【摘要】 <正>引言 磷矿是磷肥生产的主要原料,对于它的品位评价,不仅决定于其中所含磷酸盐的量,亦决定于其杂质矿物的含量。特别是,铁铝杂质的含量是评价磷矿品位重要条件之一。因为这些杂质矿物对磷肥生产十分有害。它非但使生产加工过程发生困难,而且使磷肥的质量降低,甚至不合标准。因此,在选择磷矿原料时,对其中所含铁铝杂质矿物的含量有严格的限制。例如,在过磷酸钙或萃取磷酸生产中,磷矿原料中铁的含量不能超过如下的规定:更多还原

【Abstract】 The natural phosphate rocks were the raw materials in the production of phosphatic fertilizers. In technical point of view, for the evaluation of phosphate rock was not only considered the content of calcium phosphate, but also the amount of harmful minerals containing in it. The mineral sesquioxides were the most harmful substances in the manufacture of phosphate fertilizers by the acid decomposition processes.Solubilities of mineral sesquioxides of phosphate rock in nitric, hydrochloric and phosphoric acids would depressed significantly after the calcination of the rock at 900℃ for more than one hour. Hence, it was possible to direct use the phosphate rock containing high in mineral sesquioxides for the manufacture of phosphate fertilizers without previous treatment.更多还原