Selective inhibitory effect on flotation caused by microwave irradiation on Myanmar black ore

Kazumasa Takahashi, Changzhi Liu, Than Win Maung, Mitsuaki Matsuoka, Giuseppe Granata, Chiharu Tokoro

Research output: Contribution to conferencePaper

Abstract

In these days, base metal demand of the world are increasing, however, grade of ore has been decreased. Therefore, the mineral processing of low grade ore and refractory ore are required to be developed more and more. Microwave irradiation has attracted attention as a method to promote liberation of ores and bring selective reaction such as surface oxidation. This research is studied flotation behavior after microwave irradiation to black ore. It has been confirmed that pyrite (FeS 2 ) and galena (PbS) are selectively inhibited by irradiating microwave to the Myanmar black ore in bulk flotation. It is suggested that the two minerals were selectively oxidized by microwaves and inhibited in flotation process. It was confirmed that not pyrite but chalcopyrite and galena have high reactivity to microwaves and generate heat above 600 °C. Mineral specimens of pyrite and galena were irradiated with microwave in prescribed conditions, and the change of the surface morphology was confirmed by Xray diffraction (XRD), Xray Photoelectron Spectroscopy (XPS) and Xray absorption fine structure (XAFS) analysis. From the measurement results, the presence of lead sulfite (PbSO 4 ) was confirmed from the galena irradiated with microwave. Therefore, oxidation reaction occurred by irradiation with microwave, and galena changed to lead sulfite, so it was inhibited by flotation. On the other hand, oxidation was not confirmed in pyrite. It is suggested that it was oxidized by heat from the other high reactive minerals like chalcopyrite or galena.

Original languageEnglish
Publication statusPublished - 2017 Jan 1
Event14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017 - Sapporo, Hokkaido, Japan
Duration: 2017 Sep 262017 Sep 29

Conference

Conference14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017
CountryJapan
CitySapporo, Hokkaido
Period17/9/2617/9/29

Fingerprint

irradiation
galena
pyrite
sulfite
chalcopyrite
oxidation
mineral
ore grade
effect
ore
flotation
microwave
mineral processing
base metal
diffraction
spectroscopy

Keywords

  • Assist grinding
  • Black ore
  • Flotation
  • Microwave
  • Mineral processing

ASJC Scopus subject areas

  • Environmental Science(all)

Cite this

Takahashi, K., Liu, C., Maung, T. W., Matsuoka, M., Granata, G., & Tokoro, C. (2017). Selective inhibitory effect on flotation caused by microwave irradiation on Myanmar black ore. Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.

Selective inhibitory effect on flotation caused by microwave irradiation on Myanmar black ore. / Takahashi, Kazumasa; Liu, Changzhi; Maung, Than Win; Matsuoka, Mitsuaki; Granata, Giuseppe; Tokoro, Chiharu.

2017. Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.

Research output: Contribution to conferencePaper

Takahashi, K, Liu, C, Maung, TW, Matsuoka, M, Granata, G & Tokoro, C 2017, 'Selective inhibitory effect on flotation caused by microwave irradiation on Myanmar black ore' Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan, 17/9/26 - 17/9/29, .
Takahashi K, Liu C, Maung TW, Matsuoka M, Granata G, Tokoro C. Selective inhibitory effect on flotation caused by microwave irradiation on Myanmar black ore. 2017. Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.
Takahashi, Kazumasa ; Liu, Changzhi ; Maung, Than Win ; Matsuoka, Mitsuaki ; Granata, Giuseppe ; Tokoro, Chiharu. / Selective inhibitory effect on flotation caused by microwave irradiation on Myanmar black ore. Paper presented at 14th International Symposium on East Asian Resources Recycling Technology, EARTH 2017, Sapporo, Hokkaido, Japan.
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AB - In these days, base metal demand of the world are increasing, however, grade of ore has been decreased. Therefore, the mineral processing of low grade ore and refractory ore are required to be developed more and more. Microwave irradiation has attracted attention as a method to promote liberation of ores and bring selective reaction such as surface oxidation. This research is studied flotation behavior after microwave irradiation to black ore. It has been confirmed that pyrite (FeS 2 ) and galena (PbS) are selectively inhibited by irradiating microwave to the Myanmar black ore in bulk flotation. It is suggested that the two minerals were selectively oxidized by microwaves and inhibited in flotation process. It was confirmed that not pyrite but chalcopyrite and galena have high reactivity to microwaves and generate heat above 600 °C. Mineral specimens of pyrite and galena were irradiated with microwave in prescribed conditions, and the change of the surface morphology was confirmed by Xray diffraction (XRD), Xray Photoelectron Spectroscopy (XPS) and Xray absorption fine structure (XAFS) analysis. From the measurement results, the presence of lead sulfite (PbSO 4 ) was confirmed from the galena irradiated with microwave. Therefore, oxidation reaction occurred by irradiation with microwave, and galena changed to lead sulfite, so it was inhibited by flotation. On the other hand, oxidation was not confirmed in pyrite. It is suggested that it was oxidized by heat from the other high reactive minerals like chalcopyrite or galena.

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