用高效分散剂碳化法从煤矸石中制备超细氢氧化铝粉体

利用煤矸石为原料制备超细氢氧化铝粉体。采用高温煅烧活化煤矸石，利用C2S晶相转变制备煤矸石自粉化料，用8％Na2CO3溶液从煤矸石自粉化料中以NaAlO2形式提取铝组分，用高效分散剂碳化法制备超细氢氧化铝粉体。研究了高效分散剂碳化法制备高纯超细氢氧化铝粉体的影响因素，找出了高效分散剂碳化法制备超细氢氧化铝粉体的最佳条件，制备出了平均粒度〈100nm、纯度〉99．9％的氢氧化铝，为煤矸石的高价值利用开辟了一条新的途径。

The preparation of ultrafine aluminum hydroxide from coal gangue by using powerful dispersant-carbonization

Ultrafine aluminium hydroxide powders are prepared from coal gangue. Calcining at high temperatures to activate coal gangue and controlling the crystal change of C2S were adopted to prepare self-pulverized feed of coal gangue. When extracting aluminum in the form of NaAlO2 from the activated coal gangue by using 8% sodium carbonate solution,uhrafine aluminum hydroxide powders are prepared by using powerful dispersantcarbonization. The factors influencing the preparation of uhrafine aluminum hydroxide powders by powerful dispersant-carbonization have been studied, and the optimum process parameters have been found to prepare the ultrafine powders of aluminum hydroxide. The average diameter of powders is less than 100 nm and the purity is up to 99.9% ,which has opened up a new approach for the high value utilization of coal gangue.