Process for removal of nickel from effluent containing edta

Details Process for removal of nickel from effluent containing edta Process for removal of nickel from effluent containing edta

C - Chemistry, Metallurgy

22

B

53/377

C22B 3/44 (2006.01) C02F 1/52 (2006.01) C02F 9/00 (2006.01)

Patent

CA 1338165

A method for removing iron(III), copper(II), zinc(I) and nickel(II) from an effluent containing chelant (EDTA, DEPA, HOEDTA) comprising treating the effluent with a soluble calcium compound (e.g., Ca(OH)2, CaCl2, Ca(NO3)2) in a molar equivalent to the chelant in combination with a monovalent hydroxide to a pH greater than 12.4 and then adding an effecive amount of a dialkyldithiocarbamate (e.g.; sodium-N,N- diethyldithiocarbamate) to precipitate the metal hydroxides and nickel dialkyldithiocarbamate. Heating the solution to about 180 F further speeds up the removal of the nickel(II). The nickel concentration of spent chelant cleaning solution can be reduced to less than 1 ppm.

549669

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