钨钼混合粗精矿直接制备高纯度钨钼粉的研究

发布时间：2018-06-04 16:38

  本文选题：钨钼矿 + 焙烧-水浸　； 参考：《郑州大学》2017年硕士论文

【摘要】：钨钼矿是我国的一种多金属复杂矿资源,但由于复杂的地质条件、特殊的矿石构造,导致该矿选矿极为困难,造成现有加工成本偏高。目前,工业上对氧化钨钼矿的选别及提取的生产先例极少。在选矿方面,中国地质调查局郑州矿产综合利用研究所已成功地实现了钨钼多金属矿的浮选富集,获得Mo+WO330%钨钼混合粗精矿。本课题作为冶金研究部分,以浮选后的钨钼混合粗精矿为对象,开发了一条制备高纯度钨钼粉的新工艺。主要研究内容包括焙烧-酸洗联合预处理、预处理料苏打焙烧-水浸提取钨和钼、铝盐-镁盐共沉淀净化除杂、共沉淀-共结晶制取高纯度钨钼化合物、共煅烧-共还原钨钼化合物制备高纯度钨钼粉。主要研究结果如下:首先对钨钼混合粗精矿进行化学成分和物相分析,并制定实验方案。进行了焙烧-酸洗联合预处理工艺研究,结果显示,在最佳焙烧温度为600℃,3%盐酸室温酸洗条件下,钨、钼的回收率分别为98.17%、96.24%;有效除去杂质和脉石矿物,钨、钼品位分别从16.51%、14.92%提高至19.90%、17.63%。对焙烧-酸洗联合预处理料进行了浸出试验研究。结果表明,在最佳工艺条件下:焙烧温度为850℃,焙烧时间为2h,加入所需Na_2CO_3化学计量比为3.0和ω_(SiO_2)/ω_(Conc)=12%;水浸温度70℃,液固比为3:1,水浸时间为60min的条件下,钨和钼的浸出率可达98.89%和99.41%。对浸出液进行共除杂-共沉淀-共结晶等工艺研究。实验发现,在最佳实验条件下,共沉淀法净化工序钨、钼回收率分别为99.50%、99.68%;高温酸沉钨和钼的沉淀率分别为84.02%和99.03%;低温酸沉钨、钼结晶率分别为98.88%、93.51%;酸洗低温结晶产物钨和钼回收率分别为91.67%和97.89%;蒸发结晶获得钨、钼化合物纯度大于99.95%。在煅烧温度500℃、一次还原温度520℃、二次还原温度920℃的工艺条件下,获得钨钼粉纯度大于99.92%,氧含量为500ppm。课题研究克服了传统方法所带来的工艺流程长、钨钼分离难度大的问题,为我国大量钨钼共生资源综合、高效利用开辟了新途径。本课题利用低品位钨钼氧化矿为原料,采取共除杂-共浸出-共沉淀-共还原等工艺技术手段直接制备高附加值的高纯度钨钼粉,为我国开发与利用复杂低品位有色金属资源提供了技术支持。
[Abstract]:Tungsten molybdenum ore is a kind of polymetallic complex ore resource in China, but because of complex geological conditions and special ore structure, it is extremely difficult to concentrate, resulting in high processing cost. At present, there are few industrial precedents for the separation and extraction of tungsten molybdenum oxide. In the aspect of mineral processing, the Zhengzhou Institute of Comprehensive Utilization of Mineral Resources of China Geological Survey has successfully realized the flotation enrichment of tungsten and molybdenum polymetallic ore, and obtained the mixed coarse concentrate of Mo WO 330% tungsten and molybdenum. As a part of metallurgical research, a new process of preparing high purity tungsten and molybdenum powder was developed by taking the mixed coarse concentrate of tungsten and molybdenum after flotation as the object. The main research contents include roasting-acid pickling combined pretreatment, soda-roasting-water leaching to extract tungsten and molybdenum, aluminum salt-magnesium salt coprecipitation purification, coprecipitation-co-crystallization to prepare high purity tungsten and molybdenum compounds. Preparation of high purity tungsten and molybdenum powder by co-calcination-co-reduction of tungsten and molybdenum compounds. The main results are as follows: firstly, the chemical composition and phase of tungsten and molybdenum mixed coarse concentrate are analyzed, and the experimental scheme is worked out. The combined pretreatment process of roasting and pickling was carried out. The results showed that under the optimum roasting temperature of 600 鈩，

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