Dissertation > Excellent graduate degree dissertation topics show

Kinetics Study on Solid-state Decarbonization of High-carbon Ferromanganese Powder by Microwave Heating

Author: ShiWenLi
Tutor: ChenJin
School: Taiyuan University of Technology
Course: Iron and steel metallurgy
Keywords: Microwave heating Spouted fluidized High-carbon ferromanganese powder Solid phase decarbonization Dynamics
CLC: TF642
Type: Master's thesis
Year: 2011
Downloads: 87
Quote: 2
Read: Download Dissertation

Abstract

90% of the world's manganese ferroalloy consumption in the iron and steel industry, almost all the steel used in production of manganese ferro-alloys. With the continued growth of the domestic and international steel market demand, the domestic steel industry, the demand for manganese ferroalloys increased significantly. Which not only the rapid growth in demand for high-carbon ferromanganese, medium and low carbon ferromanganese demand also increased year by year. The traditional methods of production, low-carbon ferromanganese is in the liquid state, due to refining high-temperature lead to serious manganese metal evaporation, the solid phase of the high-carbon ferromanganese decarbonization has become an issue of concern. The microwave is a fast and efficient heating of powder metallurgy clean energy. As a new heating technique, a microwave heating differs from conventional heating. Conventional heating by an external heat source by heat conduction, convection and radiation in three ways of heat transfer materials outside to the inside heating, microwave heating is dependent electromagnetic properties of the material in the microwave electromagnetic field generated by changes in the volume of heating. Microwave heating with selective, timeliness, integrity, efficiency and cleanliness of the characteristics. A large number of experimental studies have shown, the microwave heating can significantly promote chemical reactions carried out. In this paper, microwave heating spouted fluidized bed and microwave heating fixed bed the decarbonization of high-carbon ferromanganese powder solid phase dynamics research, trying to study the field of microwave heating carbon ion diffusion enhanced high-carbon ferromanganese. Air flow of gas, the cold flow test of the high-carbon ferromanganese powder and microwave heating carbon ferromanganese powder hot fluidized the decarbonization test study on this basis. Cold fluidized tests showed that spouted fluidized bed fluidized bed is more suitable for high-carbon ferromanganese powder flow operation, the spout-fluid bed test material weight 500 g corresponding best fluidizing gas flow rate of 0.4 m3 · h-1; optimum fluidizing gas flow corresponding to the material weight of 750 g for 0.8 m3 · h-1. Microwave heating carbon ferromanganese powder thermal state fluidized decarburization test show that the material weight of 750 g, air flow rate of 1.0 m3 · h-'microwave heating temperature of 500 to 600 ° C, holding time 60 min, high-carbon ferromanganese containing 1.0% reduction in the amount of carbon; microwave heating temperature of 700 to 800 ° C, holding time 60 mmin, high-carbon ferromanganese lower carbon content of about 1.4%. In the field of microwave heating, the holding time on high-carbon ferromanganese decarbonization is not significant, and the the decarburization temperature of the carbon ferromanganese decarbonization significant. Calcium carbonate powder decarbonizer high-carbon ferromanganese powder solid - solid phase decarburization test. In C: CO2 as a 1:1 under the conditions of microwave heating the material to 900 ° C, 1000 ° C, 1100 ° C, 1200 ° C, and at each temperature were incubated 0 min, 20 mmin, 40 min, 60 min. The test results show that, along with the increase in temperature of the microwave heating and the holding time increases, the decarburization effect of high-carbon ferromanganese powder is getting better. C: CO2 as 1:1.8 conditions were mixed and were placed in the microwave furnace and a muffle furnace, heated to 900 ° C to 1000 ° C, 1100 ° C, 1200 ° C, holding time 60 min, de- carbon comparison test. Experimental results show that the microwave heating efficiency is much higher than conventional heating efficiency. In the same ratio of raw materials, the decarburization temperature and time conditions, the decarburization effect decarburization effect of microwave heating is superior to the conventional heating, microwave heating the metal loss in the high-carbon ferromanganese powder after decarburization rate is lower than the conventional heating decarbonization of carbon ferromanganese powder metal loss rate.

Related Dissertations

CLC: > Industrial Technology > Metallurgical Industry > Ferroalloy smelting > All kinds of ferroalloy smelting > Ferromanganese and manganese alloy
© 2012 www.DissertationTopic.Net Mobile