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Reductive Leaching of Low-Grade Pyrolusite with Formic Acid

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Abstract

The extraction of manganese from low-grade pyrolusite is investigated using formic acid as reductant in sulfuric acid medium. The effects of volumes of formic acid, concentration of sulfuric acid, liquid to solid ratio (L/S), leaching time, and temperature on leaching efficiency of manganese, iron, and aluminum are valuated with single-factor experiments. The results show that the leaching efficiency of manganese reached 90.08 pct with 80.70 pct of iron and 31.55 pct of aluminum under the optical conditions: 15 pct H2SO4(v/v) 60 ml, 4 ml formic acid, and 2 hours leaching time at 363 K (90 °C).

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Acknowledgments

This work is supported by the Innovation Project of Guangxi University for Nationalities (gxun- chx2014092),Guangxi Higher Education Institutes Talent Highland Innovation Team Scheme (GJR201147-12), and Guangxi Higher Education Institutes platform project of manganese processing.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, 530006, P.R. China

    Youzhi Lu, Aiqun Yuan, Zengwei Huang & Zeguang Zhou

  2. Guilin University of Technology at Nanning, Nanning, 530001, P.R. China

    Huaju Ma & Runjun Huang

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  1. Youzhi Lu
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  2. Huaju Ma
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  3. Runjun Huang
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  4. Aiqun Yuan
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Correspondence to Aiqun Yuan.

Additional information

Manuscript submitted November 16, 2014.

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Lu, Y., Ma, H., Huang, R. et al. Reductive Leaching of Low-Grade Pyrolusite with Formic Acid. Metall Mater Trans B 46, 1709–1715 (2015). https://doi.org/10.1007/s11663-015-0380-4

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