论文部分内容阅读
采用活性炭辅助微波活化煤矸石,将煤矸石的活化时间由传统高温焙烧方法的2 h缩短到了24 min以内。将70目活性炭与200目煤矸粉以2.0∶1的质量配比充分混合后在800 W微波功率下活化24 min,铝铁浸出率可达750℃焙烧2 h的1.71倍。将微波看做实体物质,将活化过程看做是由活性炭向煤矸粉的单向微波能量传递,引入化学反应工程学方法,“枣糕”模型计算表明,在680 W功率下,活性炭的微波附着速率常数ka=0.334 min-1,微波脱附速率常数k’a=0.050 min-1,煤矸粉的微波附着速率常数kb=0.262 min-1,相关系数R=0.99997。在528、680、800 W 3个功率水平下,“枣糕”模型的计算值均与实验值拟合良好,相关系数均高于0.999,在以上3功率下,发现极限铝铁相对浸出率a与极限温升ΔTmax近似成正比。
Activated carbon is used to activate coal gangue by microwave, and the activation time of coal gangue is reduced from 2 hours of traditional high-temperature roasting method to less than 24 minutes. The 70 mesh activated carbon and 200 mesh coal gangue powder were mixed thoroughly with mass ratio of 2.0:1 and activated at 800 W microwave power for 24 min. The leaching rate of aluminum and iron reached 1.71 times of that of 2 h calcined at 750 ℃. The microwave is regarded as a physical substance, and the activation process is regarded as one-way microwave energy transfer from activated carbon to coal gangue powder. The chemical reaction engineering method is adopted, and the calculation of the “jujube cake” model shows that under the power of 680 W, Microwave attachment rate constant ka = 0.334 min-1, microwave desorption rate constant k’a = 0.050 min-1, microwave attachment rate constant kb = 0.262 min-1, correlation coefficient R = 0.99997. At 528,680,800 W and 3 power levels, the calculated values of “jujube cakes ” all fit well with the experimental data, and the correlation coefficients are all higher than 0.999. Under the above three power levels, Rate a and limit temperature rise ΔTmax approximately proportional to.