Tungsten metal tin ores minerals are wolframite, cassiterite small amount, scheelite, tungsten China, magnet ore, hematite, limonite, and a very small amount of pyrite, copper ore . Gangue minerals are quartz, white mica, feldspar followed, and a small amount of fluorite, calcite, tourmaline, biotite. The black tungsten ore has a coarser grain size in the ore. Guantong et al. used a heavy-magnetic combined process to first obtain a tungsten-tin coarse concentrate by re-election, and then use magnetic separation to separate tungsten-tin. When the ore grade is 0.40% WO3, 0.12% Sn, a good index of tungsten concentrate grade 65.03% WO3, recovery rate 79.74% and tin concentrate grade 39.32% Sn, recovery rate 53.30% can be obtained.
Xiao Lin day based on a nature of the ore characteristics Ore Hunan, using pre floating sulfide ore, sulfur tailings normal float floating scheelite scheelite flotation concentrate the crude acid-leachable phosphorus qualified output scheelite; scheelite The flotation tailings are coarsely selected and enriched by spiral chutes, and the process of selecting tin concentrates by picking shakers is selected. For the ore containing 0.617% WO3, 0.043% Sn, the tungsten concentrate grade 65.65% WO3, the recovery rate of 85.09% scheelite concentrate, the tin grade 28.20%Sn, the recovery rate of 25.95% tin concentrate, white Both tungsten and cassiterite are effectively recovered.
A tungsten-tin ore mine in Hunan is an extra-large contact skarn deposit. The industrial type is a Yunyingyan-skarn composite tungsten-tin polymetallic deposit with a tungsten grade of 0.10% WO3 and a tin content of 0.47% Sn. The main useful minerals of the mine are black tungsten ore and cassiterite. The tungsten-tin and gangue in the ore sample are closely related to each other and are densely inlaid; the mineral inlay has fine grain size. Zhuang Dujuan et al. used flotation and weak magnetic separation to remove sulphur-containing iron ore. The desulfurization tailings were separated by magnetic separation to obtain magnetic minerals and non-magnetic minerals. The magnetic minerals continued to be obtained through the “floating-magnetic-heavy†joint process. Tungsten concentrate 1, non-magnetic minerals obtained by demineralization and "heavy-floating" combined process to obtain tungsten concentrate 2 and tin concentrate, obtained tin concentrate containing tin 50.44% Sn, tin recovery rate of 47.29%; containing tungsten 41.83% WO3, tungsten recovery of 25.10% tungsten concentrate.
A tungsten-tin ore in Yunnan contains 0.323% WO3 and 0.140% Sn. Wei, etc. On the basis of the experimental study and the ore mineralogy process using grinding section to -0.5 mm, shaking for roughing, desulfurization mixed concentrate, iron, tungsten normal flotation separation beneficiation process tin, tungsten is obtained Concentrate yield 0.31%, tungsten grade 71.06% WO3, tungsten recovery rate 67.69%, tin 0.56% Sn; tin concentrate yield 0.12%, tin grade 58.18% Sn, tin recovery 50.94%, tungsten 3.80%, tin rich The yield of medium ore is 0.21%, the tin grade is 4.22%Sn, the tin recovery rate is 6.87%, the tungsten content is 2.69% WO3, and the comprehensive tin recovery rate is 57.81%.
(2) Comprehensive recovery of copper-tungsten ore
Copper-tungsten ore generally adopts the principle process of selecting copper and sulfur and then selecting tungsten. There are three types of flotation processes for copper-sulfur ore: 1 preferential flotation, 2 mixing-separation flotation, and 3 semi-preferred mixing-separation flotation. Tungsten beneficiation uses re-election, flotation or a combined process depending on the nature of the ore.
The useful minerals in a copper-tungsten ore are chalcopyrite and porphyrite. The associated minerals are mainly pyrite and a small amount of scheelite, wolframite and silver . Zhou Yuan et al. used preferential flotation copper according to the nature of the ore, combined collector 731+ oleic acid and water glass as inhibitors for flotation of white tungsten, and white tungsten coarse concentrate for heating, containing 0.97% Cu, 0.74% WO3. The copper concentrate grade is 18.35%, the copper recovery rate is 94.64%, the white tungsten concentrate grade is 60.35 % WO3, and the white tungsten recovery rate is 76.41%.
A copper-sulfur-tungsten polymetallic ore in Jiangxi is a large skarn-type scheelite deposit in China. The ore contains 0.11% Cu, 2.95% S, and 0.75% WO3. The main metal minerals are chalcopyrite, pyrrhotite and white. Tungsten. Ling Shisheng uses magnetic separation desulfurization-copper-sulfur mixed flotation-white tungsten flotation process to produce sulfur concentrate, copper concentrate and scheelite concentrate. The closed-circuit test indicators obtained are: sulfur concentrate containing 30.16% S, The recovery rate is 77.58%; the copper concentrate contains 18.28% Cu, the recovery rate is 76.83%; the scheelite concentrate contains 66.04% WO3, and the recovery rate is 81.67%.
A copper-tungsten ore in Jiangxi contains 0.74% Cu, 0.078% WO3, 18.69g/tAg. The main metal minerals are chalcopyrite, pyrite, and pyrite, followed by arsenic- copperite, scheelite and a small amount of arsenopyrite. Wait. Huang Jun and other closed-circuit tests using copper-sulfur mixed flotation re-separation and copper-sulfur tailings re-flotation to recover tungsten. The yield was 2.16% from the ore containing 0.74% Cu, 0.078% WO3, copper grade 30.35% Cu, copper. Recovery of 92.94% copper concentrate; yield 0.17%, tungsten grade 33.10% WO3, tungsten recovery rate 73.59% tungsten concentrate.
(3) Comprehensive recovery of tungsten- molybdenum ore
The main useful minerals in a low-grade tungsten-molybdenum ore in Guangxi are molybdenite and scheelite, and a small amount of pyrite and pyrrhotite. The gangue minerals are mainly pyroxene, garnet and quartz. Lu Shiwei and others used molybdenum-sulfur preferential flotation-mixed concentrate re-grinding molybdenum-sulfur separation-mixed floating tailings and re-selected tungsten process. The closed-circuit test obtained molybdenum concentrate with molybdenum grade of 50.39% Mo and recovery rate of 91.17%. A sulfur concentrate with a sulfur grade of 36.78% S and a recovery of 56.43%, a tungsten concentrate with a grade of 60.37% WO3 and a recovery of 68.94%.
The tungsten ore ore mine in a certain area of ​​Hainan contains 0.56% Mo, 0.28% WO3, 2.44% Fe, and belongs to low grade tungsten-molybdenum iron polymetallic ore. Xiao Junhui and other researches have developed a flotation-weak magnetic separation-re-election process suitable for the tungsten-molybdenum polymetallic ore beneficiation. The primary selection of flotation process is used to recover molybdenum by one rough selection, and the flotation tailings adopt weak magnetic field. The magnetite is recovered and the tungsten is selected by two selective re-election processes. The process can obtain a molybdenum concentrate with a grade of 45.86% Mo and a recovery rate of 88.19%, containing 0.07% WO3, 1.12% Fe; tungsten Concentrate grade 72.80% WO3, recovery rate 82.88%, containing 0.07% Fe, containing 0.02% Mo; iron concentrate grade is 56.88% Fe, recovery rate is 50.15%, containing WO3 0.06%, containing Mo 0.03%.
In Yunnan, a fine vein-disseminated complex polymetallic tungsten-molybdenum ore, Liang Yiqiang, etc. first recovered the molybdenum by flotation, removed the sulfide, and then pre-throw the tungsten coarse concentrate with the Fa-lcon centrifugal concentrator, and the coarse concentrate was shaken again. Re-elect to get the final concentrate. For ore containing 0.21% WO3, 0.049% Mo, the yield is 57.41% WO3, the recovery rate is 50.55% tungsten concentrate and 2.51% WO3, the recovery rate is 13.42% tungsten rich ore, and the content is 35.21% Mo, the recovery rate is 69.78% of molybdenum concentrate.
(4) Comprehensive recovery of other polymetallic ores
A large Jiangxi tantalum and niobium, tungsten ore deposit to heavy clay ore beneficiation Ta2O5 content of 0.0144%, Nb2O5 content of 0.010%, containing 0.15% WO3, Ta, Nb, W belonging granite high tantalum ore. The main minerals to be recovered are coltan, fine spar, strontium, stellite and scheelite. About 90% of the base metal in the ore is less than 50 μm; more than 90% of the tungsten metal is less than 30 μm, and about 55% of it is less than 20 μm. And the amount of base metal present in the ore is only 65% ​​of the amount of ore metal, and about 27% of the base metal is dispersed in quartz, feldspar, mica, and the dispersion rate is high. Zou Ni et al. used the flotation-re-election method, the synergistic effect of the mixed selection of flotation, the use of collector NB and the auxiliary collector NF, and the coarse selection of flotation concentrates Ta2O5 and WO3. It is about twice as high as the rough selection re-election, and the recovery rates of Ta2O5 and WO3 are 55 and 45 percentage points respectively. At the same time, the YTF-C micro-shaker was used to treat the flotation concentrate by using the characteristics of re-election and high enrichment ratio, and finally obtained 3.74% Ta2O5, 38.35% WO3, recovery rate Ta2O557.86%, WO361.13% , tungsten mixed concentrate, significantly improved the recovery of fine-grained strontium, tungsten minerals and concentrate grade.
A tungsten and rhenium polymetallic deposit in Hunan belongs to the quartz vein black tungsten deposit. Chen Zhijie et al. developed a beneficiation process for “priority flotation smelting mine-floating tailings floating black tungsten ore-black tungsten coarse concentrate re-electionâ€, and obtained the ore feeding with 0.86% WO3 and 0.51% Sb. The antimony concentrate containing 24.60% Sb has a Sb recovery rate of 92.11% and a black tungsten concentrate containing 55.46% WO3, and the recovery rate of WO3 is 77.41%.
The low-grade tungsten- titanium polymetallic ore in Hubei Shiyan contains Fe25.64%, TiO2 is 6.22%, WO3 is 0.26%, iron is mainly magnetite, titanium is mainly ilmenite, and tungsten is mainly black tungsten. Xiao Junhui and others used weak magnetic separation to recover iron ore concentrate, strong magnetic separation of titanium-tungsten mixed concentrate, and composite shaker to re-separate tungsten-titanium to obtain titanium concentrate and tungsten concentrate. In a section of grinding fineness -0.045mm accounted for 95%, weak magnetic separation magnetic field strength H = 0.10T, two-stage grinding fineness of -0.038mm accounted for 95%, strong magnetic separation magnetic field strength H = 1.0T weak magnetic field Under the comprehensive conditions of selective magnetic separation-re-election process, iron concentrate with Fe grade of 62.76%, containing TiO2 of 0.79%, WO3 of 0.09% and iron recovery of 56.20% was obtained; WO3 grade was 65.01%, including Fe is 10.18%, TiO2 is 2.01%, tungsten recovery is 49.67% tungsten concentrate; TiO2 grade is 48.10%, Fe is 21.06%, WO3 is 0.98%, titanium recovery is 71.01% titanium concentrate, realize Comprehensive recovery of valuable metals such as iron, titanium and tungsten.
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