为了探究煅烧温度对工业氧化铝相变及活性的影响，将工业氧化铝分别在600、1000、1050、1100、1150、1200和1300℃保温2 h煅烧后，采用XRD和SEM分析物相组成和显微结构，并用激光粒度分析仪测定粒度和比表面积。结果表明：在600℃煅烧时，工业氧化铝中的γ-Al2 O3逐渐转化为η-Al2 O3和θ-Al2 O3；在1000～1150℃煅烧时，η-Al2 O3和θ-Al2 O3逐渐转化为α-Al2 O3，α-Al2 O3衍射峰逐渐增强，晶粒尺寸缓慢增大；1200℃煅烧时，工业氧化铝颗粒表面裂纹最多，细磨后的粒度最小，活性最高。
To investigate the calcining temperature on phase transformation and activity of industrial alumi-na,industrial alumina was calcined at 600,1 000,1 050,1 100,1 150℃,1 200,or 1 300℃for 2 h and then the phase composition and microstructure of calcined samples were analyzed and characterized by XRD and SEM,respectively.Grain size and specific surface area after fine grinding were measured by a laser parti-cle size analyzer.The experimental results show that:after calcining at 600 ℃,γ-Al2 O3 in the industrial alu-mina gradually transforms into η-Al2 O3 and θ-Al2 O3;after calcining at 1 000-1 150 ℃,η-Al2 O3 and θ-Al2 O3 gradually transform into α-Al2 O3;the diffraction peak intensity ofα-Al2 O3 and grain size ofα-Al2 O3 increase gradually with calcining temperature rising;when calcined at 1 200 ℃,the industrial alumina has the most cracks on the particle surface,and is the finest and the most active particle after fine grinding.
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