STUDY ON ABSORPTION OF LOW-CONCENTRATION SO2 WITH BASIC SLAG INTENSIFIED BY ULTRASONIC WAVE

摘要

Both the low-concentration SO_2 and Bayer red mud do harm to the environment seriously. In this paper, it focuses on the absorption of low-concentration SO_2 with red mud. It studies on the absorption by roasted red mud and non-roasted red mud, and the experiments are intensified by ultrasonic wave of 20 kHz at different ultrasonic power. Through the single factor experiment and orthogonal test, the results were analyzed by the chemical and XRD analysis technology. The conclusion shows that the desulfurization and dealkalization processes can be intensified by ultrasonic wave. The amount of desulfurization reaches 36.7 ml/g. The optimal conditions are: liquid-solid ratio is 9:1; stirring speed of impeller is 250 rpm; gas flow is 0.1 m3/h; the ultrasonic power is 550 W. But the alkali amount of red mud dealkalizated still can not meet the national standard of cement production, and it needs the further processing to subsequent use.