Study on Comprehensive Recovery Process of Tungsten Sulfide Ore Tailings in Beikeng Tungsten Mine
Fujian Province is rich in resources of tungsten ore, tungsten trioxide total reserves ranking fourth in the country, and associated a large number of molybdenum, bismuth, copper and other metals useful in sulphide minerals. For a long time only tungsten ore dressing plant recovery of sulfide minerals associated recovery has not taken comprehensive measures. The Qingliu Beiteng tungsten mine discharges a large amount of tungsten-sulphide ore tailings every year, which causes pollution of the environment and pollutes the environment. In order to rationally develop and utilize mineral resources, improve the economic benefits of mines, and reduce environmental pollution, we conducted a comprehensive recovery process study on the selected tungsten ore sulfide tailings of the Beikeng tungsten mine. Through the comparison of the test schemes of the three process schemes and the test of the pharmaceutical conditions, a good sorting index was obtained by adopting the equivalent floatable process flow.
First, the nature of the ore
(1) Mineral composition
Ore to metallic minerals pyrite, bismuthinite, molybdenite, chalcopyrite, pyrite shaped hematite - limonite mainly, a small amount of black copper, bismuth bubble, pyrrhotite iron - erythro limonite, sphalerite, galena, chalcocite and traces of wolframite, arsenopyrite and the like. Non-metallic mineral quartz, potassium feldspar, plagioclase, mica-based white, fluorite, sericite, zoisite, epidote, etc. followed. The multi-element chemical analysis and mineral content of the ore are shown in Tables 1 and 2.
Table 1 Results of multi-element chemical analysis of raw ore ∕%
Table 2 Mineral content of ore ∕ %
(2) Main mineral characteristics and continuous relationship
1. Huiyan Mine. Most of them are semi-self-shaped columnar crystals, and some of them are fine-grained aggregates which are connected with quartz, molybdenite and chalcopyrite.
2. Bubble ore. It is irregularly shaped like a granular or aggregate. It is a watch product of stibnite. It can be seen that it is closely associated with the two, and it is closely related to quartz and iron oxides.
3. Chalcopyrite. Most of them are nearly equiaxed in the shape of crumbs, and a small part is a dense aggregate of fine particles. It is mostly symbiotic with quartz and pyrite. It is also known to be symbiotic with sphalerite and continuous with stibnite.
4. Black copper ore. Soily debris. Often produced with chalcopyrite, some distributed in the surface of chalcopyrite or its micro-cracks, is an epigenetic mineral formed by the oxidized zone or groundwater along the (micro)fracture system acting on the primary ore.
5. Copper ore. Dense blocky, and some are associated with chalcopyrite, which may be superficial.
6, molybdenum ore. A hexagonal plate-like sheet is presented. Part of the scale-like aggregate, symbiotic with the stibnite, it can be seen that it partially wrapped the latter, and the muscovite is born. In addition, it is also associated with pyrite.
7. Pyrite. The self-formed, semi-automorphic crystals and their crumbs, which are hexahedron, dodecahedron and both, are almost symbiotic or associated with various sulfides seen in this ore sample. Some pyrites are converted to hematite and limonite in different degrees.
Second, the beneficiation test
(1) Determination of the principle process
Since the sulfide ore tailings have been treated with chemicals during tungsten selection, sodium sulfide is used for desorption and desorption, and a section of grinding is performed to -74 μm, which accounts for 80%.
It can be seen from the study of the ore properties that the sulfide ore tailings have many kinds of useful minerals and the composition is complicated, and the copper and antimony minerals have been oxidized to some extent. According to the floatability characteristics of minerals, molybdenite has good floatability and should be preferentially floated. The copper and bismuth minerals are similar in floatability, and some of the chalcopyrite and stibnite also have good floatability and are easy to enter molybdenum concentrate products. If single-priority flotation is used, a large amount of inhibitor is added to inhibit copper and antimony minerals, and then a large amount of activator is added for long-term activation. If full-mix flotation is used, the copper and antimony minerals in the mixed concentrate are difficult to separate due to the adsorption of the agent on the surface. In order to avoid the above two cases, it is decided to conduct comparative tests of three process schemes: molybdenum, beryllium copper, molybdenum, copper matte and the like. The test results are shown in Table 3. The results showed that:
1. The flotation process of molybdenum and beryllium copper. In the flotation of molybdenum rhenium, although sodium cyanide was used to suppress copper, 56.73% of copper entered the molybdenum rhenium concentrate. Although copper was added for activation when copper was selected, 40.44% of copper remained in the tailings. Therefore, it is difficult to obtain an independent copper concentrate in this process.
Table 3 Principle Process Test Results
2, molybdenum, copper _ é“‹ flotation process. In the floatation of molybdenum and copper, sodium sulfite is required to suppress the strontium minerals, but the strontium minerals are difficult to activate after being inhibited, causing 56.98% of the strontium to enter the tailings and cannot be recovered.
3. Wait for the float process. In the flotation of molybdenum and copper, the inhibitor of the strontium mineral is not added, so that some of the easy-floating strontium minerals and the molybdenum-copper concentrate are simultaneously floated out and then separated, so as not to affect the flotation of the later difficult-to-float minerals. The metrics of the process are better than the first two processes, so the process is determined to be a principle process.
(2) Flotation condition test
1, Mo-Cu agents roughing conditions determined lime 800g / t, coal oil 450g / t, ADDP 60g / t by orthogonal test. Separation of molybdenum _ and copper bismuth was carried out by using sodium sulfite as an inhibitor of bismuth mineral, and it was determined by experiment to be 800 g 石ç°t of lime and 3000 g 亚t of sodium sulfite. Molybdenum-copper separation uses sodium sulfide as an inhibitor of copper minerals. The amount determined by the experiment is 6000g∕t, and the amount of molybdenum is 3000g∕t.
2. The crude drug selection conditions were determined by orthogonal test to be 300g∕t of Dinghuangxuan, 1200g∕t of zinc sulfate, 200g∕t of sodium cyanide, 30g∕t of 2 # oil, and a small amount when sweeping Ding Huang Yao.
3. After sweeping, add 600 g of sulphuric acid to adjust the pH value, add 800 g of sulphate, 300 g ä¸t, 2 #æ²¹ 24 g∕t, and perform sulfur flotation.
The final closed-circuit test procedure is shown in Figure 1, and the test results are shown in Table 4.
Figure 1 closed circuit test process
Table 4 Closed circuit test results
Note: The content of Ag is ×10 -6 .
Third, the conclusion
(1) For the separation of complex polymetallic sulphide ore such as the tailing tungsten ore quenching ore tailings, the use of a floatable process is a preferred solution. The difference in the floatability of the mineral itself can be fully utilized, the dosage of the agent can be reduced, and the adsorption of the agent on the surface of the mineral can be reduced, and the phenomenon that it is difficult to be activated later can be suppressed, and a good sorting index can be obtained.
(II) This process research is aimed at the comprehensive recovery of tungsten ore sulfide tailings from Beiteng tungsten ore. It also has certain reference and reference for the comprehensive recovery of the same type of ore in other mines in the province.
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