离心场强化晶硅切割废料Si/SiC分离过程油水分相
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摘要
对切割料中Si和Si C的高效分离进行了研究,利用晶硅切割废料中Si和Si C表面性质的差异,向浆料中加入柴油并充分乳化,使SiC吸附在油滴上实现Si/SiC分离,对乳化后的浆料施加离心力强化油水分相,调节浆料pH值改变颗粒表面Zeta电位,调控乳化后的油滴大小,研究了Si/Si C分离效果、分相时间与浆料pH的关系及附有Si C的油滴表观密度与油滴直径的关系,对乳化后的浆料分别施加超重力系数为10, 50, 100, 150和200的离心力,考察了离心时间2 min时的分相效果和Si/SiC分离效果。结果表明,常重力场中,油滴尺寸越小,分相时间越长,但Si C去除效果变好,pH=7时,水相Si C含量为4.23wt%。油滴直径小于64?m时,油滴在浆料中不可上浮。离心场中,超重力系数为100, p H=7时,水相中Si C含量为5.47wt%,分相时间由460 min缩短为2 min。通过对离心场中Si C的受力分析解析了离心场中Si C在油滴表面的赋存状态,证实离心场作用下,Si C沿油滴表面向离心力方向移动使油滴对Si C的吸附力减小。
An efficient process of separating silicon and SiC in silicon wire-saw waste was studied. According to the different surface properties of Si and SiC in silicon wire-saw waste, SiC was absorbed by emulsified diesel to achieve the goals of separating Si/SiC. Centrifugal force was applied to the emulsified slurry to enhance the separation of oil-water phase during phase separation process, so the time required of oil-water phase separation was shortened. Adjusting pH of the slurry to change zeta potential of particles, and then to control oil drops size. The relationships of Si/SiC separation effectand phase separation time with slurry pH value were studied respectively. The relationship between the apparent density of oil drops with SiC and the diameter of oil drops was found. Stress analysis of SiC on oil drops surface in centrifugal field was studied, and the movement of SiC on the surface of oil drops in centrifugal field was analyzed. The results showed that the smaller size of oil drops, the longer time of phase separation and better results of removal SiC at normal gravity field. The content of SiC in silicon powder was 4.23 wt% at the pH of 7. When the oil drops diameter less than 64 μm, the oil droplets could not float in the slurry. Applying centrifugal force with a gravity coefficient of 10, 50, 100, 150, and 200 to the emulsified slurry, the effect of phase separation and Si/SiC separation with 2 min of centrifugal were investigated. When the gravity coefficient was 100 and pH was 7, the content of SiC in silicon powder was 5.47 wt%, the separation time decreased from 460 min to 2 min. It was confirmed that the centrifugal force made SiC moved along the surface of the oil drops to the direction of centrifugal force, which resulted in a decreased of adsorption force.
An efficient process of separating silicon and SiC in silicon wire-saw waste was studied. According to the different surface properties of Si and SiC in silicon wire-saw waste, SiC was absorbed by emulsified diesel to achieve the goals of separating Si/SiC. Centrifugal force was applied to the emulsified slurry to enhance the separation of oil-water phase during phase separation process, so the time required of oil-water phase separation was shortened. Adjusting pH of the slurry to change zeta potential of particles, and then to control oil drops size. The relationships of Si/SiC separation effectand phase separation time with slurry pH value were studied respectively. The relationship between the apparent density of oil drops with SiC and the diameter of oil drops was found. Stress analysis of SiC on oil drops surface in centrifugal field was studied, and the movement of SiC on the surface of oil drops in centrifugal field was analyzed. The results showed that the smaller size of oil drops, the longer time of phase separation and better results of removal SiC at normal gravity field. The content of SiC in silicon powder was 4.23 wt% at the pH of 7. When the oil drops diameter less than 64 μm, the oil droplets could not float in the slurry. Applying centrifugal force with a gravity coefficient of 10, 50, 100, 150, and 200 to the emulsified slurry, the effect of phase separation and Si/SiC separation with 2 min of centrifugal were investigated. When the gravity coefficient was 100 and pH was 7, the content of SiC in silicon powder was 5.47 wt%, the separation time decreased from 460 min to 2 min. It was confirmed that the centrifugal force made SiC moved along the surface of the oil drops to the direction of centrifugal force, which resulted in a decreased of adsorption force.
引文
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[3]邢鹏飞,赵培余,郭菁,等.太阳能级多晶硅切割废料浆的综合回收[J].材料导报,2011,25(1):75-79.Xing P F,Zhao P Y,Guo J,et al.Comprehensive recovery of solar grade polysilicon cutting waste slurry[J].Materials Review,2011,25(1):75-79.
[4]Tsai T H,Huang J H.Metal removal from silicon sawing waste using the electrokinetic method[J].Journal of the Taiwan Institute of Chemical Engineers,2009,40(1):1-5.
[5]Goetzberger A,Hebling C.Photovoltaic materials,past,present,future[J].Solar Energy Materials and Solar Cells,2000,62(1):1-19.
[6]Schwinde S,Kunert M.New potential for reduction of kerf loss and wire consumption in multi-wire sawing[J].Solar Energy Materials and Solar Cells,2015,136:44-47.
[7]Liedke T,Kuna M.A macroscopic mechanical model of the wire sawing process[J].International Journal of Machine Tools&Manufacture,2011,51(9):711-720.
[8]Sergiienko S A,Pogorelov B V.Silicon and silicon carbide powders recycling technology from wire-saw cutting waste in slicing process of silicon ingots[J].Separation and Purification Technology,2014,133:16-21.
[9]Lin Y C,Wang T Y,Lan C W,et al.Recovery of silicon powder from kerf loss slurry by centrifugation[J].Powder Technology,2010,200(3):216-223.
[10]黄美玲,熊裕华,魏秀琴,等.硅片线锯砂浆中硅粉与碳化硅粉的泡沫浮选分离回收[J].电子元件与材料,2010,29(4):74-77.Huang M L,Xiong Y H,Wei X Q,et al.Froth flotation technology for separation of Si and SiC powders in wire saw slurry from silicon wafering process[J].Electronic Components and Materials,2010,29(4):74-77.
[11]Hsu H P,Huang W P,Yang C F,et al.Silicon recovery from cutting slurry by phase transfer separation[J].Separation and Purification Technology,2014,133:1-7.
[12]Nguyen A V.New method and equations for determining attachment tenacity and particle size limit in flotation[J].International Journal of Mineral Processing,2003,68(4):167-182.
[13]陈敏恒,丛德滋,方图南,等.化工原理,第3版[M].北京:化学工业出版社,2006:143-147.
[14]程世萌,邓朝俊,何雄元,等.微液滴制备及其在静止流体中的浮升过程[J].过程工程学报,2016,16(3):388-393.Cheng S M,Deng C J,He X Y,et al.Preparation of micro-droplets and their rising process in stagnant liquid[J].The Chinene Journal of Process Engineering,2016,16(3):388-393.
[15]汤传义.水的表面张力与温度的关系[J].安庆师范学院学报(自然科学版),2000,6(1):73-74.Tang C Y.The relationship between water surface tension and temperature[J].Journal of Anqing Teachers College(Natural Science),2000,6(1):73-74.
[16]李玉瑛,李冰.影响石油污染物挥发行为的因素[J].生态环境,2007,(2):327-331.Li Y Y,Li B.Effects of factors on volatilization of petroleum contaminants[J].Ecology and Environment,2007,(2):327-331.
[17]马艳飞,郑西来,冯雪冬,等.油污土壤中柴油去除的影响因素[J].环境工程学报,2012,6(7):2417-2421.Ma Y F,Zheng X L,Feng X D,et al.Factors affecting diesel oil removal from oil-contaminated soil[J].Chinese Journal of Environmental Engineering,2012,6(7):2417-2421.