[논문]다양한 자원으로부터 은의 화학적 침출

행위동; 이만승

doi:10.7844/kirr.2017.26.1.3

다양한 자원으로부터 은의 화학적 침출
Chemical Leaching of Silver from Diverse Resources 원문보기

資源리싸이클링 = Journal of the Korean Institute of Resources Recycling, v.26 no.1, 2017년, pp.3 - 10

행위동 (목포대학교 공과대학 신소재공학과) , 이만승 (목포대학교 공과대학 신소재공학과)

초록
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은은 특수한 물성을 지니고 있으며 첨단소재용 원료로 사용된다. 따라서 첨단소재를 제조하는데 필요한 고순도 은을 다양한 자원으로부터 회수하는 공정을 개발하는 것은 매우 중요하다. 본 논문에서는 여러 자원으로부터 은의 침출을 위해 개발된 공정을 조사하였다. 무기산(질산과 황산)과 무기산 및 산화제(오존, 산소, 과산화수소, 3가 철이온)의 혼합용액에 의한 은의 침출공정의 장단점을 비교하였다. 또한 thiourea와 thiosulfate에 의한 은의 침출과 무기산에 의한 침출에 대해 환경에 미치는 영향을 중심으로 비교하였다.

Abstract ▼ AI-Helper

The special properties of silver are often indispensable in the manufacture of advanced materials. Therefore, it is of importance to develop a process to recover silver which is necessary for the production of advanced materials from diverse resources. In this manuscript, the developed processes for the leaching of silver from diverse resources are reviewed. For this purpose, the advantages and disadvantages of using some inorganic acids (nitric and sulfuric acid) and their mixture with other oxidizing agents (ozone, oxygen, hydrogen peroxide and ferric ion) were investigated. Moreover, the leaching of silver with thiourea and thiosulfate was compared over those by inorganic acids in terms of environmental effect.

주제어

AI 본문요약
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성능/효과

²⁴⁾ reported the effect of NaOH pretreatment on the leaching of silver and gold from a refractory antimonial ore. According to this work, the leaching percentage of silver and gold improved from 18.7 to 90% and 49.3 to 85.4% under the conditions: 3 M NaOH, 80℃.
²³⁾studied the extraction of silver and gold from a refractory ore with cyanidation followed by the KOH pretreatment. It was observed that under the KOH pretreatment the leaching percentage of silver and gold increased from 18.7 to 94.5% and 49.3 to 87.6%, respectively, at the conditions of 5 M KOH, 80℃, 2 h; cyanidation 1.5 g/L NaCN, pH 10.5, 24 h. The pretreatment could lessen the influence of other metals such as Sb on the leaching of Ag and Au.

후속연구

6% Fe³⁺, after leaching reaction 2 h, the leaching percentage of Au and Ag was 90% and 50%, respectively. Since the leaching percentage of Ag is not high, it is necessary to do further research to improve the leaching percentage of silver.
as well as some elements such as copper in the secondary resources could result in the higher consumption of these reagents. Therefore, further research should be performed to overcome these problems for the industrial application in future. In addition, the ionic liquid is an efficient solvent to leach gold and silver from the mining with some leaching reagents, such as thiourea, chloride etc.

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