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1. 发明授权

US4511543A Method for beneficiation of phosphate rock 失效
标题翻译：磷酸盐岩选矿方法
公开(公告)号：US4511543A
公开(公告)日：1985-04-16
申请号：US590278
申请日：1984-03-16
申请人： Yehuda Keren , Shmuel Carmon , Meyer Behar , Shimshon Axelrod
发明人： Yehuda Keren , Shmuel Carmon , Meyer Behar , Shimshon Axelrod
IPC分类号： B07B15/00 , C01B25/01 , C01F1/00 , C01F5/00
CPC分类号： C01B25/01 , Y02P20/129
摘要： The present invention relates to a method for beneficiation of phosphate rock by a thermal treatment, wherein an appreciable increase in P.sub.2 O.sub.5 and decrease in cadmium contents in the calcined product are achieved. According to the invention, the phosphate rock is contacted with hot gases possessing a temperature in the range of between 700.degree. C. to 1600.degree. C. for a period of below 60 seconds and subsequently the fines are removed by a conventional classification method thus obtaining an up-graded phosphate product with a relatively low cadmium content. The up-graded phosphate product is also characterized by a relatively low sulfide content as well as low organic matter, which are very advantageous in the phosphoric acid manufacture therefrom. One of the advantages of the method is the almost complete recovery of the P.sub.2 O.sub.5 present in the phosphate rock since no slaking for calcium oxide removal is utilized.
摘要翻译：本发明涉及通过热处理对磷酸盐岩进行选矿的方法，其中实现了煅烧产物中P 2 O 5明显增加和镉含量的降低。根据本发明，磷酸盐岩与温度在700℃至1600℃之间的热气体接触低于60秒的时间，随后通过常规的分级方法除去细粉，从而获得具有较低镉含量的高级磷酸盐产品。升级的磷酸盐产品的特征还在于硫化物含量相对较低以及低有机物质，这在其磷酸制造中是非常有利的。该方法的优点之一是磷酸盐岩中存在的P2O5几乎完全恢复，因为不利用去除氧化钙。

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