高铁酸钾制备影响因素的实验研究

Study on Preparation of Potassium Ferrate

文章介绍了湿法制备高铁酸钾的工艺,研究了次氯酸盐浓度、氧化反应温度、铁盐原料选择、洗涤所用溶剂种类等对高铁酸钾纯度和产率的影响。实验表明在制备次氯酸盐溶液时用冰水浴反应温度控制为20℃,选用37.5%的KOH溶液,可制得ClO-质量分数为123.5 g/L的饱和次氯酸钾溶液。实验还表明制备高铁酸钾的最佳反应时间为45 min,硝酸铁投加量为化学计量的80%时,可得到纯度为80%～90%、产率为71%的高铁酸钾固体产物。通过实验提出在0℃饱和的氢氧化钾溶液中不断搅拌,高铁酸钾晶体可以充分析出。

In this research,potassium ferrate was produced through the hypochlorite oxidation method,in which the hypochlorite concentration,reaction temperature,ferric salt dose,valid washing solvents etc.that impacted the yields and purity of potassium ferrate,were investigated.After a series of experiments,the powder compound of potassium ferrate with purity of 80%~90%,yield 71% was successfully prepared under the initial experimental conditions：hypochlorite concentration of 123.5g/L,reaction time 45 min and ferric dose 80% as stoichiometric in water bath at 20℃.As a result,in which potassium hydroxide saturated at 0 ℃ benefit fully potassium ferrate crystals precipitated.