JIANG Hai-bing
,
ZHANG Jian-liang
,
FU Jian-xun
,
CHANG Jian
,
LI Jing
钢铁研究学报(英文版)
The properties of mixed coals were studied on the basis of known various properties of the injecting coals in the treatise. The structure of the injecting coals was optimized and put into practical application. It was found that the ignition point was lowered with mixed coals, however, both combustibility and grindability were improved, and explosibility of the mixed coals were decreased as well. Hence, mixed coals injection not only can improve the amount of the injecting coals greatly, but also improve the economical and technical indexes of the blast furnace.
关键词:
blast furnace
,
pulverized coal
,
property
,
injection
ZHANG Zuotai
,
LI Jing
,
LIU Peng
钢铁研究学报(英文版)
The timetemperaturetransformation (TTT) diagrams of fluoridefree mold fluxes containing TiO2/ZrO2 were constructed through the confocal scanning laser microscope (CSLM) technique. It was found that the crystallization temperature of Ffree mold fluxes containing TiO2 or ZrO2 increases, while incubation time decreases with increasing basicity. The crystallization tendency increases with the zirconia addition in slag melt, as it may be thought that the addition solubility is limited in molten slag and the solid particles act as heterogeneous nucleation sites. Three types of crystal morphologies were observed, corresponding to different crystallization mechanisms. CaSiO3 and Ca3Si2O7 precipitate in the slag with low basicity, and Ca2SiO4 was formed with increasing basicity. The addition of TiO2 promotes the precipitation of CaTiO3. The logarithm of crystal growth rate increased with increasing isothermal temperature, suggesting that the crystal/melt interface reaction is the controlling step in the present experiment.
关键词:
crystallization
,
fluoridefree mold flux
,
TTT diagram
,
ZrO2
,
TiO2
