CAJ | 학술논문

研究真空铝热还原煅烧白云石和煅烧菱镁石的混合物炼镁过程的动力学，提出一种满足真空铝热过程的等温还原方法。实验在4 Pa的真空下进行。实验结果表明：还原率随着温度、制团压力和铝粉添加量的提高而增加。对不同还原时间的还原渣进行 XRD 分析，结果表明，还原过程能够粗略地分为3个阶段：MgAl2O4和Ca12Al14O33的形成阶段；CaAl2O4的生成阶段；CaAl4O7的形成阶段。根据动力学模型将获得的实验数据分为3部分，这3部分的活化能分别为98.2、133.0和223.3 kJ/mol。
연구진공려열환원단소백운석화단소릉미석적혼합물련미과정적동역학，제출일충만족진공려열과정적등온환원방법。실험재4 Pa적진공하진행。실험결과표명：환원솔수착온도、제단압력화려분첨가량적제고이증가。대불동환원시간적환원사진행 XRD 분석，결과표명，환원과정능구조략지분위3개계단：MgAl2O4화Ca12Al14O33적형성계단；CaAl2O4적생성계단；CaAl4O7적형성계단。근거동역학모형장획득적실험수거분위3부분，저3부분적활화능분별위98.2、133.0화223.3 kJ/mol。
The vacuum aluminothermic reduction of the mixture of calcined magnesite and calcined dolomite was studied. An isothermal reduction method satisfying the vacuum aluminothermic reduction was proposed. The experiments were carried out at 4 Pa. The results indicate that the reduction rate is increased with increasing temperature, content of aluminum and pellet forming pressure. The XRD patterns of pellets at different reduction stages confirm that the reduction process can be roughly classified into three stages:the formation of MgAl2O4, and Ca12Al14O33 phases;the phase transformation from MgAl2O4 and C12A7 to CaAl2O4;the formation of CaAl4O7 phase. The experimental data were divided into three parts according to the kinetic models. The apparent activation energies of the three parts were determined to be 98.2, 133.0 and 223.3 kJ/mol, respectively.