超声波强化溶出12CaO·7Al_2O_3的研究

分别用常规溶出和超声波强化溶出对12CaO.7Al2O3的溶出性能进行了研究,结果发现:其他条件相同的情况下,有超声波作用时碳钠质量浓度为80 g.L-1的氧化铝溶出率高于碳钠质量浓度为120 g.L-1的常规溶出的氧化铝溶出率;溶出温度为69℃的氧化铝溶出率高于常规溶出78℃时的氧化铝溶出率;在0~60 min内,超声波作用时间越长强化效果越好;超声波功率在40~140 W之间变化时,氧化铝溶出率呈逐渐增加而后平缓的趋势.此外,还初步探讨了超声波作用机理:超声波的照射提高了离子的运动速度,加速了传质的进行,破坏了颗粒之间的团聚,从而提高了氧化铝溶出率.

Study on enhanced ultrasonic leaching of 12CaO·7Al2O3

The properties of 12CaO·7Al2O3 obtained by ways of conventional leaching and enhanced ultrasonic leaching were studied under otherwise equal conditions. The results showed that the alumina leaching rate of Na2OC 80 g · L^-1 under the action of ultrasonic wave is higher than that of Na2OC 120 g · L^-1 by conventional ways and that the leaching rate at 69°C under the action of ultrasonic wave is higher than that at 78°C, by conventional ways. Better effect is obtained while the ultrasonic wave is acting longer within the range 0-60 min. The leaching rate of alumina increases firstly then comes to easiness while the power of ultrasonic wave changes from 40 to 140 W. Explores preliminarily mechanism of the function of ultrasonic wave, i. e. the ultrasonic radiation can speed up the moving velocity of ions to accelerate the mass transfer and break up the agglomeration of particles and, as a result, the leaching rate of alumina is improved.