Calcined magnesite is a binding additive and an MgO-bearing flux for pellets production. The effects of cal- cination temperature and time on the characteristics of calcined magnesite were investigated. Experimental r...Calcined magnesite is a binding additive and an MgO-bearing flux for pellets production. The effects of cal- cination temperature and time on the characteristics of calcined magnesite were investigated. Experimental results in dicated that the best calcination condition was 850℃ and 1h. Under this condition, the hydration activity of the eal cined magnesite was 80.56%, and the average diameter of crystal grain D, specific surface area S and the medium particle size D50 were 25.4 nm, 45.40 m2/g and 3.41μm, respectively. This kind of calcined magnesite was a good binding additive for pellets production. At the same proportion of calcined magnesite, the effects of activities of cal cined magnesite on metallurgical properties of green pellet and indurated pellet showed that calcined magnesite with high activity could improve the dropping strength and compressive strength of green pellet and enhance the burst temperature of green pellet; however, the effects of activity on compressive strength, low-temperature reduction degradation index, reduction swelling index and reduction index of indurated pellet were not obvious.展开更多
采用石墨炉原子吸收法测定轻烧镁中的微量铅,用国际通用的《测量不确定度表达指南》(Guide to the Ex pression of Uncertainty in Measurement, GUM)及现代数理统计学理论对分析结果进行了不确定度评定,根据测定方法的数学模型,分析误...采用石墨炉原子吸收法测定轻烧镁中的微量铅,用国际通用的《测量不确定度表达指南》(Guide to the Ex pression of Uncertainty in Measurement, GUM)及现代数理统计学理论对分析结果进行了不确定度评定,根据测定方法的数学模型,分析误差源,推导不确定度分量,并进行计算合成,从而对轻烧镁中微量铅测定的不确定度进行了科学的评估.展开更多
基金Item Sponsored by National Natural Science Foundation of China(51074206,51074040)
文摘Calcined magnesite is a binding additive and an MgO-bearing flux for pellets production. The effects of cal- cination temperature and time on the characteristics of calcined magnesite were investigated. Experimental results in dicated that the best calcination condition was 850℃ and 1h. Under this condition, the hydration activity of the eal cined magnesite was 80.56%, and the average diameter of crystal grain D, specific surface area S and the medium particle size D50 were 25.4 nm, 45.40 m2/g and 3.41μm, respectively. This kind of calcined magnesite was a good binding additive for pellets production. At the same proportion of calcined magnesite, the effects of activities of cal cined magnesite on metallurgical properties of green pellet and indurated pellet showed that calcined magnesite with high activity could improve the dropping strength and compressive strength of green pellet and enhance the burst temperature of green pellet; however, the effects of activity on compressive strength, low-temperature reduction degradation index, reduction swelling index and reduction index of indurated pellet were not obvious.
文摘采用石墨炉原子吸收法测定轻烧镁中的微量铅,用国际通用的《测量不确定度表达指南》(Guide to the Ex pression of Uncertainty in Measurement, GUM)及现代数理统计学理论对分析结果进行了不确定度评定,根据测定方法的数学模型,分析误差源,推导不确定度分量,并进行计算合成,从而对轻烧镁中微量铅测定的不确定度进行了科学的评估.
