萤石表面钙质点的加温溶出对其浮选行为的影响  

Influence of Calcium Point Dissolution Action on Fluorite Flotation Behavior

作　　者：徐诗佟 黄海威 任嗣利 吴志强 XU Shitong;HUANG Haiwei;REN Sili;WU Zhiqiang(School of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州341000

出　　处：《金属矿山》2022年第3期143-148,共6页Metal Mine

基　　金：江西省青年科学基金项目(编号:20202BABL214019);江西省教育厅科学技术研究项目(编号:GJJ170538);江西省“双千计划”创新领军人才项目(编号:Jxsq2018101018);赣州市科技创新人才计划项目;大学生创新创业训练计划项目(编号:201910407001)。

摘　　要：为明确加温对萤石浮选特性的影响,利用量子化学及分子动力学计算模拟研究了加温条件下萤石表面钙质点的溶出行为及加温对萤石浮选行为的影响,通过纯矿物浮选试验,钙离子溶出量、油酸根吸附量及萤石表面原子丰度的测定进一步分析了加温影响萤石浮选特性的原因。结果表明:①油酸根在萤石表面吸附的主要位点是钙质点,且吸附作用的方式是化学吸附;在常温条件下,该吸附作用稳定,吸附的油酸根不会由于萤石表面原子弛豫产生的位移轻易进入液相环境中。②温度升高会促进萤石表面钙质点的溶出,温度越高,钙质点的溶出量也越大;随着钙质点的不断溶出,在萤石表面钙质点吸附的油酸根也将出现脱附现象,因而加温对于油酸根在萤石表面的直接吸附起负效应,最终导致萤石浮选回收率下降。In order to clarify the effect of heating on fluorite flotation characteristics,quantum chemistry and molecular dynamics calculations were used to simulate the dissolution behavior of calcium points on fluorite surface and the influence of heating on fluorite flotation behavior.Through pure mineral flotation tests,determination of calcium ion dissolution,oleate adsorption and atomic abundance on fluorite surface,the influence of temperature on the flotation characteristics of fluorite was further analyzed.The results showed that:①The main adsorption site of oleate on fluorite surface is calcium point,and the adsorption mode is chemical adsorption.The adsorption is stable at room temperature and the adsorbed oleate cannot easily enter the liquid phase although the displacement appear due to the atomic relaxation on fluorite surface.②The increase of temperature can promote the dissolution of calcium points on fluorite surface.The higher the temperature is,the more calcium points are dissolved.With the continuous dissolution of calcium points,the adsorption of oleate on the surface of fluorite will also appear desorption phenomenon,so heating has a negative effect on the direct adsorption of oleate on the surface of fluorite,and finally leads to the decline of fluorite flotation recovery rate.

关 键 词：萤石 加温浮选 量子化学计算 分子动力学模拟 钙离子 吸附量 

分 类 号：TD952[矿业工程—选矿] TD923