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Enhanced Mn^(2+)solidification and NH_(4)^(+)-N removal from electrolytic manganese metal residue via surfactants

查看全文 作　　者：Jiancheng [1]Shu;Xiangfei [1]Zeng;Danyang [1]Sun;Yong [2]Yang;Zuohua [2]Liu;Mengjun [2]Chen;Daoyong [1]Tan 高影响力作者 机构地区：[1]School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China;[2]School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China高影响力机构 出　　处：《Chinese Journal of Chemical Engineering》索引2022年第35卷第9期,共8页高影响力期刊 基　　金：supported by National Natural Science Foundation of China(52174386,21806132);the National Key Research and Development Program of China(2018YFC1903500);the Science and Technology Plan Project of Sichuan Province(2021YFH0058);the Key Research and Development Program of Guangxi Province(AB18126088)。 摘　　要：Electrolytic manganese metal residue(EMMR)harmless treatment has always lacked a low-cost and quick processing technology.In this study,surfactants,namely tetradecyl trimethylammonium chloride(TTC),sodium dodecyl benzene sulfonate(SDBS),sodium lignin sulfonate(SLS),and octadecyl trimethylammonium chloride(OTC),were used in the solidification of Mn^(2+)and removal of NH_(4)^(+)-N from EMMR.The Mn^(2+)and NH_(4)^(+)-N concentrations under different reaction conditions,Mn^(2+)solidification and NH_(4)^(+)-N removal mechanisms,and leaching behavior were studied.The results revealed that the surfactants could enhance the Mn^(2+)solidification and NH_(4)^(+)-N removal from EMMR,and the order of enhancement was as follows:TTC>SDBS>OTC>SLS.The NH_(4)^(+)-N and Mn^(2+)concentrations were 12.3 and 0.05 mg·L^(-1)with the use of 60.0 mg·kg^(-1)TTC under optimum conditions(solid–liquid ratio of 1.5:1,EMMR to BRM mass ratio of 100:8,temperature of 20℃,and reaction duration of 12 h),which met the integrated wastewater discharge standard(GB8978-1996).Mn^(2+)was mainly solidified as Mn(OH)_(2),MnOOH and MnSiO_(3),and NH_(4)^(+)-N in EMMR was mostly removed in the form of ammonia.The results of this study could provide a new idea for cost-effective EMMR harmless treatment. 关 键 词：Electrolytic manganese metal residue Mn^(2+)solidification NH_(4)^(+)-N removal SURFACTANTS
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