Adsorption behavior and mechanism of Bi(Ⅲ) ions on rutile-water interface in the presence of nonyl hydroxamic acid  

铋离子在壬基异羟肟酸中金红石-水界面的吸附行为及机制（英文）

作　　者：肖巍 曹攀[1,2] 梁倩楠 黄小涛[1,2] 李开运 张雁生 覃文庆 邱冠周[1,2] 王军 

机构地区：[1]中南大学生物冶金教育部重点实验室,长沙410083 [2]中南大学资源加工与生物工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第2期348-355,共8页中国有色金属学报（英文版）

基　　金：Project(51474254)supported by the National Natural Science Foundation of China;Project(2013M531813)supported by the China Postdoctoral Science Foundation;Project(2016zzts111)supported by the Independent Exploration and Innovation Program of Central South University,China;Project(CSUZC201715)supported by Open-End Fund for the Valuable and Precision Instruments of Central South University,China

摘　　要：The adsorption behavior and mechanism of Bi（Ⅲ） ions on the rutile-water interface were investigated through micro-flotation, Zeta potential measurement, adsorption amount measurement and X-ray photoelectron spectroscopy（XPS）. According to the results of micro-flotation, Bi（Ⅲ） ions could largely improve the rutile flotation recovery（from 62% to 91%）, and they could increase the activating sites and reduce the competitive adsorption between nonyl hydroxamic acid negative ions and OH-ions, which determined that Bi（Ⅲ） ions were capable of activating rutile flotation. The adsorption of Bi（Ⅲ） ions onto the rutile surface led to the shift of Zeta potential into the positive direction, which was good for the adsorption of nonyl hydroxamic acid anions. In addition, the results of XPS indicated that the chemical environment around Ti atom had not changed before and after the adsorption of Bi（Ⅲ） ions. Based on the adsorption mechanism of Bi（Ⅲ） ions, it was deduced that firstly Bi（Ⅲ） ions occupied the vacancies of the original Ca^2＋, Mg^2＋ and Fe^2＋ ions on the rutile surface; secondly Bi（Ⅲ） ions covered on the rutile surface in the form of hydroxides.通过单矿物浮选、动电位测试、吸附量测试和X射线光电子能谱研究Bi(Ⅲ)在金红石-水界面的吸附行为和机制。单矿物浮选结果表明,加入Bi(Ⅲ)后,金红石的浮选回收率由62%提高到91%。添加Bi(Ⅲ)可以增加活性位点,降低壬基异羟肟酸阴离子与OH-离子之间的竞争吸附,这是Bi(Ⅲ)能够活化金红石浮选的本质。Bi(Ⅲ)吸附在金红石表面,导致Zeta电位正移,有利于壬基异羟肟酸的吸附。XPS结果显示,Bi(Ⅲ)吸附前后,钛原子周围的化学环境没有发生变化。Bi(Ⅲ)在金红石-水界面有两种吸附方式:一种是Ca^(2+)、Mg^(2+)和Fe^(2+)溶解后,Bi(Ⅲ)占据其空位;另一种是Bi(Ⅲ)以羟基化合物的形式覆盖在金红石表面。

关 键 词：RUTILE FLOTATION activation of Bi（Ⅲ） ions competitive adsorption activation sites 

分 类 号：O647.3[理学—物理化学]