Application of calcium hypochlorite and carboxymethyl chitosan as combined depressants for selective flotation separation of chalcopyrite from pyrite at low alkalinity

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL
Mingjun Chen , Yunxiao Bi , Zhan Ding , Jiaqiao Yuan , Anmei Yu , Li Chen , Shaojun Bai , Yingbo Mao
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Abstract

Flotation separation of copper-sulfur at low alkalinity has attracted soaring interest in the beneficiation of copper sulfide ore. In this work, application of calcium hypochlorite (Ca(ClO)2) and carboxymethyl chitosan (OCMC) as combined depressants for selective flotation separation of chalcopyrite from pyrite was investigated. A maximum recovery difference of 71.35 % between both minerals is observed under the recommended conditions ([Ca(ClO)2] = 60 mg/L, [OCMC] = 400 mg/L and 40 mg/L SBX at pH=8). Besides, the copper-sulfur flotation separation indexes were assessed by the artificial mixed-mineral tests. Results of contact angle measurement, zeta potential and adsorption amount analysis reveal that the combined depressants severely impede the collector adsorption onto pyrite surfaces, and has a light effect on the chalcopyrite. OCMC exhibits a stronger complexing ability on Ca2+ and Fe2+ ions than Cu2+ ions. XPS results confirm that the combined depressant interact with pyrite surfaces intensively, and prompt a deep conversion of S22- and Sn2-/S0 into S2- and SO42- species, as well as a deep transformation of Fe(II)-S into Fe(III)-O/OH on the pyrite surface. ToF-SIMS and thermodynamic calculation results afford the favorable evidence for the selective suppression of the pyrite with added the combined depressant. Thereby the selective oxidation and intense complexation on the pyrite stemming from the combined depressant synergy are responsible for the selective separation of chalcopyrite from pyrite.

Abstract Image

应用次氯酸钙和羧甲基壳聚糖作为联合抑制剂,在低碱度条件下从黄铁矿中选择性浮选分离黄铜矿
在硫化铜矿选矿过程中,低碱度铜硫浮选分离引起了人们的极大兴趣。在这项工作中,研究了次氯酸钙(Ca(ClO)2)和羧甲基壳聚糖(OCMC)作为联合抑制剂从黄铁矿中选择性浮选分离黄铜矿的应用。在推荐条件下([Ca(ClO)2] = 60 mg/L,[OCMC] = 400 mg/L,40 mg/L SBX,pH=8),两种矿物的最大回收率相差 71.35%。此外,还通过人工混合矿物试验评估了铜硫浮选分离指标。接触角测量、ZETA电位和吸附量分析结果表明,联合抑制剂严重阻碍了黄铁矿表面对捕收剂的吸附,对黄铜矿的影响较轻。OCMC 对 Ca2+ 和 Fe2+ 离子的络合能力强于 Cu2+ 离子。XPS 结果证实,联合抑制剂与黄铁矿表面的相互作用十分强烈,促使黄铁矿表面的 S22- 和 Sn2-/S0 深度转化为 S2- 和 SO42- 物种,以及 Fe(II)-S 深度转化为 Fe(III)-O/OH 物种。ToF-SIMS 和热力学计算结果为添加联合抑制剂后黄铁矿的选择性抑制提供了有利证据。因此,联合抑制剂协同作用在黄铁矿上产生的选择性氧化和强烈络合作用是黄铜矿与黄铁矿选择性分离的原因。
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来源期刊
Advanced Powder Technology
Advanced Powder Technology 工程技术-工程:化工
CiteScore
9.50
自引率
7.70%
发文量
424
审稿时长
55 days
期刊介绍: The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)
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上海源叶 O-Carboxymethyl Chitosan
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