1981 to improve the molybdenum concentrate grade, in JINDUICHENG a processing plant made industrial trials taken to increase the number of segments and then grinding and leaching process, concentrate grade increased from 46% to about 54%. The grinding fineness is ground from less than 0.074 mm95% to less than 0.037 mm and more than 90%. In order to further reduce the content of Pb, Cu, CaO and other impurities in molybdenum concentrate, the intrusion process was used, and the leaching was carried out with hydrochloric acid at 50-80 ° C, pH=1, and the liquid-solid ratio was 3:1. the result of. See the following table for the impurities in the flotation concentrate and the impurities after leaching: Comparison table before and after leaching of molybdenum concentrate project Mo, % Pb, % CaO,% Cu,% Fe, % Flotation 53.88 0.174 0.540 0.168 1.139 Leaching 54.68 0.032 0.048 0.114 1.072 In early 1986 he carried out industrial trials of low-grade copper recovered from the second and third beneficiation plant tailings molybdenum concentrates in three elections JINDUICHENG plant. The copper selection process adopts a rough, one-sweep, and three-fine process, and obtains a good index of copper concentrate grade of 16% and operation recovery rate of 70%. About 150 tons of copper metal was recovered in half a year. In 1980, in the case of shortage of molybdenum in the international market, the second plant chose to increase the production capacity, and the road was broken into closed-circuit crushing. The final particle size of the crushing was set to 15~0mm, and two large vibrating screens of 2100×6000mm were added, 1500×2200mm. Two sets of electric vibrating feeders, while grinding and floating also increased one ф3600×4000mm lattice ball mill, one ф3000mm double spiral classifier, one ф2100×3000mm regrind machine, and one CHF-X14 flotation machine 10 slots. Two ф6000mm concentrators, the production capacity is set at 6600t / d. The closed circuit system is not yet operational. The above-mentioned equipment for increasing the throughput is not included in the fourth table. Offshore Building,Prefabricated House,Prefab Vessel Building,Prefab Offshore House Yangzhou Tonglee Reefer Container Co., Ltd. , https://www.cimctlc.com
The technical indicators of the first, second and third selection plants of Jinduicheng, the consumption indicators of the concentrating plant and the main equipment of the second selection plant are shown in the following table: 