着重研究了在综合回收处理钒厂废水的过程中用蒸发脱水法回收硫酸钠时,钒、铬、硅、磷等元素的行径。已证明在脱水回收硫酸钠的过程中,钒和铬主要残留于母液中;硅由于受相关离子的影响,形成难溶化合物,大部分进入芒硝;磷则部分地进入芒硝。实验结果还表明,溶液中存在大量的硅,在脱水过程中析出硅胶,使过程无法进行,因此,直接用酸性脱水蒸发回收芒硝的办法是不行的。 The behaviors of vanadium, chromium, silicon, phosphorus and other elements in the recovery of vanadium plant wastewater by evaporation dehydration are emphatically studied. It has been proved that vanadium and chromium mainly remain in the mother liquor during the dehydration and recovery of sodium sulfate. Silicon, due to the influence of the relevant ions, forms insoluble compounds, most of which enter the thenardite and phosphorus partially into the thenardite. The experimental results also show that there is a large amount of silicon in the solution, which precipitates the silica gel during the dehydration process, so that the process can not be carried out. Therefore, it is not feasible to recover the thenardite directly by acidic dehydration evaporation.