CAJ | 학술논문

采用微波加热对高碳铬铁粉固相脱碳进行了动力学研究.以碳酸钙粉为固体脱碳剂，按高碳铬铁粉中碳与碳酸钙粉完全分解后产生的 CO2的摩尔比为1︰1和1︰1.4混合，在微波场中对内配碳酸钙高碳铬铁粉加热到不同温度并保温脱碳一定时间，测定其碳含量并计算固相脱碳反应的表观活化能.实验表明：提高内配碳酸钙的比例，物料的脱碳率会相应提高，但混合物料的微波加热升温速率会变小；对于脱碳摩尔比相同的物料，随着脱碳温度的提高和保温时间的延长，物料的脱碳率随之提高.当1200℃保温脱碳60 min时，两种脱碳摩尔比下物料脱碳效果最好，脱碳率分别为65.56%和82.96%.微波场能促进高碳铬铁粉中碳的活化扩散和 CO2的吸附扩散.微波加热内配碳酸钙高碳铬铁粉固相脱碳反应近似为一级反应，脱碳反应的表观活化能为68.43 kJ·mol-1.
채용미파가열대고탄락철분고상탈탄진행료동역학연구.이탄산개분위고체탈탄제，안고탄락철분중탄여탄산개분완전분해후산생적 CO2적마이비위1︰1화1︰1.4혼합，재미파장중대내배탄산개고탄락철분가열도불동온도병보온탈탄일정시간，측정기탄함량병계산고상탈탄반응적표관활화능.실험표명：제고내배탄산개적비례，물료적탈탄솔회상응제고，단혼합물료적미파가열승온속솔회변소；대우탈탄마이비상동적물료，수착탈탄온도적제고화보온시간적연장，물료적탈탄솔수지제고.당1200℃보온탈탄60 min시，량충탈탄마이비하물료탈탄효과최호，탈탄솔분별위65.56%화82.96%.미파장능촉진고탄락철분중탄적활화확산화 CO2적흡부확산.미파가열내배탄산개고탄락철분고상탈탄반응근사위일급반응，탈탄반응적표관활화능위68.43 kJ·mol-1.
Solid-state decarburization kinetics of high-carbon ferrochrome powders was investigated by microwave heating. Calcium carbonate powders were used as a solid decarburizer. The high-carbon ferrochrome powders and calcium carbonate powders were mixed at the mole ratio between carbon in the high-carbon ferrochrome powders and CO2 decomposed from the calcium carbonate powders of 1︰1 and 1︰1.4. Then the mixtures were heated at different temperatures and decarburized in a microwave heating field. The carbon content of decarburized materials was measured and the apparent activation energy of decarburization reaction was calculated. Experimental results show that as the proportion of calcium carbonate in the mixtures enlarges, the decarburization rate increases, but the heating rate of the mixtures decreases. The decarbonization rate is higher at a higher temperature and for a longer holding time at the same mole ratio. The highest decarbonization rates are 65.56%and 82.96%for both the mixtures decarburized at 1200℃for 60 min, respectively. Carbon activation diffusion and CO2 adsorption diffusion in the high-carbon ferrochrome powders are enhanced in a microwave heating field. Solid-phase decarburization approximates the first-order reaction and the apparent activation energy of decarburization reaction is 68.43 kJ·mol-1.