高硫煤电化学调浆浮选脱硫研究
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摘要
本文系统地对山东兖州、淄博、内蒙乌达高硫煤中黄铁矿的形态、嵌布及粒度特征进行了研究。并首次运用TEM研究了煤粒中微米级黄铁矿，指出了煤的难选性，并对其可选性进行了评价。
本文将电化学调浆技术运用于高硫煤浮选脱硫研究，探讨了矿浆Eh与PH值的变化与煤系黄铁矿可浮性的关系。首次进行了这三种高硫煤的电化学调浆还原的研究，考察了电解电位、电解时间、电解质浓度、介质pH值等对脱硫率的影响。研究表明，电化学浮选脱硫率随电解电压、电解时间、介质pH值呈规律性变化。
本文运用XRD研究了细粒煤电化学该性前后的矿物变化。研究证实了煤系黄铁矿表面易氧化的事实，其氧化产物为多硫化铁。表明了通过电化学还原可以强化浮选脱硫。并运用XPS、FTIR研究了细粒煤电化学还原表面改性的反应机理，证实经过电化学还原煤系黄铁矿被还原，亲水性增强；同时煤的含氧官能团还原，憎水性加强，浮选脱硫率提高。以上分析得出，电化学调浆浮选脱硫是一种先进的、有效的、温和的脱硫新方法，有待于进一步的研究并开发运用。
In this work, the features of shape .distribution characteristic of dissemination and size of coal pyrites in Yanzhou ,Zibo ,Wuda coal were studied systematically from both microscopic and macroscopic aspects. Micron pyrites in high sulfur coal was investigated by transmission electron microanalyser for the first time , indicating that the finely disseminated pyrites sulfur removal from coal is difficult and its washability is evaluated.In the study , an attempt was made to study the application of electrochemistry controlled reduction in desulfurization by flotation. The relationship between the pulp flotation and pulp potential and pulp pH values has been investigated. The influences of electrolysisvoltage ,time ,concentration of electrolyte and pulp pH value on electro-reduction desulfurization by flotation were systematically examined. The results indicated that a regularity change was presented and the best removal rate of total sulfur from coal was obtained.The surface compounds formed on the coal surface under different electrochemistry condition were identified with XRD spectrometric methods. The results showed that the surface oxidation of coal pyrite is easy. Iron polysulfide was found. Depending upon the electrochemistry reduction ,the removal rate of sulfur in flotation was enhanced. With the use of modern surface analytical methods, such as XPS and FTIR spectrum ,the fine coal desulfurization mechanisms of electro-reduction was examined. The experiment showed that polysulfied in pyrite surface was reducted, and oxygen-containing functional groups on the coal surface were hydrogenated, and then the floatability of coal was increased.As show above the electrochemistry reduction is a simple new method for suppressing pyrite with good economic benefits and no environment pollution.
本文将电化学调浆技术运用于高硫煤浮选脱硫研究，探讨了矿浆Eh与PH值的变化与煤系黄铁矿可浮性的关系。首次进行了这三种高硫煤的电化学调浆还原的研究，考察了电解电位、电解时间、电解质浓度、介质pH值等对脱硫率的影响。研究表明，电化学浮选脱硫率随电解电压、电解时间、介质pH值呈规律性变化。
本文运用XRD研究了细粒煤电化学该性前后的矿物变化。研究证实了煤系黄铁矿表面易氧化的事实，其氧化产物为多硫化铁。表明了通过电化学还原可以强化浮选脱硫。并运用XPS、FTIR研究了细粒煤电化学还原表面改性的反应机理，证实经过电化学还原煤系黄铁矿被还原，亲水性增强；同时煤的含氧官能团还原，憎水性加强，浮选脱硫率提高。以上分析得出，电化学调浆浮选脱硫是一种先进的、有效的、温和的脱硫新方法，有待于进一步的研究并开发运用。
In this work, the features of shape .distribution characteristic of dissemination and size of coal pyrites in Yanzhou ,Zibo ,Wuda coal were studied systematically from both microscopic and macroscopic aspects. Micron pyrites in high sulfur coal was investigated by transmission electron microanalyser for the first time , indicating that the finely disseminated pyrites sulfur removal from coal is difficult and its washability is evaluated.In the study , an attempt was made to study the application of electrochemistry controlled reduction in desulfurization by flotation. The relationship between the pulp flotation and pulp potential and pulp pH values has been investigated. The influences of electrolysisvoltage ,time ,concentration of electrolyte and pulp pH value on electro-reduction desulfurization by flotation were systematically examined. The results indicated that a regularity change was presented and the best removal rate of total sulfur from coal was obtained.The surface compounds formed on the coal surface under different electrochemistry condition were identified with XRD spectrometric methods. The results showed that the surface oxidation of coal pyrite is easy. Iron polysulfide was found. Depending upon the electrochemistry reduction ,the removal rate of sulfur in flotation was enhanced. With the use of modern surface analytical methods, such as XPS and FTIR spectrum ,the fine coal desulfurization mechanisms of electro-reduction was examined. The experiment showed that polysulfied in pyrite surface was reducted, and oxygen-containing functional groups on the coal surface were hydrogenated, and then the floatability of coal was increased.As show above the electrochemistry reduction is a simple new method for suppressing pyrite with good economic benefits and no environment pollution.
引文
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3．中煤选煤协会煤质选煤处，高硫煤调查报告(内部资料)，1995年12月．
4．孙成功，李保庆，煤净化技术的新进展—电化学制氢与煤的温和净化，煤炭转化，1992，15(3)，P6—5．
5. Shashi, B., Lalvani and Alan Weston, Fuel Processing Technology, 1989, 21,P117.
6. Steinberg, H. W., Deue Donne, C. L., Markby, R.E. and Wender I, Fuel, Lond, 1966, 45, P469.
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12. Katurki Kusukabe, Hiroshi Nishida, Shingeharu Movooka, Yasuo Kato, Koei, 1987, 66, P271。
13. P. G. Waper, S. B. Laveani, Fuel Processing Technology, 1988, 18, P25
14. Shashi B. Lavani and Mark Hines, Process, Util. High Sulfru coals, Proc. Int. Conf. 1987, 2, P282
15. Shashi, B., Lalvani and Alan Weston, Fuel Proeessing Technology, 1989, 21, P117
16．刘旭光，李静，考义煤电化学脱硫研究，燃料化学学报，1997，vol．25，No．2，P124-129．
17．刘旭光，李静，考义煤电化学脱硫研究，燃料化学学报，1997，vol25，No．3，P233-237．
18．刘旭光，李静，考义煤电化学脱硫研究，燃料化学学报，1997，，vol25，No．4，，P363-367．
19．刘冬梅，张敬东，天府煤的电化学脱硫研究，煤炭加工与综合利用1999，No．3，p19-21
20．易平贵，刘俊峰，水—有机溶剂混合体系中高硫煤电解脱硫的研究：洁净煤研究，1998，vol．4，No．4，P48-51．
21. Salamy, S.G., NiXon, J. G., The application of electrochemical Methods to flotation reserch. In:Recent Developments in mineral dressing, 1953, P503-516.
22. Salamy, S. G., Nixon JG. Reaction between a mercury surface and some floation reayents on electrochemical study, Aust.. J. Chem., 1954, 7. P146-157.
23. Chander S., Fuerstenau D. W., Electrochemical floation Seperation of chalcocite from molybdnite. Int. J. Miner Process, 1983, 10, P89-94.
24．冯其明，硫化矿浮选矿浆电化学理论及工艺研究，中南工业大学博士学位论文，1986年．
25．胡庆春，铅矿—毒砂浮选分离的电化学，中南工业大学硕士学位论文(选矿工程专业)，1988年．
26．崔章明，辉锑矿民毒砂无捕收剂浮选分离及其影响因素的研究，中南工业大学硕士学位论文(选矿工程专业)，1990年．
27. Buckley A. N., Woods R., The Surface oxidation of pyrite Applied surface science. 1987, 27, P437-452.
28. Xu Z., Yoon R. H., The role of Hydrophobic interactions in coagulation. Journal of Colloid and Interface Science, 1989, 134(2) P532-541.
29. Choudhry V., Aplan F. F., Pyrite Depressing During coal flotation Part I-inorganic Tons. Minerals and Metallurgical Processing, 1992, 5, P51-56.
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