高铁酸钾制备影响因素的实验研究

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。

Study on Preparation of Potassium Ferrate

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.