草酸对锡石可浮性的影响及其作用机理研究  

Effect and Mechanism of Oxalic Acid on the Floatability of Cassiterite

作　　者：朱丽佳 刘杰[1] 郭珍旭 吕良[2,3] Zhu Lijia;Liu Jie;Guo Zhenxu;LU Liang(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;State Key Laboratory of Comprehensive Utilization Evaluation of Polymetallic Ore,Ministry of Natural Resources,Zhengzhou 450000,China;Zhengzhou Institute of Comprehensive Utilization of Mineral Resources,Chinese Academy of Geological Sciences,Zhengzhou 450000,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]自然资源部多金属矿综合利用评价重点实验室,河南郑州450000 [3]中国地质科学院郑州矿产综合利用研究所,河南郑州450000

出　　处：《金属矿山》2020年第4期72-77,共6页Metal Mine

基　　金：国家自然科学基金项目(编号:51674066,51774069,5197041089)。

摘　　要：为探究苯乙烯膦酸(SPA)捕收剂体系下作为脉石抑制剂的草酸对锡石可浮性的影响,进行了浮选试验,并利用溶液化学计算、动电位检测和红外光谱分析等手段探究其作用机理。在2<pH<10范围内,80 mg/L的SPA捕收剂体系下锡石回收率高于79.37%,加入4 mg/L的草酸后,草酸对锡石的抑制作用随pH的增加而增加,在pH>10时,锡石无法有效回收。根据锡石、萤石、方解石的浮选行为提出了锡石反浮选除杂的新思路。溶液化学计算、动电位检测和红外光谱分析表明草酸和SPA均能化学吸附于锡石表面,草酸在锡石表面生成了稳定的草酸锡络合物,草酸与SPA在锡石表面的吸附互相受到对方存在的影响。抑制机理解释为草酸在锡石表面的吸附增加了其亲水性同时占据了活性位点,从而抑制了锡石的浮选,研究结果为草酸对锡石浮选行为影响的机理提供了参考。The influence of oxalic acid on the floatation of cassiterite under the styrene phosphonic acid(SPA)collector system was investigated by flotation tests.Solution chemistry calculations,Zeta potential determination and infrared spectroscopy were used to explore its mechanism.The results of flotation experiments revealed that the recovery of cassiterite was above 79.37%in the pH value range of 2~10,with 80 mg/L SPA as the collector.After 4 mg/L of oxalic acid was added,the inhibitory effect of oxalic acid on cassiterite increased with increasing pH,and cassiterite could not be effectively recovered when the pH value was above 10.Based on the flotation behavior of cassiterite,fluorite and calcite,a new idea of reverse-flotation was proposed.Solution chemical calculation,Zeta potential measurement and infrared spectrum analysis demonstrated that both oxalic acid and SPA could chemically adsorb on the surface of cassiterite.Oxalic acid formed a stable tin oxalate complex on the surface of cassiterite,the adsorption of the two kinds reagents was affected by each other's existence.The inhibition mechanism is explained as the adsorption of oxalic acid on the surface of cassiterite increases its hydrophilicity and occupies active sites.This article provides a reference for the mechanism of the influence of inhibitors on cassiterite flotation behavior.

关 键 词：锡石 苯乙烯膦酸 草酸 浮选 抑制 

分 类 号：TD923[矿业工程—选矿]