HUANG Zhu-cheng
,
WU Kai
,
HU Bing
,
PENG Hu
,
JIANG Tao
钢铁研究学报(英文版)
The microwave heating characteristics of the mixture with oxidized pellet and coal was studied, and the non-isothermal reduction dynamics is discussed. The results show that, the slow-heating stage of the temperature rising process can be segmented into two heating temperature curves approximately that have good linear relationship. They can be seen as temperature programming. In the first stage, between 827 and 1073 K, the reaction mechanism obeys diffusion controlled model. In the second stage, between 1093 and 1323 K, the reaction mechanism also obeys diffusion controlled model. The apparent activation energies are found to be 7513 kJ/mol for the first stage and 5317 kJ/mol for the second stage. That is lower than the apparent activation energy under conventional heating. The microstructure of the reduced pellets shows that microwave can improve the kinetics of the reduction. Microwave has anxo-action to the reaction obviously.
关键词:
microwave
,
oxidized pellet
,
non-isothermal kinetics
师广岭
,
张海波
,
兰园钢
,
尚海涛
硅酸盐通报
使用微波加热法研究了水解聚马来酸酐(HPMA)与聚乙二醇单甲醚(MPEG)合成助磨剂的效果,试验了加热时间和原料配比对合成助磨剂效果的影响,助磨剂掺量对助磨效果和水泥胶砂性能的影响.结果表明,微波加热法可以在20 min内使反应充分进行,HPMA与MPEG质量比为2∶1时助磨效果最佳.所合成助磨剂的掺量为粉磨物料量的0.1％时,助磨效率高,继续增加掺量助磨效率提高不明显.助磨剂可以提高水泥砂浆流动度,而且对早期胶砂强度提高明显,对后期强度也有提高,但效果不明显.
关键词:
微波
,
水解聚马来酸酐
,
助磨剂
,
强度
