絮凝沉降对全尾砂料浆流变特性的影响
|
摘要
通过研究沉降后料浆流变参数变化规律,探索基于料浆流变特性作为全尾砂絮凝沉降参数优化的可行性。以某铜锌矿全尾砂为实验材料,通过考察絮凝剂种类、入料体积分数、絮凝剂单耗这3个因素,进行静态絮凝沉降及料浆流变测试实验。实验结果表明:在絮凝剂种类筛选实验中,所选4种絮凝剂沉降效果区别较小,不同絮凝沉降后料浆屈服应力相差不大,添加N123作为絮凝剂时料浆黏度最小,絮团内部水分容易被挤出,絮凝沉降效果最佳;在入料体积分数及单耗实验中,当入料体积分数为10%~15%、絮凝剂单耗为25 g/t时,单位面积固体处理量和底流体积分数均较高,并且屈服应力及黏度达到极小值,有利于料浆进一步压密脱水及耙架运行。
The feasibility of optimizing flocculation settling parameters by analyzing how slurry rheological parameters change was tested. The flocculation settling experiments and the slurry rheological tests were carried out with full tailings from a copper zinc deposit in which three factors(flocculant type, feed slurry concentration and flocculant dosage) were studied. The results show that in the flocculant type screening experiments, there is little difference between the four flocculants and the yield stress of their respective slurries. The slurry has the minimum viscosity when using N123, and the inside water of aggregates can be easily extruded, thus the best flocculation settling results are obtained. The solid flux and the underflow volume fraction are high when the feed slurry concentration is 10%-15% and the flocculant dosage is 25 g/t. Meanwhile, the minimum yield stress and viscosity can be reached, which benefits the consolidation dewatering and rake running.
The feasibility of optimizing flocculation settling parameters by analyzing how slurry rheological parameters change was tested. The flocculation settling experiments and the slurry rheological tests were carried out with full tailings from a copper zinc deposit in which three factors(flocculant type, feed slurry concentration and flocculant dosage) were studied. The results show that in the flocculant type screening experiments, there is little difference between the four flocculants and the yield stress of their respective slurries. The slurry has the minimum viscosity when using N123, and the inside water of aggregates can be easily extruded, thus the best flocculation settling results are obtained. The solid flux and the underflow volume fraction are high when the feed slurry concentration is 10%-15% and the flocculant dosage is 25 g/t. Meanwhile, the minimum yield stress and viscosity can be reached, which benefits the consolidation dewatering and rake running.
引文
[1]焦华喆,王洪江,吴爱祥,等.全尾砂絮凝沉降规律及其机理[J].北京科技大学学报,2010,32(6):702-707.JIAO Huazhe,WANG Hongjiang,WU Aixiang,et al.Rule and mechanism of flocculation sedimentation of unclassified tailings[J].Journal of Science and Technology Beijing,2010,32(6):702-707.
[2]王洪江,陈琴瑞,吴爱祥,等.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 Hongjiang,CHEN Qinrui,WU Aixiang,et al.Study on the thickening properties of unclassified tailings and its application to thickener design[J].Journal of Science and Technology Beijing,2011,33(6):676-681.
[3]张钦礼,周登辉,王新民,等.超细全尾砂絮凝沉降实验研究[J].广西大学学报(自然科学版),2013,38(2):451-455.ZHANG Qinli,ZHOU Denghui,WANG Xinmin,et al.Experimental study on flocculating sedimentation of ultra-fine unclassified tailings[J].Journal of Guangxi University(Natural Science Edition),2013,38(2):451-455.
[4]李辉,王洪江,吴爱祥,等.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):1643-1648.LI Hui,WANG Hongjiang,WU Aixiang,et al.Pressure rake analysis of deep cone thickeners based on tailings settlement and rheological characteristics[J].Journal of Science and Technology Beijing,2013,35(12):1643-1648.
[5]CAMPBELL H W,CRESCUOLO P J.The use of rheology for sludge characterization[J].Water Science&Technology,1982,14(6/7):475-489.
[6]黄志斌.污泥流变性与脱水性能关系的研究[D].上海:东华大学环境科学与工程学院,2004:15-66.HUANG Zhibin.Investigation on The relationship of rheology and dewatering of sludge[D].Shanghai:Donghua University.School of Environmental Science and Engineering,2004:15-66.
[7]ZHAO Y Q,BACHE D H.Conditioning of alum sludge with polymer and gypsum[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2001,194(1):213-220.
[8]CHU C P,LEE D J.Moisture distribution in sludge:effects of polymer conditioning[J].Journal of Environmental Engineering,1999,125(4):340-345.
[9]王新民,刘吉祥,陈秋松,等.超细全尾砂絮凝沉降参数优化模型[J].科技导报,2014,32(17):23-28.WANG Xinmin,LIU Jixiang,CHEN Qiusong,et al.Optimal flocculating sedimentation parameters of unclassified tailings[J].Science&Technology Review,2014,32(17):23-28.
[10]LANGER S,KLUTE R,HAHN H.Mechanisms of floc formation in sludge conditioning with polymers[J].Water Science and Technology,1994,30(8):129-138.
[11]BESRA L,SENGUPTA D K,ROY S K,et al.Influence of polymer adsorption and conformation on flocculation and dewatering of kaolin suspension[J].Separation and Purification Technology,2004,37(3):231-246.
[12]DENTEL S K.Evaluation and role of rheological properties in sludge management[J].Water Science and Technology,1997,36(11):1-8.
[13]薛向东,金奇庭,朱文芳,等.超声对污泥流变性及絮凝脱水性的影响[J].环境科学学报,2006,26(6):897-902.XUE Xiangdong,JIN Qiting,ZHU Wenfang,et al.Influence of ultrasound on the rheological characterization and the flocculating dewaterability of sludge[J].Acta Scientiae Circumstantiae,2006,26(6):897-902.
[14]刘桂华,黄亚军,张明,等.表面活性剂对铝土矿选矿尾矿流变性的影响[J].矿冶工程,2009,29(2):25-28.LIU Guihua,HUANG Yajun,ZHANG Min,et al.Influence of surfactants on the rheological properties of bauxite tailings[J].Mining and Metallurgical Engineering,2009,29(2):25-28.
[15]HU Huiping,ZHANG Kunyu,ZHANG Lijuan,et al.Thermal decomposition behaviour of polyacrylamidomethyltrimethyl ammonium chloride in red mud separation process[J].Journal of Central South University of Technology,2008,15(6):808-813.
[16]MURTHY S N,NOVAK J T.Influence of cations on activated-sludge effluent quality[J].Water Environment Research,2001,73(1):30-36.
[2]王洪江,陈琴瑞,吴爱祥,等.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 Hongjiang,CHEN Qinrui,WU Aixiang,et al.Study on the thickening properties of unclassified tailings and its application to thickener design[J].Journal of Science and Technology Beijing,2011,33(6):676-681.
[3]张钦礼,周登辉,王新民,等.超细全尾砂絮凝沉降实验研究[J].广西大学学报(自然科学版),2013,38(2):451-455.ZHANG Qinli,ZHOU Denghui,WANG Xinmin,et al.Experimental study on flocculating sedimentation of ultra-fine unclassified tailings[J].Journal of Guangxi University(Natural Science Edition),2013,38(2):451-455.
[4]李辉,王洪江,吴爱祥,等.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):1643-1648.LI Hui,WANG Hongjiang,WU Aixiang,et al.Pressure rake analysis of deep cone thickeners based on tailings settlement and rheological characteristics[J].Journal of Science and Technology Beijing,2013,35(12):1643-1648.
[5]CAMPBELL H W,CRESCUOLO P J.The use of rheology for sludge characterization[J].Water Science&Technology,1982,14(6/7):475-489.
[6]黄志斌.污泥流变性与脱水性能关系的研究[D].上海:东华大学环境科学与工程学院,2004:15-66.HUANG Zhibin.Investigation on The relationship of rheology and dewatering of sludge[D].Shanghai:Donghua University.School of Environmental Science and Engineering,2004:15-66.
[7]ZHAO Y Q,BACHE D H.Conditioning of alum sludge with polymer and gypsum[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2001,194(1):213-220.
[8]CHU C P,LEE D J.Moisture distribution in sludge:effects of polymer conditioning[J].Journal of Environmental Engineering,1999,125(4):340-345.
[9]王新民,刘吉祥,陈秋松,等.超细全尾砂絮凝沉降参数优化模型[J].科技导报,2014,32(17):23-28.WANG Xinmin,LIU Jixiang,CHEN Qiusong,et al.Optimal flocculating sedimentation parameters of unclassified tailings[J].Science&Technology Review,2014,32(17):23-28.
[10]LANGER S,KLUTE R,HAHN H.Mechanisms of floc formation in sludge conditioning with polymers[J].Water Science and Technology,1994,30(8):129-138.
[11]BESRA L,SENGUPTA D K,ROY S K,et al.Influence of polymer adsorption and conformation on flocculation and dewatering of kaolin suspension[J].Separation and Purification Technology,2004,37(3):231-246.
[12]DENTEL S K.Evaluation and role of rheological properties in sludge management[J].Water Science and Technology,1997,36(11):1-8.
[13]薛向东,金奇庭,朱文芳,等.超声对污泥流变性及絮凝脱水性的影响[J].环境科学学报,2006,26(6):897-902.XUE Xiangdong,JIN Qiting,ZHU Wenfang,et al.Influence of ultrasound on the rheological characterization and the flocculating dewaterability of sludge[J].Acta Scientiae Circumstantiae,2006,26(6):897-902.
[14]刘桂华,黄亚军,张明,等.表面活性剂对铝土矿选矿尾矿流变性的影响[J].矿冶工程,2009,29(2):25-28.LIU Guihua,HUANG Yajun,ZHANG Min,et al.Influence of surfactants on the rheological properties of bauxite tailings[J].Mining and Metallurgical Engineering,2009,29(2):25-28.
[15]HU Huiping,ZHANG Kunyu,ZHANG Lijuan,et al.Thermal decomposition behaviour of polyacrylamidomethyltrimethyl ammonium chloride in red mud separation process[J].Journal of Central South University of Technology,2008,15(6):808-813.
[16]MURTHY S N,NOVAK J T.Influence of cations on activated-sludge effluent quality[J].Water Environment Research,2001,73(1):30-36.