磷酸体系下白云石与脂肪酸类捕收剂作用研究  

Interaction Mechanism of Dolomite and Fatty Acid Collector in Phosphoric Acid System

作　　者：章铁斌 张覃 卯松[1,3,4] 敖先权 ZHANG Tie-bin;ZHANG Qin;MAO Song;AO Xian-quan(College of Mining,Guizhou University,Guiyang 550025,Guizhou,China;Guizhou Academy of Science,Guiyang 550001,Guizhou,China;National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas,Guiyang 550025,Guizhou,China;Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources,Guiyang 550025,Guizhou,China;College of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,Guizhou,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]贵州科学院,贵州贵阳550001 [3]喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州贵阳550025 [4]贵州省非金属矿产资源综合利用重点实验室,贵州贵阳550025 [5]贵州大学化学与化工学院,贵州贵阳550025

出　　处：《矿冶工程》2022年第4期60-63,共4页Mining and Metallurgical Engineering

基　　金：国家重点研发计划项目(2018YFE0110300);贵州省科技计划项目(黔科平台人才[2020]4015)。

摘　　要：采用单矿物浮选试验、Zeta电位测试和分子模拟手段研究了磷酸对白云石表面吸附油酸阴离子的影响。浮选试验和Zeta电位测试结果显示,磷酸导致白云石电负性增强,可浮性降低。分子模拟结果显示,白云石表面形成CO_(3)^(2-)空位缺陷,磷酸离子与缺陷处的Ca、Mg原子形成桥位吸附,缺陷处剩余的Ca、Mg原子可以进一步吸附油酸阴离子。油酸阴离子和H_(2)PO_(4)^(-)可以共同吸附在白云石表面导致白云石疏水;H_(2)PO_(4)^(-)的预先作用导致油酸根离子吸附能减小可能是白云石可浮性下降的原因。The effect of H_(3)PO_(4) on adsorption of oleate anions on dolomite surface was studied by pure mineral flotation test,Zeta potential test and molecular simulation.The results of flotation test and Zeta potential test show that H_(3)PO_(4) enhances electronegativity and reduces floatability of dolomite.The results of Molecular simulation show that CO_(3)^(2-) vacancy defects are formed on the dolomite surface.Then,H_(2)PO_(4)^(-)anions react with part of Ca and Mg atoms on the defect of dolomite surface,resulting in adsorption at bridge site,and the other part of Ca and Mg atoms can further adsorb oleate anions.The common absorption of oleate anion and H_(2)PO_(4)^(-)on the dolomite surface can lead to hydrophobic dolomite.The pre⁃reaction of H_(2)PO_(4)^(-)reduces the adsorption energy of oleate anion,which may be the reason for the decrease of floatability of dolomite.

关 键 词：白云石 磷灰石 捕收剂 油酸 空位缺陷 脂肪酸 密度泛函理论 

分 类 号：TD923[矿业工程—选矿]