Red mud was pre-treated with process of reduction roasting followed by magnetic separation,and the obtained non-magnetic material was calcined and then dissolved in hydrochloric acid.After that,it was filtered after addition of saturated sodium meta-aluminate polymerizing agent,and then matured to prepare polymeric aluminum chloride(PAC)base liquid,which was used in a purification test.With PAC-base liquid and manganese-containing wastewater in a volume ratio of 1∶120,stirring speed of 140 r/min,pH of 8,reaction temperature of 30 ℃,and addition of polyacrylamide(PAM)at an amount of 20 mg/L,the manganese mass concentration in the wastewater reduced from 325.3 mg/L to 1.5 mg/L after 5 hours of settlement,showing manganese removal rate up to 99.5％.It is shown that the manganese mass concentration in the purified liquid can meet class Ⅰ limit in the national discharge standard.
关键词
废水处理/锰/絮凝沉淀法/含锰酸性废水/赤泥/非磁性物/聚合氯化铝/聚丙烯酰胺
Key words
wastewater treatment/manganese/flocculation and precipitation/manganese-containing acidic wastewater/red mud/non-magnetic material/polymeric aluminum chloride(PAC)/polyacrylamide(PAM)
维普
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