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

1987-06-30

1990-11-20

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423 42, 423 43, 423101, 210688, 210702, 210719, 210705, 210725, 210729, C01G 4900, C01G 5300, C01G 300, C01G 900

Patent

active

049717758

ABSTRACT:
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).sub.2) CaCl.sub.2, Ca(NO.sub.3).sub.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 effective 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.

REFERENCES:
patent: 4419246 (1983-12-01), Jayawant
patent: 4629570 (1986-12-01), Kennedy, Jr.

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