METHOD OF METALLIC IONES CU(II),PB(II),HG(II),CD(II),NI(II),ZN(II),SR(II),FE(III),LA(III), UO2 2+,TH(IV) REMOVAL FROM AQUEOUS SOLUTIONS

摘要

The method applies to the removal of metallic ions such as Cu(II), Pb(II), Hg(II), Cd(II), Ni(II), Zn(II), Sr(II), Fe(III), La(III), UO22+, Th(IV) from aqueous solutions with the subsequent regeneration of used tenside is that tensides of type 2-/alkyl/-nitrilotriacetic acids, with alkyl C6 to C20 act on the aqueous solutions of metals so that a molar ratio of tenside and metal is 1:1 to 2 in the extent of pH 1 up to 9, while a separable precipitate of the metal complex with tenside arises either directly, or the pH necessary for the creation of precipitate is achieved by adding mineral acids, such as sulphuric acid, nitric acid, hydrochloric acid (hydrogen chloride), and subsequently by adding the foresaid mineral acids in a concentration of 1 to 5 moles x dm-3 to the isolated precipitate of the complex. Metallic ion is isolated in the form of a soluble inorganic salt under simultaneous precipitation of the original tenside. By the method described, 80 to 99.9 mass % of metal is removed from aqueous solutions, and by a subsequent regeneration of tenside, 90 to 99 mass % of the original tenside is possible to obtain for repetitive use.