Heretofore it was possible to reduce only NOX or SO2 fractions in flue gases. In the washing operation of lime or limestone the utilization of catalysts results in voluminous deposits or high costs. According to the present method which aims at improving the economy of operation of such plants, the constituents of exhaust gases of discharge air are oxidized by means of oxidation agents such as chromium-VI and at the same time all the acid components are dissolved, the chromium-VI being reduced into chromium-III in the course of said operation. Furthermore, this lye is treated by extraction of distillation to obtain economical products. Additionally, the flue gases which are completely sulphur-free and also free of other noxious products are ecologically acceptable. Chromium-III thus obtained may be oxidized into chromium-VI into an electrochemical cell (14) to be recycled into the process.
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