摘要
以轻烧镁为原料,经消化、碳化、除杂、热解及煅烧制备出高纯氧化镁,并确定了适宜的工艺条件:活性炭用量为20 g/L,时间60 m in;活性炭吸附除杂温度20℃,时间80 m in;热解温度100℃,时间20 m in,升温速率均匀缓慢;煅烧温度950℃。氧化镁产品中氧化镁质量分数可达99.5%,氧化钙质量分数小于0.09%,铁的质量分数小于0.05%,产品中粒度小于5μm的粒子质量分数达到72.3%。SEM分析表明,低温热解氧化镁为针状,高温热解氧化镁为球状。
The high purity magnesium oxide was prepared from light -burnt magnesia through hydration, carbonation, impurity - removing, pyrolysis, and calcination. Based on experiments, the suitable preparation parameters were obtained, e. i. the amount of activated carbon,20 g/L;carbonation time,60 min;temperature and time for the removal of impurity with activated carbon,20℃ and 80 min;temperature and time of pyrolysis, 100℃ and 20 min with slow rate;calcination temperature,950℃. The content of magnesium oxide in the product has reached up to 99.5%, and contents of impurity CaO and Fe in the product are less than 0.09% and 0.05% respectively,the grains less than 5μm in the product have reached to 72.3%. The SEM analysis of magnesium oxide indicates that needle crystals of magnesium oxide are obtained at low pyrolysis temperature and spheric crystals are obtained at high pyrolysis temperature.
出处
《无机盐工业》
CAS
北大核心
2006年第5期30-33,共4页
Inorganic Chemicals Industry
关键词
轻烧镁
高纯氧化镁
除铁
活性炭
light - burnt magnesia
high - purity magnesium oxide
iron - removing
activated carbon
