A continuous-flow reactor for the precipitation of tellurium

Jennings, P.H.; Themelis, Nickolas J.; Stratigakos, E.S.

doi:10.1179/cmq.1969.8.3.281

Cited by 9 publications

(1 citation statement)

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“…On top of that, precipitation of Te VI with sulfur dioxide requires an autoclave and is optimal at low acidities . However, the reduction of Te VI /Te IV is favored at high acidities . Cuprous, unlike sulfur dioxide gas, performs better at high acidities, and the reaction only requires atmospheric pressure and a low temperature.…”

Section: Introductionmentioning

confidence: 99%

Reduction Mechanism of Tellurium Species from Copper Electrowinning Solutions

Mokmeli

Dreisinger

Wassink

et al. 2016

Int J of Chemical Kinetics

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The presence of tellurium in copper–nickel sulfide ores results in downstream contamination of leach solutions and electrolytes. Tellurium must be removed from leach solutions before electrowinning to prevent contamination of copper cathodes. Cuprous ion is industrially used as a reductant to remove tellurium ions. However, the reduction kinetics of tellurium ions with cuprous is not well known. In this study, the slow TeVI reduction step with cuprous was identified and a plausible TeVI reduction mechanism was suggested. The rate‐determining step was investigated by studying the kinetics of the coupled reaction of TeVI and TeIV with cuprous. The rate law suggested for the reduction of TeIV with cuprous and the coupled kinetics equation for consecutive reduction reactions of TeIV and TeVI were derived. It was shown that the rate constant of the coupled reaction is very close to the rate constant calculated based on the assumption that TeVI reduction is a rate‐determining step.

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Section: Introductionmentioning

confidence: 99%