Optimization of Gold Dissolution Parameters in Acidified Thiourea Leaching Solution with Hydrogen Peroxide as an Oxidant: Implications of Roasting Pretreatment Technology

Munganyinka, Jeanne Pauline; Habinshuti, Jean Baptiste; Komadja, Gbétoglo Charles; Uwamungu, Placide; Tanvar, Himanshu; Ofori-Sarpong, Grace; Mishra, Brajendra; Onwualu, Azikiwe Peter; Shuey, S.A.

doi:10.3390/met12101567

Cited by 4 publications

(2 citation statements)

References 47 publications

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“…In most cases, the geostatistical methods for the three-dimensional interpolation of spatial data are performed on the basis of stochastic methods (kriging) [ 38 ] in pure form or in combination with machine learning (for example, ANN [ 39 ] or random forest method [ 40 ]). Thus, the use of “classical” deterministic methods (for example, the k-nearest neighbor method or the finite elements method) is significantly reduced.…”

Section: Methodsmentioning

confidence: 99%

Tailings Utilization and Zinc Extraction Based on Mechanochemical Activation

et al. 2023

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The significant containment of the global mining industry is caused by the problem of the transition to sustainable metal extraction and the integrated use of technogenic raw materials from the tailings of ore processing. The modeling of metal leaching processes using mechanical activation of polymetallic raw material components is particularly important in expanding the application of mining tailings as inert fillers of filling mixtures. This study is aimed at detecting the rotor speed factor on the chemical and mechanochemical effect of zinc yield growth from polymetallic tailings of the mining industry. In this regard, the purpose of this study was to improve the modeling of metal leaching processes using mechanical activation by improving the compositions of the filling mixtures. The methodology of the work included several comprehensive studies: the mechanical activation of tailings during zinc leaching from pulp in the DESI-11 disintegrator; the activation of enrichment tailings and the formation of a filling mass with different parameters of the component composition; the curing of cubic samples and their testing on the IP-1250 press. The Vi Improved text editor was used to prepare the algorithms for deterministic methods of three-dimensional interpolation in the Python language. The experimental results were graphically displayed using Gnuplot. The study of the agitation leaching of the waste obtained from the Sadonskiy mining district results in the fact that the NaCl mass concentration decreased from 13 to 1% and the H2SO4 concentration stabilization within 0.5 to 0.6% led to a 3-time increase in the zinc yield from the pulp, according to the polynomial law (from 28 to 91%). The obtained results expand the idea of the mechanism of the strength gain by the filling mass under mechanical activation on the components of the filling mixture, as well as changes in the efficiency of zinc leaching at different ratios of two types of lixiviants (sulphuric acid and sodium chloride) in the leaching solution.

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Section: Methodsmentioning

confidence: 99%

Tailings Utilization and Zinc Extraction Based on Mechanochemical Activation

et al. 2023

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“…En esta reacción, el oro se oxida desde su estado elemental hasta un estado de oxidación "+3", formando un complejo de tiourea de oro. El proceso es más rápido que la lixiviación con cianuro, pues la tiourea es un agente oxidante más fuerte (Munganyinka et al, 2022).…”

Section: Tioureaunclassified

Una Comparación de Reactivos Alternos al Cianuro como Lixiviantes del Oro: Una revisión

Galvan Lira,

Soria Aguilar,

Carrillo Pedroza

et al. 2023

Ciencia Latina

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El oro es un metal de gran interés en áreas como la ingeniería, la joyería y las finanzas, es por ello por lo que hay un gran interés en la investigación de técnicas de recuperación de oro de diversas fuentes, como los minerales o los desechos electrónicos. Existen múltiples solventes que son capaces de formar complejos con el oro, como por ejemplo el iodo, tiourea, tiosulfato, tiocianato, glicina y el cianuro; este último siendo el más utilizado a escala industrial. En el presente artículo se revisan los reactivos más utilizados para la lixiviación del oro analizando su panorama mediante herramientas de mapeo bibliográfico en los últimos 5 años, usando estas herramientas se concluye que a pesar la relevancia con la que cuentan los sistemas libres de cianuro para la disolución de oro, el cianuro seguirá siendo relevante tanto industrialmente por sus ventajas operativas y económicas como en materia científica buscando formas de mitigar sus efectos dañinos.

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