Sulphur mining
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After the founding of the People's Republic of China, exploration and census of sulfur deposits began in the 1950s. By 1956, two sulfur production sites were built, with an ore output of 26,000 tons. At the completion of the first five-year plan, the province's sulfur concentrate production has reached 33,000 tons.
In 1958, in the mass prospecting, mining and mining boom, due to the joint efforts of the geological department and the professional geological exploration team of the metallurgical system, the exploration, mining points and total output of the sulfur resources in the province have developed greatly. It has been found in Muping County Jinniushan, YeXian Haojiagou, small Yangzhuang Penglai County, Wulian County Qibaoshan, Ishikawa Prefecture Zhuang Xintai, Rushan County, Hu Jia Kou pyrite and Jiaonan County Xu Jia Yao natural Sulfur, 15 The mine was reviewed and the reserves of C?? In 1960, the sulfur mines were developed from three original locations to eight, and the sulfur concentrate production was 126,400 tons. In the national economic adjustment in 1962, due to resource conditions and financial constraints, these mines were successively dismantled.
In the early 1970s, the rapid development of the fertilizer industry promoted the development of sulfur resources. In 1972, the pyrite mines developed in the province included Jinniushan in Luanping County, Tangjiagou in Rushan County, Linglong in Zhaoyuan County, and Jiaojia in Jixian County. The output of sulfur concentrate powder was 74,000 tons. In 1977, 22 sulfur mines were put into operation, and the production of sulfur concentrate powder was 178,000 tons.
In 1978, some mines with low grades of ore, high production costs and large losses were closed. Only seven mines with good resource conditions, complete geological exploration data and high profits were retained. After adjustment, the annual production capacity of pyrite is 382,000 tons (physical), and the annual output of sulfur concentrate is about 70,000 tons.
In 1981, the seven pyrite deposits retained were completely rectified, which led to a new development in production. In the same year, the production of sulfur concentrate powder was 74,000 tons, and the profit was 410,000 yuan, basically turning losses into profits.
In 1984, the province has identified 7 sulfur mines with mining value and 5 mines that have been exploited. In the following year, the province's pyrite mines increased to 20, with a total output of 124,100 tons. The largest of these is the Zhaoyuan Gold Mine, which has an annual output of 23,800 tons. By 1988, there were still 20 pyrite mines in the province, and the output increased to 222,200 tons. Among them, 4 pyrites in the chemical system, the output is 36,300 tons, accounting for 16.3% of the total output; 16 other systems (including metallurgy, coal and township enterprises), the output is 185,900 tons, accounting for 83.7%.
Film Structure 357
Screw aspect ratio 32: 132:132:1
Screw direct 75:125:7575:75:90:75:7575:65:75:65:75:65:75
Mold width 250025002500
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Finished product thickness 0.03mm-0. 2mm0.03mm-0.2mm0.03mm-0.2mm
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