高温锻烧氢氧化铝生产中a-Al2O3定量转变的影响因素.

In order to investigate the influence law ol dilierent (actors on the quantitative transformation ol a-Ab 0$ during calcination and its mechanism, and to determine the optimal preparation conditions for the preparation ol specific a-Al2O3 content, 4：N grade aluminum hydroxide was calcined under dilierent temperatures, heating rates, and holding times. The calcined samples were analyzed qualitatively and quantitatively, and the optimization model was established via response surface analysis and verified experimentally. The results show that calcination temperature and holding time are the main factors allecting the quantitative transformation ol crAh 0$ during the phase change ol alumina, and the content ol a-AI2 0$ rises with the increase ol calcination temperature and holding time. Under the range ol calcination temperature ol 1 130 1 170 "C, heating rate ol 1 5 °C/min, and holding time ol 1 3 h, a~ AI2O3 content value is used as the response variable to establish a model and set it respectively Al2 O3 content values were 0. 75, 0. 85, and 0.95 lor validation, and the corresponding optimal calcination temperatures were 1 155.53, 1 169.14, and 1 169.54 °C, respectively. The heating rates were 4.97, 4.94, and 4.95 °C/min, respectively・ The holding time was 2. 97, 2, 41 and 2. 67 h, respectively. The dillerence between the predicted results ol the established model and the experimental results was less than 8 %, indicating that the established model was effective. [ABSTRACT FROM AUTHOR]