REMOVAL OF MOLYBDATE AND ARSENATE FROM AQUEOUS-SOLUTIONS BY FLOTATION

Ion flotation and adsorbing colloid flotation have been studied in thi s paper for the effective removal of molybdenum(VI) and arsenic(V) fro m dilute aqueous solutions. These different flotation methods were als o compared. Ion flotation using a cationic surfactant (dodecylamine) a s collector,as well as adsorbing colloid flotation using ferric hydrox ide as coprecipitant (or sorbent) and an anionic surfactant (sodium do decyl sulfate) as collector were examined. Laboratory-scale experiment s were conducted in order to assess the effects of the following param eters on the efficiency of the process: pH value, dosages of chemical reagents, initial concentrations of arsenic and molybdenum, and the pr esence of foreign anions, such as Cl- and SO42-. In practical applicat ions, ion flotation or adsorbing colloid flotation may be selected acc ording to the concentration of arsenic, molybdenum, and also the initi al [Mo]/[As] molar ratios in solution.