连续法电解制备高铁酸钾及工艺研究

Study on continuous preparation of potassium ferrate by electrolytic process

高铁酸盐是一种新型的绿色净水剂,为了实现高铁酸盐的中试化生产,研制了一套能够连续进料的隔膜电解槽实现了阳极液循环利用,并应用于高铁酸盐的在线连续制备;对全铁及六价铁的分析方法以及高铁酸钾的提纯和干燥工艺等进行了研究。利用无汞法和传统的有汞法分别对高铁酸钾中总铁的含量进行测定,两者结果基本一致。同时,还利用改进亚铬酸盐法和传统亚砷酸盐法分析六价铁,两者结果也基本一致;改进后的高铁酸钾纯化工艺更简单,使用有机溶剂更少,制备成本更低。

Ferrate is a new green purifying agent,which has a wide range of uses and applications in water treatment.To achieve the pilot production of ferrate,a diaphragm cell of continuous feed was developed.The anolyte solution can be recycled in the diaphragm cell,which was applied to the continuous and on-line production of ferrate.Not only the analytical methods of total iron and Fe（Ⅵ）,but also purification and drying process of ferrate were studied.The analysis of total iron in the ferrate was compared between mercury-free method and the traditional mercury method,and the results were very close.Meanwhile,the content of Fe（Ⅵ） analyzed by the improved chromite method was consisted with that of traditional arsenite method.All aspects of fresh electrolyte of continuous electrolysis were superior to that of electrolyte recirculation.The preparation process after improvement became much simpler for ferrate purification,less use of organic solvents,and lower cost of production.