Hunan somewhere tungsten, molybdenum, bismuth, iron, fluorite complex multi-metal mine is mine Shizhuyuan after another of the same type of large skarn polymetallic ore body, ore and more valuable mineral content, disseminated complex relationships, ore type at home and abroad rare, valuable mineral beneficiation comprehensive recycling technology at home and abroad beneficiation industry also belong to the problem. The Shizhuyuan tungsten, molybdenum, niobium and fluorite polymetallic ore mines have been listed as the national “Eighth Five-Year Planâ€, “Ninth Five-Year Plan†and “Eleventh Five-Year Plan†scientific and technological projects, and many scientific research units carry out scientific and technological research and mines of the same type. Compared with strontium (0.16%), WO 3 (0.6%) and CaF 2 (>17.0%), the valuable minerals of tungsten, molybdenum, niobium and fluorite in the ore body of this study are much lower, and the average grade is: small Process test ore sample WO 3 0.35%, Mo 0.14%, Bi 0.06%, Sn 0.035%, TFe 8.20%, CaF 2 12.11%, industrial test ore sample WO 3 0.25%, Mo 0.09%, Bi 0.04%, Fe 16.0% There are also mineral varieties such as garnet; while the ore contains sulfur (1.1%) and arsenic (0.44%). The inlays are closely related to each other. Sulfide ore and oxidized ore and sulphide ore are symbiotic with each other. The ore is highly oxidized. The valuable minerals are unevenly embedded in thickness. The ore contains many varieties of calcium minerals and contains calcium minerals. The separation between the flotation is difficult, so the ore dressing is very difficult.
The mine has two types of ore bodies, one is a tungsten-molybdenum-niobium-fluorite polymetallic ore with low iron content, and the other is an iron-tungsten-molybdenum-niobite polymetallic ore with high iron content, in which the content of tungsten-molybdenum and rhenium is more Low; this paper discusses the study of the former ore body, but its beneficiation process can also meet the mineral ore dressing requirements of the latter. For the polymetallic ore body, the beneficiation process scheme compares the two processes of flotation-magnetic separation-flotation-magnetic separation-flotation, flotation-magnetic separation-flotation-re-selection, and determines the selected particle size as - 74μm accounted for 83.24%. The whole process was mainly flotation, supplemented by magnetic separation, and obtained six kinds of concentrate products of tungsten, molybdenum, niobium, iron, fluorite and garnet. The total yield of several concentrate products was over 59.7%. The tailings discard rate is 40.3%, which makes the most effective comprehensive recovery of mineral resources.
I. Process mineralogy research
(1) Chemical analysis of samples
Table 1 Sample multi-element analysis results
element | WO 3 | MO | Bi | S | CaF 2 | Cu | Pb | Zn | Sn | TFe | As | C |
Quality score | 0.35 | 0.14 | 0.06 | 1.1 | 12.11 | 0.028 | 0.024 | 0.11 | 0.041 | 8.20 | 0.44 | 0.47 |
element | P | Ag | Au | SO 2 | MgO | CaO | Al 2 O 3 | K 2 O | Na 2 O | Mn | Sb | |
Quality score | 0.071 | 5.0 | 0.20 | 34.1 | 0.71 | 24.7 | 5.86 | 0.3 | 0.054 | 0.45 | 0.002 |
The Au and Ag grade units are g∕t.
(2) Analysis of sample phase
The results of tungsten and molybdenum phase analysis are shown in Table 2. The sample phase analysis results are shown in Table 3.
Table 2 Analysis results of tungsten and molybdenum phases
Table 3 Results of the phase analysis
(3) Main mineral composition
Mineral composition of the ore complexity and diversity, main mineral pyrite, gum pyrite, arsenopyrite, pyrrhotite, marcasite, molybdenite, bismuthinite, galena, sphalerite, yellow copper ore, chalcocite, tetrahedrite, magnetite, hematite, limonite, siderite, cassiterite, silica, rutile, garnet, (Ci) diopside, diopside, actinolite, tremolite, idocrase, chlorite, hornblende, talc, white mica, black mica, kaolinite, sericite, epidote, zoisite I, tourmaline, calcite, (Fe ) dolomite, scheelite, wolframite, apatite, gypsum, molybdenum Chinese, Chinese tungsten, bismuth bubble, azurite, fluorite, carbonaceous material. There are more than 70 kinds of metal and non-metal minerals. The minerals available in the ore are mainly molybdenite and scheelite. The fluorite, wolframite, stibnite, cassiterite and magnet can be considered for comprehensive recycling. Mine, garnet and so on.
(4) Main mineral characteristics
The molybdenum ore is mainly in the form of leaves and strips, and occasionally it is granular. The molybdenum ore is not uniform in particle size, mainly in the range of 0.02 to 0.2 mm, and the thickness is up to several millimeters, and the fineness is less than 0.02 mm.
The stibnite is mainly columnar and fine-grained. It is often distributed at the edge of the molybdenite or is surrounded by molybdenum ore. It is also distributed in small particles in the form of gangue, diopside, tremolite, fluorite and other gangue. In the substrate. The inlaid grain size is much finer than that of molybdenite, mainly below 0.07 mm.
The scheelite is mainly distributed in the skarn minerals of skarn. The grain size of the inlay is uneven, and it seems to have a tendency of polarization. The coarse one is 0.04mm or more, the individual can reach Imm or more, and the fine grain is 0.02mm or less. Below 0.005mm, it is closely related to fluorite, garnet, diopside, calcite, mica and arsenopyrite.
The cassiterite is mainly distributed in a fine particle size. It is closely related to minerals such as tremolite, diopside, mica, chlorite, magnetite, galena, pyrite, and arsenopyrite. The size of the inlay is fine, mostly below 0.02mm.
Fluorite is widely distributed in ore, often in the form of granular aggregates, occasionally in the form of fine veins. The size of the inlaid cloth is not uniform, the thicker is more than 0.07mm, the agglomeration can reach several centimeters, and the small particle size is finer than 0.04mm and is associated with scheelite and diopside.
The magnetite is mainly distributed in a fine granular form and partially oxidized into a magnetite and hematite. Hematite and limonite are mainly granular and fine-grained, and are closely related to minerals such as pyrite, pyrite, calcite and chlorite.
The dissociation degree of the main mineral monomers selected for the ore is shown in Table 4.
Table 4 The primary mineral monomer dissociation degree of the selected ore
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