文献类型：期刊文献

英文题名：Alum recovery from waterworks sludge by solvent extraction using bi-(2-ethylhexyl) phosphate II. Slurry extraction

作者：Xu, Mei-Yan; Sun, Xian-Bo; Zhao, Qing-Xiang

机构：[1] School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2007

卷号：33

期号：3

起止页码：375

外文期刊名：Huadong Ligong Daxue Xuebao /Journal of East China University of Science and Technology

收录：EI(收录号：20072910703235)

语种：英文

摘要：Al present in a water treatment plant sludge (SiO2 54.6%, Al2O3 10.3%, organic matters 12.5%) may be recovered and recycled as liquid alum for coagulation treatment. A slurry (5% SS by weight) was first prepared by mixing the sludge in a bi-(2-ethylhexyl)-phosphate cP204 and kerosene extractant mixture. Under the optimal conditions of pH=5.0, CP204-0.5 mol/L, and phase ratio VO:VA=1:1, 96.9% of Al was extracted, by ion exchange of H+ for Al3+, from the sludge. Al in the extraction liquor was then stripped by H2SO4 solution (5 mol/L) in 3-stage stripping at a phase ratio of 5:1; 97.6% of Al was moved to the clear aqueous phase which was reusable in the waterworks. 98% of the P204/kero-sene extractant was recovered by centrifugation of the emulsified phase at 7000 r/min for 10 min.