Patent ID: 6800260
Filing Date: 2004-10-05
Classification: C02F,C22B,Y02P

Abstract:
A process for treating iron-containing waste streams in which an iron-containing compound is produced from a liquid slurry stream, said process comprises the steps of:(a) adding an initial neutralization agent to a liquid slurry stream to form a first precipitate and a first liquid phase, wherein said liquid slurry stream comprises iron (II) chloride; (b) combining said first liquid phase and a sulfate-containing compound to form a second precipitate and a second liquid phase, wherein said second precipitate comprises gypsum and said second liquid phase comprises iron (II) chloride; (c) separating said second precipitate from said second liquid phase; and (d) subjecting said second liquid phase to an oxidation, neutralization and precipitation process to form an iron-containing compound and a residual liquid phase.