Patent ID: 6355221
Filing Date: 2002-03-12
Classification: C01B,C01F,C02F

Abstract:
A process for removing soluble fluoride from a waste solution containing said soluble fluoride, said process comprising:(A) mixing said waste solution with an aqueous slurry containing seed calcium fluoride particles to form a first aqueous composition; (B) mixing said first aqueous composition with a calcium sulfate containing reagent to form a second aqueous composition; (C) advancing said second aqueous composition through a tubular reactor comprising a plurality of non-concentric tubes having a length and diameter to provide for an effective period of time and at a velocity sufficient to permit said soluble fluoride and said calcium sulfate containing reagent to react and attach to said seed particles of calcium fluoride, said seed particles of calcium fluoride thereby increasing in size to become enhanced particles; and (D) removing from said second aqueous composition a portion of said enhanced particles.