Dalongshan Concentrator, Pingtang Tungsten Mine, Jiangxi Province

(I) Overview The mine is located in the tunnel of Dayu County, Jiangxi Province.
In 1955 the Longshan mine reverted to the state-run large hole by the people, after the establishment of Dalongshan breakout, was built 50 tons / day ore-dressing plant. It was expanded to 125 tons/day in 1963, and the production capacity of the concentrator has reached 200 tons/day. Mainly recovers tungsten and molybdenum . The tungsten coarse concentrate is sent to the Cangzhou Select Factory.
The mine is developed for the flat, and the mining method is shallow hole mining. The ore body has better burial conditions and the surrounding rock and ore are relatively stable.
Electricity comes from the Weinan Power Network and the mine's own diesel power station. It is sent to the concentrator's substation by the 6 kV line of the drifting total depressurization substation, and each of the 560 and 180 kVA transformers is sent to the various sections of the concentrator after depressurization. The installed capacity of the concentrator is 817.3 watts.
Water is taken from the stream in the stream, and the dry season is supplemented by water in the pit and backwater.
(II) Process 1. Raw ore properties The Dalongshan mining area is a high temperature hydrothermal quartz vein tungsten-molybdenum deposit. Metallic minerals wolframite most, molybdenite, and a small bismuthinite, natural bismuth, pyrite, brass ore, cassiterite, etc., wolframite coarse unevenness disseminated based, plate-shaped Crystallization, sometimes in the form of massive crystals, is mainly produced in quartz veins, and is sometimes produced in the contact surface between the surrounding rock and the vein. The monomer separation is generally about 10 mm, and the basic monomer is separated by 0.1 millimeter. The molybdenum ore system is unevenly embedded in thickness and is scaly, most of which are distributed in sheets, blocks and stars. Calcite is more common in crystal cavities.
The surrounding rock accounts for 75-80% of the ore-bearing ore, most of which are deuterated metamorphic rocks, followed by a small amount of phyllite and slate . The surrounding rock contains 0.005~0.015 tungsten and the ore contains 0.201% tungsten. The original ore has a pseudo specific gravity of 1.6 to 1.8, a water content of 2 to 3%, and a mud content of 3 to 4%.
The plant is re-electing – flotation – re-election of joint processes.
Rough selection section: including hand selection, washing, deliming, hand selection, photoelectric selection, manual re-election, crushing, etc. (see Figure 1 below). In 1972, the rate of waste rock selection was 67.8%, the recovery rate was 95.5%, and the rich ore ratio was 2.96.

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Selection section:
(1) Re-election: use a rod mill, three-stage jigging, four-stage stage washing, and select tungsten coarse concentrate.
(2) Flotation: After re-election of the tailings and re-grinding, the molybdenum concentrate is obtained by a flotation operation of one rough selection, six selections and two sweeps. The flotation tailings are washed and recovered by coarse and sweeping stages to recover fine-grained tungsten.
After the combination of the primary slime and the secondary slime, the molybdenum concentrate is selected by a rough selection, six selections, and a second sweeping flotation operation, and the tailings are washed and selected by the coarse and sweeping table. mine. The process flow is shown in Figure 2 below.

The ore contains higher molybdenum (the average is 0.057% in 1973), and the tungsten is coarsely unevenly embedded. It is more suitable to use the principle of re-election-flotation-re-election, even if molybdenum is better. The index (grade of 46% molybdenum, the recovery rate is 80%), and strengthened the selection of tungsten, the recovery rate of tungsten coarse concentrate reached 90.8%.
The combination of manual hand selection and photoelectric concentrator is used to strengthen the waste rock selection operation, which makes the waste rock selection rate reach 67.8%, and the waste stone grade is also lower (including WO30.02% or less), which greatly improves the tungsten grade. (The rich ore ratio is 3.96), which is conducive to improving the tungsten selection index.
The fine mud sorting of the plant has a recovery rate of only 38.1%, which needs further research and improvement. [next]
(3) Operating conditions of main and other equipment of the concentrator (Table 1~ Table 8)

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Continued on the table

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(4) Innovation results
1. Application of Photoelectric Concentrator 1) Principle After the ore mine is washed and classified, the mechanical queuing transport mechanism of photoelectric beneficiation is carried out, and the ore particles are freely landed one by one, through the illumination of light and the inspection of photosensitive elements, due to The surface of the white ore-bearing gangue and the dark surrounding rock are different in color, and the reflection intensity of the light is also different. The change of the optical signal is converted into the change of the electric signal by the photosensitive element, and then the signal is amplified by the transistor amplifier to attract the relay and push Actuator action, to achieve the separation of gangue and surrounding rock. The ore transportation sorting process is shown in Figure 3 below.

2) Sorting process and effect The sorting size is -38+16 mm, and the gangue products and waste stone products are manually selected for re-selection (the quality of the photosensitive elements is poor, which affects the sorting effect). The photoelectric separation process is shown in Figure 4 below.

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Under the similar conditions of photoelectric beneficiation and artificial hand selection, the selection effect and indicators are basically the same as those of hand selection. Photoelectric beneficiation can save about 40% of the number of hand-selected people. At the same time, it can improve labor productivity and improve working conditions. It has a certain presumption effect on production. The two ore dressing plants in the mine have been promoted. The production practice in recent years has also exposed some shortcomings. For example, several mechanical queuing devices, single-machine processing capability, and light pipe quality are still to be further improved. See Table 9 for the selection criteria for photoelectric beneficiation.

2. Epoxy resin shaker The factory has been using the epoxy resin shaker produced by this mine for more than a year. Its main advantages:
1) The production time is 3/2 shorter than the raw paint, and the cost is lower than the raw paint shaker;
2) The shaker is glued to the joint without the use of nails, which prevents the perishable phenomenon of the shaker surface caused by the water seepage of the nail holes, thereby prolonging the service life of the shaker;
3) Wear-resistance, only a small amount of wear marks were observed after more than one year of use. The plant is currently being further certified to better meet the mineral processing requirements.

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