铬酸钠碱性液中氢氧化钠的高效分离研究

Research on the Effective Separation of Sodium Hydroxide from Sodium Chromate Alkaline Solution

为实现铬铁矿碱溶得到的铬酸钠碱性液中Na2CrO4和NaOH的高效分离,研究了铬酸钠碱性液体系的蒸发结晶过程工艺,通过条件优化得到:碱性液的蒸发至碱度为47.67%(w%),结晶温度为40℃时,保温1 h后过滤,可以实现铬酸钠与氢氧化钠的有效分离。

In order to implement the high efficient separation of Na2 CrO4 and NaOH in sodium chromate alka- line solution, which can be prepared by the oxidation of chromite in alkaline solution, the evaporating crystallization process of sodium chromate alkaline solution was researched. Through the optimization of technological conditions,it can be found that, if the alkalinity of sodium chromate alkaline solution reaches 47.67 % （ w% ）, recrystallization temperature is 40 ℃, oven for one hour, the effective separation of Na2CrO4 and NaOH can be achieved by filtration process.