GUO Li-na
,
CHEN Jin
,
ZHANG Meng
,
LIANG Min
钢铁研究学报(英文版)
Thermodynamic conditions of reactions between high-carbon ferromanganese powders and gas decarbonizers like O2, CO2 and water vapor were studied by thermodynamic calculation. In O2, CO2 and water vapor atmosphere, high-carbon ferromanganese powders were decarburized in a fluidized bed. When the temperature is respectively higher than 273, 1226 and 1312 K, the gas-solid decarburization reaction will occur between ferromanganese carbide on the surface of the high-carbon ferromanganese powders and different gas decarbonizers. Since metal manganese is easy to be oxidized by O2, CO2 or water vapor, the decarburization reaction will transfer into a solid-solid phase reaction of ferromanganese carbide and ferromanganese oxide, promoting external diffusion of carbon to achieve a further decarburization of high-carbon ferromanganese powders.
关键词:
gas-solid fluidization
,
high-carbon
,
ferromanganese powders
,
gas decarbonizer
,
solid-phase decarburization
CHEN Jin
,
WANG Shebin
,
ZHANG Meng
,
LIU Jinying
,
ZHOU Jianxiong
钢铁研究学报(英文版)
The kinetics of voluminal reduction of chromium ore fines containing coal (COFCC) by microwave heating was studied. When the molar ratio of carbon to oxygen was 084 and that of CaO to SiO2 was 039 in COFCC, the temperaturerising rate of COFCC by microwave heating was 625 ℃/min, 6875 ℃/min, 7059 ℃/min, and 7222 ℃/min at 1 000 ℃, 1 100 ℃, 1 200 ℃, and 1 300 ℃, respectively. The results show that the voluminal reduction of COFCC by microwave heating at solidsolid phase is first order reaction, with the apparent activation energy of 51480 kJ/mol. The limiting step of reaction rate for the overall reaction is the mass transfer of CO in the reduced product layer between dielectric particles of chromium ore and coal.
关键词:
kinetics;microwave heating;voluminal reduction;chromium ore fine
