稳态浓密机全尾砂脱水规律物理模拟
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摘要
结合沉降和压滤实验研究浓密机内全压力范围下尾砂脱水性能,考察网状结构形成体积分数、压缩屈服应力、干涉沉降系数等参数的变化规律。结果表明:网状结构形成体积分数随絮凝剂单耗增加先升高后降低,单耗20 g/t时网状结构形成体积分数达到最大值;压缩屈服应力随体积分数变化呈幂和指数增长,在低压力区域,絮凝剂单耗对底流体积分数影响较大,在高压力区域,絮凝剂作用逐渐弱化;干涉沉降系数随体积分数变化呈幂增长,在低压力区域,絮凝剂单耗对料浆渗透性影响较大,单耗80 g/t时渗透性良好,在高压力区域,絮凝剂单耗对料浆渗透性影响逐渐弱化。实验范围内,膏体料浆存在脱水拐点,其体积分数为38%～42%。
The dewaterability of tailings was investigated under the condition of all pressure zone in thickener by combining settling and filtration experiments. The dewatering parameters, such as gel point, compressive yield stress and hindered settling function, were statistically calculated. The results indicate that the gel point increases firstly and then decreases with flocculant dosage increasing, the maximum value of gel point is obtained at dosage of20 g/t. The compressive yield stress increases combining power function and exponential function with the concentration.The flocculant dosage has a big effect on concentration at the low pressure zone relatively, and the effect decreases gradually at the high pressure zone. The hindered settling function grows with a power function of concentration. The flocculant dosage has a big effect on concentration at the low pressure zone relatively with obtaining the optimum permeability at the flocculant dosage of 80 g/t, and decreases gradually at the high pressure zone. An obvious turning point of volume fraction being from 38% to 42% is observed in the experiments.
The dewaterability of tailings was investigated under the condition of all pressure zone in thickener by combining settling and filtration experiments. The dewatering parameters, such as gel point, compressive yield stress and hindered settling function, were statistically calculated. The results indicate that the gel point increases firstly and then decreases with flocculant dosage increasing, the maximum value of gel point is obtained at dosage of20 g/t. The compressive yield stress increases combining power function and exponential function with the concentration.The flocculant dosage has a big effect on concentration at the low pressure zone relatively, and the effect decreases gradually at the high pressure zone. The hindered settling function grows with a power function of concentration. The flocculant dosage has a big effect on concentration at the low pressure zone relatively with obtaining the optimum permeability at the flocculant dosage of 80 g/t, and decreases gradually at the high pressure zone. An obvious turning point of volume fraction being from 38% to 42% is observed in the experiments.
引文
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[16]ZHANG Y,MARTIN A,GRASSIA P.Mathematical modelling of time-dependent densified thickeners[J].Chemical Engineering Science,2013,99:103-112.
[17]ZHANG Y,MARTIN A,GRASSIA P.Prediction of thickener performance with aggregate densification[J].Chemical Engineering Science,2013,101:346-358.
[18]USHER S P.Suspension dewatering:Characterisation and optimization[D].Melbourne:The University of Melbourne,2002:347.
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[21]LANDMAN K A,STANKOVICH J M,WHITE L R.The measurement of filtration diffusivity D(f)of a flocculated suspension[J].AIChE Journal,1999,45(9):1875-1882.
[22]LANDMAN K A,WHITE L R,BUSCALL R.The continuous flow gravity thickener:Steady state behavior[J].AIChE Journal,1988,34(2):239-252.
[2]李启月,刘恺,李夕兵.基于协同回采的深部厚大矿体分段充填采矿法[J].工程科学学报,2016,38(11):1515-1521.LI Qi-yue,LIU Kai,LI Xi-bing.Sublevel filling method for a heavy orebody in deep mining based on collaborative stoping[J].Chinese Journal of Engineering,2016,38(11):1515-1521.
[3]李公成,王洪江,吴爱祥,于少峰,陈辉,王晓宁,严庆文.基于倾斜管实验的膏体自流输送规律.中国有色金属学报,2014,24(12):3162-3168.LI Gong-cheng,WANG Hong-jiang,WU Ai-xiang,YUShao-feng,CHEN Hui,WANG Xiao-ning,YAN Qin-wen.Gravity transport law of paste based on inclined pipe experiment[J].The Chinese Journal of Nonferrous Metals,2014,24(12):3162-3168.
[4]吴爱祥,周靓,尹升华,王雷鸣.全尾砂絮凝沉降的影响因素[J].中国有色金属学报,2016,26(2):439-446.WU Ai-xiang,ZHOU Jing,YIN Sheng-hua,WANGLei-ming.Influence factors on flocculation sedimentation of unclassified tailings[J].The Chinese Journal of Nonferrous Metals,2016,26(2):439-446.
[5]王新民,柯愈贤,张钦礼,杨建.磁化处理全尾砂料浆沉降规律及其参数优化[J].中国矿业大学学报,2017,46(4):803-808.WANG Xin-ming,KE Yu-xian,ZHANG Qing-li,YANG Jian.Rule and optimum magnetization parameters of sedimentation of pre-magnetized crude tailings slurry[J].Journal of China University of Mining&Technology,2017,46(4):803-808.
[6]柯愈贤,王新民,张钦礼.全尾砂料浆磁化絮凝沉降特性[J].中国有色金属学报,2017,27(2):392-398.KE Yu-xian,WANG Xin-ming,ZHANG Qing-li.Flocculating sedimentation characteristic of pre-magnetized crude tailings slurry[J].The Chinese Journal of Nonferrous Metals,2017,27(2):392-398.
[7]王新民,赵建文,张德明.全尾砂絮凝沉降速度优化预测模型[J].中国有色金属学报,2015,25(3):793-798.WANG Xin-ming,ZHAO Jian-wen,ZHANG De-ming.Optimal prediction model of flocculating sedimentation velocity of unclassified tailings[J].The Chinese Journal of Nonferrous Metals,2015,25(3):392-398.
[8]焦华喆,吴爱祥,王洪江,刘晓辉,杨盛凯,肖云涛.全尾砂絮凝沉降特性实验研究[J].北京科技大学学报,2011,33(12):1437-1441.JIAO Hua-zhe,WU Ai-xiang,WANG Hong-jiang,LIUXiao-hui,YANG Sheng-kai,XIAO Yun-tao.Experiment study on the flocculation settlement characteristic of unclassified tailings[J].Journal of University of Science and Technology Beijing,2011,33(12):1437-1441.
[9]王洪江,陈琴瑞,吴爱祥,翟永刚,张新普.全尾砂浓密特性研究及其在浓密机设计中的应用[J].北京科技大学学报,2011,33(6):676-681.WANG Hong-jiang,CHEN Qin-rui,WU Ai-xiang,ZHAIYong-gang,ZHANG Xin-pu.Study on the thickening properties of unclassified tailings and its application to thickener design[J].Journal of University of Science and Technology Beijing,2011,33(6):676-681.
[10]吴爱祥,王洪江.金属矿膏体充填理论与技术[M].北京:科学出版社,2015:52.WU Ai-xiang,WANG Hong-jiang.The theory and technology of paste filling in metal mines[M].Beijing:Metallurgical Industry Press,2015:52.
[11]李辉,王洪江,吴爱祥,焦华喆,刘晓辉.基于尾砂沉降与流变特性的深锥浓密机压耙分析[J].北京科技大学学报,2013,35(12):1553-1558.LI Hui,WANG Hong-jiang,WU Ai-xiang,JIAO Hua-zhe,LIU Xiao-hui.Pressure rake analysis of deep cone thickeners based on tailings’settlement and rheological characteristics[J].Journal of University of Science and Technology Beijing,2013,35(12):1553-1558.
[12]BUSCALL R,WHITE L R.The consolidation of concentrated suspensions[J].Journal of Chemical Society,1987:873-891.
[13]USHER S P,SCALES P J.Steady state thickener modelling from the compressive yield stress and hindered settling function[J].Chemical Engineering Journal,2005,111(2/3):253-261.
[14]van DEVENTE B B G,USHER S P,KUMAR A,RUDMANM,SCALES P J.Aggregate densification and batch settling[J].Chemical Engineering Journal,2011,171(1):141-151.
[15]ZHANG Y,GRASSIA P,MARTIN A D,USHER S P,SCALES P J.Mathematical modelling of batch sedimentation subject to slow aggregate densification[J].Chemical Engineering Science,2015,128:54-63.
[16]ZHANG Y,MARTIN A,GRASSIA P.Mathematical modelling of time-dependent densified thickeners[J].Chemical Engineering Science,2013,99:103-112.
[17]ZHANG Y,MARTIN A,GRASSIA P.Prediction of thickener performance with aggregate densification[J].Chemical Engineering Science,2013,101:346-358.
[18]USHER S P.Suspension dewatering:Characterisation and optimization[D].Melbourne:The University of Melbourne,2002:347.
[19]GREEN M D.Characterisation of suspensions in settling and compression[D].Melbourne:The University of Melbourne,1997:246.
[20]USHER S P,de KRETSER R G,SCALES P J.Validation of a new filtration technique for dewaterability characterization[J].AIChE Journal,2001,47(7):1561-1570.
[21]LANDMAN K A,STANKOVICH J M,WHITE L R.The measurement of filtration diffusivity D(f)of a flocculated suspension[J].AIChE Journal,1999,45(9):1875-1882.
[22]LANDMAN K A,WHITE L R,BUSCALL R.The continuous flow gravity thickener:Steady state behavior[J].AIChE Journal,1988,34(2):239-252.