摘要
采用还原焙烧-磁选预处理赤泥,得到非磁性物;非磁性物经煅烧、盐酸溶出后加入饱和偏铝酸钠聚合剂聚合后过滤、熟化制备聚合氯化铝(PAC)基液;使用该PAC基液,在沉降时间5 h、PAC基液与废水体积比1∶120、搅拌转速140 r/min、pH值8、反应温度30℃、聚丙烯酰胺(PAM)投加量20 mg/L条件下处理含锰酸性废水,处理后液中锰质量浓度由325.3 mg/L降至1.5 mg/L,锰去除率达99.5%,净化后液中锰质量浓度达到国家一级排放标准。
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 classⅠlimit in the national discharge standard.
作者
阎丽
陈冬素
YAN Li;CHEN Dongsu(Hunan Research Academy of Environmental Sciences,Changsha 410004,Hunan,China)
出处
《矿冶工程》
CAS
北大核心
2024年第4期237-240,共4页
Mining and Metallurgical Engineering
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
wastewater treatment
manganese
flocculation and precipitation
manganese-containing acidic wastewater
red mud
non-magnetic material
polymeric aluminum chloride(PAC)
polyacrylamide(PAM)
