METHOD OF PROCESSING USED SOLUTIONS CONTAINING SULFURIC ACID, NONFERROUS METALS AND IRON (VERSIONS) Russian patent published in 2007 - IPC C02F1/66 C02F1/62 C02F103/16 

FIELD: utilization of used low-concentrated solutions formed at chemical and metallurgical plants.

SUBSTANCE: proposed method includes two versions of treatment of low-concentrated solutions containing non-ferrous metals and iron. Both versions describe treatment of solutions with alkaline neutralizer in three stages at maintenance of definite magnitudes of pH at each stage and separation of sediment of first two stages. According to first version, use is made of known neutralizer, lime for example. According to second version, neutralization at first two stages is performed by sediments of purification plants - technological sludge; after separation, purified solution is neutralized with alkaline reagent to pH equal to 8-12. Both versions make it possible to obtain sediment after neutralization which is enriched with nonferrous metals at reduced content of ballast elements.

EFFECT: enhanced efficiency.

3 cl, 4 ex