中文摘要：

为分析氯化钾从烧结电除尘灰中水浸出速率及浸出动力学,使用扫描电镜-线扫描分析氯化钾在烧结电除尘灰中的赋存状态及其与其它颗粒之间的赋存关系。实验发现烧结电除尘的平均粒径小于10μm,大多以团聚形式存在;氯化钾和氯化钠颗粒在烧结电除尘中的部分表面与其它粉尘颗粒如铁氧化物、钙镁化合物等有粘附连接。氯化钾在烧结电除尘中的存在形式表明其水浸出过程可视为可溶水的物质的溶解过程。借助于在线电导率测量手段分析烧结电除尘灰的水浸动力学。结果证明该粉尘的水浸过程符合扩散控制的溶解过程模型。浸出平衡在5min之内即可达到,同时氯化钾的浸出率达到 95%以上。

英文摘要：

In order to examine the leaching rate of potassium chloride from the sintering dust by water,surface morphology and inner structure of the dust,especially the existing state of potassium chloride,were observed by scanning electron microscopy（SEM） and linear scanning technique via energy dispersive spectroscopy（EDS）.The characterization shows that the sintering dusts are mostly porous composites or agglomerates of the fine dust particles with size less than 10 μm,and the potassium chloride and sodium chloride particles are partly covered by other water insoluble matters in the dust which consist of elements iron,calcium and etc.Exposure of potassium chloride in the agglomerated dust matrix of this kind suggests that the leaching can be simply perceived as the dissolution of water soluble matters in the dust.On-line monitor of specific electrical conductivity of the leaching system verifies the prediction that leaching kinetics of potassium chloride from the sintering dust fits dissolution model well.Leaching equilibrium can be reached within 5 min with potassium leaching ratio more than 95%.