(I) Overview The Yukeng Tungsten Mine is located in Meixian County, Guangdong Province.
The mine was relegated to the state-owned enterprise in 1954. In 1959, the state invested more than 500,000 yuan to build a 125-ton/day machinery factory. In-depth development of industrial science Daqing campaign, the plant develop self-reliance, hard Fen revolutionary spirit, digging large business potential, the beneficiation plant to expand production capacity to 250 tons / day.
In 1964, the mine designed itself, self-constructed, and invested more than 60,000 yuan in accordance with the teachings on the comprehensive utilization of Mao Zhudu, and built a 760-meter-wide production capacity of 5-6 tons/day. Adopt re-election - flotation - re-election - magnetic separation joint process. Strengthen the comprehensive recovery, we are now able to recycle tungsten, molybdenum, copper, bismuth and tin and other five products. In 1973, the output value of by-products accounted for 21.6% of the total output value.
The concentrating plant uses oxidized paraffin soap to float white tungsten , which improves product quality and reduces operating costs.
The mine uses vertical shaft development and shallow hole mining method for mining. The ore dressing plant is located on a hillside 650 meters from the mine. The original mine is transported to the concentrator by diesel locomotives and slopes. The tailings are pumped to the tailings pond with a section of 4 grit sand, and the overflow water is harmless to the farmland after sedimentation. The hand-selected waste rock is transported to the vicinity of the tailings pond with a diesel locomotive, and the dam can be built.
About 50% of the water used in the ore dressing is taken from the water in the pit, 30% from the surface water, and 20% from the backwater. The mine has its own diesel power station.
(II) Process 1. Raw ore properties The ore processed by the ore processing plant is a quartz vein type wolframite . The main metal minerals wolframite, scheelite, molybdenite, bismuthinite, chalcopyrite, and small amounts of cassiterite sphalerite, pyrite. The main gangue minerals as quartz, in addition to a small amount of calcite, barite, white mica. The surrounding rock is diorite . The ore has a specific gravity of 2.7, and the ore hardness is f=8~12, and the water content is 3%. The separation of mineral monomers is better. There are many monomers in the tungsten above 10 mm, and the basic monomers are separated to about 100 mesh. The sulphide ore milled to -200 mesh accounted for 40 to 50% of the basic monomer separation.
2. Process The current production process, including two-stage hand selection, two-stage closed-circuit crushing rough selection process (see Figure 1); one section of grinding, three-stage jigging, five-stage stage washing, and the separation of the rich The selection process (see Figure 2); and the re-election-flotation-selection process for magnetic separation (see Figure 3).
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The current process of the ore dressing plant is a re-election process for two-stage sorting and fine mud treatment. It is suitable for the ore embedding characteristics and production scale of the mine, and is relatively simple and has few equipments. The original process is to mine the rods and mines. After the jigging, the tailings return to the double-layer vibrating screen, and the mines in the shaker are returned to the rod mill. According to the mineral processing plant, the former not only has a large amount of sand return (about 79% of the ore), but also has a low grade of tungsten (about 0.06~0.08%). It returns to the double-layer vibrating screen, which not only increases the equipment load, but also is poor. The ore grade (from 0.4% to 0.14%) was changed. The current part of the ore was returned to the rod mill through the upper part of the single-layer vibrating screen. The lower part of the sieve was classified and the tailings were discarded by the roughing shaker. On the original basis, the concentrator will only add one rod mill and the capacity of a jig will reach 250 tons/day (the grade of fine-grained tailings is 0.06~0.08%, if the single-layer vibrating screen is sieved The ore is directly sorted by a shaker, and most of the tailings are discarded. The mine is returned to the rod mill, so that the influence on the sorting index is not too great, and the rod mill and the jig are not added on the original basis, only 1 is added. ~2 shakers, the production capacity is likely to reach 200 tons / day).
In the sweeping shaker, the ore containing tungsten is also about 0.08%. The single-layer vibrating screen is turned back to make the continuous medium-grained continuous body re-grind, and it is reasonable to select the fine particles in the monomer to enter the shaker.
From the analysis of the crude selection (hand selection + re-election) recovery rate, the factory jig products accounted for 64% of the crude selection recovery rate, while the shaker products accounted for only 22.6%, and the hand-selected rich ore accounted for 13.4%. It is worth noting that the jigging effect of the beneficiation is the best, and the recovery rate accounts for 41.8% of the crude recovery rate. This is to better suit the properties of coarse-grained ore, and to highlight the jigging operation, so that the particles recovered in the jigging early and recovered in the jigging can be recovered in time.
Because the ore depletion rate is as high as 80%, the concentrator has strengthened the hand-selected waste rock operation, adopted the grading selection, increased the washing water pressure, and adjusted the speed of the hand-selected belt conveyor, so that the hand-selected waste stone rate reached 53%. The quality of waste rock is also low. The concentrator is also preparing to change the -80+30mm level to the backhand selection to further increase the rate of waste rock selection.
(III) Main equipment of the concentrator (Table 1)
Shaker operating conditions production indicators (see Table 2)
Jig operating conditions and production indicators (see Table 3)
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Continued on the table
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eference example: Water-sand blasting process with paint-removal and rust-removal from ships
With the water-sand blasting process, an abrasive agent is added to the high-pressure water, in order to enable efficient paint and rust removal from metallic surfaces. Dust contamination concerns mean that pure sand blasting is prohibited in many countries, or permissible only under strict conditions. Water-sand blasting is an alternative which enables the use of abrasive agents, such as sand, silica sand or ground blast furnace slag, in order to achieve different shot blasting results.
In comparison with purely abrasive agent shot blasting systems, this system has the advantage that no deformation (peening) arises in the shot blasted material. With the water-sand blasting process the heat is removed by the water so no form-changing heat concentration occurs in the shot blasted material. In addition, in case of paint removal with high pressure, the removed material is carried in the water and washed away.
In case of the water-sand blasting process, our AK600 HIGH PRESSURE GUN is provided with an injector, through which the abrasive additive is added to the water. With increasing operating pressure, the required quantity of abrasive agent reduces. Vice versa in comparison with pure water jets, a significantly lower pressure is required for a comparable result.
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