The results indicate that,under the conditions of pH=8.0 and a DBOA dosage of 3 mg/L,the recovery rate of scheelite reaches 92.68%.Upon introducing the depressant NaLS at pH=8.0 and at a dosage of 50 mg/L,the recovery difference between scheelite and fluorite expands to 82.5%,achieving efficient separation.DBOA significantly enhances the hydrophobicity of scheelite by chemically adsorbing onto its surface Ca sites,whereas NaLS preferentially adsorbs onto the Ca active sites of fluorite,blocking DBOA's interaction with fluorite via the strong electronegativity of sulfonic groups and increasing its surface hydrophilicity.This distinct difference in hydrophobicity and floatability enables effective flotation separation.
作者
陈佳丽
高鹏
刘杰
朱一民
CHEN Jiali;GAO Peng;LIU Jie;ZHU Yimin(State Key Laboratory of Mineral Processing,Northeastern University,Shenyang 110819,China;School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources,Shenyang 110819,China)
出处
《中国有色金属学报》
北大核心
2025年第9期3206-3215,共10页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(52130406)
辽宁省杰出青年基金资助项目(2024JH3/50100011)
兴辽英才计划领军人才项目(XLYC2402050)。
关键词
白钨矿
萤石
浮选分离
捕收剂
scheelite
fluorite
flotation separation
collector
