低价钒溶液中铁(Ⅱ)和钒(Ⅳ)、铬(Ⅲ)的分离及莫尔盐的制备

Separation of Iron(Ⅱ) and Vanadium(Ⅳ)、Chromium(Ⅲ) from Low Valence Vanadium Solution and Preparation of Mohr’s Salt

本文以钒渣提取低价钒过程中得到的含低价钒、铬和铁的浸出液为研究对象,将真空冷却法应用于钒铁分离,铁从浸出液中以莫尔盐结晶析出,实现了铁与低价态钒、铬的高效分离并制备了莫尔盐。探究了pH值、硫酸铵添加量、反应时间、结晶时间对钒铁结晶分离行为的影响。结果表明,在真空度0.08 MPa,pH值为2.5,硫酸铵添加量(以n((NH_(4))_(2)SO_(4))/n(FeSO_(4))计)为1.2,反应140 min,结晶36 h的条件下,铁的去除率达86.42%,钒的损失率仅为0.52%,铬的损失率为1.64%,获得了纯度为99.23%的莫尔盐产品。

In this study, the leaching solution containing vanadium(Ⅳ), chromium(Ⅲ) and iron(Ⅱ) obtained in the process of extracting low valence vanadium from vanadium slag was taken as the research object, and the vacuum cooling method was applied to crystallize iron(Ⅱ) from the leachatein the form of Mohr’s salt,which realized the efficient separation of iron from vanadium(Ⅳ) and chromium(Ⅲ) and the preparation of Mohr’s salt. The effect of pH value, ammonium sulfate addition, reaction time, and crystallization time on the separation behavior of ferrovanadium crystallization were investigated. The results showed that the removal rate of iron reached 86.42% under the conditions of the vacuum degree of 0.08 MPa, pH value of 2.5, addition of ammonium sulfate(calculated as n((NH)SO)/n(FeSO)) of 1.2, reaction for 140 min and crystallization for 36 h. The loss of vanadium and chromium were only 0.52% and 1.64%, respectively. In addition, Mohr’s salt with a purity of 99.23% was obtained.