【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。更多还原

【Abstract】 The study results have demonstrated that Al 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,c_P204=0.8 mol/L,and phase ratio V_O∶V_A=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.更多还原