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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.

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