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过程工程学报 ›› 2019, Vol. 19 ›› Issue (1): 118-125.DOI: 10.12034/j.issn.1009-606X.218175

• 反应与分离 • 上一篇    下一篇

离心场强化晶硅切割废料Si/SiC分离过程油水分相

王占奎1,2， 王 东2*， 王 志2， 马文会1， 万小涵1   

  1. 1. 昆明理工大学冶金与能源工程学院，云南 昆明 650093 2. 中国科学院过程工程研究所绿色过程与工程重点实验室，湿法冶金清洁生产技术国家工程实验室，北京 100190
  • 收稿日期:2018-04-10 修回日期:2018-07-13 出版日期:2019-02-22 发布日期:2019-02-12
  • 通讯作者: 王东 wangdong@ipe.ac.cn
  • 基金资助:
    国家自然科学基金资助项目;国家自然科学基金资助项目;省部共建复杂有色金属资源清洁利用国家重点实验室开放课题

Centrifugal field enhanced oil-water phase separate in Si/SiC separation process of silicon wire-saw waste

Zhankui WANG1,2, Dong WANG2*, Zhi WANG2, Wenhui MA1, Xiaohan WAN1   

  1. 1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China 2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2018-04-10 Revised:2018-07-13 Online:2019-02-22 Published:2019-02-12

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摘要： 对切割料中Si和SiC的高效分离进行了研究，利用晶硅切割废料中Si和SiC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/SiC分离效果、分相时间与浆料pH的关系及附有SiC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SiC去除效果变好，pH=7时，水相SiC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, pH=7时，水相中SiC含量为5.47wt%，分相时间由460 min缩短为2 min。通过对离心场中SiC的受力分析解析了离心场中SiC在油滴表面的赋存状态，证实离心场作用下，SiC沿油滴表面向离心力方向移动使油滴对SiC的吸附力减小。

关键词: 切割料, Si/SiC分离, 离心强化, 相分离

Abstract: 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 effect and 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 4.23wt% 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 5.47wt%, 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.

Key words: silicon wire-saw waste, Si/SiC separate, centrifugal intensification, phase transfer separation