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One stage high density sludge purification of acidic waste water from mining operations to remove uranium, iron, sulfate ions and other impurities
One stage high density sludge purification of acidic waste water from mining operations to remove uranium, iron, sulfate ions and other impurities
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机译:采矿作业中酸性废水的一级高密度污泥净化,以去除铀,铁,硫酸根离子和其他杂质
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摘要
A process and apparatus are claimed for one-stage high density sludge purification of waste water from mining operations having pH 2-4 and containing metal ions such as Fe as well as up to 50g/l uranium or its products and up to 5g/l sulphate. Purification by a one-stage high density sludge (HDS) method of water of pH 2-4 from mining operations and containing metal ions such as Fe as well as up to 50g/l uranium or its products and up to 5g/l sulphate comprises (i) adding a precipitating agent (6) and/or BaCl2 by spraying the water from a chamber (2) via nozzle(s) (3), operating together with an atomizer on the water-jet pump principle, into the first chamber (10) of a multichamber vessel (9); (ii) simultaneously feeding into chamber (10) the recycled washed ore sludge (5) which has been previously mixed in a conditioning tank (8) with the precipitating agent (6), the sludge stream and the contaminated water (aereated during its free fall) being held in chamber (10) for 10-30 minutes for Fe and Mn oxidation before overflowing in tube (13); (iii) feeding each chamber (10) with precipitating agent and aereated contaminated water and raising the pH stagewise in increments of 1.0-2.5 to 7.0-8.5 so that addition of BaCl2 to the vessel (9) causes co-precipitation of radium; (iv) effecting solid/liquid separation by adding flocculant in a stable suspension bed of metal hydroxide-gypsum in a high capacity concentrator (14); (v) recycling for more than 10 times most of the drawn-off sludge (16) (controlled by the sludge level (18)) to the process and renewing pH alteration by addition of precipitating agent (6) and mixing with contaminated water; and (d) directly disposing of the remaining easily dewatered inorganic sludge residue. There is also an Independent claim for apparatus for purifying acidic, Fe- and sulfate-containing waste water from mining operations by use of earthen or concrete vessels and a clarifier or round concentrator, the apparatus comprising a distributing chamber (4) above a partitioned multichamber vessel; a distributor (2) with one or more nozzles (3) with different lengths and of inlet : outlet diameter ratio 1.5-2.5 : 1; an atomizer on each nozzle with air inlet openings and/or internal atomizing lattice; a bank of -2 aereating chambers (10) fed by the water-jet principle and of sufficient volume to allow the required dwell time; overflows (11) between the chambers; a narrow inlet tube (12) into a tube (13) which has a constriction just before its outlet end; and a concentrator (14) with cross-sectional area ratios inlet tube (12) (A0) : tube (13) (A1) : constriction (A2) : tube (13) outlet (A3) : concentrator (14) (A4) = 0.05-0.2 : 1 : 0.3-0.7 : 0.5-0.9 : 5-9, the upper slud ge level varying between 1.5m above the outlet of tube (13) and 0.5m below the clear water overflow (17) and the value of cross-sectional area (A4) of the concentrator being adjusted to the required through-flow for the plant.
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