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Master's Dissertation
DOI
10.11606/D.3.2009.tde-18112009-083224
Document
Author
Full name
Edmilson Renato de Castro
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Mourão, Marcelo Breda (President)
Senise, José Thomaz
Takano, Cyro
Title in Portuguese
Contribuição ao desenvolvimento da redução carbotérmica de óxidos metálicos empregando energia de microondas.
Keywords in Portuguese
Processos metalúrgicos
Tecnologia de microondas
Abstract in Portuguese
O presente trabalho apresenta um equipamento para o processamento de reduções carbotérmicas sob campo de micro-ondas, permitindo pleno controle da potência fornecida e da medida da energia de micro-ondas efetivamente aplicada à carga em processo de redução podendo assim realizar balanços de energia e determinação de taxa de reação com altos níveis de confiança. O equipamento permite, sobretudo, a medida simultânea de temperatura e de massa do material sob redução, e a fácil reprodutibilidade das condições de ensaio. O protótipo opera com um gerador de micro-ondas de 2.45 GHz e potência variável até 3000 W. A amostra é mantida sob atmosfera de argônio. Nos testes operacionais do protótipo procedeu-se à redução carbotérmica de minério de ferro de Carajás, utilizando coque de petróleo como redutor através de pelotas esféricas com massa de 3,5 g e diâmetro de 15 mm. Obtiveram-se curvas cinéticas de redução de minério de ferro e de consumo de energia durante o processo. Os dados colhidos com este protótipo permitiram realizar uma análise da energia de micro-ondas efetivamente consumida na redução do minério.
Title in English
Contribution to the development of the carbothermic reduction of metal oxides using microwave energy.
Keywords in English
Carbothermic reduction
Iron ore
Microwaves
Abstract in English
This work presents of a device for microwave enhanced carbothermic reductions which permits the full control of microwave power irradiated, the measurement of effectively applied microwave power to the charge in process thus performing a high confidence determination of rate of reaction and energy balance. In particular, the simultaneous records of its temperature and mass loss, and good reproducibility of operation parameters, are obtainable. This prototype works with a 2.45 GHz microwave generator with variable power up to 3000 W. Samples are processes under argon gas atmosphere. Operational tests for Carajás iron ore reduction with petroleum coke were performed using spherical pellets with weight of 3,5 g and diameter of 15 mm. Kinetic curves of iron ore reduction and effective consumption of microwave power curves were determined. These results made possible to perform an analysis of actual energy consumption for enhanced microwave iron ore carbothermic reduction.
 
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Publishing Date
2010-05-18
 
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