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历史加拿大魁北克省圣劳伦斯(St.Lawrence)铌矿山自1961开办以来至1976年在奥卡(Oka)生产了约4000万磅含Nb_2O_5 51～54％的黄绿石精矿。该公司对铌(钶)的生产,从岩石采矿和选矿对黄绿石的富集应用浮选是第一家。以前铌作为付产品铌精矿产自砂锡产地。少量的黄绿石作为磷灰石精矿的付产品产自挪威。1961年奥卡开始生产500吨/天,于1974年增至3000吨/天,于1976年停产。因为该厂铌首先在商业数量上能满足需要,为此,它在工业上应用是可实现的。
History The St. Lawrence Niobium mine in Quebec, Canada, has produced about 40 million pounds of yellow-green stone concentrate containing 51-54% Nb 2 O 5 since 1976 in Oka until 1976. The company is the first to produce niobium (钶) from flotation of pyrochlores from rock mining and beneficiation. Previous niobium as a by-product of niobium concentrates originating from the sand tin. A small amount of pyrochlore is produced as a by-product of apatite concentrate from Norway. In 1961 Oka started to produce 500 tons / day and in 1974 it increased to 3,000 tons / day and was discontinued in 1976. Because the plant niobium first to meet the needs of the number of commercial, for which it is commercially available to achieve.