铝电极电浮选阴极的气泡特征及其影响因素研究
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摘要
在自制的分极式电浮选柱式反应器中研究了铝电极作用下阴极浮选柱中气泡特征及其影响因素,以期为电浮选的应用提供理论基础和数据支撑。考察了溶液p H值、电压强度及电极反应时间对气泡尺寸和气泡浓度的影响,探索了气泡上浮速率与气泡尺寸的关系。结果表明,电浮选阴极可获得直径小于100μm的氢气泡。溶液p H值、电压强度和电极反应时间对氢气泡尺寸和气泡浓度影响显著,且这种影响主要源于其对电极反应速率的影响。电极反应速率决定了气泡脱离电极板的时间以及单位时间的气泡生成量。电极反应速率越快,气泡的尺寸越小,浓度越高,上升速度越低。
Bubble characteristics and its influence factors in electroflotation with aluminum were studied in a homemade electrode-separated electroflotation column,which is aiming to provide a theoretical foundation and data support for the utilization of electroflotation. The effects of solution p H,voltage strength and electrode reaction time on bubble size and concentration were investigated. The correlation of bubble rising velocity and bubble size was explored. The results indicated that the size of hydrogen bubbles from cathode was less than 100 μm. The impact of solution p H value,voltage strength and electrode reaction time was significant on bubble size and its concentration. The primary impact factor( i. e. electrode reaction rate) decided the time of a bubble breaking away from electrode plate and the bubble accumulation per unit time. The higher the electrode reaction rate was,the smaller the bubble size would be,resulting in higher concentrate and lower rising velocity.
Bubble characteristics and its influence factors in electroflotation with aluminum were studied in a homemade electrode-separated electroflotation column,which is aiming to provide a theoretical foundation and data support for the utilization of electroflotation. The effects of solution p H,voltage strength and electrode reaction time on bubble size and concentration were investigated. The correlation of bubble rising velocity and bubble size was explored. The results indicated that the size of hydrogen bubbles from cathode was less than 100 μm. The impact of solution p H value,voltage strength and electrode reaction time was significant on bubble size and its concentration. The primary impact factor( i. e. electrode reaction rate) decided the time of a bubble breaking away from electrode plate and the bubble accumulation per unit time. The higher the electrode reaction rate was,the smaller the bubble size would be,resulting in higher concentrate and lower rising velocity.
引文
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[14]赵伟,周安宁,杨志远.一种H型分极串联式电浮选分离装置:CN206587916U[P].2017-10-27.
[15]王志刚,赖延清,刘伟,等.铝电解阳极气泡行为研究进展[J].轻金属,2007(5):27-31.
[16]石晟玮,王江安,蒋兴舟.水中微气泡上浮过程的力学影响因子研究[J].海军工程大学学报,2008,20(3):83-87.
[2]Fuat O,Bunyamin K.Treatment of pretreated coke wastewater by electrocoagulation and electrochemical peroxidation processes[J].Separation and Purification Technology,2015,150:268-277.
[3]Graeme JM,Jack L,Arshad A,et al.Couperthwaite,evaluation of electrocoagulation for the pre-treatment of coal seam water[J].Journal of Water Process Engineering,2014(4):166-178.
[4]Vu TP,Vogel A,Kern F,et al.Characteristics of an electrocoagulation-electroflotation process in separating powdered activated carbon from urban wasterwater effluent[J].Separation and Purification Technology,2014,134:196-203.
[5]Liakos TI,Lazaridis NK.Melanoidins removal from simulated and real wastewaters by coagulation and electro-flotation[J].Chemical Engineering Journal,2014,242:269-277.
[6]Golzary A,Imanian S,Abdoli MA,et al.A cost-effective strategy for marine microalgae separation by electrocoagulation-flotation process aimed at bio-crude oil production:optimization and evaluation study[J].Separation and Purification Technology,2015,147:156-165.
[7]Raju GB,Khangaonkar PR.Electro-flotation of chalcopyrite fines[J].International Journal of Mineral Processing,1982,9(2):133-143.
[8]Raju GB,Khangaonkar PR.Electroflotation of chalcopyrite fines with sodium diethyldithiocarbamate as collector[J].International Journal of Mineral Processing,1984,13(3):211-221.
[9]Sarkar M,Donne S,Evans G.Hydrogen bubble flotation of silica[J].Advanced Powder Technology,2010,21(4):412-418.
[10]Sun W,Ma L,Hu Y,et al.Hydrogen bubble flotation of fine minerals containing calcium[J].Mining Science Technology,2011,21(4):591-597.
[11]邓晓刚,陈器,廖振方.脉冲电浮选法在矿物浮选中的应用理论研究[J].矿山机械,2006,34(4):66-67,5.
[12]邓晓刚,廖振方,陈德淑.脉冲电浮水处理过程中的运动学数学模型[J].重庆大学学报,2008,31(8):928-931,941.
[13]Aaberg RJ,Ranum V,Williamson K,et al.The gas under anodes in aluminum smelting cells.Part II:gas volume and vubble layer characteristics[J].Light Metals,1997:341-346.
[14]赵伟,周安宁,杨志远.一种H型分极串联式电浮选分离装置:CN206587916U[P].2017-10-27.
[15]王志刚,赖延清,刘伟,等.铝电解阳极气泡行为研究进展[J].轻金属,2007(5):27-31.
[16]石晟玮,王江安,蒋兴舟.水中微气泡上浮过程的力学影响因子研究[J].海军工程大学学报,2008,20(3):83-87.