Comprehensive recovery of polymetallic antimony sulfide ore

With industrial development, the increasing world consumption of antimony, antimony production China is a big country in the world, 70 percent of the world's antimony production in China. Antimony is always present together with other minerals, mineral resources of antimony, a multi-metal antimony sulfide ore is one of the most important of the antimony ore resources, the higher its overall value, but often more difficult to choose. According to different ore properties, it is of great significance to study the corresponding recycling process to make full use of such mineral resources.

A mine belongs to quartz and fluorite -type vein-like strontium tungsten deposits. The main valuable elements in the ore are strontium, tungsten, lead , arsenic and associated metallic silver . Antimony, lead, silver and arsenic are mainly sulfide minerals, but the monomeric silver sulfide mineral has a fine particle size. The main carrier mineral of silver is galena, and tungsten is mainly scheelite and wolframite . In order to develop the mineral resources, the ore properties, beneficiation process and process conditions were tested. The test uses partial mixing) separation flotation to recover bismuth, silver, lead and arsenic in sulfide ore, flotation tailings and re-selection) magnetic separation process to recover tungsten. The test results are as follows: 锑 concentrate contains 锑56.27 %, 锑 recovery rate of 77.92%, silver-lead mixed concentrate containing lead 26.63%, lead recovery rate of 61.34%, silver 2500g ∕t, silver recovery rate of 68.84%, arsenic concentrate containing arsenic 10.31%, arsenic recovery of 83.09%, tungsten concentrates containing WO ₃ 9.28%, the recovery rate 74.77% tungsten.

First, the nature of the ore

(1) Mineral composition and chemical composition of ore

The minerals contained in the ore are numerous and complex. Metallic minerals stibnite, antimony luminance iron, arsenopyrite, galena, pyrite, scheelite, wolframite mainly containing a small amount of iron sphalerite, antimonial lead, bournonite like; The gangue minerals are quartz, calcite and fluorite. The results of multi-element chemical analysis of raw ore are shown in Table 1.

Table 1 Results of multi-element analysis of ore /%

(II) Phase analysis and single mineral analysis of major minerals

The results of phase analysis of strontium and tungsten minerals are shown in Table 2. The chemical analysis results of single minerals of stibnite, feldspar, galena and scheelite are shown in Table 3.

Table 2 Results of bismuth and tungsten phase analysis /%

Table 3 Single mineral chemical analysis results /%

Second, sulfide ore recovery

The sulphide ore flotation has chosen a partial mixing process that takes full advantage of the natural flotation of the mineral itself. Firstly, the lead-containing, silver minerals with a good floatability and a small part of the aflatrons with good floatability are floated, and then the activator is added to activate the strontium minerals such as stibnite and then float with the part of the poisonous sand which is difficult to float. Start. The silver-lead coarse concentrate and the bismuth and arsenic concentrates are separated from silver and lead, arsenic and antimony, respectively. After selection, silver-lead mixed concentrate, antimony concentrate and arsenic concentrate are obtained. The sulphide ore flotation process is shown in Figure 1. The process conditions for each flotation operation are shown in Table 4. The flotation test results are listed in Table 5.

Figure 1 Sulfide ore flotation test process

Table 4 Sulfide ore flotation reagent conditions

Table 5 Sulfide ore flotation test results /%

It found during the test using butyl xanthate complex with a silver diethyldithiocarbamate lead flotation collector, and a black-butylammonium drugs and drugs as compared with black-butylammonium fourth ammonium phosphate complex, silver, lead and coarse and fine The grade and recovery rate of silver and lead in the mine are both high. Because of the presence of bismuth-bearing and lead-bearing minerals such as strontium-lead ore and wheel ore in the ore, and the content of lead in these minerals is higher than that of strontium, the lead content in strontium concentrate is higher.

Third, the recovery of tungsten

The ore flotation tailings contain WO ₄ 0.24%, of which scheelite accounts for 74.47% and black tungsten ore accounts for 25.53%. In order to comprehensively recycle it, a reselection magnetic separation device has been specially developed. The device does not require power, has a large processing capacity, a high enrichment ratio, and a low beneficiation cost, and is particularly suitable for recovering scheelite and wolframite from a sulfide ore flotation tailings having a lower tungsten content. The device was used to treat the sulfide ore flotation tailings according to the process of Fig. 2, and the test results are shown in Table 6.

Figure 2 Tungsten recycling process

Table 6 Tungsten recovery test results /%

Fourth, the conclusion

The ore samples in this study contain various metals such as antimony, lead, silver, arsenic, tungsten, zinc and copper . There are many kinds of minerals in the ore. The metal minerals include stibnite, pyrite, ore, pyrite, pyrite. Aromatic sand, scheelite, wolframite, iron sphalerite, sulphide ore, wheel ore, sulphide iron ore, silver, beryllium copper and chalcopyrite; gangue minerals are quartz, calcite, fluorite Wait. According to the content of metal minerals in the ore and its industrial value, it should be mainly based on recycled strontium, and comprehensively recover metals such as silver, lead and tungsten. The test shows that the samarium, lead, silver and arsenic in the sulphide ore are recovered by partial mixing) separation process. The sulphide ore flotation tailings are mainly used for re-election to recover tungsten, and bismuth concentrate and silver-lead mixed concentrate can be obtained. , arsenic concentrate and tungsten trioxide coarse concentrate a variety of products. Moreover, since the flotation of sulphide ore fully utilizes the floatability of minerals, tungsten recycling utilizes efficient roughing equipment, which makes the whole recycling process technology reliable, stable in operation, good in separation effect, and more suitable for production applications. Since the ore contains high arsenic (1.02%), it is necessary to separate arsenic from lead, lead, silver and other metals, especially the separation of arsenic from arsenic. The sodium sulfite separation scheme used in this experiment has solved the problem of arsenic separation.

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