论文部分内容阅读
概述 据初步统计,1975年国外开采磷、硫、钾等基础化学矿产原料的主要国家和地区,磷矿计有31个,天然硫矿30个,硫铁矿18个,钾盐矿18个。1974年磷、硫、钾矿总产值达68.6亿美元,占世界工农业总产值的0.154％。各国磷,硫,钾矿的产值在其国民经济总产值中所占比重各异,摩洛哥达11.13％,苏联为0.37％,美国为0.155％。各国磷、硫、钾矿产值在其采矿工业产值中的比重情况是:加拿大为7.1％,苏联为4.9％,西德为4％,美国为3.9％。 近年来,国外化学矿的发展,主要表
Overview According to preliminary statistics, in 1975, there were 31 phosphate rock mines, 30 natural sulfur mines, 18 pyrite and 18 potash mines in the major countries and regions exploiting basic chemical raw materials such as phosphorus, sulfur and potassium. In 1974, the total output value of phosphorus, sulfur and potassium reached 6.86 billion U.S. dollars, accounting for 0.154% of the world's total industrial and agricultural output. The output value of phosphorus, sulfur and potassium in various countries takes up a disproportionate share of the GNP of their national economies, with 11.13% in Morocco, 0.37% in the Soviet Union and 0.155% in the United States. The share of the country's phosphorus, sulfur and potassium mineral value in its mining output is 7.1% in Canada, 4.9% in the Soviet Union, 4% in West Germany and 3.9% in the United States. In recent years, the development of foreign chemical minerals, the main table