萃取法回收水厂污泥中铝的技术研究 Ⅰ.清液萃取法  

Alum Recovery from Waterworks Sludge by Solvent Extraction Using Bi-(2-ethylhexyl)phosphate Ⅰ.Liquor Extraction

作　　者：徐美燕[1] 马燕[1] 孙贤波[1] 赵庆祥[1] 

机构地区：[1]华东理工大学资源与环境工程学院,上海200237

出　　处：《华东理工大学学报（自然科学版）》2007年第3期369-374,418,共7页Journal of East China University of Science and Technology

摘　　要：水厂污泥的铝含量高,是一种重要的铝再生资源。研究了液相离子交换萃取法铝回收技术。采用P204-煤油作为萃取剂,与水厂污泥的酸溶浸出液反应,经3级错流萃取,铝萃取率可达96.3%。以5 mol/L硫酸为反萃剂,在相比(VO∶VA)为5∶1的条件下经3级反萃,铝反萃率达到98.9%,反萃液符合液态商品硫酸铝的质量标准,可作为饮用水处理的混凝剂回用。The study results have demonstrated that A1 present in a water treatment plant sludge （SiO2 58.3%, Al2O3 6.31%, organic matters 12.2%） may be recovered and recycled as liquid alum for coagulation treatment. The sludge was first dissolved in H2SO4 solution （1 mol/L, 3 g H2SO4 for 1 g Al2O3）, and Al was then recovered by liquid phase extraction using a mixture of bi-（2-ethylhexyl） phosphate （P204） and kerosene. Under the optimal conditions of pH=3.5, cp204 =0.8 mol/L, and phase ratio Vo ： VA=1 ： 1, 96. 3% of Al was recovered in 3-stage extraction. Al in the extraction liquor was then stripped by H2SO4（5 mol/L） in 3-stage stripping at a phase ratio of 5 ：1; 98.9% of Al was moved to the aqueous phase which was reusable in the waterworks.

关 键 词：水厂污泥 铝回收 萃取 反萃取 二-(2-乙基己基)磷酸 

分 类 号：X705[环境科学与工程—环境工程]