Behaviors of Cyanide Leaching of Gold in Tailings and Adsorption of Gold Ions on Activated Carbon

Jayhyun Park; Ilhwan Park; Jumi Oh; Kyoungkeun Yoo

doi:10.32390/ksmer.2018.55.5.414

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Research Paper

Behaviors of Cyanide Leaching of Gold in Tailings and Adsorption of Gold Ions on Activated Carbon 광미 중 금 성분의 시안 침출과 활성탄 흡착 거동

31 October 2018. pp. 414-420

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Abstract

The treatment cost for removing heavy metals from tailings and contaminated soils has been determined to be more expensive than for solidification and stabilization processes. The objective of this study is to enhance the economic feasibility of the removal process by investigating the cyanide leaching, adsorption, and desorption of gold using activated carbon particles. Our study found that the leaching efficiency of gold decreased by increasing the particle size and pulp density and by decreasing cyanide concentration to 0.1%. The trace gold particle could be exposed to cyanide solution when it was fine-ground and cyanide was lost with decreasing pH when the gold had a high pulp density and low cyanide concentration. The adsorption behavior of gold on the activated carbon particle was investigated using Freundlich and Langmuir adsorption isotherm equations. The adsorption results showed good agreement with the Freundlich adsorption isotherm, and the desorption efficiency of gold increased with pH and temper ure.

Keywords

gold recovery

cyanide leaching

adsorption behavior

tailings

광미 및 오염토양으로부터 중금속을 제거공정은 고형화 및 안정화법에 비하여 처리비용이 높은 것으로 알려져 있다. 이 연구에서는 금의 회수를 위한 시안침출, 활성탄 흡착과 탈착 중 금의 기초거동을 조사하여 제거공정의 경제성 향상을 도모하고자 하였다. 금의 침출율은 입자크기가 클수록 시안농도가 0.1 % 정도로 낮을수록 광액농도가 증가할수록 감소하였다. 금은 미량으로 존재하므로 시료가 미분쇄될수록 시안용액에 노출되는 금의 양이 증가하는 것이 원인으로 판단되었으며, 시안농도가 낮거나 광액농도가 증가하면 pH가 낮아지는데 낮은 pH에서 시안이 증발하여 소모되는 것이 낮은 침출율의 원인으로 판단되었다. 침출된 금의 활성탄에 대한 흡착거동은 Freundlich 흡착등온식과 Langmuir 흡착등온식을 이용하여 각각 분석하였으며, 흡착결과는 Freundlich 흡착등온식에 부합하였다. 마지막으로 활성탄에 흡착된 금의 탈착거동은 pH와 온도가 증가할수록 탈착율이 증가하는 것이 관찰되었다.

키워드

금회수

시안침출

흡착거동

광미

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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 : 55
No :5
Pages :414-420
Received Date : 2018-10-10
Revised Date : 2018-10-26
Accepted Date : 2018-10-26
DOI :https://doi.org/10.32390/ksmer.2018.55.5.414

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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