Process for the treatment of wash water from the gas washing sys

Details Process for the treatment of wash water from the gas washing sys Process for the treatment of wash water from the gas washing sys

1991-10-11

1993-07-06

Silverman, Stanley S.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210718, 210722, 210737, 210774, 2101951, 210175, 210180, 210188, 210202, 55 72, 55 84, 55 84, 55228, 261DIG11, C02F 174

Patent

active

052250865

ABSTRACT:
The invention relates to a process for the treatment of wash water from the gas washing system of an iron ore reduction plant, the wash water being brought into direct contact with dust-laden gas in a gas washer, is removed from the latter and after solids separation is again supplied in cooled form to the gas washer. According to the invention this problem is solved in that wash water which is substantially freed from solids in a concentrator or thickener (1) is passed via a hot water tank (2) into a cooling tower (4) where the water is cooled and where there is simultaneously a separation of dissolved carbon dioxide, an enrichment with oxygen, a conversion of the calcium and magnesium hydrogen carbonates into carbonates and iron bicarbonate, as well as iron sulphate into iron(III)-hydroxide and that said chemically destabilized wash water is freed from the re-formed and residual solids in a further series-connected thickener (6) by adding flocculating and coagulating agents, is chemically stabilized and passed over a cold water tank (7).

REFERENCES:
patent: 2128617 (1938-08-01), Lawlor
patent: 3396514 (1968-08-01), Hurst et al.
patent: 3613333 (1971-10-01), Gardenier
patent: 3635000 (1972-01-01), Brown
patent: 3733788 (1973-05-01), Crowley
patent: 4288328 (1981-09-01), Montgomery
patent: 4318716 (1982-03-01), Doerges et al.
patent: 4632766 (1986-12-01), Firnhaber et al.

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