Purification of Manganese in Manganese-Containing Acidic Wastewater by Red Mud
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.
wastewater treatmentmanganeseflocculation and precipitationmanganese-containing acidic wastewaterred mudnon-magnetic materialpolymeric aluminum chloride(PAC)polyacrylamide(PAM)
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