高温煅烧氢氧化铝生产中α-Al_(2)O_(3)定量转变的影响因素  

Factors Influencing the Quantitative Transformation ofα-Al_(2)O_(3) in the Production of High-temperature Calcined Alumina

作　　者：梁李斯[1] 徐强 高艳丽 马冰 陈长科 赵晨 LIANG Lisi;XU Qiang;GAO Yanli;MA Bing;CHEN Changke;ZHAO Chen(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;Xinjiang Key Laboratory of Aluminum-based Electronic and Electrical Materials,Urumqi 830013,China;Xinjiang Joinworld Company Limited,Urumqi 830013,China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055 [2]新疆铝基电子电工材料重点实验室,乌鲁木齐830013 [3]新疆众和股份有限公司,乌鲁木齐830013

出　　处：《有色金属工程》2023年第7期16-24,共9页Nonferrous Metals Engineering

基　　金：陕西省教育厅重点实验室项目(Z20200151);陕西省自然科学基础研究计划面上项目(2022JM-245)。

摘　　要：为探究煅烧过程中不同因素对α-Al_(2)O_(3)定量转变的影响规律及其机理,并确定制备特定α-Al_(2)O_(3)含量的最佳制备条件,将4N级氢氧化铝在不同温度、升温速率以及保温时间下进行煅烧。对煅烧后的样品进行定性定量分析,采用响应曲面分析法建立优化模型,并通过实验进行验证。结果表明:煅烧温度与保温时间是影响氧化铝相变过程α-Al_(2)O_(3)定量转变的主要因素,随着煅烧温度与保温时间的增长,α-Al_(2)O_(3)的含量也在增加。在煅烧温度为1130~1170℃、升温速率1~5℃/min、保温时间1~3 h的条件下,以α-Al_(2)O_(3)含量值为响应变量建立模型,分别设定α-Al_(2)O_(3)含量取值为0.75、0.85和0.95进行验证,相对应所得最优结果煅烧温度分别为1155.53、1169.14、1169.54℃,升温速率分别为4.97、4.94、4.95℃/min,保温时间分别为2.97、2.41、2.67 h,所建立模型预测结果与实验结果相差小于8%,证明所建模型有效。In order to investigate the influence law of different factors on the quantitative transformation ofα-Al_(2)O_(3) during calcination and its mechanism,and to determine the optimal preparation conditions for the preparation of specificα-Al_(2)O_(3) content,4N grade aluminum hydroxide was calcined under different 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 affecting the quantitative transformation ofα-Al_(2)O_(3) during the phase change of alumina,and the content ofα-Al_(2)O_(3) rises with the increase of calcination temperature and holding time.Under the range of calcination temperature of 1130—1170℃,heating rate of 1—5℃/min,and holding time of 1—3 h,α-Al_(2)O_(3) content value is used as the response variable to establish a model and set it respectivelyα-Al_(2)O_(3) content values were 0.75,0.85,and 0.95 for validation,and the corresponding optimal calcination temperatures were 1155.53,1169.14,and 1169.54℃,respectively.The heating rates were 4.97,4.94,and 4.95℃/min,respectively.The holding time was 2.97,2.41 and 2.67 h,respectively.The difference between the predicted results of the established model and the experimental results was less than 8%,indicating that the established model was effective.

关 键 词：Α-氧化铝 煅烧 定性 定量转变 响应曲面 

分 类 号：TB34[一般工业技术—材料科学与工程]