Yongping Copper Mine Concentrator

First, the location: located in Lead Hill County, Jiangxi Province. It is 46km away from Shangrao City and 25km away from Lead Mountain County. Further, to Zhegan mining, construction of railway lines never cross, in line with the Zhegan Hengfeng station, full length 29km.

2. History of the factory: Geological exploration of Yongping mining area was carried out in the early 1950s. In 1958, the Shangrao pyrite mine was built in Shangrao area to mine pyrite ore. In 1968, Jiangxi Province built a 800t/day scale mine in the eastern part of the mining area. With the national economic development, the state decided to develop Yongping copper mine, by the Nanchang Nonferrous Metallurgy Design Institute on the scale of mining beneficiation stone 10000t, open-pit mining service life of 24 years.

3. Ore characteristics: The ore is a skarn-type copper deposit with seven ore belts in the whole area. The surrounding rocks are metamorphic sandstone , skarn and limestone. The II ore belt traverses the whole area and has the largest scale, accounting for 78.2% of the total metal content. Among them, the II-4 ore body accounts for 56.6% of the total copper metal in the whole area. Geological reserves: copper sulphide ore 194.9 million tons, copper grade 0.73%, copper metal 1300,800 tons, industrial reserves: ore 98.735 million tons, copper metal 707,800 tons, prospective reserves, ore 96.564 million tons, copper metal 601,000 tons.

The ore type is dominated by brass-pyrite ore, followed by pyrite ore, copper-bearing black soil and limonite iron cap type ore. There are 79 kinds of minerals in the mining area, mainly pyrite, chalcopyrite, chalcopyrite, malachite, natural copper, goethite, hematite, scheelite , pyrrhotite, galena, flash zinc ore. The main non-metallic minerals are quartz , garnet, diopside , actinolite, chlorite, calcite , mica and so on.

The original copper-sulfur ore structure mainly includes dip-dye, strip-like, block-like, etc. The ore is mainly dyed, and the structure of the oxidized and mixed copper-sulfur ore is basically the same as that of the original ore. The copper-bearing black soil is mainly composed of soil and agglomerate. The iron cap has a porous shape, a block shape, a soil structure, and the like.

The ore is in the form of grains, and is composed of six structures including turbidity, dissolution, residue, granules, and powder.

Pyrite is the main copper mineral in ore. It is widely distributed. It is found in various types of ore. It is mainly granular and has a particle size of 0.09~0.04mm and a maximum of 0.5~1mm.

Most of the copper ore is secondary, a few are native, mainly distributed in the oxidation zone, which is dip-dyed pile, irregular and agglomerate, with a particle size of 0.01-0.02 mm and a maximum of 0.25 mm.

The gold distribution is wide and the content is low, but it is relatively uniform, generally 0.03~0.05k/t, and the highest is 5.16g/t, which is mainly distributed in pyrite and chalcopyrite.

All kinds of ores generally contain silver , with an average content of 10g/t and a high of 117.5～334.13g/t. They are mainly distributed in galena, pyrite and chalcopyrite, and are obviously enriched in galena.

The multi-element analysis and image analysis of ore are shown in Table 1. The ore density is 3.2t/m ³ , the hardness is 8-10, and the looseness coefficient is 1.5.

Table 1 Ore image and chemical analysis

Note: The above table shows the results of the comprehensive sample analysis in October 1985.

4. Production Overview: The ore mined in the open air will be transported by car to the original ore bin of the concentrator, with a transport distance of about 3km.

The crushing system is divided into four workshops: coarse crushing, washing, medium crushing and screening, which are arranged in parallel in two series. The crushing adopts the process of three sections and one closed circuit plus washing, and the final product size of the crushed ore is -15 mm.

The grinding and floating process is a section of grinding, copper-sulfur mixed flotation, mixing and re-grinding of copper and sulfur. The entire grinding float is divided into two separate systems, as well as a separate flotation system for the slime.

The grinding fineness of a section is -200 mesh 68%, and the closed-circuit grinding is formed by a Φ5.03×6.4m overflow ball mill and a 660mm×6 hydrocyclone group. The mixed fines have a regrind fineness of -200 mesh and 99%. The Φ3.2×4.5m overflow ball mill and the Φ350mm×8 hydrocyclone group form a closed-circuit grinding.

The copper-sulfur mixed flotation process is a coarse two-sweep. Each system is equipped with six 14.4m ³ inflatable flotation machines for roughing and sweeping operations. The copper-sulfur sorting process is a coarse and one sweeping two fine, coarse and sweeping selection using 12 sets of the above flotation machine, separated into two systems, selected using 2.8m ³ A type flotation machine, each system 6 slots, one Fine 4 trough two fine 2 troughs.

From the bottom flow of Φ45m washing thick pool, into the slime flotation system, using 2.8m ³ A type flotation machine, 6 rough selection, 4 sweeping, 2 selected, but the water content is too high due to the washing spiral The belt cannot be transported, so the beneficiation system is not in use.

Copper and sulfur concentrates are transported by dehydration. Copper concentrate is supplied to Guixi Smelter. Su sulfur concentrate sales, Zhejiang, Fujian, Gan dozens of chemical, sulfuric acid, phosphoric fertilizer manufacturers.

V. Process flow: The production process of the plant is shown in the figure below.

Figure Yongping Copper Mine Plant Production Process

If the chart is unclear, you can call it for free.

6. Production index: The concentrating plant processed the 5000t trial production of the original ore on October 23, 1984. The trial production shows that the process is basically reasonable and adaptable, and the main equipment capacity can basically reach the design index. Production indicators are shown in Table 2.

Table 2 Indicators of Yongping Copper Mine Concentrator

7. Consumption indicators: See Table 3.

Table 3 Main material consumption of the concentrator

8. Main equipment capabilities: See Table 4.

Table 4 Main equipment capabilities

9. Dressing cost: See Table 5.

Table 5 1985 mineral processing production costs

X. Equipment load rate: See Table 6.

Table 6 Main workshop and equipment load rate and operation rate

XI. Tailings treatment: The tailings trestle and tailings pond covers an area of ​​3905.5 mu, the designed storage capacity is 40 million m ³ , the conveying distance is 3200 m, and the service life is 34 y.

There are five tailings dams in the tailings pond. In the initial stage, only No.1 and No.2 dams were built. The dam crest elevation is 109.6m. Because there are farmland downstream, it is classified as a Class II dam. The No. 1 dam is a rockfill dam. The height is 22.6m. The No. 2 dam is a gravity-type homogeneous earth dam with a dam height of 10.4 m.

The designed tailings discharge is 2.41 million t/y, the tailings concentration is 25%, and the tailings are transported in a two-line type (first-line work, first-line standby). The total tailings discharged from the grinding and floating workshop flows through the No. 1 flow trough to the No. 1 sand pumping station, and is pumped by the Dg500 cast iron pipe to the No. 1 combined well, and the No. 2 flow trough passes through the No. 2 sand pumping station. The slurry distribution tank is sent to the No. 2 combined well through the No. 3 chute, and two cast iron pipes of length 270m and 470m are respectively flowed to the No. 1 dam and No. 2 dam, and discharged into the dams through the slurry dispersion pipe. .

The tailings water is used as the return water in the plant. The return water shaft is Φ2.0m, the bottom height is 130.7m, and the well top elevation is 148m. Before reaching the 135m self-flowing water level, the mobile pumping station is used to transport the tailings backwater pump. The house is located in the warehouse, and the tailings water is pumped into the backwater shaft through the Dg600 cast iron pipe. It passes through the Dg800 self-flow pipe through the return water tunnel and flows to the 5000t return pool of the 120m elevation. The return water in the dry season accounted for 90.4% of the water used in the plant, and the other period accounted for 26.6%.

12. Investment effect: The total investment of the basic construction of Yongping Copper Mine (excluding the railway part) is 325.74 million yuan, the unit investment is 98.71 yuan/t·y, and the mineral processing part (including tailings treatment) has an investment of 86.22 million yuan and the unit investment is 26.13 yuan. /t·y. The mineral processing part has been transferred to the total fixed assets of 68.9 million yuan. In 1985, the depreciation expense was 993,000 yuan. The main benefits of the concentrator are shown in Table 7.

Table 7 Main Benefit Indicators of Concentrators

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