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티오요소를 이용한 금 정광으로부터 금-은 추출에 관한 연구

A Study on Extraction of Gold-silver from Refractory Gold Concentrate by Using Thiourea Solution

조강희|박천영|김봉주|최낙철
한국자원공학회 (The Korean Society of Mineral and Energy Resources Engineers)|2013.10|한국자원공학회지 (Journal of the Korean Society of Mineral and Energy Resources Engineers)|제50권 제5호|pp. 641-650|DOI http://dx.doi.org/10.12972/ksmer.2013.50.5.641

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참고문헌

키워드

Ferric sulfate황산나트륨Thiourea티오요소Sodium sulfite황산제2철저항성 금 정광금-은 추출율Refractory gold concentrateGold-silver extraction rate
주제분류자원공학

초록

티오요소를 정광에 적용하여 Au와 Ag를 효과적으로 추출하고자하였다. 티오요소 용출실험 전에 정광을 황산으로 세척하고 그리고 650℃에서 소성시켰다. 이들 정광을 농도별 티오요소로, 온도별로 그리고 pH별로 용출실험을 수행하였다. Au와 Ag의 추출율은 다른 전처리보다 소성정광에서 더 많이 일어났다. 소성정광에서 티오요소 0.8 g과 온도 50℃를 적용하였을 때 Au 최대 추출율 70.83%를 그리고 Ag 최대 추출율 98.12%를 각각 얻었다. Au와 Ag의 용출율은 pH가 감소할수록 증가하였고 용출온도가 증가할수록 증가하였다. 티오요소는 언제나 Au보다 Ag가 더 많이 추출되었다.

Abstract

This study was extracted effectively to gold and silver from concentrate using thiourea. Before thiourea leaching experiments, the concentrate was treated prewashing by sulfuric acid and roasting at 650℃. The concentrates were conducted at leaching experiment by concentration of thiourea, temperature, and pH. The results showed higher extraction by processing using roasting than other preprocessing. The maximum extraction of gold and silver was found to be 70.83% for gold and 98.12% for silver in the roasted concentrate with the addition of 0.8g of thiourea at 50℃. The leaching rate of gold and silver increased in the thiourea leaching solution with decreased pH and increased temperature. The extraction of Ag was always much greater than Au in the concentrates with the thiourea leaching solution.

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