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
The Changshu earthquake (M_s = 5.1) occurred at 17:57 (GMT, hereinafter) on Feb. 9, 1990, and it was sensible around Shanghai, Wuxi and some other places. The epicenter was at 31.6°N, 121°E. We predicted on ...The Changshu earthquake (M_s = 5.1) occurred at 17:57 (GMT, hereinafter) on Feb. 9, 1990, and it was sensible around Shanghai, Wuxi and some other places. The epicenter was at 31.6°N, 121°E. We predicted on Feb. 6, 1990 that there would be an earthquake with magnitude 5—6 in the south Huanghai Sea-north Jiangsu Province region, There were a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The Changshu earthquake (M_s = 5.1) occurred at 17:57 (GMT, hereinafter) on Feb. 9, 1990, and it was sensible around Shanghai, Wuxi and some other places. The epicenter was at 31.6°N, 121°E. We predicted on Feb. 6, 1990 that there would be an earthquake with magnitude 5—6 in the south Huanghai Sea-north Jiangsu Province region, There were a
