| 摘要 |
PCT No. PCT/GB94/02216 Sec. 371 Date Apr. 19, 1996 Sec. 102(e) Date Apr. 19, 1996 PCT Filed Oct. 11, 1994 PCT Pub. No. WO95/11199 PCT Pub. Date Apr. 27, 1995A process for the treatment of aqueous acidic liquors containing dissolved aluminum and/or iron compounds to produce an aluminum and/or iron sulfate water-treatment product is characterized by the combination of steps comprising contacting the liquor with a basic material capable of reacting with the dissolved aluminum and/or iron compound to precipitate aluminum and/or iron values, separating the precipitate in the form of a cake or slurry from the remaining liquor, treating the cake or slurry with sulfuric acid to re-dissolve aluminum and/or iron values and to produce a solution of aluminum and/or iron sulfate and separating suspended solid matter from the solution. The liquor may be a waste product from industrial processes or may be a mine effluent and the process avoids the need to dispose of these to waste. Where the liquor is derived from the acid activation of an aluminosiliceous mineral, the product contains dissolved silica, and a substantial quality of an oil bleaching agent is produced as a byproduct. The product may be mixed with a low molecular weight cationic polymer to give an enhanced flocculation performance. |
