利用废钨催化剂制备高纯仲钨酸铵工艺研究

A process study on preparation of super high-purity APT from waste catalyst containing tungsten

随着石油化工行业的发展,废钨催化剂日益增多.为了充分回收利用钨,设计了预处理-钠化焙烧-浸出-离子交换工艺利用废钨催化剂制备高纯仲钨酸铵.结果表明:制备高纯仲钨酸铵工艺流程可行,实现了有价金属的综合回收.通过对比实验优化关键工艺参数,确定了钠化焙烧温度为650℃、研磨粒度为0.1 mm、Na2CO3与WO3的摩尔比为0.8、结晶温度为100℃.通过对材料进行X射线衍射以及分析其衍射图谱、扫描电镜观察其形貌,使钨的回收率达到95%以上、制备出优于均国家质量标准(GB/T10116-2007)仲钨酸铵的产品.

With the development of the petrochemical industry, tungsten-rich waste catalyst is progressively increasing. In order to fully recycle tungsten, a pretreatment-sodium roasting-leaching-ion exchange process was designed to prepare high-purity ammonium paratungstate by using tungsten-rich waste catalyst. The results show that the process of preparing high-purity ammonium paratungstate is feasible and the comprehensive recovery of valuable metals can be realized. The key process parameters is optimized by comparison of the experimental parameters. The sodium roasting temperature is 650 ℃, the grinding particle size is 0.1 mm, the molar ratio of Na2CO3 to WO3 is 0.8, the crystallization temperature is 100 ℃. The recovery rate of tungsten reaches over 95 % by observing the morphology of the material through X-ray diffraction of the material,analysis of its diffraction pattern and scanning electron microscopy, which means that a product of ammonium paratungstate superior to the national quality standard(GB/T10116-2007)can be manufactured.