METHOD OF NEUTRALISING ACID SULPHATE-CONTAINING EFFLUENTS AND DEVICE TO THIS END Russian patent published in 2012 - IPC C02F9/04 C02F1/66 C02F1/62 C02F103/10 

FIELD: process engineering.

SUBSTANCE: invention relates to neutralisation of subdump waters of mining enterprises. Proposed method comprises neutralising acid sulphate-containing effluents by line milk and precipitating suspended particles in the presence of anionic flocculant. Neutralisation is performed in several stages. Cleaned water is subjected to tertiary treatment by filtration in grain material and cleaning in biological ponds. Metal hydroxide sediments produced at different stages are placed in separate sections of slurry sites. Proposed device comprises hydraulic cyclone 1, first stage settler 2 with reagents for proportioning lime milk 9 and precipitate circulation system 19, n identical settles 3-6 with reagents for proportioning lime milk 9 and flocculant 11, where n equals the amount of selectively extracted metals, slurry sites for dehydration of gypsum 15 and for selective dehydration of metal hydroxides 17, filter with grain structure 7 and back flushing system that includes flushing pump 13 and flushing water settler 14, biological ponds 8 with settling zone and tertiary treatment sections with higher aquatic flora.

EFFECT: higher rate of gypsum precipitation, selective precipitation of metal hydroxide, increased quality of water treatment.

3 cl, 3 dwg, 3 ex