Abstract
Manganese dioxide ores were given a reducing roast and then leached with an acid solution of ammonium sulfate. Iron and arsenic were removed from the leach solution by oxidation with hydrated manganese dioxide slimes. In the manganese deposition cell, lead anodes and 17 per cent chromium steel cathodes were used. A diaphragm of canvas divided the cell into two compartments. Cathodes were stripped every two days. The data are limited to the effect of concentration on cell resistance or rate of heat generation. Provided the (NH4)2SO4 concentration is 125 g./L. or higher, and the current density is less than 3.2 amp./dm.2, there is little to be gained or lost with change in (NH4)2SO4 concentration.
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