菱镁矿悬浮态与堆积态煅烧对产物特性的影响

利用实验室自制小型模拟悬浮态煅烧装置和马弗炉,对菱镁矿进行快速煅烧试验制备轻烧氧化镁,分别对悬浮态和堆积态的煅烧产物进行分解率、XRD、SEM、活性等分析,探讨两种煅烧方式对轻烧氧化镁特性的影响.结果表明:相对于堆积态煅烧,菱镁矿经悬浮态煅烧1 min后分解率即可达到98;以上,得到的轻烧氧化镁晶粒尺寸小、结晶度低,比表面积大、表现出很高的活性;悬浮态煅烧显著强化了热传递过程,加快了反应速度,生产效率成倍提高,产品性能好、质量稳定,可应用于大规模生产高活性轻烧氧化镁.

Influence of Calcined Magnesite with Suspension State and Accumulation State on Properties of Product

Miniature analog suspended state calcination device and muffle furnace were utilized to prepare light calcined magnesia through the rapid calcination experiments of magnesite.The decomposition rate, XRD, SEM and activity of the calcined products in the suspended state and the accumulated state were analyzed, respectively, and the effects of two different calcination methods on the characteristics of light calcined magnesia were discussed.The results indicate that the decomposition rate reaches up to 98% after 1 min calcination in suspension state, which is much higher than that in accumulation calcination.In addition, the as produced light calcinedmagnesia shows the characteristics of small grain size, low crystallinity, large specific surface area, and high activity.Suspended calcination significantly enhances the heat transfer process, speeds up the reaction rate, which makes a significant contribution to increase the production efficiency, and improve the performance and stable quality of products.Suspended calcination can be applied to large-scale production of high activity light calcined magnesia.