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<\/p>\n1 Analysis of the current situation and problems of the filter press system in coal processing plant<\/p>\n
1.1 The content of fine particle size in coal slurry increases. The coal processing plant of Xiegou Mine adopts the combined process of 150-50mm lump coal heavy-medium shallow chute, 50-1.5mm heavy-medium cyclone main re-election, and 1.5-0.2mm coarse coal slurry TCS sorting, and the remaining fine-grained coal slurry is dewatered and recovered by the sedimentation and filtration centrifuge and the fast-opening diaphragm filter press. Through the continuous exploration and implementation of coal slurry reduction technology in recent years, including measures such as reducing the screen slit of the final raw coal desliming screen, reducing the screen slit of the TCS concentrate dewatering arc screen and coal slurry centrifuge, increasing the inner diameter of the bottom flow opening of the TCS feeding cyclone group, and decreasing the flow rate of water on the top of the TCS separator, etc., the effect of intercepting the coarseness has been obvious. Most of the coal slurry with particle size larger than 0.074mm has been effectively recovered in TCS sorting and sedimentation dewatering, which reduces the load of the high-efficiency thickener. The yield of filter press slurry also decreased from 8.0% to 6.5%\uff5e7.0%, and the proportion of less than 0.074mm particle size class in the filter feed of this plant reached about 80%, with large specific surface area, developed pore structure, strong water absorption, and large viscosity of suspension liquid, which made dewatering quite difficult. The dewatering efficiency of the fast-opening filter press decreases significantly when dealing with ultra-fine-grained coal slurry, the filter press cycle becomes longer, the moisture of the filter cake is as high as 25%\uff5e27%, and it is easy to adhere to the filter plate, and it is easy to cause safety accidents by manually poking down the filter cake.<\/p>\n
1.2 The proportion of coal slurry blended into washed coal is restricted There are 12 sets of quick-opening filter presses in the plant, including 6 sets each in the first-phase and second-phase filter presses, which are arranged in a mirror image, and the connection of the equipment of the first-phase filter press system is shown in Figure 1.<\/p>\n
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In the production process, through the 1502 coal slurry reproduction scraper can be directly mixed into the washed coal, as a power coal sales; also can enter the 1553 coal slurry factory tape machine landing, in situ drying and then by the automobile ground sales. As the contract index of washed coal moisture is less than 10.0%, the moisture level of filtered coal slurry directly affects the proportion of washed coal blended into it. In order to avoid the loading of the car bin and winter freezing accidents, the plant can only strictly control the amount of coal slurry into the mix, especially when the two-phase system at the same time wash fine coal, often half of the mixing half of the landing. The filtered coal slurry after landing can only be disposed of locally according to the tailing coal at a lower price, resulting in a significant reduction in the economic benefits of the enterprise, and environmental pollution caused by a series of links such as coal slurry stockpiling, loading and transporting.<\/p>\n
1.3 Aging of the original filter press The original filter press was put into use in 2010, with different degrees of aging of the electric control and hydraulic systems, deformation of the frame, frequent failures and high maintenance costs. In view of the above problems, the plant urgently needs to find a new type of filter press to replace the original fast-opening filter press to further reduce the moisture of coal slurry, so as to realise that the filtered coal slurry can be fully incorporated into the blended coal, improve the quality of coal slurry, and increase the economic benefits.<\/p>\n
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