No abstract

No abstract

This paper presents the results of a study on carbothermal reduction of iron ore made under the microwave field in equipment specially developed for this purpose. The equipment allows the control of radiated and reflected microwave power, and therefore measures the microwave energy actually applied to the load in the reduction process. It also allows performing energy balances and determining the reaction rate with high levels of confidence by simultaneously measuring temperature and mass of the material upon reduction with high reproducibility. We used a microwave generator of 2.45 GHz with variable power up to 3000 W. Self‐reducing pellets under argon atmosphere, containing iron ore and petroleum coke, with 3.5 g of mass and 15 mm of diameter were declined. We obtained the kinetic curves of reduction of iron ore and of energy consumption to the process in the maximum electric field, in the maximum magnetic field and at different values of power/mass. The data allow analyzing how the microwave energy was actually consumed in the reduction of ore.

No abstract

An explor ator y test of dr ying zinc sulfate heptahydr ate was per for med to compare the efficiency of a microwave dr yer and an infrared dr yer. M oisture content was deter mined by titrating with EDTA the level of zinc in the sample. Results show that microwave dr ying is more efficient than infrar ed dr ying. A 95 % r eduction in dr ying time and a 7 % higher r emoval of water was obtained with microwave dr ying.Index Terms Drying, microwave industrial applications, zinc sulfate.