铝灰酸溶法制备聚合氯化铝

Preparation of Polyaluminium Chloride from Alumina Ash by Acid Dissolution Method

以铝灰为原料采用酸溶法制备了聚合氯化铝(PAC),并通过正交实验优化了PAC制备的最佳工艺参数,并考察了自制PAC对废水COD的去除效果。制备PAC的最佳工艺条件为:m(铝灰)∶V(HCl)∶V(H2O)=10∶20∶40,反应温度85℃,反应时间2.5 h,搅拌转速80 r/min,熟化时间30 h,熟化温度60℃。采用生石灰可高效、经济地调节产品的盐基度,且产品在处理印染废水时COD去除率达64.7%,高于市售同类产品。

Polyaluminium chloride（PAC） was prepared from aluminum ash by acid dissolution method.The process parameters were optimized through orthogonal tests,and the effect of the self-made PAC on the removal of wastewater COD was studied.The optimum preparation conditions are as follows：m（aluminum ash）∶V（HCl）∶V（H2O）=10∶20∶40,reaction temperature 85 ℃,reaction time 2.5 h,stirring speed 80 r/ min,curing time 30 h,curing temperature 60 ℃.The basicity of the product can be adjusted efficiently and economically by quicklime.The COD removal rate of dyeing wastewater reaches 64.7%,which is higher than that of similar flocculants.