Abstract
The reductive leaching of manganese from mixed zinc–carbon and alkaline battery powder using guar meal as a new reducing agent in a sulfuric acid medium was investigated. The effects of the sulfuric acid concentration, amount of guar meal, leaching temperature, leaching time, and stirring speed were tested. The optimal leaching conditions for −88 μm particles were determined to be a sulfuric acid concentration of 2 mol L–1, a guar meal concentration of 100 g L–1, a stirring speed of 400 rpm, a leaching time of 180 min, and a leaching temperature of 70 °C. Under these conditions, 99.7% of the manganese was leached. The zinc was almost completely dissolved without a reducing agent because zinc oxide dissolved directly in the sulfuric acid medium. The SEM–EDX, FT-IR, and XRD results showed that no manganese-containing phases were detected in the remaining leach residue.
Published Version
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