%0 Journal Article
%T Recovery of molybdenum, phosphorus and arsenic fromleaching solution of molybdenum residues by solvent extraction with primary amine and tributylphosphate
%A Zhao Youcai
%A Chen Shaowei
%A Xu Dimin
%A <br>Zhao Youcai
%A Chen Shaowei
%A Xu Dimin
%A Lin Ming
%J 环境科学学报(英文版)
%D 1995
%I 
%X Effective extraction and separation of molybdenum, phosphorus and arsenic from aqueous andleaching solutions of molybdenum residues was studied using low concentration of primary amine andtributylphosphate as solvents at the optimum acidity of pH 6-7. The loaded organic phase was stripped withNaOH solution with high O/A phase ratios, and the resultant aqueous solution containing high content ofmolybdenum , phosphorus and arsenic was acidified and sodium salts of 12-molybdophosphate or 12 - molyb-doarsenate can be obtained. The extraction mechanism was investigated using chemical analysis, UV and IRspetra as well as molar conductance determination. It was found that molybdenum,phosphorus and arsenicwas extracted into organic phase as 5 -molybdodiphosphoric acid and 6-molybdodiarsenic acid by solvationmechanism with the formation of hydrogen bond between heteropolyacids, primary amine and trib-utylphosphate. However, the extracted species exist in organic phase as ion - associated species. It was pro-posed that the transfer of proton from heteropolyacids to primary amine in extractedspecies occurs intramolec-ularly resulting to the formation of ion-associated species because primary amine is a weak base and het-eropolyacids are strong acids.
%K molybdenum
%K arsenic
%K phosphorus
%K solvent extraction
%K molybdenum residues<br>molybdenum
%K arsenic
%K phosphorus
%K solvent
%K extraction
%K molybdenum
%K residues.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=6CB1530875F53489BF1E81BD87B7F5E6&aid=FDD844A287F46203FB6554D8181A55D8&yid=BBCD5003575B2B5F&vid=DF92D298D3FF1E6E&iid=E158A972A605785F&sid=3FC4D669D19FF0C6&eid=F18BA6286A889C1C&journal_id=1001-0742&journal_name=Journalofenvironmentalsciences(China)&referenced_num=0&reference_num=0