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Metals 2015, 5(3), 1520-1542; doi:10.3390/met5031520

Tannins in Mineral Processing and Extractive Metallurgy

Kroll Institute for Extractive Metallurgy, Colorado School of Mines, Golden, CO 80401, USA
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Academic Editor: Suresh Bhargava
Received: 28 July 2015 / Revised: 18 August 2015 / Accepted: 21 August 2015 / Published: 27 August 2015
(This article belongs to the Special Issue Hydrometallurgy)
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Abstract

This study provides an up to date review of tannins, specifically quebracho, in mineral processing and metallurgical processes. Quebracho is a highly useful reagent in many flotation applications, acting as both a depressant and a dispersant. Three different types of quebracho are mentioned in this study; quebracho “S” or Tupasol ATO, quebracho “O” or Tupafin ATO, and quebracho “A” or Silvafloc. It should be noted that literature often refers simply to “quebracho” without distinguishing a specific type. Quebracho is most commonly used in industry as a method to separate fluorite from calcite, which is traditionally quite challenging as both minerals share a common ion—calcium. Other applications for quebracho in flotation with calcite minerals as the main gangue source include barite and scheelite. In sulfide systems, quebracho is a key reagent in differential flotation of copper, lead, zinc circuits. The use of quebracho in the precipitation of germanium from zinc ores and for the recovery of ultrafine gold is also detailed in this work. This analysis explores the wide range of uses and methodology of quebracho in the extractive metallurgy field and expands on previous research by Iskra and Kitchener at Imperial College entitled, “Quebracho in Mineral Processing”. View Full-Text
Keywords: quebracho; tannin; flotation; fluorite; germanium; precipitation; Tupasol quebracho; tannin; flotation; fluorite; germanium; precipitation; Tupasol
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Rutledge, J.; Anderson , C.G. Tannins in Mineral Processing and Extractive Metallurgy. Metals 2015, 5, 1520-1542.

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