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矿物肥料生产的不断增长,在很大程度上是由于大力发展了磷矿采矿工业。因为高品位矿石资源的迅速枯竭,不同的低品位磷块岩矿床正在逐渐进入采选工业范围之内。 世界上这类磷酸盐原料的大部分集中在苏联,其特点是矿石均属中间品位,P_2O_5平均含量介于13～8～4％。 用化学方法直接处理这类矿石制造肥料是不经济的,同时,正如专门研究所发
The growing production of mineral fertilizers is due in large part to the vigorous development of the phosphate mining industry. Due to the rapid depletion of high-grade ore resources, different low-grade phosphorite deposits are gradually entering the mining industry. Most of the phosphate raw materials in the world are concentrated in the Soviet Union, which is characterized by the intermediate grade of ore with an average content of P_2O_5 ranging from 13% to 8%. It is uneconomical to use chemical methods to directly treat such ores to make fertilizers, and at the same time, as the specialized research institute