几种天然矿物脱除高温气体中碱蒸气研究

Six nature minerals (Acidic argil, Alumina, Kaolinite, Extra grade kaolinite, Meerschaum and Diatomaceous earth) were selected to remove NaCl vapor at high temperature. Main elements of these natural minerals are Si and Al. Experiments were carried out in a self-made equipment which mainly consists of NaCl vapor generating section, fixed-bed reactor and gas absorption section. Results showed that sodium content is dependent on chemical constituent and microporous structure of sorbent and sodium content (4.65%) of kaolinite is the highest in the condition of 850 ℃, 11.0 m/h gas velocity and 5 h operating time. Effects of temperature and gas velocity on sodium content of kaolinite were discussed. Results showed that there is an optimal temperature around 875 ℃ for kaolinite to remove NaCl vapor and sodium content increases when space velocity decreases. In addition, adsorption process of NaCl vapor on kaolinite at 850 ℃ and 11.0 m/h gas velocity was found to be influenced by both chemical reaction and diffusion of a sodium resultant layer from the kinetics.