Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1997-03-19
1998-10-20
McCarthy, Neil
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210915, 423126, 423495, C02F 158
Patent
active
058242279
ABSTRACT:
A process for removing dissolved fluorides from an aqueous stream using at least two reactors wherein the dissolved fluoride containing aqueous feed and an unreacted aluminum containing sludge are combined in the first reactor to give a first reactor admixture after which the first reactor effluent stream is directed to the second reactor and therein combined with fresh alum and fresh sodium aluminate to give a second reactor admixture comprising a reduced fluoride aqueous solution and a partially reacted aluminum containing sludge and thereafter recovering the reduced fluoride aqueous solution and recycling at least a portion of the aluminum containing sludge to the first reactor.
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Cargnel Daniel A.
Crescenzi Mark K.
McCarthy Neil
WMX Technologies, Inc.
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