Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1994-03-24
1997-04-08
McCarthy, Neil
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210906, 210911, 210912, 210758, 210722, C02F 152, C02F 162, C02F 172
Patent
active
056184395
ABSTRACT:
A method for purifying aqueous solutions having varying concentrations of contaminants and/or various contaminants including ions of several metals and elements by conducting precipitation in a first precipitation stage by adding lime in a surplus quantity whereby a pH of about 12 is established and maintained in the solution and a major part of the contaminant content is precipitated so as to form a solution having a substantially constant composition and to form a precipitate that is isolated and removed together with residual lime. Precipitation is then conducted in a second precipitation stage by adding a reagent for precipitation at a pH in the range of 4-11 wherein residual contaminant in the formed solution from the first precipitation stage is precipitated the precipitate is isolated and returned to the first precipitation stage.
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Boliden Contech AB
McCarthy Neil
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