摘要
轻烧MgO的制备工艺决定其作为混凝土膨胀剂的性能。该文研究了菱镁石的矿物组成和热分解特性,并研究了煅烧温度、保温时间、升温速率以及冷却方式等煅烧工艺参数对轻烧MgO的反应活性以及水化热的影响规律。结果表明:选用适宜粒度的菱镁石可以制备高活性MgO粉体,煅烧温度超过700℃后,随着煅烧温度的升高,MgO化学活性显著降低,当煅烧温度高于700℃时,随着煅烧时间的延长,虽然烧失量逐渐增大,菱镁石分解更加完全,但MgO化学活性随之降低,在相同煅烧温度和保温时间下,升温速率越快MgO活性越高,快速冷却方式制得MgO反应活性较高。
Light - burned magnesia （MgO） is generally used as concrete expansion agent, and the properties of MgO expansion a- gent are depended on the preparation processes of MgO. In this paper, the mineral composition and thermal decomposition charac- teristics of magnesite are characterized, and the effects of calcination temperature, holding time, heating rate and cooling calcining process parameters on the reactivity of light - burned MgO are studied. The results indicate that the reactivity of MgO decreased sig- nificantly with the increase of calcinations temperature when the calcinations temperature is higher than 700℃. Although the ignition loss increases gradually as the extension of holding time, the reactivity of MgO decreased. Rapid heating and cooling are conducive to improving the reactivity of MgO.
出处
《广东水利水电》
2016年第3期41-45,共5页
Guangdong Water Resources and Hydropower
关键词
轻烧Mg
O
煅烧温度
保温时间
升温速率
冷却方式
反应活性
light - burned MgO
calcinations temperature
holding time
heating rate
cooling rate
reactivity
