Minerals
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2022
·Vol. 12
·期 9
·1068
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IF 2.818
Yangshuai Qiu,Zhenfei Mao,Kangkang Sun,Lingyan Zhang,Yupeng Qian,Tao Lei,Wenbo Liang,Yaxin An
Flotation is one of the most used methods to upgrade natural graphite resources. However, the efficiency is usually decreased due to the entrainment of undesirable fine gangue minerals. In this work, the impact of different factors such as particle size, pulp density, and flotation reagent on the entrainment of mica and quartz in a flake graphite flotation was studied. The single gangue mineral flotation results showed increased gangue entrainment when reducing the particle size of gangue minerals and increasing the pulp density. Moreover, the flotation of artificial mixtures indicated enhanced entrainment of mica and quartz in the presence of graphite particles. The collector and frother also strongly affect gangue entrainment by modifying the structure and stability of the froth. Kerosene, which has a prominent deforming feature, can reduce gangue entrainment more effectively than diesel.Keywords:entrainment;froth flotation;quartz;mica;flake graphite
研究领域:
矿物加工
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材料科学
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
·
IF 2.888
Tao Zhang,Ao Li,Xin Xu,Yixin Ma,Dongmei Xu,Lianzheng Zhang,Jun Gao,Yinglong Wang
Acetone and n -heptane are widely applied in pharmaceutical industry as benign solvents and are observed in the wastewater. Because acetone and n -hexane can form an azeotropic mixture, it is impossible to recover acetone and n -heptane with high purity from the wastewater using conventional distillation. In this research, for separating the azeotrope (acetone + n -heptane) by homogeneous extractive distillation, 1-chlorobutane and butyl propanoate were chosen as the intermediate and heavy boiling entrainers. The isobaric vapour-liquid equilibrium (VLE) behaviour for the three binary systems (acetone + 1-chlorobutane), (butyl propanoate + acetone) and ( n -heptane + butyl propanoate) were reported at 101.3 kPa. The values of the excess Gibbs energy ( G E ) were calculated to explore the nonideal of the systems. The thermodynamic consistency of the determined VLE values was checked by the van Ness and Herington tests. In addition, the determined VLE data were fitted by the UNIQUAC, Wilson, and NRTL models. The parameters of those models were regressed, which are helpful for simulating the separation process with the intermediate and heavy boiling entrainers by extractive distillation.
研究领域:
化学工程
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热力学
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分离过程
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高影响因子
Minerals
·
2015
·Vol. 5
·期 4
·654-664
·
IF 1
Wei Ge,Hongqiang Li,Yanzeng Ren,Feiyu Zhao,Shaoxian Song
The hydrophilic flocculation of pyrite fines in aqueous suspensions with corn starch was studied by measuring particle size distribution, microscopy observation and micro-flotation. Furthermore, the interaction of corn starch with pyrite was investigated by determining the adsorption density and based on zeta potential measurements and X-ray photoelectron spectrometer (XPS) analysis in this work. The results of the particle size distribution measurement show that corn starch can effectively aggregate pyrite fines, and the pyrite floccules (flocs) are sensitive to mechanical stirring. The micro-flotation results suggest that the mechanical entrainment of pyrite fines in flotation can be effectively eliminated through the formation of large-size flocs. The zeta potential of pyrite particles decreases with the addition of corn starch. The XPS results prove that carboxyl groups are generated on the digested corn starch, and both iron hydroxyl compounds and ferrous disulfide on the pyrite surface can chemically interact with the corn starch digested by sodium hydroxide.Keywords:hydrophilic flocculation;pyrite fines;corn starch;mechanical entrainment;adsorption
研究领域:
矿物加工工程
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界面化学
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xian Xie,Huxiao Xia,Changtao Wang,Xiong Tong,Chuandong Zhao
The entrainment of Mg-containing chlorite usually occurs during marmatite flotation, which further deteriorates the smelting of zinc concentrate. In this study, the flotation behavior of marmatite and chlorite were investigated, which disclosed that fine-grained chlorite was more floatable and easily entered into zinc concentrate than coarse-grained chlorite. The combined water glass (AWG) and sodium citrate (SC) has been confirmed excellent chlorite depressant, which could decrease the grade of MgO from 3.45 % to 0.31 % in zinc concentrate. XPS and reagent adsorption analysis uncovered that Cu 2+ would not adhere and induce collector ML-8 attach to chlorite surface, meaning the entrainment of chlorite was not caused by activation flotation. The moisture of foam for fine-grained chlorite flotation is much higher than of marmatite, confirming that foam for chlorite flotation is not mineralized, and the collection of chlorites was caused by foam entrainment. Moreover, AWG and SC could selectively adsorb on the chlorite surface and reduce its contact angle to 16.85°. Eventually, SEM-EDS detection further revealed that the entrainment of fine-grained chlorite in zinc concentrate was almost disappeared after using the combined AWG and SC to increase the surface wettability of chlorite. The actual ore flotation further confirmed its excellent inhibitory effect on selectivity.
研究领域:
矿物加工
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浮选化学
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表面化学
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提取冶金学
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2019
·
IF 2.29
Kai Liu,Zhaojie Wang,Yi Zhang,Dongmei Xu,Jun Gao,Zhun Ma,Yinglong Wang
Dimethyl carbonate and ethanol can form an azeotrope with the minimum boiling point. To separate the azeotrope (dimethyl carbonate + ethanol) by extractive distillation , p -xylene, butyl propionate , and isobutyl acetate were chosen as entrainers , and the isobaric vapour-liquid equilibrium (VLE) data for the binary systems of (dimethyl carbonate + p -xylene), (dimethyl carbonate + butyl propionate), (dimethyl carbonate + isobutyl acetate) and (ethanol + isobutyl acetate) were measured at 101.3 kPa using a modified Rose type recirculating still. The thermodynamic consistency of the VLE experimental data for the four binary mixtures was tested by the Herington and van Ness methods. Furthermore, the measured VLE data were correlated by the NRTL, UNIQUAC and Wilson thermodynamic models and the binary interaction parameters of the three models were regressed. Based above, an extractive distillation process with the entrainer of p -xylene was proposed and simulated to separate the azeotrope (dimethyl carbonate + ethanol).
研究领域:
化学工程
·
热力学
·
分离过程
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DOI
高影响因子
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