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2019 Vol.56, Issue 3

Research Paper

Removal of Penalty Elements from Invisible Gold Concentrate Using Microwave-nitric Acid Leaching and Its Gold Recovery by Lead Fire Assay

마이크로웨이브 질산용출을 이용한 비가시성 금 정광으로부터 페널티원소 제거와 납 시금법에 의한 금 회수

Hyun Soo Kim1
,
Eun Ji Myung1
,
Cheon-Young Park1*
김 현수1
,
명 은지1
,
박 천영1*
1조선대학교 에너지자원공학과
* Corresponding Author
30 June 2019. pp. 217-226
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Abstract

A microwave-nitric acid leaching test was performed to concentrate gold from invisible gold concentrate. Weight of the leach residue, removal ratio of As and Bi, and gold content were compared before and after the leaching tests. The weight decreased, while the removal ratio of As and Bi and gold content increased, with increasing nitric acid concentration and leaching time and decreasing solid-liquid ratio. Optimum conditions were confirmed as follows: microwave power = 3 kW, nitric acid concentration = 5 M, leaching time = 20 min, and solid-liquid ratio = 5%. Under the optimum conditions, the gold content increased from 88.30 g/t to 732.30 g/t, the weight loss ratio was 88.82%, and As and Bi were completely removed.

Keywords
invisible gold
microwave-nitric acid leaching
weight loss rate
removal rate of As and Bi
solid residue

비 가시성 금을 함유하는 정광으로부터 금을 농축시키기 위하여 마이크로웨이브 질산용출실험을 수행하였다. 마이크로웨이브 질산용출실험 종료 후 고체 잔류물의 무게 감소율, 비소와 비스무스 제거율 그리고 금 함량을 확인하였다. 질산농도와 용출시간이 증가하고 시료 첨가량이 감소함에 따라 무게 감소율, 비소와 비스무스 제거율 그리고 금 함량이 증가하였다. 최적조건은 3 kW의 마이크로웨이브에서 질산농도 5 M, 용출시간 20분, 시료 첨가량 5%로 확인되었다. 이때, 금 함량은 88.30 g/t에서 732.30 g/t으로 증가하였으며, 무게 감소율은 88.82% 그리고 비소와 비스무스는 모두 제거되었다.

키워드
비가시성 금
마이크로웨이브 질산용출
무게감소율
비소 및 비스무스 제거율
고체잔류물
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 56
  • No :3
  • Pages :217-226
  • Received Date : 2019-05-03
  • Revised Date : 2019-06-19
  • Accepted Date : 2019-06-21
  • DOI :https://doi.org/10.32390/ksmer.2019.56.3.217
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