Effective gold recovery from near-surface oxide zone using reductive microwave roasting and magnetic separation

Bong Ju Kim, Kang Hee Cho, Sang Gil Lee, Cheon Young Park, Nag Choul Choi, Soon-Jae Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

High content of gold in near-surface oxide zones above the gold ore deposit could be recovered using cyanidation. However, restricting the use of cyanide in mines has made it difficult to recover gold within the oxide zone. In this study, we investigated an application of the reductive microwave roasting and magnetic separation (RMR-MS) process for the effective gold recovery from ores in a near-surface oxide zone. Ore samples obtained from the near-surface oxide zone in Moisan Gold Mine (Haenam, South Korea) were used in RMR-MS tests for the recovery of iron and gold. The effect of the RMR process on the recovery of iron and gold was evaluated by given various conditions of the microwave irradiation as well as the dosages of reductant and additive. The microwave roasting resulted in a chemical reduction of non-magnetic iron oxide minerals (hematite) to magnetite minerals, such as magnetite and maghemite. This mineral phase change could induce the effective separation of iron minerals from the gangue minerals by magnetic separation process. The increased iron recovery was directly proportional to the gold recovery due to the coexistence of gold with iron minerals. The RMR-MS process could be a promising method for gold recovery from the ores in near-surface oxide zones.

Original languageEnglish
Article number957
JournalMetals
Volume8
Issue number11
DOIs
Publication statusPublished - 2018 Jan 1

Fingerprint

Magnetic separation
Gold
Oxides
Microwaves
Recovery
Minerals
Iron
Ferrosoferric Oxide
Ores
Magnetite
Oxide minerals
Ore deposits
Gold mines
Microwave irradiation
Hematite
Reducing Agents
Cyanides
Iron oxides

Keywords

  • Fe-oxide
  • Gold recovery
  • Magnetic separation
  • Mineral phase change
  • Oxide zone
  • Reductive microwave roasting

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Effective gold recovery from near-surface oxide zone using reductive microwave roasting and magnetic separation. / Kim, Bong Ju; Cho, Kang Hee; Lee, Sang Gil; Park, Cheon Young; Choi, Nag Choul; Lee, Soon-Jae.

In: Metals, Vol. 8, No. 11, 957, 01.01.2018.

Research output: Contribution to journalArticle

Kim, Bong Ju ; Cho, Kang Hee ; Lee, Sang Gil ; Park, Cheon Young ; Choi, Nag Choul ; Lee, Soon-Jae. / Effective gold recovery from near-surface oxide zone using reductive microwave roasting and magnetic separation. In: Metals. 2018 ; Vol. 8, No. 11.
@article{8af7f99d286b446dbbf7732c59efecb7,
title = "Effective gold recovery from near-surface oxide zone using reductive microwave roasting and magnetic separation",
abstract = "High content of gold in near-surface oxide zones above the gold ore deposit could be recovered using cyanidation. However, restricting the use of cyanide in mines has made it difficult to recover gold within the oxide zone. In this study, we investigated an application of the reductive microwave roasting and magnetic separation (RMR-MS) process for the effective gold recovery from ores in a near-surface oxide zone. Ore samples obtained from the near-surface oxide zone in Moisan Gold Mine (Haenam, South Korea) were used in RMR-MS tests for the recovery of iron and gold. The effect of the RMR process on the recovery of iron and gold was evaluated by given various conditions of the microwave irradiation as well as the dosages of reductant and additive. The microwave roasting resulted in a chemical reduction of non-magnetic iron oxide minerals (hematite) to magnetite minerals, such as magnetite and maghemite. This mineral phase change could induce the effective separation of iron minerals from the gangue minerals by magnetic separation process. The increased iron recovery was directly proportional to the gold recovery due to the coexistence of gold with iron minerals. The RMR-MS process could be a promising method for gold recovery from the ores in near-surface oxide zones.",
keywords = "Fe-oxide, Gold recovery, Magnetic separation, Mineral phase change, Oxide zone, Reductive microwave roasting",
author = "Kim, {Bong Ju} and Cho, {Kang Hee} and Lee, {Sang Gil} and Park, {Cheon Young} and Choi, {Nag Choul} and Soon-Jae Lee",
year = "2018",
month = "1",
day = "1",
doi = "10.3390/met8110957",
language = "English",
volume = "8",
journal = "Metals",
issn = "2075-4701",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "11",

}

TY - JOUR

T1 - Effective gold recovery from near-surface oxide zone using reductive microwave roasting and magnetic separation

AU - Kim, Bong Ju

AU - Cho, Kang Hee

AU - Lee, Sang Gil

AU - Park, Cheon Young

AU - Choi, Nag Choul

AU - Lee, Soon-Jae

PY - 2018/1/1

Y1 - 2018/1/1

N2 - High content of gold in near-surface oxide zones above the gold ore deposit could be recovered using cyanidation. However, restricting the use of cyanide in mines has made it difficult to recover gold within the oxide zone. In this study, we investigated an application of the reductive microwave roasting and magnetic separation (RMR-MS) process for the effective gold recovery from ores in a near-surface oxide zone. Ore samples obtained from the near-surface oxide zone in Moisan Gold Mine (Haenam, South Korea) were used in RMR-MS tests for the recovery of iron and gold. The effect of the RMR process on the recovery of iron and gold was evaluated by given various conditions of the microwave irradiation as well as the dosages of reductant and additive. The microwave roasting resulted in a chemical reduction of non-magnetic iron oxide minerals (hematite) to magnetite minerals, such as magnetite and maghemite. This mineral phase change could induce the effective separation of iron minerals from the gangue minerals by magnetic separation process. The increased iron recovery was directly proportional to the gold recovery due to the coexistence of gold with iron minerals. The RMR-MS process could be a promising method for gold recovery from the ores in near-surface oxide zones.

AB - High content of gold in near-surface oxide zones above the gold ore deposit could be recovered using cyanidation. However, restricting the use of cyanide in mines has made it difficult to recover gold within the oxide zone. In this study, we investigated an application of the reductive microwave roasting and magnetic separation (RMR-MS) process for the effective gold recovery from ores in a near-surface oxide zone. Ore samples obtained from the near-surface oxide zone in Moisan Gold Mine (Haenam, South Korea) were used in RMR-MS tests for the recovery of iron and gold. The effect of the RMR process on the recovery of iron and gold was evaluated by given various conditions of the microwave irradiation as well as the dosages of reductant and additive. The microwave roasting resulted in a chemical reduction of non-magnetic iron oxide minerals (hematite) to magnetite minerals, such as magnetite and maghemite. This mineral phase change could induce the effective separation of iron minerals from the gangue minerals by magnetic separation process. The increased iron recovery was directly proportional to the gold recovery due to the coexistence of gold with iron minerals. The RMR-MS process could be a promising method for gold recovery from the ores in near-surface oxide zones.

KW - Fe-oxide

KW - Gold recovery

KW - Magnetic separation

KW - Mineral phase change

KW - Oxide zone

KW - Reductive microwave roasting

UR - http://www.scopus.com/inward/record.url?scp=85057328039&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85057328039&partnerID=8YFLogxK

U2 - 10.3390/met8110957

DO - 10.3390/met8110957

M3 - Article

AN - SCOPUS:85057328039

VL - 8

JO - Metals

JF - Metals

SN - 2075-4701

IS - 11

M1 - 957

ER -