8th International Congress on Science and Technology of Ironmaking - ICSTI 2018

In recent years, dry de-dusting technology has been widely used. Alkali liquor spray scrubber was added after dry dust-catch process to removal such the corrosive medium as chlorine. However, the problem of corrosion cracking often occurred in the gas and hot blast pipes. The evaluating method was present through directly measuring the chlorine content in gas before and after alkali liquor spray scrubber. Compared to control PH value in alkali lye, the method above mentioned is more direct and reliable. The results show that the removal rate of chlorine in gas is between 10%~70%, and there is still the risk of corrosion of the equipment in the downstream process.