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The Dissolution Efficiency of Gold Concentrate with Microwave-nitric Acid Leaching and the Recovery of Invisible Gold Using the Filter Paper
마이크로웨이브-질산용출에 의한 금 정광의 용해효율과 여과지를 이용한 비-가시성 금 회수
Econ. Environ. Geol. 2019 Dec;52(6):595-604
Published online December 31, 2019;  https://doi.org/10.9719/EEG.2019.52.6.595
Copyright © 2019 the Korean society of economic and environmental gelology.

Jong-Ju Lee and Cheon-Young Park*
이종주 · 박천영*

Dept. of Energy and Resource Engineering, Chosun University, Gwangju, Korea
조선대학교 에너지·자원공학과
Received August 27, 2019; Revised October 14, 2019; Accepted November 6, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
The purpose of this study was simply to obtain gold through a microwave-nitric acid experiment of invisible gold concentrate with the use of filter paper. For the purpose, this study conducted a microwave-nitric acid leaching experiment and examined nitric acid concentration. As a result of the experiment, this study discovered that Fe, Te and Ag were completely leached in the leaching solution whereas Au was not determined in all of the nitric acid conditions. The leaching solution was filtered with three filter papers and then these filter papers were analyzed with SEM/EDS. As a result of the EDS analysis, Au was detected in all of the surface and cross-section of the 1st, 2nd and 3rd filter papers. As the three filter papers containing solid-residue were analysed in the lead-fire assay, gold particles were found in all of the nitric acid conditions. In the lead-fire assay, maximum gold(452.50g/t) was recovered when nitric acid concentration was 6M and microwave leaching time was 12mins.
Keywords : invisible gold, microwave-nitric acid leaching, filter paper, filtration, gold particle

 

December 2019, 52 (6)