【摘要】 本实验以高铝粉煤灰为原料、Na2CO3为助剂,经中温烧结,酸溶除硅,碱溶除铁,加入铝酸钡除微量硅后,制得较纯净的铝酸钠溶液;向该溶液中加入Al(OH)3晶种,采用种分分解法制备得到Al(OH)3沉淀,于1200℃下煅烧2 h后,制得α-Al2O3。分析结果表明,制备的-αAl2O3粉体形态不规则,粒径在10μm以下,性能达到国标GB8178-87三级标准。本项技术符合国家发展循环经济的要求,是高铝粉煤灰资源化高效利用的有效途径之一。更多还原

【Abstract】 High-aluminum fly ash is an industrial waste.In order to reduce its pollution to environment,high-aluminum fly ash was used as raw material and Na₂CO₃ used as an auxiliary agent to make the best of Al₂O₃ component in this experiment.First,sodium aluminate liquor was prepared by sintering the mixture at intermediate temperature,acid-leaching for desilication,alkali-leaching for removing iron,and barium aluminate for further desilication.Then,Al（OH）₃ seed was introduced into the purified solution to agglomerate Al（OH）₃ particles by seed precipitation.Finally,α-Al₂O₃ product was prepared by calcining of the Al（OH）₃ precipitate at 1200℃ for 2 hours.The analytical results indicate that the prepared α-Al₂O₃ powder is irregular in shape with granular size of less than 10μm in diameter.Its function meets that of the China National Chemical Standard GB8178-87.This technique is in accordance with the requirements of development of the circulation economy in China.This sort of high-aluminum fly ash is a potential alumina resource in the future.更多还原