2. Yunfu pyrite sulfur iron ore beneficiation plant is located in Yunfu, Guangdong Zhaoqing, Yunfu County. It is a large-scale open-air mining and selection joint venture. The designed scale is 3 million tons of raw ore per year, of which 1.5 million tons of poor ore is selected, and a scale-poor ore dressing plant of the corresponding scale is built, which can produce 604,000 tons of sulfur concentrate powder with 40% sulfur grade per year; The crude oil with a sulfur grade of 36.75% is 1.5 million tons. It is processed by the rich ore crushing plant to obtain products with a particle size of less than 3 mm. The total amount of the two ore is equivalent to a sulfur ore 23 & standard ore of 2,368,000 tons per year.
The mine is a huge sedimentary metamorphic hydrothermal enrichment deposit. It has the largest reserves and the highest sulfur content in China's proven pyrite deposits. The ore bodies are buried shallowly and are relatively concentrated, with good mining conditions. The mining service within the design scope can last for 45 years.
The mining method is open-pit mining-car transportation development. The average stripping ratio is 2.6; the production stripping ratio is 0.8; the mining loss rate and the depletion rate are both 5%. The mined piece is 1000 mm.
Yunfu pyrite ore is grayish black and black due to its carbon content. The ore structure is mainly strip-shaped, followed by block and dip-dyed. Useful minerals are mainly pyrite, marcasite followed, pyrrhotite, limonite and a small amount of sphalerite, yellow copper ore. Gangue minerals quartz, calcite, sericite, primarily carbonaceous, still a very small amount of clay, sphene, zircon, and fluorite.
Design of the lean ore dressing plant According to the results of the ore dressing test, a large number of medium and low grade pyrite ore deposits in the mining area were designed for the lean ore dressing enrichment process. This part of the lean ore is mainly concentrated in the upper part of the mining area of ​​the mine, and all the ore produced is selected.
The designed beneficiation process is:
Crushed mine: a rough process;
Grinding: The combined process of wet self-grinding and lattice ball milling. The second section of grinding with a Ñ„ 2400 mm sorghum double helix splicing machine;
Flotation: adopt a rough, two sweep, two fine flotation process;
Dehydration: The two-stage dewatering process is concentrated and filtered.
The detailed production process is shown in Figure 6. The main process equipment of the concentrator is summarized in Table 7.
The design and design of the rich ore crushing plant adopts three-stage open-circuit crushing, rod grinding and classifier high-concentration returning sand to obtain a coarse-grain concentrate product with a yield of 40%. The classifier overflows and concentrates to obtain a fine particle with a yield of 60%. (particle size is 0.2~0.3 mm) concentrate product. The process flow is shown in Figure 7. The main equipment used is shown in Table 8.
Comprehensive technical and economic indicators lean ore dressing plant: scale 1.5 million tons / year; dressing ratio 2.16, sulfur concentrate output 694,000 tons / year, (initial selected grade is 14.8%, the output is 526,000 tons / year), sulfur The mine contains 40% sulfur and 92.5% sulfur concentrate recovery rate; the power consumption per ton of raw ore is 21.7 degrees.
Rich ore crushing plant: the scale is 1.5 million tons / year; the rich ore crushing particle size is less than 3 mm; the rich ore contains 36.75% sulfur; the rich ore crushing processing fee is 3.14 yuan / ton of raw ore; the electricity consumption per ton of raw ore is 16.3 degrees.
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