Pyrrhotite type Ore mining is a flat mining, room and pillar mining method. In the design of the mining, the ratio of pyrrhotite to pyrite is: 2.67:1. The ore block is less than 300 mm. In the production process, due to the change of nature, the raw ore produced is copper-bearing pyrite and copper-bearing pyrrhotite. Therefore, in the initial stage of production, a rough process and a simple process of sweeping are used to recover only ferro-iron. mine. When the ore contains 15 to 17% sulfur, the concentrate contains 32 to 35% sulfur, and the recovery rate is 85 to 90%. Copper is not recovered. Formal recycling of copper has been in place since 1982. When the ore was selected to contain 17.09% sulfur and 0.25% copper, the grade of sulfur concentrate was 32.73% and the grade of copper concentrate was 14.52%. At present, the production of the selected plant has become normal, and the daily processing of raw ore has reached the design scale.
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Daejeon Daejeon County, Fujian Province Ming concentrator pyrite pyrite River, is a tall, mesothermal filling and replacement skarn sulfur-containing metal deposit. Beneficiation plant scale processing of raw ore 80,000 tons. There are three main types of ore: pyrite, lead-zinc ore pyrite and sphalerite.
Pyrite: containing mainly pyrrhotite skarn, a small amount of associated mineral brass, sphalerite and pyrite. Its gangue minerals are mainly garnet and diopside , followed by chlorite, tremolite , calcite and quartz .
Lead-zinc-pyrite ore: The main metal minerals of this type of ore are galena, sphalerite and pyrite; a small amount of chalcopyrite. The gangue minerals are quartz and calcite. The ore is in a punctate crushing structure, and the chalcopyrite is solid solution and is encapsulated in sphalerite.
Sphalerite ore: The main metal mineral is iron sphalerite, followed by pyrrhotite, pyrite and limonite, a small amount of chalcopyrite, and trace copper. The gangue mineral is garnet, a small amount of diopside, chlorite, calcite and epidote.
The physical properties of these three types of ore are listed in Table 1, and the particle size composition of the main minerals is shown in Table 2. 
The ore grades used in the design of the concentrator are classified according to three types of ore and are listed in Table 3. Concentrate products designed for ore dressing, sulfur concentrate contains 35% sulfur; copper concentrate contains 15% copper. The output is 40,664 tons and 856 tons per year respectively.
The process flow and main equipment used by the concentrator are as follows:
Broken section: It adopts two sections and one closed circuit crushing process. see picture 1. The coarse crushing machine adopts one PEF400*600 jaw crusher ; the middle crusher adopts single rotor Ñ„1000*700mm impact crusher ; the screening equipment is SZZ900*1800mm self-centering vibrating screen, the mesh hole is 13mm, the undersize product Particle size 11~0 mm.