聚合氯化铝对煤泥浮选的影响研究

doi:10.11799/ce20191032

摘要/Abstract

摘要： 为探究不同浓度聚合氯化铝(PAC)对煤泥浮选的影响，将250～125μm的煤炭与-100μm的高岭石混合进行浮选速率试验，结果表明加入少量PAC能降低水回收率、脉石回收率和夹带指数，同时可燃体回收率少量增加|当PAC量达到50mg/L时，夹带指数增加的同时浮选速率与可燃体回收率也显著增加，三个浮选评价指标(EI、SER、SI)显示，当PAC浓度为20mg/L时，浮选效果达到最佳|采用不同浓度的聚合氯化铝对高岭石进行凝聚试验，用聚焦式光散射测量仪(FBRM)在线测量其粒度变化，结果表明，随着PAC浓度的升高，高岭石的粒度先增大后减小，在PAC浓度为20mg/L时达到最大|利用不同浓度的聚合氯化铝与煤炭作用之后测定不同接触时间下的气泡-颗粒粘附概率，从而探究聚合氯化铝对煤炭疏水性的影响，试验结果说明PAC降低了煤炭颗粒的疏水性，与浮选速率降低的结果一致，同时浮选结果显示疏水性的降低并没有对最终可燃体回收率产生负面影响。

关键词: 煤, 高岭石, 浮选, 聚合氯化铝, 夹带

Abstract: Abstract: To explore the effect of polyaluminum chloride (PAC) of different concentrations in coal flotation, flotation rate experiments were conducted with the mixture of coal (250-125 μm) and kaolinite(- 100 μm). Water recovery, gangue recovery, entrainment index, Efficiency Index (EI), Separation Efficiency Rate (SER), and Se-lectivity Index (SI) were used to evaluate flotation performance. The experimental results show that the addition of PAC can reduce water recovery, gangue recovery and entrainment index. The three flotation evaluation indexes (EI, SER, and SI) showed that the optimum flotation efficiency was obtained when the PAC concentration was 20mg/L. PAC of different concentrations was used to agglomerate kaolinite, and the unweighted chord length distribution of kaolinite suspensions was measured by the Focused Beam Reflectance Measurement (FBRM). FBRM measurements showed that with the increase of PAC concentration, the chord length distributions of kaolinite increased first reaching the peak at 20 mg/L and then decreased. Bubble-particle attachment probability measurements were car-ried out with the coal which was interacted with PAC of different concentrations. The bubble-particle attachment probability measurements showed that PAC reduced the hydrophobicity of coal particles, which matched well with the reduction of flotation rate.

中图分类号:

TD94

田枫, 梁龙, 彭耀丽. 聚合氯化铝对煤泥浮选的影响研究[J]. 煤炭工程, 2019, 51(10): 143-147.

参考文献

[1]倪超.柱浮选精煤细泥污染形成机理及抑制研究[D]. 徐州：中国矿业大学，2016.
[2]谢广元, 吴玲, 欧泽深, 等.煤泥分级浮选工艺的研究[J].中国矿业大学学报, 2005, 34(6):78-82
[3]徐初阳, 聂容春, 张明旭, 等.煤泥浮选中抑制剂的应用研究[J].矿冶工程, 2005, 25(2):34-35
[4]Mulleneers, H.A.E.,LKKoopal,H. Bruning,et al. Selective separation of fine particles by a new flotation approach[J].Separation Science And Technology, 2002, 37(9):2097-2112
[5]Akdemir, U.T. Guler,and GYildiztekinFlotation and entrainment behavior of minerals in talc-calcite separation[J].Scandinavian Journal Of Metallurgy, 2005, 34(4):241-244
[6]Kirjavainen, V.M. Review and analysis of factors controlling the mechanical flotation of gangue minerals[J].International journal of mineral processing, 1996, 46(1-2):21-34
[7]郭德.细泥对浮选的影响及解决方案[J]. [J].煤炭工程,, 2003,, (（01）):11-12
[8]于宇, 朱铎, 朱金波, 等.浮选入料脱泥池在潘一矿选煤厂的应用研究[J][J].选煤技术, 2013, (01):45-48
[9]Cao, M.and QLiuReexamining the functions of zinc sulfate as a selective depressant in differential sulfide flotation-The role of coagulation[J].Journal Of Colloid And Interface Science, 2006, 301(2):523-531
[10]Wang, K., L. Wang, M. Cao, et al. Xanthation-modified polyacrylamide and spectroscopic investigation of its adsorption onto mineral surfaces[J]. [J].Minerals Engineering, 2012, , (39):1-8
[11]Polat, M.H. Polat,and SChanderPhysical and chemical interactions in coal flotation[J].International Journal Of Mineral Processing, 2003, 72(1-4):199-213
[12]Ding, K.J. and JSLaskowski. Coal reverse flotation. Part I: Separation of a mixture of subbituminous coal and gangue minerals[J].Minerals Engineering, 2006, 19(1):72-78
[13]王冉, 粘土泥化抑制对煤泥浮选的影响[D].徐州：中国矿业大学，2015.
[14]Park, H., J. Wang, and L. Wang. A comparative study of methyl cyclohexanemethanol and methyl isobutyl carbinol as frother for coal flotation[J][J].. International Journal of Mineral Processing,, 2016,, ( 155):32-44
[15]Bhattacharya S and D.S. An operator friendly performance index for frother selection and optimization in coal flotation[C]. Proceedings of the XVI Inter-national Coal Preparation Congress, ed. R. Honaker. 2010: 432-440
[16]梁龙.煤泥中粘土矿物的选择性团聚机理研究[D].徐州：中国矿业大学, 2017.
[17]Vanangamudi, M.K.JPillai,and TC. Rao. Effect of some operating variables on the efficiency index of a coal flotation operation[J].International Journal of Mineral Processing, 1981, 8(1):1-7
[18]Sripriya, R.P.VTRao,and B.R. Choudhury. Optimisation of operating variables of fine coal flotation using a combination of modified flotation parameters and statistical techniques[J].International Journal Of Mineral Processing, 2003, 68(1-4):109-127
[19]李洪强, 冯其明, 欧乐明, 等.利用聚合氯化铝降低隐石墨浮选过程中绢云母脉石的夹带[J].中南大学学报自然科学版, 2015, 46(11):3975-3982
[20]赫文振, 谢广元, 彭耀丽, 等.聚合氯化铝对煤泥浮选过程中细泥夹带的影响[J].煤炭技术, 2018, 37(06):306-309
[21]Liang, L., Z. Li, Y. Peng, et al. Influence of coal particles on froth stability and flotation performance[J]. [J].Minerals Engineering, 2015, (81):96-102