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| 1 | Effect of different concentrations of surfactant on the wettability of coal by molecular dynamics simulation显示文摘Anionic surfactant sodium dodecyl benzene sulfonate(SDBS)at varying concentrations was selected to investigate the influence on the wettability of Zhaozhuang Coal by molecular dynamics simulation.Six groups of water/surfactant/coal systems with different concentrations were constructed.The influence of surfactant with different concentrations on the wettability of coal was concluded by analyzing various properties from the energetic behaviors to the dynamic characteristics.The results show that the interfacial tension decreases sharply and then rises slowly with the increase of SDBS surfactant concentration,obtaining that surfactants can obviously reduce the interfacial tension.The surfactant molecules could be detected at the water/coal interface through analyzing the system’s relative concentration distribution.In addition,the difference in the wettability of surfactants on coal surfaces is caused by the spatial distribution differences of alkyl chains and the benzene ring of the surfactant molecules.And the negative interaction energy between SDBS and the coal surface indicates that adsorption process is spontaneous.Furthermore,it is of great practical significance for improving the dust reduction effect and reducing the disaster of coal dust by exploring the effects of surfactant molecules on the wettability of coal. | Junqing Meng Feifei Yin Shichao Li Ruquan Zhong Zeyuan Sheng Baisheng Nie | 2019 | International Journal of Mining Science and Technology2019，29，4： | 20 |
| 2 | 微细高岭石颗粒表面水化作用机理研究显示文摘为掌握微细高岭石颗粒表面水化作用机理,利用流变仪测定了微细高岭石在不同离子溶液中分散体系的黏度.基于爱因斯坦黏度方程,建立了矿物颗粒表面水化度测定方法,分析了Na+,K+,Ca2+,Mg2+等离子对高岭石颗粒表面水化度的影响规律.结果表明:高岭石颗粒表面水化度在去离子水中为131.895,在浓度为0.001,0.010,0.100mol/L不同离子溶液中分别为NaCl溶液中的160.714,123.397,109.834,KCl溶液中的141.761,106.171,93.071,CaCl_2溶液中的118.854,93.141,86.800和MgCl2溶液中的95.195,82.764,57.234,水化度随溶液中离子浓度的增加而逐渐减小,浓度较低时Na^+,K^+离子有利于水化膜的形成,颗粒表面水化度最高;煤泥水中常见阳离子对高岭石颗粒表面水化膜的弱化能力依次为:Na^+ | 刘令云 陆芳琴 闵凡飞 张明旭 | 2016 | 中国矿业大学学报2016，45，4： | 11 |
| 3 | 硫化型金矿浮选技术研究现状及进展显示文摘概述了硫化型金矿浮选技术的主要研究进展,分析了硫化型金矿常用浮选工艺的特点、优点及适用范围,从浮选电化学、分子动力学的角度对硫化型金矿浮选理论研究进展进行了总结,同时对硫化型金矿浮选捕收剂、有机和无机抑制剂、活化剂的主要研究进展以及黏土矿物对硫化型金矿石浮选的影响研究成果进行了介绍,并且对硫化型金矿浮选技术未来的研究重点和发展方向进行了展望。 | 王振 邹旦 赵开乐 Safarov Sayfidin | 2022 | 化工矿物与加工2022，51，6： | 7 |
| 4 | Effect of butanol on flotation separation of quartz from hematite with N-dodecyl ethylenediamine显示文摘In order to investigate the effect of butanol on quartz flotation when N-dodecyl ethylenediamine(ND)was used as collector, single mineral flotation and artificial mixed mineral(hematite and quartz were mixed at a mass ratio of 3:2) separation were conducted in the laboratory. Experimental results indicated that addition of butanol could improve the collecting performance of ND on quartz and enhance the floatability of quartz. Best flotation recovery of quartz was obtained when butanol was mixed with ND at a mass ratio of 1:1. Moreover, the molecular structure of alcohols had a significant effect on mineral recovery. Best separation efficiency could be obtained when tert-butanol was added as it had the largest cross-sectional area. Zeta potential measurements indicated that alcohols could strengthen electrostatic adsorption between quartz and collector. Molecular dynamic simulations revealed that co-adsorption of alcohols along with ND had taken place on the quartz surface, and ND/tert-butyl combinations were more easily absorbed on the quartz surface. | Liu Wengang Liu Wenbao Wang Xinyang Wei Dezhou Zhang Hao Liu Wei | 2016 | International Journal of Mining Science and Technology2016，26，6： | 7 |
| 5 | Mechanism study on flotation separation of molybdenite from chalcocite using thioglycollic acid as depressant显示文摘Effects of collectors(butyl xanthate(BX), O-isopropyl-N-sulfur ethyl carbamate(Z-200) and emulsified kerosene), dereagent(sodium sulfide) and depressant thioglycollic acid(TGA) on the flotation of chalcocite and molybdenite were investigated through flotation. The first principle theory was adopted to understand the difference of their surfaces and reaction between minerals and reagents. Results of flotation tests revealed that selectivity of emulsified kerosene is the best of three collectors in separation of chalcocite and molybdenite, though the others also display excellent collecting properties. Sodium sulfide can effectively remove collectors adsorbed on chalcocite surface, and TGA is an effective depressant of chalcocite at pH 8-9. Through first principle study, molybdenite displays relatively stronger covalence property while bonding interaction between copper atoms in chalcocite enhanced its ionicity. Bonding interaction is weaker in reaction of TGA and molybdenite, so it shows higher hydrophobicity and better flotability. Therefore, TGA is an effective inhibitor in the separation. | Qin Wenqing Wu Jiajia Jiao Fen Zeng Jinming | 2017 | International Journal of Mining Science and Technology2017，27，6： | 5 |
| 6 | 方铅矿与脆硫锑铅矿在高碱体系中的浮选电化学行为(英文)显示文摘为有效分离方铅矿和脆硫锑铅矿并提高其在混合浮选中的回收率,研究两者与乙硫氮捕收剂(DDTC)的作用机理。通过单矿物浮选实验研究矿浆p H值对两者浮选行为的影响。通过循环伏安法和塔菲尔曲线测试研究两者与乙硫氮作用的电化学性质。浮选实验结果表明,在高碱体系中脆硫锑铅矿被石灰强烈抑制。循环伏安曲线和塔菲尔曲线表明,乙硫氮与方铅矿和脆硫锑铅矿的作用是电化学过程。高碱体系对方铅矿与乙硫氮的作用影响不大,但是对脆硫锑铅矿影响很大,这是其自身氧化以及OH-和Ca OH+等离子的特性吸附,导致非电活性的羟基化合物和低导电性的钙系化合物附着在其表面,阻碍电子在电极表面的传递,从而使脆硫锑铅矿的可浮性降低。 | 孙伟 孙晨 刘润清 曹学锋 陶红标 | 2016 | Transactions of Nonferrous Metals Society of China2016，26，2： | 1 |
| 7 | Removal and utilization of calcite existed in scheelite by preparation of calcium sulfate whiskers显示文摘In order to eliminate the effect of calcite associated with scheelite on the scheelite flotation, hydrochloric acid was used to dissolve the calcite, and the soaking solution was used to prepare CaSO_4 whiskers by hydrothermal reaction with sulfuric acid at ambient pressure. First, the condition experiments of preparing CaSO_4 whiskers by using CaCl_2 and H_2SO_4 were carried out to optimize reaction parameters of the crystallization process. The optimal conditions were: at 102 ℃ reaction temperature, 0,5 mol/L reactant concentration and 60 min reaction time. Then based on the condition experiments and considering keeping acid concentration stable for achieving HCl recycling, Calcium sulfate whiskers with the average diameter of 1.41 μm and the average aspect ratio of 109 were prepared by the soaking solution after evaporating to half of its volume and 1.0 mol/L H_2SO_4 at 102 ℃ for 60 min: After ion exchange processing,the filtrate could be used as HCl in the process of HCl dissolution. | Guan Qingjun Sun Wei Hu Yuehua Guan Changping Yin Zhigang Zhang Chenhu | 2017 | International Journal of Mining Science and Technology2017，27，6： | 0 |
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