Chen Lin Wang Fei Abstract In this paper, the problem of easy blockage of the sieve column of the slime centrifuge is analyzed. The method of solving the problem by using the high-pressure wind straight blown sieve column of mine is proposed, which embodies the characteristics of simple design, installation, commissioning, maintenance and use. Key words mine high pressure wind coal slurry centrifuge screen column cyclone dehydration product moisture 1 Introduction The LLL 2930X470 slime centrifuge produced by the original XX factory has a feed size of -3 mm, a sieve size of 0.35 mm, a production capacity of 15 to 25 t/h, a rotation speed of n=600 rpm, and a product moisture of 12% to 20%. . As an important equipment for processing the bottom of a concentrator in the new system, it was installed in the Xinzhuang Coal Preparation Plant in March 2002. It was found that the dewatering effect was extremely unsatisfactory. The moisture content of the product was good and bad, and sometimes it was unstable. Sometimes it was more than 50%, and it flowed down the slime chute, causing the belt to slip. It can not be used normally for a certain period of time, which seriously restricts the treatment of slime water. 2 Cause analysis (1) Analyze the concentration of the underflow of the concentrator. When the slime centrifuge is installed, the original demolition (treated slime) high-frequency sieve feed pipe and cyclone are used, and the cyclone bottom flow enters the slime centrifuge. The measured feed concentration was around 800 g/L. (2) We screened the feed size, as shown in the table below. From the perspective of the feed size, the content of 0.25-0.50 mm is 16.07%, the content of +0.500mm is 16.52%, and the content of 0.125-0.25 mm is 31.71%. The particle size meets the sieve size requirements of the slime centrifuge. (3) The mechanics and operators believe that the water content of the product is 10 to 20 m after each sifting screen, which is about 19% to 25%, which basically meets the requirements. To this end, the centrifuge guard was dismantled and found that every time the moisture exceeded the standard, the screen sieve was basically blocked by fine coal slurry and could not be dehydrated. After analysis, the slime plugging sieve reduces the effective area of ​​dewatering of the sieve column, which is the main reason for the dehydration of the centrifuge. 3 program design, installation and commissioning (1) Combine the actual material and introduce the high pressure wind into the slime centrifuge. The fine coal slurry is separated from the sieve by blowing the sieve with high pressure air. (2) The introduction of high-pressure wind does not affect the centrifugal detachment of water. Considering the requirements of installation, disassembly and observation, the designed pipeline is shown in Figure 1. a Material is 4 points ordinary steel pipe. b All pipes are connected and welded. c The blower pipe cuts a slit of 2 to 5 mm along the vertical sieve seam inside, so that the narrow slit is perpendicular to the screen joint. d The taper of the pipeline is consistent with the sieve column of the slime centrifuge. The vertical height is slightly smaller than the height of the screen. The upper loop is larger than the upper and lower openings of the screen. e Standard joints and shroud welding for induction pipe welding f Wind direction is shown in Figure 2. g The arrangement of the pipes on the shield is shown in Figure 3. In addition, cut a round hole near the observation window, bury the welded short tube with the joint, and then fix it; the joint between the short tube and the cut hole should not be leaked. 4 Installation requirements (1) Make a note of the position of the shield observation hole. (2) Put the welded blower into the screen bar and stabilize it horizontally. The lower loop tube is located horizontally in the centrifugal liquid collection tank outside the sieve column. (3) Adjust the blowing pipe device so that the air inlet pipe head is near the position of the observation window hole, and after correction, spot welding along the lower ring pipe. (4) Use a high-pressure air blower to observe whether the blowing pipe is firm or not, and whether it has any influence on the screen. After confirming that it is correct, install the shield. (5) Connect the air duct head and the shield duct joint from the observation hole with a high-pressure hose. The high-pressure hose should not be too long. Avoid rubbing the screen when blowing. 5 debugging (1) After checking everything is correct, start the equipment, open the damper, slowly inject the slime water, adjust the damper, and observe the influence of wind pressure on the slime moisture. (2) From May 2002 to the present, the following effects have been achieved. a High pressure air pressure is controlled within the range of 013 to 016 M P, and the product moisture basically meets the requirements. b The feed concentration has little effect on the product moisture. c The screen bar does not need to be washed, and the phenomenon that the slime blocks the screen joint is gone. d After the introduction of high-pressure air, the speed at which the centrate leaves the collection tank is significantly accelerated, and the collection effect is clearly good. 6 Conclusion (1) Combine the conditions of the factory and introduce the high-pressure wind into the slime centrifuge. The effect is more successful. (2) Design, installation and adjustment, simple, easy, economical, and have promotional value. |
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