The total size of the three plants is 22100t/d. One of the plants was 500t/d, the second plant was 6600t/d, and the third plant was 15000t/d.
(1) Ore nature: The ore body treated by the mine is located in the granite porphyry and its contact with the Anshan porphyrite, forming a fine vein-dyed molybdenum deposit with large scale, simple shape, stable shape and stable grade.
There is no obvious boundary between the ore body and the surrounding rock, and the two have a gradual relationship. The northwestern end is cut by the Yanmen concave fault, and the boundary is obvious. The upper plate of the fault is the ore body and the lower plate is the surrounding rock. The ore molybdenum grade is rich in the middle and gradually becomes poorer on both sides. The companion beneficial components are copper , sulfur, etc., and the average grades are: Mo 0.098%, Cu 0.028%, and S (FeS2) 2.813%. The ore types are mainly shale -bearing Anshan shale and biotite Huaan'an shale, accounting for more than 70%, granite porphyry accounting for 20%, and 3% quartzite and tuff slate . Mining the rock mainly angular structure and plaque structure, useful minerals molybdenite, pyrite was stockwork disseminated structure.
Ore mineral composition: metallic minerals are molybdenite, molybdenum China, pyrite, limonite, followed by chalcopyrite, galena, sphalerite, magnetite, hematite help. Non-metallic minerals are mainly feldspar , quartz , sericite, muscovite, followed by calcite and chlorite.
The ore is mainly sulfide ore, and the oxidized ore only accounts for 1.5% of the total reserves.
The ore density is 2.7t/m3, the loose density is 1.6t/m3, and the Platts hardness is f=12~14.
(2) Process flow: Take Jinduicheng Second Selection Plant as an example, the original design capacity is 5000t/d, the crushing process is three-stage open circuit, and the crushing granularity is broken from 1000mm to 25~0mm.
The crushing granularity of each section is: coarse crushing 1000~250mm, medium crushing 250~70mm, fine crushing 70~25mm.
See the next two figures for the crushing, grinding and flotation processes:
In 1981, in order to improve the grade of molybdenum concentrate, an industrial test was carried out at the Jinduicheng No. 1 plant. The number of regrind sections and the leaching process were increased, and the grade of concentrate was increased from 46% to 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. The flotation concentrate contains impurities and the impurities after leaching are shown in the following table: 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. 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:
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.
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