FIELD: process engineering.
SUBSTANCE: invention may be used in mining. In compliance with this method, underspoil acid sulphate-containing effluents are neutralised by 5%-lime milk to pH 9.4-9.5. Then, added are anionic flocculant in concentration of 5-8 mg/l and pyrite final tailings in concentration of 2.5-10 g/l. Produced mix is mixed and settled. After settling, water is divided into two flows. One flow is directed for tertiary treatment before discharge into water structures. Another flow is directed for irrigation of spoils for partial neutralisation of underspoil waters to form circulation flow. Degree of water circulation for spoil irrigation purposes makes 20-30%.
EFFECT: reduced consumption of lime milk and amount of formed sediments.
2 cl, 1 dwg, 3 tbl, 2 ex
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