Electrolytic decomposition of ferrous sulphate in pickle...

Details Electrolytic decomposition of ferrous sulphate in pickle... Electrolytic decomposition of ferrous sulphate in pickle...

C - Chemistry, Metallurgy

25

B

204/80

C25B 1/22 (2006.01) C25F 1/06 (2006.01)

Patent

CA 1063548

Abstract of the Disclosure The invention relates to a process for the cyclic electrochemical processing of pickle waste liquors containing maximum 100 g. of sulfuric acid and minimum 25 g. of iron ions per litre, combined with the pickling of iron. According to the invention the ammonium, magnesium or alkali metal sulfate concentration of the waste liquor is adjusted to 0.5-1.0 mol./l. by introducing an appropriate salt, and the acid content of the waste liquor is reduced to a value not exceeding 100 g. of sulfuric acid/litre. Then the waste liquor is fed into and passed through the cathode chambers of a series of dual electrolytic cells with diaphragms, wherein the iron content of the waste liquor is reduced to a value of 7-15 g. of Fe2+/litre. Thereafter the-waste liquor is fed into and passed through the anode chambers in parallel with the cathode flow, and a current density in 15-22 A/dm2. of diaphragm surface and an electrolysis temperature of 70-90°C is maintained.

221738

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