Ferrous dithionite process and composition for removing dissolve

Details Ferrous dithionite process and composition for removing dissolve Ferrous dithionite process and composition for removing dissolve

1992-06-03

1994-03-29

McCarthy, Neil M.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210717, 210719, 210720, 210721, 210722, 210912, 210913, 210914, 210724, 75712, 75714, 75739, 204DIG13, C02F 162, C02F 170

Patent

active

052981681

ABSTRACT:
A process for removing dissolved heavy metal from an aqueous solution is provided where the aqueous solution is mixed with a source of ferrous ion and dithionite ion in a first step at acidic pH to reduce and permit removal of the heavy metal. Solution from the first step is reacted in a second step with hydroxide slurrys obtained from third and fourth steps. A second solution from the second step is reacted in a third step with an alkali composition and a third solution. The third solution is reacted with a chelating agent for iron and an oxidizer in a fourth step. A solution of chelated iron from the fourth step is disposed of.

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