Insight into the physical assembly of alkanes with Z-200 molecules on surface hydrophobicity of chalcopyrite (CuFeS2)

IF 5.7 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Zerui Liu , Yao Feng , Xiaoqin Tang , Yuqiong Li , Di Wu , Jianhua Chen , Ye Chen
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Abstract

Copper flotation usually utilizes the synergistic effect between different collectors to improve the recovery. Currently, there are few studies on the assembly of nonpolar alkanes with collectors for flotation practice, not to mention the lack of micro-mechanism studies. In this study, the effect of the physical assembly of alkanes with Z-200 on the surface hydrophobicity of chalcopyrite was systematically investigated by flotation, contact angle and microcalorimetric tests, density functional theory and molecular dynamics calculations. It was found that the assembled reagents exhibited better collection ability towards chalcopyrite than Z-200, required lower dosages and exhibited higher recoveries. The assembled reagents made chalcopyrite surface more hydrophobic. The adsorption of assembled reagents on chalcopyrite surface was much more intense than that of the single reagent. Alkanes could not spontaneously adsorb on chalcopyrite surface, and after assembly, alkanes were assembled with chemisorbed Z-200 by van der Waals forces and co-adsorbed on the mineral surface. The assembled reagents were tightly arranged and more hydrophobic than the hydrophobic layer with only Z-200 adsorbed. The study revealed the assembly mechanism between Z-200 and alkanes at the solid-liquid interface of flotation, which provided a theoretical basis for the development and design of novel collectors for mixed sulfide ores.

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来源期刊
Surfaces and Interfaces
Surfaces and Interfaces Chemistry-General Chemistry
CiteScore
8.50
自引率
6.50%
发文量
753
审稿时长
35 days
期刊介绍: The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)
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