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Minerals 2017, 7(5), 83; doi:10.3390/min7050083

Kinetic Study of the Leaching of Low-Grade Manganese Ores by Using Pretreated Sawdust as Reductant

School of Metallurgy, Northeastern University, Shenyang 110819, China
Author to whom correspondence should be addressed.
Academic Editor: M. Thaddeus Ityokumbul
Received: 30 March 2017 / Revised: 10 May 2017 / Accepted: 17 May 2017 / Published: 20 May 2017
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The reductive leaching of manganese from a low-grade manganese oxide ore was investigated by using pretreated sawdust as the reductant in a sulfuric acid medium. The effects of stirring speed, liquid/solid ratio, sawdust/ore mass ratio, sulfuric acid concentration, reaction temperature, and time on the manganese extraction were examined. It was found that the leaching efficiency is strongly dependent on temperature and acid concentration. The leaching efficiency of manganese reached 94.1% under the optimal conditions: stirring speed of 300 rpm, liquid/solid ratio of 8:1, mass ratio of sawdust to ore 0.25, sulfuric acid concentration of 1 mol/L and a temperature of 363 K for 180 min. The kinetic analysis was carried out based on the shrinking core model, which indicated that the reductive leaching process was controlled by the chemical reaction. The reaction orders with respect to the sulfuric acid concentration and mass ratio of sawdust are 1.66 and 0.57, respectively. The apparent activation energy for the leaching process has been calculated using the Arrhenius expression and was found to be 51.7 kJ/mol. View Full-Text
Keywords: low-grade manganese ore; pretreated sawdust; reductive leaching; kinetic study low-grade manganese ore; pretreated sawdust; reductive leaching; kinetic study

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Sun, Y.; Fu, G.; Jiang, L. Kinetic Study of the Leaching of Low-Grade Manganese Ores by Using Pretreated Sawdust as Reductant. Minerals 2017, 7, 83.

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