摘要：为探索煤矸石的高附加值和清洁利用,以内蒙古某地的煤矸石为原料,采用改良的碱石灰烧结法处理煤矸石,使煤矸石中的SiO₂组分转化为CaSiO₃,然后将烧结熟料水溶后所得到的NaAlO₂溶液,经脱硅除杂及降低苛性比处理,利用碳酸化分解法制备超细氢氧化铝粉体。结果表明:煤矸石经加碱烧结后,熟料的Al₂O₃溶出率为81%;碳酸化分解法制备超细氢氧化铝粉体为结晶度和分散性较好的拜耳石,颗粒尺寸大多在300~500 nm之间。

关键词： 煤矸石;烧结;碳酸化分解;超细氢氧化铝

Abstract： In order to research the new technique of high added value and clean use of coal gangue， the coal gangue from Inner Mongolia was used as raw materials， the improved soda lime sintering process was employed to deal with coal gangue by turning SiO₂ into CaSiO₃. The purified NaAlO₂solution was obtained by desilication of the initial NaAlO₂ solution from the dissolution of calcined clinkers. Then the ultrafine aluminum hydroxide powders were prepared by carbonization method. The results showed that the dissolution rate of Al₂O₃ of calcinated coal gangue was 81% . The prepared ultrafine aluminum hydroxide powders were bayerite with good crystallinity and dispersivity， and their particle size was mostly between 300~500 nm. 

Keywords： coal gangue； calcination； carbonization； ultrafine aluminum hydroxide powders