高纯偏钒酸铵的制备技术研究

Preparation Technique of High Quanity Ammonium Metavanadate

从生产流程、工艺过程控制参数选取等方面分析了偏钒酸铵产品中杂质含量偏高的原因。研究了APV在不同温度条件下,过滤杂质含量的变化趋势,除杂系数的调整,碱性沉钒铵盐的选择以及沉淀加铵系数等重要参数对杂质含量控制的影响。通过先运用低铵盐沉钒制取多钒酸铵、再返溶除杂净化、最后碱沉的工艺流程,有效地将Cr、Si、Al等主要杂质含量由原来的0.05%以上降低至目前的0.02%以下,对攀钢现有高纯钒生产技术的提高具有重要的指导意义,为攀钢钒业新产品的开发奠定了基础。

This paper analyzed the cause of high impurities in ammonium metavanadate products at the aspect of the production process and selection of process control parameters.To control the content of impurities in AMV,the change trend of the impurity content after filtering,adjustment of the impurity removal coefficient and the selection of ammonium salt in basic precipitation were investigated in different temperature conditions.In the technological process of preparing ammonium polyvanadate（APV） by low ammonium salt precipitation,return dissolving the APV to remove the impurity,and then precipitating AMV in basic condition,the impurities in AMV could be reduced from 0.05% to 0.02% effectively,which was of important guiding significance on the improvement of high purity vanadium production technology,and laid a foundation to develop new products for Vanadium industry Co.,Ltd.,Pangang group.