Abstract: Taking the sintering dust with potassium resource from iron and steel metallurgical process as raw material, a new recovery process of potassium from the dust was proposed, which included water leaching, solid-liquid separation, purification, decolorization, solid-liquid separation, vacuum evaporation and cooling crystallization. By experiment, the optimum evaporation concentration ratio was obtained, under which the high-quality potassium chloride product could be acquired. At the beginning and ending boiling temperatures of 120 and 160℃, respectively, the rotational speed of 50~60 r/min and evaporating concentration ratio of 10.71, the content and recovery yield of potassium chloride from the dust reached 97.24% and 65.25%, respectively. The product could meet the first-class index requirements of GB6549-2011 and its particle size distribution was rather concentrated and homogeneous.

Key words: sintering EAF dust containing potassium, potassium chloride, evaporation, crystallization, recovery

摘要： 以某钢铁企业烧结机头含钾电除尘灰为原料，在分析其理化性质的基础上，提出了水洗脱钾?固液分离?除杂与脱色?固液分离?真空蒸发?冷却结晶的氯化钾回收新工艺. 通过实验研究，确定了获得高质量KCl产品的水洗脱钾液最佳蒸发体积浓缩比. 在溶液初始沸腾温度120℃、末沸腾温度160℃的范围内，以50~60 r/min转速进行真空旋转蒸发，经结晶冷却所得KCl产品含量和回收率分别达97.24%和65.25%，产品粒度分布较集中均匀，外观质量较好，达到国家标准GB6549-2011中工农业用KCl产品I类一等品要求.

关键词: 含钾电除尘灰, 氯化钾, 蒸发, 结晶, 回收