System and method for eluting chlorine from metallurgical dust removal ash water

The invention belongs to the technical field of metallurgy, and relates to a system and method for eluting chlorine from metallurgical dust removal ash water. The method comprises the following steps:stirring: adding water and stirring metallurgical dust removal ash to obtain slurry; dehydration: dehydrating the slurry to obtain concentrated brine and mud cakes; washing: adding water to wash themud cakes to obtain iron slag, and recycling the washing water; purifying: adding a purifying agent into the washing water to purify the washing water to obtain a purified mother liquor; and evaporation: evaporating and crystallizing to purify the mother liquor to obtain KCl and mixed salt. The device comprises stirring equipment, dewatering equipment, flushing equipment, purifying equipment and evaporating equipment which sequentially communicate with each other. The system and the method solve the problem that as the content of Cl- in metallurgical dust removal ash of iron and steel enterprises is high, the recycling