摘要
氧化铍具有高熔点、高硬度、低介电常数以及良好的导热性等特点,被广泛用于核技术、真空电子及特种冶金等领域。本文以硫酸法工艺中获得的氢氧化铍为对象,焙烧制备氧化铍,研究氢氧化铍分解规律。研究结果表明:(1)预热环节主要发生吸附水和结晶水的挥发,预热时间越长,温度越高,水分挥发越多,Be(OH)_(2)颗粒表面越光滑,但预热温度过高时,颗粒会发生部分破碎;(2)焙烧环节主要发生Be(OH)_(2)分解生成BeO,焙烧时间越长温度越高分解程度越大,颗粒破碎越严重;(3)在预热温度和时间分别为500℃和3 h、焙烧温度和时间分别为1000℃和3 h的条件下,可以实现最优的Be(OH)_(2)分解结果,焙烧产物失重率达到了60.1%。本文成果可为工业上氢氧化铍焙烧生产氧化铍提供一定的借鉴与参考。
Beryllium oxide has such characteristics as high melting point,high hardness,low dielectric constant and good thermal conductivity,and is widely used in nuclear technology,vacuum electronics and special metallurgy.Beryllium hydroxide obtained by sulfuric acid process is used as the object,beryllium oxide is prepared by roasting,and the decomposition law of beryllium hydroxide is studied.The results show that:(1)the volatilization of adsorption water and crystal water mainly occurs during the preheating process,and the longer the preheating time,the higher the temperature,the more water volatilizes,and the smoother the surface of Be(OH)_(2)particles,but when the preheating temperature is too high,the particles will be partially broken;(2)Be(OH)_(2)decomposition mainly occurs during the roasting process to form BeO,and the longer the roasting time,the higher the temperature,the greater the degree of decomposition,and the more serious the particle breakage;(3)under the conditions of 500℃and 3 h for preheating temperature and time,and 1000℃and 3 h for roasting temperature and time,respectively,the optimal Be(OH)2 decomposition results are achieved,and the weight loss rate of the roasted products reaches 60.1%.The results can provide a certain reference for the industrial production of beryllium oxide by beryllium hydroxide roasting.
作者
赵强
马钟琛
ZHAO Qiang;MA Zhongchen(Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,Hunan,China)
出处
《工程建设》
2024年第1期7-13,共7页
Engineering Construction
基金
国家重点研发计划资助项目(2021YFC2902305)。
关键词
氢氧化铍
分解
焙烧
氧化铍
beryllium hydroxide
decomposition
roasting
beryllium oxide
