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采用微波加热和常规加热对硅锰粉和巴西粉锰的脱硅反应进行了动力学行为研究,以巴西粉锰为脱硅剂,与硅锰粉中的硅发生氧化还原反应.微波加热和常规加热分别加热到不同温度并保温一定时间,测定产物中硅含量并计算固相脱硅反应的表观活化能.实验表明:单一和混合料均可在微波场中快速升温.随着温度的升高和保温时间的延长,两种加热方式脱硅率均随之提高,在相同实验条件下,微波加热的脱硅率和反应速率均高于常规加热,微波加热可以提高固相脱硅率;微波加热固相脱硅反应的限制性环节为扩散环节,其表观活化能为102.93 k J·mol~(-1),常规加热脱硅反应的表观活化能为180 k J·mol~(-1),说明微波加热能改善固相脱硅的动力学条件,提高固相脱硅反应速率,降低脱硅反应的活化能.
The desulphurization reaction of silicomanganese powder and Brazilian powder manganese was studied by microwave heating and conventional heating. The powdery manganese was used as the desilication agent to react with silicon in silicomanganese powder. Microwave heating and conventional Heating were heated to different temperatures and incubated for a certain period of time, the determination of silicon content in the product and calculate the apparent activation energy of the solid-phase desiliconization reaction experiments show that: a single and the mixture can be quickly heated in the microwave field with the temperature rise High temperature and holding time, the desiliconization rates of the two heating methods both increase. Under the same experimental conditions, the silicon removal rate and reaction rate of microwave heating are higher than those of conventional heating, microwave heating can increase the rate of solid phase silicon removal; The activation energy of microwave heating was about 102.93 kJ · mol -1 in the diffusion process, and the apparent activation energy of the conventional thermal desilication reaction was 180 kJ · mol ~ (-1) -1), indicating that microwave heating can improve the kinetics of solid-phase desilication, improve the solid-phase desilication reaction rate and reduce the activation energy of the desiliconization reaction.