方解石在硫酸溶液中表观密度变化规律及其对分选的影响  

Change Law of Apparent Density of Calcite in Sulfuric Acid Solution and Its Influence on Separation

作　　者：赵睿祺 邓荣东[1,2] 陈佳林 毛志东 魏祥杰 方辰烨 李怀熠 ZHAO Ruiqi;DENG Rongdong;CHEN Jialin;MAO Zhidong;WEI Xiangjie;FANG Chenye;LI Huaiyi(Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350108,Fujian,China;Fujian Key Laboratory of Green Extraction and High-Value Utilization of New Energy Metals,Fuzhou 350108,Fujian,China)

机构地区：[1]福州大学紫金地质与矿业学院,福建福州350108 [2]福建省新能源金属绿色提取与高值利用重点实验室,福建福州350108

出　　处：《矿冶工程》2024年第6期54-59,65,共7页Mining and Metallurgical Engineering

基　　金：国家自然科学基金青年基金(51804080)。

摘　　要：研究了酸反应过程中硫酸质量分数、方解石粒径、十二烷基硫酸钠(SDS)添加量和动态流体流速对方解石颗粒表观密度的影响。结果表明:硫酸质量分数1%时,方解石能稳定在低表观密度状态,且方解石粒径越小,表观密度越低;质量浓度300 mg/L的SDS能够增强方解石表面疏水性,有效增加CO_(2)气泡在矿物表面的吸附密度和停留时间,延长方解石颗粒的低表观密度时间;动态流体会加速气泡从方解石表面脱附,不利于酸反应过程中降低方解石表观密度,而SDS处理能显著减小这种不利影响。沉降试验结果表明,酸反应能延长方解石颗粒的沉降时间,创造有利分选条件,能通过重选实现方解石与非碳酸盐矿物的分离。The effects of sulfuric acid concentration,calcite particle size,sodium dodecyl sulfate(SDS) dosage and flow rate of dynamic fluid on the apparent density of calcite particles during acid reaction were studied.The results show that when the sulfuric acid concentration is 1%,calcite can sustain at the low apparent density state,and the smaller the calcite sizes,the lower the apparent densities.SDS with a concentration of 300 mg/L can enhance the hydrophobicity of calcite,increase effectively the adsorption density and residence time of CO_(2) bubbles on calcite,and prolong the duration of low apparent density of calcite.Dynamic fluids may accelerate desorption of gas bubbles from calcite,which is detrimental to the reduction of apparent density of calcite during acid reaction process,but the SDS treatment can significantly reduce this detrimental effect.Settling tests show that acid reaction can prolong the settling time of calcite particles,creating favorable conditions for the separation of calcite and non-carbonate minerals by gravity concentration.

关 键 词：方解石 表观密度 CO_(2)气泡 十二烷基硫酸钠 动态流体 萤石 流态化分选 硫酸 

分 类 号：TD922[矿业工程—选矿]