【摘要】 在次氯酸盐氧化法制备高铁酸钾过程中对废碱液进行回收利用,探讨了废碱液的提纯方法和制备高铁酸钾的工艺参数。废碱液提纯的方法是先向废碱液中加入少许KOH,使溶液碱度保持在13.00mol/L,然后将温度降至0℃,静置一段时间后过滤去除析出的KCl和KNO3杂质。高铁酸钾的最佳制备工艺条件是同时加入Fe(NO3)3.9H2O和KOH。经提纯的废碱液所制得的高铁酸钾的纯度和产率比未经提纯的废碱液明显提高,且经5次循环使用后,所制得高铁酸钾的纯度和产率依然可达60.74%和46.31%,实现了废碱液的循环利用。更多还原

【Abstract】 The waste alkali liquor was recycled in the process of potassium ferrate preparation by hypochlorite oxidation.The method for waste alkali liquor purification and the process parameters for potassium ferrate preparation were discussed.The method for waste alkali liquor purification is as follows: adding a little KOH to keep the solution alkalinity to 13.00 mol/L,cooling the solution to 0 ℃,standing for some time,and then removing the precipitated KCl and KNO3 by filtration.The optimum conditions for potassium ferrate preparation are adding Fe(NO3)3·9H2O and KOH simultaneously.The purity and yield of the potassium ferrate produced with the purified waste alkali liquor are increased significantly.After the waste alkali liquor is recycled for 5 times,the purity and yield of the potassium ferrate product can still reach 60.74% and 46.31% respectively.更多还原