Sulfur ore beneficiation technology (1)

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The Mingxi pyrite mine in Datian County, Fujian Province is a skarn-type sulfur-containing polymetallic deposit filled with high and medium-temperature hydrothermal fluids. The scale of the mineral processing plant is to process 80,000 tons of raw ore annually. There are three main types of ore: Pyrite ore, lead-zinc pyrite and sphalerite ore. Pyrite ore: It is skarn mainly containing pyrrhotite, accompanied by small amounts of chalcopyrite, sphalerite and pyrite. Its gangue minerals are mainly garnet and diopside, followed by chlorite, tremolite, calcite and quartz. Lead zinc pyrite ore: The main metallic minerals of this type of ore are galena, sphalerite and pyrite ； Small amounts of chalcopyrite. Gangue minerals are quartz and calcite. The ore has a porphyry crushed structure, and chalcopyrite is a solid solution wrapped in sphalerite. sphalerite ore: The main metallic mineral is sphalerite, followed by pyrrhotite, pyrite and limonite, a small amount of chalcopyrite, and trace amounts of bornite. The gangue minerals are garnet, a small amount of diopside, chlorite, calcite and epidote. The physical properties of these three types of ores are listed in Table 1, and the particle size composition of the main minerals is shown in Table 2. Ore mining is carried out by tunnel mining and room-and-pillar mining methods. In the designed mine, the ratio of pyrrhotite to pyrite is: 2.67: 1. The size of the ore is less than 300 mm. The selected ore grades used in the design of the concentrator are divided into three types of ores and are listed in Table 3. Concentrate product designed for mineral processing, sulfur concentrate contains 35% sulfur ； Copper concentrate contains 15% copper. The output is 40,664 tons and 856 tons per year respectively. During the production process, due to changes in properties, the raw ores mined are copper-bearing pyrite and copper-bearing pyrrhotite. Therefore, in the early stages of production, a simple process of one rough selection and one sweep is used to recover only pyrite. When the sulfur content of the raw ore is 15~17%, the sulfur content of the obtained concentrate is 32~35%, the recovery rate is 85~90%, and the copper is not recovered. Official copper recycling began in 1982. When the selected raw ore contains 17.09% sulfur and 0.25% copper, the sulfur concentrate grade is 32.73% and the copper concentrate grade is 14.52%. At present, the production of the processing plant has become normal, and the daily processing volume of raw ore has reached the designed scale. The process flow and main equipment used in the mineral processing plant are described below.: Broken section: Adopt two stages and one closed circuit crushing process. See Figure 1. Use PEF400 for coarse crushing * 600 jaw crusher ； Single rotor ф1000 is selected for medium crushing. * 700mm impact crusher ； The screening equipment is SZZ900 * 1800 mm self-centering vibrating screen with a mesh opening of 13 mm and a product particle size of 11 to 0 mm. For more detailed information, please log in to the China Mineral Processing Technology Network http://www.mining120.com