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1, the profile
The mine is part of the US Molybdenum Company. Located in New Mexico, USA, 56km northeast of Taos. The factory is 2500m above sea level. Has more than 50 years of mining history. In 1920, the American Molybdenum Company purchased the property rights. In 1923, the pit mining began, and the processing capacity was 50t/d. In December 1965, the open-pit mine and daily-treated ore 11kt/d plant was put into operation. In October 1969, the production capacity was expanded to 15 kt/d. The current production capacity has exceeded 16 kt / d. The annual production of molybdenum can reach 4.5~5.5kt (Mo).
2. Deposits, ores and mining
The Questa Mo deposit is a quartz porphyry molybdenum deposit. As of the end of 1983, the ore reserves were 95 Mt and the recoverable molybdenum resources were 179 kt.
Molybdenite is the only valuable mineral in the mine. Open pit mining contains Mo 0.12%, and underground mining ore contains Mo 0.18%. The Kusta ore body is in two basic rock masses, the fine-grained rock is in the lower part of the ore body, the andesite is in the upper part of the ore body, and the molybdenite is contained in the fracture zone of the basic rock type. Therefore, under rough grinding conditions Still able to float.
Metal ore minerals molybdenite addition, there is a small amount of pyrite containing copper pyrite, chalcopyrite, galena, and magnetite. There is also a small amount of molybdenum oxide mineral The gangue minerals are quartz, biotite , clay , gypsum , calcite and fluorite .
The molybdenum ore in the fine-grained rock can be recovered by a simple process, but the andesite is strongly hydrothermally altered, resulting in a large number of metamorphic argillaceous minerals. The ore properties vary greatly, and the ore dressing index fluctuates greatly. With fine grinding, the loss of molybdenum fine mud is obvious. According to many years of practice, we have chosen a medium-mineral re-grinding and then selecting a unique process.
In November 1965, an open pit mine was built with a capacity of 16.5 kt/d. In 1974, a pit mining system was built.
3. Mineral processing technology
Broken: There are three stages of pre-screening broken. The coarse crushing adopts a 1220×1880 mm A.C Superior type gyratory crusher . The screen sieve hole is 150mm, and the minimum discharge port of the crusher is 125~140mm. The medium crushed one of the 2135mm Norberg standard crushers. The upper sieve mesh was pre-screened to be 38 x 56 mm. The smallest discharge port of the crusher is 31.8mm.
The rough grinding consists of four ¢×4.27m Marcy lattice ball mills (reconstructed) and a ¢4.58×5.85m Norberg overflow ball mill. With ¢510 or ¢660mm. The flotation process is shown in the figure below.
Tuquista mineral processing process