Effects of BaCl_2 on K-feldspar flotation using dodecyl amine chloride under natural pH  

自然pH条件下BaCl_2对钾长石盐酸十二胺浮选的影响（英文）

作　　者：Chao SONG Yuan-yuan ZHOU Quan-jun LIU Jian-ying DENG Shi-mei LI Li-kun GAO Li YU 宋超;周圆圆;刘全军;邓建英;李世美;高利坤;余力(昆明理工大学国土资源工程学院复杂有色金属资源清洁利用国家重点实验室,昆明650093;郑州航空工业管理学院机电工程学院河南省航空材料与应用技术重点实验室,郑州450046)

机构地区：[1]State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China [2]Henan Key Laboratory of Aeronautical Materials and Application Technology,School of Mechatronics Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450046,China

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第11期2336-2342,共7页中国有色金属学报（英文版）

基　　金：Project(51764021)supported by the Key Program of the National Natural Science Foundation of China

摘　　要：The effects of BaCl2 on the flotation of K-feldspar using dodecyl amine chloride as the collector under natural pH wereinvestigated by flotation tests, absorption measurements, Fourier transform infrared spectroscopy （FTIR） and X-ray photoelectronspectroscopy （XPS）. The results indicated that lower BaCl2 concentration can increase the floatability of K-feldspar, whereas higherBaCl2 concentration can significantly inhibit the flotation of K-feldspar. Peaks at 3548.18, 3475.56 and 3414.35 cm？1in the FTIRspectra of K-feldspar adsorbed by dodecyl amine chloride revealed three forms of -OH. XPS analyses of K-feldspar adsorbed byBa2＋ showed that the concentration of K atom was reduced by nearly twice as those of Si, Al, and O. The activation of BaCl2 at a lowconcentration was mainly caused by Ba2＋ in the form of the ion exchange between K＋ and Ba2＋. The inhibitory action of BaCl2 at ahigh concentration is mainly attributed to the physical absorption of Ba2＋ on the surface of K-feldspar and the fact that a highconcentration of Cl？ causes the chemical equilibrium of dodecyl amine chloride to be changed, and the dodecyl amine chloride in theform of RNH2H＋ is reduced.采用浮选试验、吸附量测定、傅里叶转换红外光谱分析(FTIR)以及X射线光电子能谱分析(XPS)研究自然pH条件下BaCl2对钾长石盐酸十二胺浮选的影响。研究结果表明,低浓度BaCl2对钾长石的浮选具有活化作用,高浓度BaCl2对钾长石浮选具有抑制作用。位于3548.18、3475.56和3414.35cm-1的红外光谱谱峰表明盐酸十二胺与钾长石表面作用后有3种不同—OH基团存在。XPS分析结果表明,Ba2+在钾长石表面吸附后,长石表面K原子的浓度降低程度是Si、Al和O原子的两倍。低浓度下BaCl2的活化作用可归因于矿物表面K+和Ba2+的离子交换作用;高浓度下Ba Cl2的抑制作用可归因于矿物表面Ba2+的物理吸附;同时矿浆中Cl-浓度的增加也会导致盐酸十二胺溶解平衡的移动,RNH2H+的浓度降低。

关 键 词：K-FELDSPAR BACL2 dodecyl amine chloride ACTIVATION FLOTATION 

分 类 号：TD923[矿业工程—选矿]