十二胺体系中铁离子对霓石浮选的影响及其作用机理

doi:10.12034/j.issn.1009-606X.219110

过程工程学报 ›› 2019, Vol. 19 ›› Issue (5): 1014-1021.DOI: 10.12034/j.issn.1009-606X.219110

十二胺体系中铁离子对霓石浮选的影响及其作用机理

李明阳^1,2，皇甫明柱¹，胡义明^1*，刘军³，高翔鹏¹，刘文宝⁴

1. 安徽工业大学冶金工程学院，安徽马鞍山 243032 2. 安徽工业大学冶金减排与资源综合利用教育部重点实验室，安徽马鞍山 243032 3. 中钢集团马鞍山矿山研究院有限公司，安徽马鞍山 243071 4. 东北大学资源与土木工程学院，辽宁沈阳 110819

收稿日期:2019-01-15 修回日期:2019-03-17 出版日期:2019-10-22 发布日期:2019-10-22
通讯作者: 胡义明 13855515822@126.com
基金资助:
高芳烃高含氮重油催化转化反应基础研究;安徽省重点研究和开发计划项目;安徽省重点研究和开发计划项目;安徽工业大学青年基金项目

The effect and mechanism of iron ion on flotation of aegirite in dodecylamine system

Mingyang LI^1,2, Mingzhu HUANGFU¹, Yiming HU^1*, Jun LIU³, Xiangpeng GAO¹, Wenbao LIU⁴

1. School of Metallurgy and Resource, Anhui University of Technology, Ma?anshan, Anhui 243032, China
2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Ma?anshan, Anhui 243032, China
3. Sinosteel Ma?anshan Institute of Mining Research Co., Ltd., Ma?anshan, Anhui 243071, China
4. School of Resources & Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, China

Received:2019-01-15 Revised:2019-03-17 Online:2019-10-22 Published:2019-10-22

摘要/Abstract

摘要： 以十二胺(DDA)为捕收剂，通过单矿物浮选实验考察了不同矿浆pH值和铁离子浓度下霓石的浮选行为，利用人工混合矿浮选实验研究了铁离子对霓石?镜铁矿分离效果的影响。结合Zeta电位检测、Fe3+水解组分浓度计算、玻尔兹曼理论分析和分子动力学模拟研究了在DDA体系中铁离子对霓石的抑制机理。结果表明，铁离子对霓石的可浮性抑制作用较大，在pH=6.8及DDA浓度3.6×10?4 mol/L、无铁离子条件下，霓石回收率高达75.72%，溶液中铁离子浓度为3.0×10?4 mol/L时，霓石回收率仅为25.32%，同时人工混合矿浮选泡沫产品中铁品位由34.20%降低至28.71%，回收率由33.29%降低至18.35%。pH=3~11时，铁离子以荷正电的羟基络合物沉淀形式吸附在霓石表面，增大了霓石的亲水性，降低了霓石的可浮性，铁离子在霓石表面吸附使霓石零电点由2.14增至6.70，表面正电性增大减弱了阳离子捕收剂DDA与霓石表面的静电吸附，使霓石界面层内的RNH3+浓度小于界面层外，DDA吸附层松散程度增大，霓石(110)面法线方向DDA浓度分布向正方向偏移，造成霓石可浮性下降。

关键词: 铁离子, 霓石, 镜铁矿, 抑制, 十二胺

Abstract: Flotation behavior of aegirite was investigated by single mineral flotation tests at different pH values and Fe3+ concentrations which dodecylamine (DDA) was used as the collector. The effect of iron ion on the separation behavior of aegirite and specularite was studied by using artificial mixed minerals flotation. Zeta potential measurement, hydrolysis component concentration calculation of iron ion, Boltzmann theory analysis, and molecular dynamics simulation were conducted to study the depression mechanism of iron ions on aegirite in dodecylamine system. The results indicated that iron ions could depress aegirite in great extent. When the initial pH value was 6.8, and concentration of collector dodecylamine was 3.6×10?4 mol/L, the recovery rate of aegirite was 75.72%, while the recovery rate decreased to 25.32% with 3.0×10?4 mol/L iron ions in the pulp. The iron grade of froth product of artificial mixed minerals flotation decreased from 34.20% to 28.71%, while the recovery rate of iron declined from 33.29% to 18.35%. Iron ions adsorbed on the surface of aegirite in the form of hydrophilic hydroxyl complexes precipitates in the experiment range pH=3?11, which increased the hydrophilicity of aegirite and decreased its floatability. The adsorption of iron ion on aegirite surface shifted the point of zero charge from 2.14 to 6.70, which increased the surface electropositivity of aegirite and weakens the electrostatic adsorption between dodecylamine and aegirite, leading to the decrease of the RNH3+ concentration in interfacial layer of aegirite. The existence of iron ions resulted in the looser structure of the DDA adsorption layer and the shift of DDA concentration profile in the normal direction of aegirite (110) surface to the positive direction which decreased the floatability of aegirite. The results of the research improved better understanding of the role of metal ion in mineral flotation.

Key words: iron ion, aegirite, speculatite, depression, dodecylamine

李明阳皇甫明柱胡义明刘军高翔鹏刘文宝. 十二胺体系中铁离子对霓石浮选的影响及其作用机理[J]. 过程工程学报, 2019, 19(5): 1014-1021.

Mingyang LI Mingzhu HUANGFU Yiming HU Jun LIU Xiangpeng GAO Wenbao LIU. The effect and mechanism of iron ion on flotation of aegirite in dodecylamine system[J]. Chin. J. Process Eng., 2019, 19(5): 1014-1021.

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十二胺体系中铁离子对霓石浮选的影响及其作用机理

The effect and mechanism of iron ion on flotation of aegirite in dodecylamine system

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