Yunfu Pyrite Mine is a large-scale open-pit mining joint enterprise with a designed scale of 3 million tons of raw ore per year, of which 1.5 million tons of lean ore is selected. The rich ore with a sulfur content of 36.75% is crushed to produce a product with a particle size of less than 3 mm.
1. Lean ore properties and beneficiation process
Yunfu Pyrite ores because the carbon, the color was black, brown, mainly useful minerals pyrite, marcasite followed, pyrrhotite, limonite, a small amount of sphalerite, yellow copper ore. Gangue minerals are quartz, calcite, sericite, carbon and the like. The ore structure is mainly strip-shaped, followed by block and disseminated.
The ore dressing plant is designed as a coarse crushing. The grinding is combined with wet self-grinding and lattice ball milling. The classifier uses Φ2 400mm high-grade double-screw classifier, flotation is a coarse two-precision two-sweep process, and sulfur concentrate is concentrated and filtered. The ore processing process and the pharmaceutical system of lean ore have been improved through several years of production practice, and the ore flotation process of lean ore is now changed to two coarse and one fine (Figure 4.5.7).
Figure 4.5.7 Guangdong Yunfu Pyrite Ore Poor Ore Dressing Process
The concentrating plant has a scale of 1.5 million t/a and a beneficiation ratio of 2.16. The conventional flotation agent, ethyl xanthate and 2# oil, has a sulfur concentrate of 40% and a recovery rate of 92.5%. The electricity consumption per ton of raw ore is 21.75kW·h. A rubber liner is used in the self-grinding mill .
2. Rich mine crushing plant
The process flow of the crushing plant is shown in Figure 4.5.8.
Figure 4.5.8 Process flow of Guangdong Yunfu pyrite ore-rich ore crushing plant
The scale of the rich ore crushing plant is 1.5 million t/a, the rich ore contains 36.75% sulfur, the crushing particle size is less than 3 mm, and the electricity consumption per ton of raw ore is 16.3 kW·h.
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