Jinduicheng molybdenum mine is a super-large porphyry molybdenum deposit, open-pit mining, mineral processing design and production scale has expanded from 500 t/d in the initial stage of mine construction to 40,000 t/d now。 At the same time, Jinduicheng to Henan Ruyang, Anhui Jinzhai expansion of resources, has been in the Ruyang Donggou molybdenum mine new 5 kt/d, 20,000 t/d concentrator, become the backbone of Shaanxi nonferrous mine, in the domestic molybdenum charge industrial production occupies an extremely important position。 Mineral resources are non-renewable, molybdenum resource reserves are decreasing day by day, summary and discussion of Jinduicheng molybdenum mineral processing technology progress and development direction, for the sustainable development of enterprises and China molybdenum processing technology progress has important practical significance, has a good reference for similar mine production and construction。Jinduicheng Molybdenum mine is a typical porphyry type molybdenum deposit, with ore bodies divided into north open pit and south open pit。 The north open-pit rock type is mainly granite porphyry and andesite porphyrite, the south open-pit upper main rock type is quartzite, the lower main andesite porphyrite。 The main metal minerals in the north and south open-pit ore are molybdenite, pyrite and a small amount of chalcopyrite, magnetite, pyrrhotite, chalcocite, galena, sphalerite, gangue minerals are mainly quartz, and a small amount of feldspar, fluorite, mica, chlorite and so on。 Molybdenite is disseminated in fine veins, and the particle size is generally 0.027 ～0.045 mm, closely related to quartz, pyrite, chalcopyrite, sphalerite and so on。The ore-rock type of Ruyang Donggou Molybdenum deposit is granite porphyry，The main metal minerals in the ore are molybdenite, magnetite and pyrite，There are also a small amount of hematite, ilmenite, galena, sphalerite, chalcopyrite;The main gangue minerals are feldspar, quartz, hornblende, chlorite, kaolinite，The other ten thousand square data have a small amount of biotite, sericite, calcite, fluorite, talc and carbon。 Molybdenite is mainly distributed in sheet aggregate, and the distribution size is relatively coarse, in +0.The share of molybdenite in 074 mm particle grade is 36.61% are closely related to quartz, chlorite, feldspar and calcite。The main element analysis of Jinduicheng molybdenum ore and Ruyang Donggou molybdenum ore is shown in Table 1。Table 1 Main element analysis results of Jinduicheng and Ruyang raw ore % Composition /% Mo Cu Pb S TFe CaO SiO2 Al2O3 North Jinduicheng Open pit 0.135 0.035 0.008 2.55 6.30 3.71 58.59 10.50 0 South Open air 0.093 0.054 0.013 2.06 3.97 0.88 83.94 2.96 0 One Ruyang East Ditch 0.14 0.003 6 0.005 2 0.25 5.98 5.36 61.99 7.49 S incubation ∫ 2 Overview of concentrator construction and expansion transformation 2.Jinduicheng Molybdenum mine was founded in 1958, 1966 ~ 1983 has been completed and put into operation a sorting plant, two sorting plant and three sorting plant, designed daily ore processing capacity 2.50,000t, annual output of molybdenum concentrate scalar 1.34 万t。 The first selection plant was completed and put into operation in September 1966, with a design scale of 500 t/d。 In accordance with the mine development strategy, the first processing plant was shut down for demolition in 1993。 The second selection plant was completed and put into operation in September 1971, with a design scale of 5 000 t/d。 After two expansions in 1973 and 1980, the second processing plant formed four grinding and roughing series, retaining the original one selection series, the design scale increased to 6 600 t/d, and the actual production capacity is now 8 000 t/d。 The three selection plant was completed and put into operation in November 1983, with a design scale of 1.50,000 t/d, 9 grinding and roughing series, 3 selected series。 In 1996, the three processing plant implemented production transformation, and in 2011, a new 10,000 t/d production line was built in the reserved site, and the actual ore processing volume is 3.20,000 t/d。2.2 Gold Molybdenum Ruyang construction overview In early 2004, Jinduicheng combined with other enterprises to acquire Ruyang Donggou Molybdenum mine, the establishment of gold molybdenum Ruyang company。 In December 2011, the gold molybdenum Ruyang 5 kt/d concentrator was completed and put into operation, and the current processing capacity has reached 6.2 kt/d [1]。 In June 2015, gold molybdenum Ruyang 20,000 t/d beneficiation plant was completed and put into operation, is currently working on the process of reaching production standards, after reaching production standards, the annual output of 57% molybdenum concentrate 1.320,000 t, 63% iron concentrate 14.52 万 t。3 Beneficiation process and technological progress 3.1 Change mixed flotation to preferred flotation，Laid the foundation for large-scale industrial production. The original design flotation process of the plant was molybdenum and sulfur mixed flotation (see Figure 1).，Mixed concentrate with sulfur suppression and molybdenum flotation，The separation and flotation tailings are sulfur concentrate，The final molybdenum concentrate was obtained by 1 stage regrinding and 8 times cleaning，The grade of molybdenum concentrate produced in that year was only 34% to 40%，Molybdenum recovery rate is 50% ~ 65%。 In June 1967, the mixed flotation was changed to molybdenum preferred flotation (see Figure 2), and the molybdenum concentrate grade reached 46.62%, recovery rate increased to 72.4%, this process has been modified or designed by secondary and tertiary concentrators [2]。Figure 1 Jinduicheng molybdenum mine mixed flotation principle flow chart 2 Jinduicheng molybdenum mine preferential flotation principle flow 3.2 Improve molybdenum concentrate grade technology，Molybdenum concentrate quality to reach the international advanced level in order to improve the competitiveness of molybdenum products，Enter the international market，In 1980, Jinduicheng first cooperated with Beijing General Research Institute of Mining and Metallurgy，In the first concentrator, the coarse concentrate concentration and dedusting are added, and the first stage regrinding cyclone is connected in series，Molybdenum concentrate grade increased from 46% to 51%，Miscellaneous items are also reduced。From 1981 to 1992, in cooperation with Xi 'an Metallurgical Research Institute and other units, with the assistance of West German experts, two additional stages of regrinding, so that the molybdenum concentrate grade reached 53%。