Examples of recovery of tungsten, tantalum and molybdenum from tungsten tailings

Cotton soil nest is tungsten tungsten ore containing tungsten copper bismuth-based multi-metal deposit molybdenum, tungsten tailings after magnetic separation gross sand soil in cotton nest of tungsten ore sorting tungsten per year generated (processing plant shaker get, The tailings after lifting and desulfurization and magnetic separation of tungsten include Bi20%, WO ₃ 10%-20%, Mo1.45%, SiO ₂ 30%-40%, and niobium minerals are natural niobium and tantalum oxide. bismuthinite too small amount of sulfur and bismuth copper, pyrite, molybdenite, limonite and quartz, topaz and the like. The microscopic identification shows that the tungsten-strontium minerals are more connected to each other, and the tungsten minerals are also associated with chalcopyrite, limonite and gangue. It is also found that the stibnite is encapsulated in the black tungsten ore particles, which is extremely difficult to achieve. Dissociation. The particle size composition and monomer dissociation measured by tailings sampling are shown in Table 1 and Table 2. It can be seen from the table that the yield of +0.074 mm in the sample still accounts for 75.55%, and the three main minerals are also mainly distributed in the particle size of +0.074 mm.

Table 1 Sample size analysis results

Table 2 Determination of sample monomer dissociation

According to the small test results, the plant uses the re-election-flotation-water-smelting combined process (see Figure 1) to process the magnetic separation tailings and comprehensively recover tungsten, tantalum and molybdenum. Considering that the silicon content in the magnetic separation tailings is as high as 30% to 40%, which far exceeds the silicon-containing standard of the antimony concentrate (less than 8%), the desiliconization is reselected by shaker before re-election. After the fine ore is graded by grinding, it enters the flotation operation, first floating molybdenum and sulphide sulphide, and then floating floating yttrium oxide; in order to further recover the particulate cerium minerals and strontium minerals in the flotation tailings, The obtained flotation tailings (tungsten concentrate) are leached at normal temperature, and then substituted to obtain a qualified niobium product and the remaining tungsten coarse concentrate product. Production practice shows that the strontium sulfide concentrate and bismuth oxychloride with strontium content of 36% and 71% respectively can be obtained by this process. The total recovery of strontium is as high as 95%, and 36% of tungsten is contained, and the recovery rate is 90%. Tungsten coarse concentrate, which improves the total recovery rate of the tungsten plant by 2%

Figure 1 é“‹Tungsten comprehensive recycling process