Coupling magnetic particles with flocculants to enhance demulsification and separation of waste cutting emulsion for engineering applications.
Coupling magnetic particles with flocculants to enhance demulsification and separation of waste cutting emulsion for engineering applications.
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DOI：
10.1016/j.jes.2020.12.036
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发表时间：
2021-07
影响因子：
6.9
通讯作者：
Yongjiao Xiong;Baoqiang Wu;Xiang-feng Huang;Chenlu Li;Bingquan Lu;Jia Liu;Li-jun Lu;Shiyang Li;Kaiming Peng
中科院分区：
文献类型：
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作者：
Yongjiao Xiong;Baoqiang Wu;Xiang-feng Huang;Chenlu Li;Bingquan Lu;Jia Liu;Li-jun Lu;Shiyang Li;Kaiming Peng
将磁性粒子与絮凝剂偶联，以提高废切削液的破乳分离效果。为实现磁性破乳分离技术在废切削液处理中的大规模工程应用，研究了最佳磁性颗粒粒径和临界磁场条件。结果表明，微米级磁性粒子对切削液的破乳和分离效果与纳米级磁性粒子相当，有利于拓宽低成本磁性粒子的选择性。临界磁分离区域被确定为距离磁场源40 mm的区域。结果表明，与絮凝剂破乳相比，磁破乳分离具有明显的优势：絮凝体的分离时间由180-240 min缩短到15 min以内，絮凝体体积比由60%~ 90%降低到20%以下，絮凝体得到压缩;磁破乳分离对废切削液性质的变化具有良好的适应性。结合磁盘分离器的设计，实现了废切削液的连续破乳分离，在1.0吨/小时，至少10小时，得到澄清的出水与81%的化学需氧量和89%的浊度降低。本研究论证了磁破乳分离技术用于废乳化液大规模连续处理的可行性。此外，它解决了絮凝剂破乳工程实际应用中出现的絮体-水分离问题。
Magnetic particles were coupled with a flocculant to enhance the demulsification and separation of waste cutting emulsions. The optimal magnetic particle size and critical magnetic field conditions were investigated to achieve large-scale engineering application of magnetic demulsification separation for waste cutting emulsion treatment. The micro-scale magnetic particles were found to show comparable effects to nano-scale magnetic particles on enhancing the demulsification and separation of cutting emulsions, which are beneficial for broadening the selectivity of low-cost magnetic particles. The critical magnetic separation region was determined to be an area 40 mm from the magnetic field source. Compared to the flocculant demulsification, the magnetic demulsification separation exhibited a significant advantage in accelerating flocs–water separation by decreasing the separation time of flocs from 180–240 min to less than 15 min, compressing the flocs by reducing the floc volume ratio from 60%–90% to lower than 20%, and showing excellent adaptability to the variable properties of waste cutting emulsions. Coupled with the design of the magnetic disk separator, continuous demulsification separation of the waste cutting emulsion was achieved at 1.0 t/hr for at least 10 hr to obtain clear effluent with 81% chemical oxygen demand removal and 89% turbidity reduction. This study demonstrates the feasibility of applying magnetic demulsification separation to large-scale continuous treatment of waste emulsion. Moreover, it addresses the flocs–water separation problems that occur in practical flocculant demulsification engineering applications.