Pilot Study of Blast Furnace Treatment of Cold Rolling Chromium-Containing Sludge
The cold rolling process of iron and steel production generates a large amount of chromium-containing wastewater in the process of pickling,alkaline washing,elec-troplating,etc.After the chromium-containing wastewater is concentrated and treated,the precipitate is chromium-containing sludge.Chromium-containing sludge is a kind of hazard-ous waste,which needs harmless treatment,but the cost of harmless treatment is high,and chromium-containing sludge is very easy to produce secondary pollution during storage,trans-portation and harmless treatment.For this reason,it is proposed that chromium-containing sludge be returned to the blast furnace as raw material for nearby digestion of chromium-containing sludge.It is also proved through tests that the chromium in the sludge can be re-duced into the molten iron without affecting the quality of the product,thus realizing the purpose of self-digestion of chromium-containing sludge in the iron and steel plant.
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