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随着工业的迅速发展,对金属的需求量越来越大,高品位的矿产资源逐年减少,原矿品位逐年下降,而冶炼要求入炉的精矿品位越来越高。如苏联在1965年铁矿开采品位为40.8%,1976年降低到36.1%。美国1959年入炉的铁精矿品位为53%,60年代至70年代初,要求达到65%以上。而且矿石嵌布粒
With the rapid development of industry, the demand for metal is getting larger and larger. The high-grade mineral resources are decreasing year by year. The grade of ore is declining year by year. The grade of refined ore required for smelting is getting higher and higher. Such as the Soviet Union in 1965, iron ore mining grade of 40.8% in 1976 to 36.1%. The grade of iron concentrate put into the furnace in the United States in 1959 was 53%. From the 1960s to the early 1970s, it required above 65%. And ore embedded grains