Copper tailings comprehensive recovery of scheelite, garnet, barite examples (Yongping Copper Mine)

YONGPING copper ore containing copper metal, sulfur-based, and associated with a plurality of gold, tungsten, silver, and other metal elements deposits. At present, the daily processing capacity of Yongping Copper Mine is up to 10,000 tons, and the tailings discharge is about 7000 tons. For the analysis of WO ₃ and S content in tailings, the monthly average grade is 0.064% and 2.28%, of which WO ₃ content fluctuation range is From 0.041% to 0.093%, about 2,000 tons of tungsten oxide is lost to tailings every year.

Copper Residue Copper YONGPING tungsten predominantly white tungsten output, followed by limonite ore containing tungsten, tungsten Chinese little, scheelite phase containing tungsten accounted for 82.05% of the total, brown iron minerals containing tungsten Between 0.14% and 0.18%. The scheelite is mainly composed of garnet, diopside , brown (erythr) iron ore, quartz , with a particle size of 0.076-0.25 mm, garnet with less than 6 μm of white tungsten, and limonite with tungsten is a highly dispersed phase of tungsten. . The main gangue minerals quartz and garnet, an amount of 32% mineral and 36%, respectively, also contains apatite and barite, these two minerals floatability and scheelite Similarly, increasing the flotation separation Difficulty. The scheelite has a fine particle size and the monomer separation is relatively late. It is unevenly distributed in thickness. The particle dissociation rate of 0.076 ~ 0.04mm is only 69%, and more than 80% of the living body is poor. The multi-element analysis and particle size analysis of tailings are shown in Table 1 and Table 2, respectively.

Table 1 Multi-element analysis (%)

Table 2 Particle size analysis

In order to comprehensively recover the white tungsten in the tailings, the plant adopts the process of re-election-magnetic separation-re-election-flotation-re-election (see Figure 1) for tailings re-election, that is, the first use of efficient spiral chute as coarse Selecting the main tailing equipment, abandoning 91.25% of the tailings, and further removing the magnetic minerals and garnet by high-efficiency magnetic separation equipment , reducing the tailings of the selected shaker to 4% to 5%, and maximizing the number of shakers. Only about 1% of the tailings left by the shaker enter the selected desulfurization operation, and finally obtain the tungsten concentrate with the WO ₃ content of 66.83% and the recovery rate of 18.01%, the sulfur concentrate with sulfur content of 42% and the recovery rate of 15%, and the pomegranate. Products such as zizi and barite are processed at 7000t per day, 330 days per year, and the total annual profit can reach 1.7 million yuan.

Figure 1 Heavy-magnetic-heavy-floating-heavy process