氟硅酸钠对金红石和石榴石浮选分离的影响及作用机理  

Effect and Mechanism of Sodium Fluosilicate on Floatation Separation of Rutile and Garnet

作　　者：肖巍 杨娟 李和付 刘剑飞 赖春华 余俊甫 XIAO Wei;YANG Juan;LI Hefu;LIU Jianfei;LAI Chunhua;YU Junfu(School of Resource Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;Shanyang Qinding Mining Co.,Ltd.,Shangluo 726403,China;Mining Research Institute of Baotou Steel Group,Baotou 014100,China;Western Mining Group Technology Development Co.,Ltd.,Xining 810007,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055 [2]山阳秦鼎矿业有限责任公司,陕西商洛726403 [3]包钢集团矿山研究院(有限责任公司),内蒙古包头014100 [4]西部矿业集团科技发展有限公司,青海西宁810007

出　　处：《金属矿山》2023年第8期119-124,共6页Metal Mine

基　　金：国家自然科学基金项目(编号:5200040278);陕西自然科学基础研究计划项目(编号:2020JQ-667)。

摘　　要：为分离金红石与石榴石,在以亚硝基苯胲胺作捕收剂,硝酸铅做活化剂的体系中,研究抑制剂氟硅酸钠对金红石与石榴石浮选分离的影响,同时借助Zeta电位、接触角及X射线光电子能谱(XPS)分析了氟硅酸钠选择性抑制石榴石的作用机理。单矿物浮选实验表明氟硅酸钠对石榴石具有明显的选择抑制效果,在pH=6.5,抑制剂浓度80 mg/L条件下,石榴石回收率仅为6.13%,金红石仍保持较好的可浮性,回收率高达81.53%,两者回收率差异高达75.40个百分点,接触角及Zeta电位试验表明氟硅酸钠在石榴石上的吸附强度明显高于金红石,石榴石与氟硅酸钠发生了化学吸附,氟硅酸钠中的SiF_(6)^(2-)是抑制石榴石的主要组分,XPS证明了SiF_(6)^(2-)中的氟元素和石榴石表面的铁元素之间形成Fe—F化学键,石榴石表面没有了足够的活性位点供捕收剂作用,从而起到抑制石榴石的作用。In order to separate rutile and garnet,the effect of sodium fluosilicate on the floatation separation of rutile and garnet was studied in a system using nitrosophenylamine as collector and lead nitrate as activator.The mechanism of the selective separation of garnet by sodium fluosilicate was analyzed by means of Zeta potential,contact Angle and X-ray photoelectron spectroscopy(XPS).The results showed that the floatability difference between garnet and rutile reached 66.9%with a certain concentration of sodium fluosilicate,indicating that the inhibitor could effectively separate rutile and garnet.When sodium fluosilicate was added,the contact angle of garnet decreased by 49.2%.The zero electric point shifted to the negative potential direction,and the potential decreased significantly in the whole measurement range.The characteristic peaks of Fe decreased by 0.16,0.31 and 0.17 eV,respectively.This is because the fluorine element in SiF_(6)^(2-),the hydrolyzed component of sodium fluorosilicate,can form a ferric fluorine chemical bond with Fe^(2+)on the surface of garnet,resulting in the reduction of the chemisorbed active point of the collector-iron ion,and there is not enough active site for the action of the collector,so that the chemisorbed of the collector on the surface of garnet is reduced,achieving the purpose of selective inhibition.

关 键 词：金红石 石榴石 抑制剂 浮选 氟硅酸钠 

分 类 号：TD923[矿业工程—选矿]