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加拿大魁北克省的尼奥比克选矿厂处理含Nb_2O_5 0.72％的铌矿物黄绿石,大部分粒度小于65网目,分布在占60～80％以上的钙-镁碳酸盐脉石中(白云母)(Ca:Mg=2:1)。其余的是云母、磷灰石、长石、磁铁矿、重晶石、黄铁矿等。尼奥比克生产过程在加拿大专利№979543.中叙述过。尼奥比克选厂应用二段破碎矿石然后直接供给棒磨机,则其间未设贮仓,在一台350马力的哈丁(Hardinge)棒磨之后,二段磨矿(900马力Koppers球磨机)是与六台
Niobic concentrator in Quebec, Canada, deals with 0.72% niobium mineral pyrochlore, most of which are less than 65 meshes and are distributed in calcium-magnesium carbonate gangue (muscovite) accounting for 60-80% (Ca: Mg = 2: 1). The rest is mica, apatite, feldspar, magnetite, barite, pyrite and so on. The manufacturing process at Niagobi is described in Canadian Patent No. 979543. After applying the second-stage crushing ore at the Niobic mill and feeding it directly to the rod mill, no silo was set up. After a 350 horsepower Hardinge rod mill, the second-stage grinding (900 hp Koppers ball mill) Yes and six