Bioleaching of indium from waste LCD panels by Aspergillus niger: Method optimization and mechanism analysis.

The Science of the Total Environment
Jiaying CuiZhi Dang

Abstract

Using Aspergillus niger (A. niger) to produce low-concentration organic acids is challenging for dissolving In3O2 from waste LCD (liquid crystal display) panels with high toxicity. In this study, three bioleaching approaches from the general and the optimized fermentation systems were investigated respectively to compare indium recovery effects and firstly clarified its bioleaching mechanism. The indium bioleaching efficiency can be improved from 12.3% to 100% by fermentation method optimization. Carboxy groups from organic acids and proteins were the critical substances to release H+ for leaching indium mainly competed with iron via reactions analysis. The effective components increased after optimizing, including the dissociative H+ concentration, the effective carboxyl groups for leaching metal oxides, and the output of oxalic acid. A. niger biomass prevented the contact between H+ and In3O2 and adsorbed In3+ adverse to indium recovery. The bioleaching effects of fermentation broth for indium can be further promoted by controlling bioleaching process parameters.

References

Jun 5, 2004·Journal of Hazardous Materials·Catherine N MulliganBernard F Gibbs
Feb 24, 2009·Journal of Hazardous Materials·Wan-Xia RenXiao-Jun Li
Feb 24, 2009·Journal of Hazardous Materials·Dominica Del Mundo DaceraPreeda Parkpian
Apr 30, 2015·Waste Management·A V M SilveiraD A Bertuol
Nov 21, 2015·Waste Management·Min-Ji KimGyu-Hyeok Kim
Aug 12, 2016·Angewandte Chemie·Peter FröhlichMartin Bertau
Nov 28, 2018·The Science of the Total Environment·Yaling XieFeng Zhao

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