1 Introduction
Located in the northeastern part of Jiangxi Province, Dexing is the largest copper base in China with the largest reserves ever produced, and is also a world-class large copper selection plant. Under the China Nonferrous Metal Industry Corporation.
It was built in the mid-1960s and is still undergoing expansion. According to the basic design of the US Fulu Company, the processing capacity of the new plant will reach 120kt/d, and the daily production of copper concentrate containing 26.4% copper will be 1982 tons. molybdenum concentrate containing 51% Mo 28.88 t.
2. Deposits, ores and mining
The Dexing copper ore field includes several large copper-molybdenum deposits such as copper plant, Fujiawu and Zhushahong. It is in the border of Jiangnan uplift and Shangrao depression. The mineral composition of the ore produced by the three deposits is shown in Table 1.
Table 1 Analysis of mineral composition in several ore bodies of De powder
Mining area content(%) mineral | Copper factory | Fujiawu | Cinnabar red 1 |
Pyrite | 3.00 | 3.30 | 3.69 |
Chalcopyrite | 1.29 | 1.43 | 1.19 |
Copper ore | 0.0188 | 0.055 | 0.021 |
Arsenic bismuth copper ore | 0.03 | micro- | |
Copper ore | 0.0085 | 0.01 | |
Pyrite: chalcopyrite: molybdenite | 160:69:1 | 60:26:1 | 176:57:1 |
1 cinnabar red is still in the detailed survey.
Obviously, the molybdenum content is the highest in Fujiawu, and the lower part is a brief introduction to the Fujiawu deposit and ore.
Fujiawu Cu - Mo deposit mainly in the contact zone, the strong area alteration to weakly altered to sericite quartz rock angle with the richest. The ore body is spatially surrounded by a porphyry body with a large flat barrel, and the center is an unaltered or slightly altered granodiorite porphyry that is almost completely free of ore. The main mine is in the upper part of the cylindrical body and the top of the rock mass, down, and the ore body becomes smaller due to the shrinkage of the rock mass. At 140m above sea level, the rock mass expands and the ore body expands. In this section, the ore body is in the shape of a ring, the outer diameter of the ring is 900~1070m, the ring width is 200~300m, and the maximum vertical thickness is 336m. Most of the copper and molybdenum in the whole Dexing copper-(molybdenum) ore field are formed in the mid-temperature hydrothermal stage. The molybdenite and pyrite mineralization is slightly earlier than the chalcopyrite. Dexing is a very large porphyry copper-molybdenum ore. field.
Only Fujiawu copper-molybdenum deposits have hundreds of thousands of tons of molybdenum metal reserves, with an average of 0.033% molybdenum, with a large scale of molybdenum ore; with a copper metal volume of several million tons, with an average copper content of 0.501%, with an extra large copper mine scale The associated sulfur reserves are also several million tons, with an average sulfur content of 1.76%. Together with the other two deposits, the total reserves are quite large.
79% of the ore is altered phyllite, 21% altered granodiorite. The ore can also be divided into three types: copper-molybdenum composite ore, copper ore and molybdenum ore. The ore can be divided into minerals according to the combination: quartz-metal mineral type, single-metal mineral type, carbonate-metal mineral type, azurite-gold mineral type, fluorite type.
Metal ore minerals are mainly pyrite, chalcopyrite, molybdenite; gangue minerals are quartz, sericite, chlorite, calcite, epidote, hard azurite, azurite, albite, firefly Stone and so on. Molybdenum ore is closely associated with chalcopyrite, and the particle size is generally between 0.025 and 0.2 mm.
3. Mineral processing technology
In the 1960s, a small selection plant was built, and the scale of new construction plants is rare in China. The new plant uses a copper-molybdenum-sulfur mixed flotation and separation process. Rough grinding and coarse selection, Cu-Ma-FeS 2 mixed coarse concentrate. The coarse concentrate is re-ground, and the sulfur-reducing copper-molybdenum is obtained, and the copper-molybdenum mixed concentrate is obtained. The copper-molybdenum mixed concentrate sorting process is shown in Figure 1.
The selected ore contains low molybdenum grade and contains easy-floating gangue: chlorite, talc , sericite, etc., and recently found a small amount of organic carbon-low metamorphic coal . It is difficult to improve the quality of molybdenum concentrate. The multi-element analysis of the copper-molybdenum-sulfur mixed concentrate is shown in Table 2.
The analysis results of the molybdenum concentrate containing 43% of molybdenum obtained from the FLUOfZ test in the United States are shown in Table 3. [next]
Due to the existence of easy-floating gangue and carbon compounds, especially organic carbon, the production of comprehensive recovery of molybdenum from Dexing Copper is hindered. The design indicators for the new plant are shown in Table 4.
Copper - molybdenum sorting When mixed with sodium hydrogen sulfide, sodium sulfide copper minerals inhibition, sodium silicate, sodium hexametaphosphate phosphate inhibition gangue minerals, kerosene catch molybdenite. The design of the pharmaceutical system is shown in Table 5.
Figure 1 Dexing copper-molybdenum sorting process
Table 2 Multi-element analysis of Cu-Mo-S hybrid
element | Cu | Pb | Zn | Mo | Fe | S | SiO 2 | Al 2 O 3 | CaO | C |
content(%) | 11.05 | 0.013 | 0.014 | 0.16 | 30.86 | 31.73 | 12.86 | 3.60 | 0.14 | 0.27 |
element | MgO | TiO2 | F | As | Bi | Co | Ni | Au(g/t) | Ag(g/t) | |
content(%) | 0.45 | 0.28 | 0.01 | 0.014 | 0.004 | 0.12 | 0.019 | 3.73 | 14.58 |
Table 3 Analysis of molybdenum concentrate composition
element | Mo | Cu | S | Fe | Organic charcoal | Insolubles | Zn |
content(%) | 43.62 | 0.66 | 31.15 | 1.72 | 11.88 | 6.20 | 0.016 |
Table 4 Dexing plant design indicators (%)
content project | Raw ore grade | Grade in the same name concentrate | Recovery rate in the same name concentrate | ||||||
Cu | Mo | S | Cu | Mo | S | Cu | Mo | S | |
Content | ~0.5 | ~0.01 | ~2.0 | twenty four | 45 | 40 | 86 | 50 | 50 |
Table 5 Copper-molybdenum sorting agent system
Drug | Usage (g/t) | Dosing point |
Sodium sulfide | 400 | Molybdenum coarse selection agitation tank |
Sodium hydrosulfide | 170 | Molybdenum fine 1, fine 2, fine 3, fine 4, fine 5 |
Water glass | 156 | Molybdenum fine 1, fine 2, fine 3, fine 4, fine 5, fine 6 |
Hexametaphosphate | 30 | Molybdenum fine 4, fine 5, fine 6 |
Kerosene | 2 | Molybdenum coarse selection agitation tank |
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Designed by U.S. Fluor, the daily processing ore volume of 120kt/d is selected as shown in Figure 2. [next]
Figure 3-21 Design process of Dexing Grand Factory
Rough grinding-roughing adopts 8 parallel systems. Each system consists of one ¢9742×4572mm semi- auto-grinding machine , two ¢5029×8839mm ball mill vibrating screens and two-stage grinding consisting of cyclone. Degree 65% - 200 mesh.
The grinding products are firstly mixed by flotation and flotation, the tailings are re-elected, and the coarse concentrate is re-milled by a ¢3353×6707mm ball mill to float copper-molybdenum to suppress sulfur, and copper-molybdenum mixed concentrate and sulfur concentrate are obtained.
The copper-molybdenum mixed concentrate is combined into concentrated dewatering, and after scrubbing, it is subjected to one rough selection, one fine sweeping selection, one section of re-grinding, and nine times of selection, and is qualified as molybdenum concentrate and copper concentrate (in-tank product). The specification of molybdenum selection using regrinder is ¢1829×3658mm.
In the process, all grading operations use a tourist device.
Mineral processing index (design):
The ore grade is 0.49% Cu, 0.018% Mo, 2.0% S, 0.15 g/t Au, 1.74 g/t Ag. The coarse grinding fineness is 65%-200 mesh, the coarse concentrate has a fine grinding degree of 90%-325 mesh, and the molybdenum concentrate has a fine grinding degree of 98%-325 mesh. Processing capacity is 120kt/d.
The copper concentrate grade is 26.4% Cu, the copper recovery rate is 89%, and the copper concentrate production is 1982t/d.
The molybdenum concentrate grade is 51% Mo, the molybdenum recovery rate is 66.3%, and the molybdenum concentrate production is 28.88 t/d.
The sulfur concentrate grade is 40% S, the sulfur recovery rate is 63.2%, and the sulfur concentrate production is 3792 t/d.
Gold and silver have a grade of 3.15g/tAu and 70.71g/tAg in copper concentrate, and the recovery rate is 60%.
Pharmacy system (design) (g/t):
Lime (CaO content 80%) consumption | 1100 | MIBC | 49.5 |
Diamine dibutyl thiophosphate | 7 | Flocculant | 1.3 (concentrator) according to the amount of copper-molybdenum mixed concentrate |
Zheng Ding Huang Yao | twenty three | Ammonium sulfide | (100%) 4000 (copper-molybdenum separation) calculated by copper-molybdenum mixed concentrate |
Sulfuric acid (93%) | 1100 | Sodium hydrosulfide | 7500 (copper-molybdenum separation) is measured by copper-molybdenum mixed concentrate |
25 #é»‘è¯ | 1 | kerosene | 125 (copper-molybdenum separation) is measured by copper-molybdenum mixed concentrate |
65 #泡泡剂 | 18.4 | Sodium hydroxide | 20 (copper-molybdenum separation) measured by copper-molybdenum mixed ore |
Inhibitor | 1000 |
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