从高钼含量的白钨精矿及复杂钨矿物原料制取高纯APT

Production of High Purity APT from Scheelite and Complex Tungsten Raw Materials with a High Mo Content

中国现有钨资源中73％为白钨,同时41％以上属高钼矿,且越来越复杂难选,为适应新的资源形势的要求,我们发明了新的NaOH分解法和选择性沉淀法,前者能有效地从各种钨矿物原料(包括白钨矿)浸出钨,且将大部分杂质P、As、Si抑制在渣中,后者能有效地除去杂质如Mo、Sn等。 与传统的离子交换法结合,在结晶率为95％的情况下,APT的质量优于GB10116-88APT0级标准,当处理柿竹园钨中矿(含WO_3 50％～55％)时,回收率达95％～96％,与经典法处理标准黑钨精矿相当。

73% of the tungsten resources in China are scheelite and 41% of themare high molybdenum content ores, respectively, and their dressing becomes increasingly difficult. Such situation calls for new and advanced processes that can treat complex ores and still attain high overall recovery of tungsten. We have developed novel NaOH digestion process and selective precipitation process.The former is universal for leaching tungsten from various tungsten materials, including scheelite concentrate and keeps most of the impurity elements P,As,Si in residue, while the latter is effective for removing impurities such as Mo,Sn. Combined with the traditional ion exchange process, our new process can be used to produce APT that confirms with the Chinese national standard GB10116-88APT-0 with crystallization ratio of 95%.When treating high molybdenum scheelite concentrate from Shizhuyuan deposit with WO3 content of 50-55% , recovery of the new process may reach up to about 95% which is grossly the same as that from the traditional way for treating standard wolframite concentrates.