Abstract
The present work shows that the rate of a chemical reaction can be enhanced by application of electric field and the reaction temperature can be lowered significantly. Roasting is a metallurgical process where metal sulphides transform into metal oxide when heated in presence of air. Conventional roasting of zinc sulphide (ZnS) requires high temperatures (>800 °C) and is a sluggish process. Field-induced roasting and densification occurred together at a furnace temperature as low as 650 °C in <10 s. Interrupted experiments in stage III of flash showed that cubic ZnS first transformed to hexagonal ZnS at ∼ 844 °C (which appears above 1020 °C) before transforming to ZnO. The hexagonal phase was retained at room temperature only if the flash was turned off in <5 s. This study introduces a new method for speeding up chemical reactions using electric fields, which is both fast and energy efficient.
Published Version
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