ZHAO Wei;QU Jinzhou;LI Zhen;YANG Zhiyuan;ZHOU Anning;

• 1:College of Chemistry & Chemical Engineering
• 2:Xi'an University of Science and Technology
• 3:Key Laboratory of Coal Resources Exploration and Comprehensive Utilization
• 4:Ministry of Land and Resources

Abstract：

The separation of coal macerals was studied by an electroflotation-electrocoagulation method.The effect of the pH of pulp,voltage intensity,flotation time,pulp concentration and electrocoagulation on separation was investigated.Separation effect was evaluated by the enrichment and recovery rate of the coal vitrinite and inertinite.The results indicate that the pH of pulp,the voltage,flotation time and pulp density can be controlled to adjuste the rate of flotation recovery and enrichment of coal macerals.The flotation separation of coal macerals can be intensified effectively with the electrocoagulation.The effect of the electrocoagulation is controlled by the concentration of aluminum ion in the reaction process,and the higher the concentration of aluminum ions is,the faster the formation rate of flocculation will be.The adjustment of the electrochemical reaction rate of the anode can change the aluminum concentration and its hydrolysis form in the solution and control the effect of flotation separation.

Key Words： electroflotation;electrocoagulation;coal maceral;influencing factor

Abstract:

Keywords:

Foundation: 陕西省自然科学基金资助项目(2017JM5002);; 国家自然科学基金资助项目(51674194)

Authors: ZHAO Wei;QU Jinzhou;LI Zhen;YANG Zhiyuan;ZHOU Anning;

DOI: 10.13226/j.issn.1006-6772.2018.01.010

References：

• [1]吴春来.21世纪我国煤炭综合利用趋势浅析[J].煤化工,2000(4):3-5.WU Chunlai.Trends analysis of coal comprehensive utilization in the 21stCentury in China[J].Coal Chemical Industry,2000(4):3-5.
• [2]韩德馨.中国煤岩学[M].徐州:中国矿业大学出版社,1996.
• [3]李文华,陈亚飞,陈文敏,等.中国主要矿区煤的显微组分分布特征[J].煤炭科学技术,2000,28(9):31-34.LI Wenhua,CHEN Yafei,CHEN Wenmin,et al.Distribution features of micro-constituents for coal in China main mining area[J].Coal Science and Technoloty,2000,28(9):31-34.
• [4]HELLE S,GORDON A,ALFARO G,et al.Functional group and individual maceral chemistry of high volatile bituminous coals from southern Indiana:Controls on coking[J].Int.J.Coal Geol.,2004,58:181-191.
• [5]ZHAO Y,HU H,JIN L,et al.Pyrolysis behavior of vitrinite and inertinite from Chinese Pingshuo coal by TG-MS and in a fixed bed reactor[J].Fuel Process Technol,2011,92(4):780-786.
• [6]MALUMBAZO N,WAGNER N J,BUNT J R,et al.Structural analysis of chars generated from South African inertinite coals in a pipereactor combustion unit[J].Fuel Process Technol.,2011,92(4):743-749.
• [7]JIN L,HAN K,WANG J,et al.Direct liquefaction behaviors of Bulianta coal and its macerals[J].Fuel Process Technol.,2014,128:232-237.
• [8]赵伟,张晓欠,周安宁,等.神府煤煤岩显微组分的浮选分离及富集物的低温热解产物特性研究[J].燃料化学学报,2014,42(5):527-533.ZHAO Wei ZHANG Xiaoqian ZHOU Anning,et al.Flotation separ ation of Shenfu coal macerals and low temperaturep yrolys is characteristics of different maceral concentrate[J].Journal of Fuel Chemistry and Technology,2014,42(5):527-533.
• [9]ROBERTS M J,EVERSON R C,NEOMAGUS HWJP,et al.Influence of maceral composition on the structure,properties and behaviour of chars derived from South African Coals[J].Fuel,2015,142:9-20.
• [10]SHU X,WANG Z,XU J.Separation and preparation of macerals in Shenfu coals by flotation[J].Fuel,2002,81:495-501.
• [11]林治穆.煤显微组分的浮选法分离及富集物的热转化特性[J].山东矿业学院学报,1990,9(1):74.
• [12]FECKO P,PECTOVA I,OVCARI P,et al.Influence of petrographical composition on coal flotability[J].Fuel,2005,84(14-15):1901-1904.
• [13]JORJANI E,ESMAEILI S,KHORAMI M T.The effect of particle size on coal maceral group's separation using flotation[J].Fuel,2013,114:10-15.
• [14]ZHAO W,YANG F,LI Y,et al.Influence of microwave treatment under a hydrogen or methane atmosphere on the flotability of the macerals in Shenfu coals[J].Min.Sci.Techol.,2011,21(6):761-766.
• [15]宋强.低阶煤显微组分浮选分离试验研究[D].呼和浩特:内蒙古科技大学,2015.
• [16]HONAKER R Q,MOHANTY M K,CRELLING J C.Coal maceral separation using column flotation[J].Minerals Engineering,1996,9(4):449-464.
• [17]HOWER J C,KUEHN K W,PAREKH B K,et al.Macerals and microlithotype beneficiation in column flotation at the Powell Mountain Coal Mayflower Preparation Plant,Lee County,Virginia[J].Fuel Process Technol.,2000,67:23-33.
• [18]BARRAZA J,PINERES J.A pilot-scale flotation column to produce beneficiated coal fractions having high concentration of vitrinite maceral[J].Fuel,2005,84:1879-1883.
• [19]OZYONAR F,KARAGOZOGLU B.Treatment of pretreated coke wastewater by electrocoagulation and electrochemical peroxidation processes[J].Sep.Purif.Technol.,2015,150:268-277.
• [20]GRAEME J M,JACK L,ARSHAD A,et al.Evaluation of electrocoagulation for the pre-treatment of coal seam water[J].J.Water Process Eng.,2014,4:166-178.
• [21]赵伟,周安宁,李远刚.微波辅助磨矿对煤岩组分解离的影响[J].煤炭学报,2011,36(1):140-144.ZHAO Wei,ZHOU Anning,LI Yuangang.The influence of microwave-assisted grinding on coal macerals disdociation[J].Journal of China Coal Society,2011,36(1):140-144.
• [22]赵伟,杨志远,李振,等.电化学处理对神木煤显微组分表面结构及可浮性的影响研究[J].燃料化学学报,2017,45(4):400-407.ZHAO Wei,YANG Zhiyuan,LI Zhen,et al.Influence of electrochemical treatment on surface structure and flotability of Shenmu coal macerals[J].Journal of Fuel Chemistry and Technology,2017,45(4):400-407.
• [23]VU T P,VOGEL A,KERN F,et al.Characteristics of an electrocoagulation-electroflotation process in separating powdered activated carbon from urban wasterwater effluent[J].Separation and Purification Technology,2014,134:196-203.