Influence des propriétés superficielles de la pyrite sur la rétention de molécules organiques soufrées : application à la désulfuration des résidus miniers

Abstract : aA relatively new management technique for mine tailings, called environmental desulphurization', has been considered in recent years. This method consists in extracting from the mine tailings the minerals which are responsible for acidic mine drainage and metallic contamination in seepage. Desulphurization typically uses non selective flotation of sulphides. This project studies the mechanisms of collector adsorption onto the sulphide surfaces under the conditions of the environmental desulphurization. The surface modifier is an organic molecule composed of a thiol group and a hydrophobic carbon chain called xanthate. The adsorption of those surfactants onto the solid particles depends on numerous chemical parameters (pH, Eh, ionic composition and concentration, dissolved O2 and CO2...) as well as solid characteristics (oxidation level, surface states, metal/sulfur ratio, elemental and mineral impurities...). The first part of the study consisted in characterizing two residual pulps from base-metal Canadian mines (solid and liquid phases, and mineral surfaces), in order to determine the pulp conditions before desulphurization. A fundamental study of mineral-surfactant interactions under flotation conditions give information on the surface species that form onto the surfaces of a pure pyrite. The stages of depression, reactivation, and flotation of the pyrite are specifically studied to understand the surface mechanisms involved in xanthate-pyrite interaction and in pyrite flotation. These mechanisms are then validated using an industrial mine tailing prepared with a grinding-flotation laboratory circuit designed for the project. The main objective of these tests was to optimize the desulphurization process and produce a final tailing with no potential for acid mine drainage generation
Document type :
Theses
Complete list of metadatas

Cited literature [6 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01752505
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 1:49:50 PM
Last modification on : Wednesday, July 25, 2018 - 1:22:33 AM

File

2005_MERMILLOD-BLONDIN_R_1.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01752505, version 1

Collections

Citation

Raphaël Mermillod-Blondin. Influence des propriétés superficielles de la pyrite sur la rétention de molécules organiques soufrées : application à la désulfuration des résidus miniers. Autre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL097N⟩. ⟨tel-01752505⟩

Share

Metrics

Record views

39

Files downloads

224