Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1991-09-19
2000-12-26
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210682, 210688, C02F 142
Patent
active
061653675
ABSTRACT:
A method for removing low levels of heavy metal from chemical/industrial waste streams containing interfering anions which typically form strong complexes with heavy metals such as uranium utilizes an ion exchange resin having amino-phosphonic functional groups which selectively capture the heavy metal from the chemical waste stream in an efficient manner such that the amount of heavy metal in the waste stream is reduced to sub-ppm levels. After capture, the resin is treated with a sequestering agent, such as a solution of ammonium fluoride or ammonium sulfate, which releases the heavy metal from the resin. The resin is then regenerated with a sodium solution and returned to service. Utilizing ion exchange and a resin containing amino-phosphonic functional groups allows removal of heavy metal to a level of less than or equal to 0.1 ppm which is a substantial reduction in view of the presence of significant quantities of complexing anions in the waste stream.
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Cintins Ivars
Siemens Power Corporation
Zebrak Ira Lee
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