电场作用下平果铝矿泥的沉降研究
|
摘要
铝土矿尾矿泥是氧化铝生产过程中形成的高含水量泥浆,具有粒径小、比表面积大、含水率高、沉降难的特点。为研究铝土矿泥在外加电场下的沉降机理,通过外加电场对矿泥进行沉降试验,即在不同的直流电压条件下(0 V、9 V、12 V、24 V、36 V),对矿泥沉降过程中的上清液高度、瞬时沉降速度、沉降速度等数据进行实时记录,并对试验过程中矿泥出现的电泳现象,结合电泳理论知识从物理学角度对矿泥沉降机制进行探讨。试验结果表明:矿泥的沉降效果随电场强度的加强而相应增强;由于矿泥颗粒带负电荷,随着电场强度的增强,矿泥颗粒会加速向金属电极片正极移动;在给出的直流电压条件下(0 V、9 V、12 V、24 V、36 V),24 V是分界点电压,48 V是该范围内的"上限电压"。
Bauxite tailing sludge is a high moisture content slurry formed in the process of alumina production, which has the characteristics of fine particle size, large specific surface area, high water content and difficult to settle in the suspension liquid. In order to further study the sedimentation mechanism of bauxite slurry under the applied electric field, the sedimentation tests of the sludge under different direct electric field(0 V, 9 V, 12 V, 24 V, 36 V) were conducted. During the sediment of the aluminum sludge, the clear liquid height, transient and average sediment velocity of the particles were real-time monitored. The electrophoretic phenomenon in the aluminum sludge was also observed and its effect on the sedimentation of the mine sludge were also discussed. The results show that the sedimentation effect of the mud is enhanced with the increase of the electric field magnitude. Because of the negative charge of the mud particles, as the electric field magnitude increases, the particles of the mud will accelerate the movement of the anode to the metal electrode plate. Under a given DC voltage condition(0 V, 9 V, 12 V, 24 V, 36 V), the voltage of 36 V should be the threshold voltage and 48 V is the "upper limit voltage" for the applied electric field.
Bauxite tailing sludge is a high moisture content slurry formed in the process of alumina production, which has the characteristics of fine particle size, large specific surface area, high water content and difficult to settle in the suspension liquid. In order to further study the sedimentation mechanism of bauxite slurry under the applied electric field, the sedimentation tests of the sludge under different direct electric field(0 V, 9 V, 12 V, 24 V, 36 V) were conducted. During the sediment of the aluminum sludge, the clear liquid height, transient and average sediment velocity of the particles were real-time monitored. The electrophoretic phenomenon in the aluminum sludge was also observed and its effect on the sedimentation of the mine sludge were also discussed. The results show that the sedimentation effect of the mud is enhanced with the increase of the electric field magnitude. Because of the negative charge of the mud particles, as the electric field magnitude increases, the particles of the mud will accelerate the movement of the anode to the metal electrode plate. Under a given DC voltage condition(0 V, 9 V, 12 V, 24 V, 36 V), the voltage of 36 V should be the threshold voltage and 48 V is the "upper limit voltage" for the applied electric field.
引文
[1] 吴亚君,李小平,冷杰彬.平果铝业公司赤泥的土壤改良[J].有色金属,2004(3):130-133.
[2] 张元福,刘永刚中国铝业公司广西分公司,甘国耀,等.平果赤泥综合利用现状和开发研究展望[J].轻金属,2004(12):13-17.
[3] 王立堂.赤泥利用的有效途径[J].世界有色金属,1998(8):43-45.
[4] Zhu X,Li W,Guan X.An active dealkalization of red mud with roasting and water leaching[J].J Hazard Mater,2015,286:85-91.
[5] 薛生国,李晓飞,孔祥峰,等.赤泥碱性调控研究进展[J].环境科学学报,2017(8):2815-2828.
[6] 肖红,唐达生.砂矿颗粒沉降运动规律试验研究[J].矿冶工程,2015,35(3):1-3.
[7] 李结全,欧孝夺,杨建伟,等.岩溶区铝土矿尾矿泥浆自重固结模型试验研究[J].广西大学学报(自然科学版),2012,37(1):152-159.
[8] BORRACR,BLANPAIN B,PONTIKES Y,et al.Smelting of bauxite residue ( red mud) in view of iron and selective rare earths recovery[J].Journal of Sustainable Metallurgy,2016,2(1):28-37.
[9] KASLIWAL P,SAIPS T.Enrichment of titanium dioxide in red mud:a kinetic study[J].Hydrometallurgy,1999,53(1):73-87.
[10] 王克勤,于永波,王皓,等.赤泥盐酸浸出提取钪的试验研究[J].稀土,2010(1):95-98.
[11] 范先锋,谢珉,肖莹,等.拜尔法氧化铝赤泥浮选工艺研究[J].北京矿冶研究总院学报,1992(2):18-22.
[12] 周科平,陈庆发,胡建华.地下铝土矿采矿环境再造连续采矿理念[J].广西大学学报(自然科学版),2008(2):168-172.
[13] 周秋生,范旷生,李小斌,等.采用烧结法处理高铁赤泥回收氧化铝[J].中南大学学报(自然科学版),2008(1):92-97.
[14] ABHILASH S,SINHA S,SINHA M K,et al.Extraction of lanthanum and cerium from Indian red mud[J].International Journal of Mineral Processing,2014,127(10):70-73.
[15] 徐会华.铝土矿尾矿沉降行为及强化研究[D].中南大学,2014.
[2] 张元福,刘永刚中国铝业公司广西分公司,甘国耀,等.平果赤泥综合利用现状和开发研究展望[J].轻金属,2004(12):13-17.
[3] 王立堂.赤泥利用的有效途径[J].世界有色金属,1998(8):43-45.
[4] Zhu X,Li W,Guan X.An active dealkalization of red mud with roasting and water leaching[J].J Hazard Mater,2015,286:85-91.
[5] 薛生国,李晓飞,孔祥峰,等.赤泥碱性调控研究进展[J].环境科学学报,2017(8):2815-2828.
[6] 肖红,唐达生.砂矿颗粒沉降运动规律试验研究[J].矿冶工程,2015,35(3):1-3.
[7] 李结全,欧孝夺,杨建伟,等.岩溶区铝土矿尾矿泥浆自重固结模型试验研究[J].广西大学学报(自然科学版),2012,37(1):152-159.
[8] BORRACR,BLANPAIN B,PONTIKES Y,et al.Smelting of bauxite residue ( red mud) in view of iron and selective rare earths recovery[J].Journal of Sustainable Metallurgy,2016,2(1):28-37.
[9] KASLIWAL P,SAIPS T.Enrichment of titanium dioxide in red mud:a kinetic study[J].Hydrometallurgy,1999,53(1):73-87.
[10] 王克勤,于永波,王皓,等.赤泥盐酸浸出提取钪的试验研究[J].稀土,2010(1):95-98.
[11] 范先锋,谢珉,肖莹,等.拜尔法氧化铝赤泥浮选工艺研究[J].北京矿冶研究总院学报,1992(2):18-22.
[12] 周科平,陈庆发,胡建华.地下铝土矿采矿环境再造连续采矿理念[J].广西大学学报(自然科学版),2008(2):168-172.
[13] 周秋生,范旷生,李小斌,等.采用烧结法处理高铁赤泥回收氧化铝[J].中南大学学报(自然科学版),2008(1):92-97.
[14] ABHILASH S,SINHA S,SINHA M K,et al.Extraction of lanthanum and cerium from Indian red mud[J].International Journal of Mineral Processing,2014,127(10):70-73.
[15] 徐会华.铝土矿尾矿沉降行为及强化研究[D].中南大学,2014.