C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 9/00 (2006.01) C02F 1/64 (2006.01) C02F 5/02 (2006.01) C02F 1/52 (2006.01)
Patent
CA 2053146
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 the 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 sul- phate into iron(III)-hydroxide and that said chemi- cally destabilized wash water is freed from the re- -formed and residual solids in a further series-con- nected thickener (6) by adding flocculating and coa- gulating agents, is chemically stabilized and passed over a cold water tank (7).
Deutsche Voest-Alpine Industrieanlagenbau Gmbh
Mcfadden Fincham
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