This work was conducted to study the operating characteristics of a grinding system designed to obtain fine rice husk ash powder. To find better utilization of the rice husk, a valuable by-product from rice production, once the rice husk was combusted and the thermal energy was recovered from the fu...
This work was conducted to study the operating characteristics of a grinding system designed to obtain fine rice husk ash powder. To find better utilization of the rice husk, a valuable by-product from rice production, once the rice husk was combusted and the thermal energy was recovered from the furnace, the ash was fed and pulverized in the grinding system resulting a fine powder to be used as a supplementary adding material to the portland cement. In order to develop an efficient grinding system to produce the fine powder of rice husk ash for use of a supplementary adding material to the portland cement. We tried to analyze how the operating factors affected the grinding characteristics of a grinding system. Dry grinding time(5, 15, 30, 45 min), impeller speed(250, 500, 750 rpm), and mixed ratio(4.8, 7.9, 14.9) were three operating factors examined for the performance of a dry type stirred ball mill. Wet grinding time(15, 30, 45 min), impeller speed(250, 500, 750 rpm), and mixed. ratio(6.7, 8.4, 11.1, 20.9)were three operating factors examined for the performance of a wet type stirred ball mill. We summarize the results as follows. 1. For the operating condition employed in dry fine grinding, mean diameter of fine ash powder, specific energy input, and grinding energy efficiency were in the range of 1.79~16.04㎛, 0.7~5.23 kWh/kg, and 1.11~12.15 m²/Wh, respectively. 2. For the operating condition employed in wet fine grinding, mean diameter of fine ash powder, specific energy input, and grinding energy efficiency were in the range of 2.831~9.579㎛, 0.5-6.73 kWh/kg, and 0.51-3.27 m²/Wh, respectively. 3. With the stirred ball mill used in this study, the minimum attainable mean diameter of ash powder appear to be 2 pm. Fine grinding of rice husk ash, the difference in specific surface area of powder increased and the grinding energy efficiency decreased with the increase in total grinding time, impeller speed, and mixed ratio. 4. Grinding time of 30 min, impeller speed of 750 rpm, and mixed ratio 4.8 were chosen as the best operating conditions of the dry fine grinding. At these conditions, mean particle diameter of the fine ash, grinding energy efficiency, grinding throughput, and specific energy input were 2.73㎛, 3.95m²/Wh, 0.25kg/h, and 1.22kWh/kg, respectively. 5. Grinding time of 45 min, impeller speed of 500 rpm, and mixed ratio 6.7 were chosen as the best operating conditions of the wet fine grinding. At these conditions, mean particle diameter of the fine ash, grinding energy efficiency, grinding throughput, and specific energy input were 2.837㎛, 2.28 m²/Wh, 0.17kg/h, and 2.03 kWh/kg, respectively. 6. Wet fine grinding which has no fly dust causing pollution and makes continuous operation easy, is appeared to be used for automatization of grinding processing. 7. Under the operating conditions used in this study, dry grinding system showed an inclination to be higher than wet grinding system in difference in specific surface area and grinding energy efficiency.
This work was conducted to study the operating characteristics of a grinding system designed to obtain fine rice husk ash powder. To find better utilization of the rice husk, a valuable by-product from rice production, once the rice husk was combusted and the thermal energy was recovered from the furnace, the ash was fed and pulverized in the grinding system resulting a fine powder to be used as a supplementary adding material to the portland cement. In order to develop an efficient grinding system to produce the fine powder of rice husk ash for use of a supplementary adding material to the portland cement. We tried to analyze how the operating factors affected the grinding characteristics of a grinding system. Dry grinding time(5, 15, 30, 45 min), impeller speed(250, 500, 750 rpm), and mixed ratio(4.8, 7.9, 14.9) were three operating factors examined for the performance of a dry type stirred ball mill. Wet grinding time(15, 30, 45 min), impeller speed(250, 500, 750 rpm), and mixed. ratio(6.7, 8.4, 11.1, 20.9)were three operating factors examined for the performance of a wet type stirred ball mill. We summarize the results as follows. 1. For the operating condition employed in dry fine grinding, mean diameter of fine ash powder, specific energy input, and grinding energy efficiency were in the range of 1.79~16.04㎛, 0.7~5.23 kWh/kg, and 1.11~12.15 m²/Wh, respectively. 2. For the operating condition employed in wet fine grinding, mean diameter of fine ash powder, specific energy input, and grinding energy efficiency were in the range of 2.831~9.579㎛, 0.5-6.73 kWh/kg, and 0.51-3.27 m²/Wh, respectively. 3. With the stirred ball mill used in this study, the minimum attainable mean diameter of ash powder appear to be 2 pm. Fine grinding of rice husk ash, the difference in specific surface area of powder increased and the grinding energy efficiency decreased with the increase in total grinding time, impeller speed, and mixed ratio. 4. Grinding time of 30 min, impeller speed of 750 rpm, and mixed ratio 4.8 were chosen as the best operating conditions of the dry fine grinding. At these conditions, mean particle diameter of the fine ash, grinding energy efficiency, grinding throughput, and specific energy input were 2.73㎛, 3.95m²/Wh, 0.25kg/h, and 1.22kWh/kg, respectively. 5. Grinding time of 45 min, impeller speed of 500 rpm, and mixed ratio 6.7 were chosen as the best operating conditions of the wet fine grinding. At these conditions, mean particle diameter of the fine ash, grinding energy efficiency, grinding throughput, and specific energy input were 2.837㎛, 2.28 m²/Wh, 0.17kg/h, and 2.03 kWh/kg, respectively. 6. Wet fine grinding which has no fly dust causing pollution and makes continuous operation easy, is appeared to be used for automatization of grinding processing. 7. Under the operating conditions used in this study, dry grinding system showed an inclination to be higher than wet grinding system in difference in specific surface area and grinding energy efficiency.
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