钢铁冶金烧结机头电除尘灰中氯化钾的回收  

Recovery of Potassium Chloride from Sintering EAF Dust

作　　者：张梅[1] 付志刚[1] 吴滨[1] 吕娜[1] 曾乐林 杨运泉[1] 

机构地区：[1]湘潭大学化工学院,湖南湘潭411105

出　　处：《过程工程学报》2014年第6期979-983,共5页The Chinese Journal of Process Engineering

基　　金：湖南省自然科学基金资助项目(编号:14JJ5027);国家水体污染控制与治理科技重大专项基金资助项目(编号:2010ZX07212-008)

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.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.

关 键 词：含钾电除尘灰 氯化钾 蒸发 结晶 回收 

分 类 号：TQ131.13[化学工程—无机化工]