Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1997-12-05
2000-06-06
Jordan, Charles T.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
C02F 152
Patent
active
H0001852&
ABSTRACT:
An efficient and economical process for the waste treatment of spent metal plating solutions, primarily spent electroless nickel solutions, to significantly reduce the metal content therein, so as to permit direct discharge to municipal water systems without violation of the law. The waste treatment process is a sequential two-step chemical precipitation process, whereby the dissolved metal content is precipitated first by sodium borohydride reduction, followed by sodium dimethyldithiocarbamate precipitation, with an intermediate filtration step and pH adjustment step interposed there between. The amount of metal-bearing sludge produced is minimal. Furthermore, the bulk of the metals in the sludge may be recovered and reused, resulting in significant reduction in hazardous waste disposal costs.
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Alexander Celia L.
Cook Michael M.
Dunn David A.
Mariniello Anthony M.
McBride Brian A.
Benjamin Steven C.
Chelliah Meena
Jordan Charles T.
Morton International Inc.
White Gerald K.
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