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为了研究烧结电除尘灰中回收钾盐的强化浸出措施,使用ICP-AES、SEM-EDS和XRD分析技术对除尘灰的表面和内部形态,特别是钾盐的赋存形式进行分析。结果表明,该电除尘灰的主要成分是铁氧化合物,在其表面裸露吸附着一定含量的KCl晶体。水浸实验表明,该粉尘中的KCl可以通过水浸出、蒸发结晶的方式回收,其收率为18.56%。结晶产物的分析结果表明,KCl占61.21%,NaCl占13.40%,CaSO4占14.62%,K2SO4占10.86%。其水浸出动力学符合外扩散控制模型控制。强化浸出实验表明,提高浸出温度、加强搅拌、增加液固比等措施可以提高钾盐的浸出率和浸出速率。
In order to study the enhanced leaching recovery of potash from sintered ESP, the surface and internal morphology of dedusting ash, especially the forms of potassium salt, were analyzed by ICP-AES, SEM-EDS and XRD. The results show that the main component of the ESP is ferrite, and a certain amount of KCl crystals are barely adsorbed on the surface of the ESP. Flooding experiments show that the KCl in the dust can be recovered by means of water leaching, evaporation and crystallization, and the yield is 18.56%. Analysis of the crystalline product showed that KCl accounted for 61.21%, NaCl accounted for 13.40%, CaSO4 accounted for 14.62%, K2SO4 accounted for 10.86%. Its water leaching kinetics conforms to the diffusion control model control. Enhanced leaching experiments show that raising the leaching temperature, strengthening the mixing, increasing the liquid to solid ratio and other measures can increase the leaching rate of potassium and leaching rate.