Jin Zuomei, Wen Wen
The kinetics of dissolution of nickel matte in the presence of manganese dioxide with silver ions was investigated to evaluate the catalytic effects on the leaching rate. Experimental conditions including stirring, temperature, particle size, and concentrations of manganese dioxide, silver, and ferric ions were systematically studied. Results indicated that silver ions enhanced the leaching rate by up to a factor of 17, and the dissolution process followed a topochemical reaction model consistent with surface reaction control. The activation energy determined was 39.15 kJ/mol, and it was found that while the leaching rate of Ni3S2 was independent of stirring rate, the reaction rate constant was inversely proportional to the initial particle diameter. Kinetic analysis revealed orders of reaction rates of 0.41, 0.69, and 0.33 with respect to Ag+, Mn4+, and Fe'+ concentrations respectively, leading to the formulation of a kinetic rate equation. Additionally, a proposed mechanism of silver-catalyzed leaching involving three intermediate reactions was presented, highlighting that the reaction between Fe ions and intermediate products such as Ag2S and Ag is the rate-controlling step.
@article{7889ed8c-239f-450a-8032-044811a95362,
title={Silver ion catalysis in leaching of Nickel Matte},
author={Jin Zuomei and Wen Wen},
year={1990},
language={en}
}TY - JOUR TI - Silver ion catalysis in leaching of Nickel Matte AU - Jin Zuomei AU - Wen Wen PY - 1990 LA - en ER -
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