The Experimental Research And Parameter Optimize Of Fluidized Flotation Column For Coal Fine

With the constant improvement of the coal mining mechanization level, the content of coarse coal in the raw coal increased higher and the coarse coal slime separation become a important link of coal preparation process. Traditional coarse coal slime processing relies mainly on the separation equipment such as interference bed, spiral separator and dense-medium. These equipment have solved the problem that the coarse coal is difficult to separate to a certain extent. However, these equipment make the process complex, and it is difficult to deal with the low density coal slime. So we design a new kind coarse coal separationequipment to separate the coarse coal directly. A mass of research was proceed relate to the separation of coarse coal directly. The fluidized flotation column for coal fine based on the interference bed designed by our students can make the coarse separate directly.The grating plate was set on the gas-water mixing spread of nozzle and the velocity and force upward would increase after passing the grating plate. The coarse coal was blocked and sink slower when passed through the grating plate. The coarse coal crashed strongly and the high concentration of coarse coal was formed. The rule of coarse coal of Tunlan coal preparation plant was searched with the different parameters such as aeration quantity, rising-water, coal concentration and feeding-outlet-height by setting a round hole grating plate, a same opening rate square hole grating plate and without grating plate. Conclusion from the analysis: when the aeration quantity was 236L/(m~2×min), the rising-water was 1364L/(m~2×min), the coal concentration was 250g/L, the feeding-outlet-height was 977 mm and without a grating plate on the gas-water mixing spread of nozzle, the yield and the ash of the concentrate was 62.24% and 12.81% and the ash of tailing was 50.87%; when the aeration quantity was 236L/(m~2×min), the rising-water was 1364L/(m~2×min), the coal concentration was 250g/L, the feeding-outlet-height was 977 mm and with a square hole grating plate on the gas-water mixing spread of nozzle, the yield and the ash of the concentrate was 75.28% and 13.19% and the ash of tailing was 67.63%; when the aeration quantity was 236L/(m~2×min), the rising-water was 1364L/(m~2×min), the coal concentration was 250g/L, the feeding-outlet-height was 977 mm and with a round hole grating plate on the gas-water mixing spread of nozzle, the yield and the ash of the concentrate was 77.14% and 14.02% and the ash of tailing was 68.93%. Contrast found that the yield of concentration increase 24.41%and 27.27% by setting a square hole grating plate and a round hole on the gas-water mixing spread of nozzle. Set a round hole grating plate on the gas-water mixing spread of nozzle is more beneficial to the coarse coal sepatation.The four factors three levels orthogonal test was designed by the Design-Expert 8.0 software to optimize the rising-water, the aeration quantity, the coal concentration and the feeding-outlet-height. Conclusion from the analysis: when the aeration quantity was 256.08 L/(m~2×min), the rising-water was 1364 L/(m~2×min),the coal concentration was 247.38 g/L, and the feeding-outlet-height was 967.38 mm, the optimal value of the yield of concentrate was 77.81%; when the aeration quantity was 256.14 L/(m~2×min), the rising-water was 1364 L/(m~2×min),the coal concentration was 247.89g/L, and the feeding-outlet-height was 967.38 mm, the optimal value of the ash of concentrate was13.54%; when the aeration quantity was 255.76 L/(m~2×min), the rising-water was 1363.99 L/(m~2×min), the coal concentration was 247.72g/L, and the feeding-outlet-height was 967.56 mm, the optimal value of the ash of tailing was 73.23%. The yield and ash of the concentration and the ash of tailing was analyses by the aeration quantity, the rising-water, the coal concentration and the feeding-outlet-height through the influence surface, the influence of the parameters on the effect of coarse coal slime separation size was in turn: B rising-water>A aeration quantity>C coal concentration>D feeding-outlet-height.