没食子酸对方解石的抑制作用及作用机理  

Depression Effect and Mechanism of Gallic Acid on Calcite

作　　者：吴卫国[1,2] 朱阳戈[1,2] 

机构地区：[1]北京矿冶研究总院 [2]矿物加工科学与技术国家重点实验室

出　　处：《金属矿山》2013年第8期57-60,共4页Metal Mine

基　　金：国家自然科学基金项目(编号:51204019)

摘　　要：为了给解决非硫化矿石浮选体系中方解石的抑制难题提供借鉴,通过单矿物浮选试验、捕收剂吸附量测定和红外光谱检测,系统研究了油酸钠浮选体系中没食子酸对方解石的抑制作用及作用机理。结果表明:在矿浆pH为9～11、油酸钠用量为1.0×10-4 mol/L条件下,添加5×10-5 mol/L没食子酸可将方解石完全抑制。没食子酸之所以对方解石有良好的抑制作用,是因为其分子中的两个羟基能与方解石表面的Ca2+离子形成螯合物,该螯合物可阻止油酸钠在方解石表面的吸附,并在方解石表面形成亲水膜。In order to provide reference for solving the inhibition problem of calcite in non-sulphide flotation system,the depression effect and mechanism of gallic acid on calcite in sodium oleate flotation system was studied through flotation tests,collector＇s adsorption measurements and infrared spectroscopic analysis.The results show that calcite is significantly depressed with the addition of gallic acid of 5 × 10-5 mol / L in pH range of 9 ～ 11 and the concentration of sodium oleate of 1.0 × 10-4 mol / L.The depression effect originates from hydrophilic chelate on the surface of calcite,which is formed by the reaction between the two hydroxyls in gallic acid and Ca2 ＋ on calcite surface.The formed chelate prohibits the adsorption sodium oleate on calcite surface,and generates hydrophilic membrane on calcite surface.

关 键 词：没食子酸 方解石 浮选 抑制 吸附 螯合物 

分 类 号：TD951.1[矿业工程—选矿]