I. Introduction
Cotton soil nest tungsten tungsten ore is based, there are associated bismuth, molybdenum, copper and other metals polymetallic mine, have been normal production for 36 years. At present, the selected grades of the selected plants are WO 3 0.7%, Bi 0.11%, and Mo 0.10%. The beneficiation process is mainly re-election, and the fine mud is obtained by flotation method.
In the process of shaking machine selection, due to the coarse grain size and insufficient dissociation degree, there are also factors such as natural hydrophobic floating, which causes some strontium and molybdenum minerals to be lost in the tailings of the shaker. In the past decades, the recovery rate of antimony and molybdenum has only been about 30%. At present, some technical measures have been taken in production to strengthen the recovery of antimony and molybdenum. The recovery rate of antimony and molybdenum has been greatly improved, but still only 40% to 50. %. As the middle section of the mining development moves down, the ore and molybdenum grades of the ore will increase, and the metal loss of tantalum and molybdenum in the tailings of the shaker will increase. To this end, the ore dressing test study on the recovery of bismuth and molybdenum from the tailings of the shaker was carried out, and good results were obtained.
Second, the shaker tail sand mineral sample
The analytical grade of the ore sample is é“‹0.08% and molybdenum 0.041%. The particle size analysis results are shown in Table 1. The results show that the distribution of bismuth and molybdenum in each particle size is relatively uniform. Only the grade of bismuth and molybdenum in the -0.074mm grain size is significantly higher, but the metal and molybdenum metal occupation rates are only 4.54% and 3.82%, respectively. The content of +2mm is 1.54%, and the occupation ratio of bismuth and molybdenum metal is 1.79% and 1.34%, respectively. The yield of -1.0+0.074mm is 77.12%, and the occupation ratio of bismuth and molybdenum metal is 71.44% and 77.13%, respectively, which is the main fraction of metal distribution.
Table 1 Results of particle size analysis of shaker tailings
Third, no longer grinding program
The Miantuwo tungsten deposit is a gasification high temperature fissure filled with black tungsten quartz veins, and the veins are mainly produced in granite . The main metal minerals in the re-selected tailings of the shaker are black tungsten ore, followed by chalcopyrite, molybdenite, stibnite, sulphide ore, bismuth and cassiterite : non-metallic minerals are quartz, topaz , and Stone , fluorite and calcite . Bismuthinite disseminated with irregular distribution, chalcopyrite, sphalerite, even the living vein, bismuthinite easily oxidized bismuth secondary mineral bismuth China, and the surface covering portion bismuthinite bismuth China. The molybdenum ore is embedded in the gangue in the form of flakes or granules, and the natural floatability is very good. The results of grain size analysis show that the distribution of bismuth and molybdenum is uniform in each grain size, and it is impossible to discard a certain grade by grading method, but the occupancy rate of -1.0mm grain size reaches 78.65%, and the occupation ratio of bismuth and molybdenum metal respectively reaches 75.98%, 80.94%, the grade is suitable for flotation. If you do not consider re-grinding, there are two solutions: one is to directly perform the flotation flotation on the tailings of the shaker; the other is to classify the tailings of the shaker, and return the +1.0mm fraction to a section of the rod mill, -1.0mm The stage is used for slurry flotation. The advantage of the first scheme is that it is easy to implement and the operating cost is also low, but the recovery rate of molybdenum is very low, and the crucible can hardly be recovered. The direct flotation test results after classification are shown in Table 2. The recovery rate of molybdenum is only 21.79%, and the recovery rate of rhodium is only 5.85%. The advantage of the second scheme is that the investment is very small and the process is easy to reform. It is expected that the recovery rate of bismuth and molybdenum will be improved, but the scheme is likely to cause a large amount of rod grinding load to be too large, and the final effect cannot be determined. Investigate the implementation effect, because the scheme is relatively easy to implement in industrial production, and industrial tests are recommended when conditions permit.
Table 2 Direct flotation test results after classification
Fourth, re-grinding scheme
The size of the tailings of the shaker is coarse, and the dissociation degree of useful minerals is not enough. It is not suitable to use the flotation method to recover bismuth and molybdenum. In order to solve the problem of strontium and molybdenum recovery in the tailings of the shaker, it is necessary to carry out re-grinding flotation. This experiment mainly explores the feasibility of re-grinding flotation to recover bismuth and molybdenum from the tailings of the shaker.
It can be seen from the results of the grinding fineness test that the grinding grain size is finer and the index is better. Since the tailings pond of the cotton-sand tungsten mine has greatly exceeded the designed storage capacity, it is necessary to consider that the tailings can be easily sorted out after being re-elected, and sold to the nearby building materials factory as the raw material for the manufacture of sand bricks. For the re-recycling of tailings, the ore dressing cost should be reduced as much as possible, so the regrind fineness is selected to be -0.074mm, which is 45%.
(1) Rough selection of collector test
1. Collector test
Selection kerosene, Y89 xanthate, butyl xanthate, tetrabutylammonium aerofloat agents BK-60 and the new comparison test as a collector, the results shown in Table 3. The results showed that the index obtained by using butylammonium black drug and new drug BK-60 was better, and the index obtained by using kerosene and Y89 xanthate was the second, and the index obtained by using Dinghuang was poor.
Table 3 Test results of collector types
2, the method of adding collectors
The flotation effect of butylammonium black drug and new drug BK-60 is better. Although the kerosene flotation effect is not as good as that of butylammonium black drug and BK-60, it is also good. The three collectors have their own characteristics. The kerosene has weak trapping ability and strong defoaming effect; the butylammonium black drug has strong competing power with respect to kerosene, and has strong foaming performance in weakly alkaline medium; the new agent BK-60 has better harvesting power than kerosene. It is much stronger, weaker than butylammonium black, and slightly defoaming. In view of the nature of these three kinds of collectors, kerosene and new agent BK-60 were added to the ball mill respectively, while coarse selection and coarse selection were added to the butylammonium black drug, so that the rough selection and the rough selection were A more stable foam layer. The test results are shown in Table 4. It is reasonable to add BK-60, rough selection and rough selection to the butyl ammonium black medicine in the ball mill. Considering the use of butylammonium black medicine as the collector at present, it is recommended to use the new test. The agent BK-60 and butylammonium black drug are used as collectors.
Table 4 Test results of collector addition method
(2) Rough selection adjuster test
Lime was added as a modifier to the ball mill for testing. Considering that a large part of the strontium contained in the tailings existed in the form of cerium oxide, the effect of adding a small amount of sodium sulfide on the flotation was investigated. Lime or sodium sulfide was added to the mill, and the collector BK-60 was also added by ball milling. The crude selection and the crude selection of butylammonium black were added. The test results are shown in Table 5. The results show that the addition of lime and sodium sulfide in the ball mill is beneficial to the recovery of ruthenium, but the addition of sodium sulphide is unfavorable for the recovery of molybdenum. Therefore, it is determined that 500 g of ∕t lime is added to the ball mill as a coarse adjustment agent.
Table 5 Test results of rough selection adjuster
(3) Strengthening the election test
1. Vulcanization test
Since a large part of the barium in the tailings of the shaker is cerium oxide, the recovery test is carried out by a vulcanization flotation method. The foregoing results indicate that the addition of sodium sulfide is disadvantageous to the recovery of molybdenum in a ball mill, so that sodium sulfide cannot be added to the ball mill, and the sodium sulfide is added and reselected after the rough selection operation, and the flotation time is too long. In order not to make the flotation time of bismuth and molybdenum too long, sodium sulfide was added during the roughing three operations, and the flotation time of the roughing three operations was increased from 5 minutes to 8 minutes. The test procedure is shown in Figure 1, and the test results are shown in Table 6. The results show that the vulcanization flotation has obvious effect on the recovery of strontium. When the sodium sulfide 1000g ∕t and the dicofing agent 30g ∕t are added in the rough selection operation, the coarse selection index of bismuth and molybdenum is the best, and the bismuth and molybdenum grades can be obtained respectively. It is 1.36% and 1.11%, and the recovery rate is 58.08% and 92.29% of mixed coarse concentrate respectively.
Figure 1 Flotation test procedure for vulcanization
Table 6 Test results of vulcanization
2. Concentrated dehydration test
The cerium oxide has poor planktonicity. In order to strengthen the flotation of cerium oxide, the crude two tails are dehydrated and then lime (200g ∕t) and sodium sulfide (1000g ∕t) are added. The test results are shown in Table 7. The test index of concentrated dehydration-enhanced electrification has not improved much. It is preliminarily indicated that re-pulping after concentrated dewatering does not significantly improve the recovery rate of antimony.
Table 7 Dehydration-enhanced selective test results
(4) Selection and exploration of mixed coarse concentrates
Taking into account the development and utilization prospects of the tailings, a selective exploration experiment was carried out on the bismuth-molybdenum mixed coarse concentrate. Due to the low grade of strontium and molybdenum in the tailings, the oxidation rate of strontium is very high, the amount of coarse concentrate is very small, and it is impossible to carry out multiple selective tests. The selected tests only obtained bismuth and molybdenum grades of 23.56% and 19.71 respectively. % bismuth-molybdenum mixed concentrate.
V. Conclusion
(1) The results of particle size analysis show that the distribution of bismuth and molybdenum in each particle size is relatively uniform, only -0. 074mm grain size bismuth, molybdenum grade is significantly higher, but its bismuth and molybdenum metal occupation rate are only 4.54%, 3.82%, respectively. , can not discard a certain level with a hierarchical method.
(2) Direct flotation of -1.0mm size in the tailings of the shaker, the recovery ratio of bismuth and molybdenum is 5.85%, 21.79% and the grades are 3.79% and 7.50%, respectively. The direct flotation effect Very poor. After classifying the +1.0mm fraction and returning to a rod mill, it is expected that the recovery effect of niobium and molybdenum will be improved. Since the scheme is relatively easy to implement in industrial production, industrial tests are recommended when conditions permit.
(3) The grinding fineness is selected to be -0.074mm, accounting for 45%. The new chemical BK-60 and the vulcanization flotation process are adopted. The open-circuit test results in the yields of bismuth and molybdenum of 1.36% and 1.11%, respectively, and the recovery rates are 58.08%. 92.29% mixed coarse concentrate. However, due to the low grade of tailings, the amount of mixed coarse ore concentrate obtained is small, and it is impossible to carry out multiple selections. The open-circuit selective test can only obtain the bismuth-molybdenum mixed concentrate with bismuth and molybdenum grades of 22.56% and 19.71% respectively. .
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