국내 금 광산 폐광미로부터 비금속광물을 분리, 선별하는 공정 중에서 황비철광, 방연광 등이 혼합된 금속광물이 부산물로 회수되며, 이 부산물에는 Au, Pb, As, Fe 성분들이 매우 높게 농축되어진다. 이 부산물로부터 Au의 효율적 회수를 위해서는 우선 금 제련공정에 해로운 거동을 나타내는 금속성분들을 분리, 제거할 필요가 있다. 본 연구에서는 금 광산 폐광미로부터 회수된 금속광물 부산물로부터 Pb, As, Fe등을 제거, 분리하는 실험을 수행하였다. Pb는 알칼리 가압산화침출에 의하여 $120^{circ}C$, 2M NaOH, 100psi $Po_2$, 250r.p.m., 4 wt.% 고체, 30 min. 침출조건에서 3% 이하 까지 제거시킬 수 있었으며, 침출잔사를 배소 및 자력선별처리하여 As 0.2% 이하, Fe 3% 이하 및 8,000 ppm 이상의 Au 함량을 갖는 비자성산물을 얻을 수 있었다.
Domestic gold mine tailings, generally, contain a lot of non-metallic silica and clay minerals. These minerals can be separated from the tailings by various physical separation methods and used as raw materials for cements and ceramic products. In these physical separation procedures, metallic complex sulfides, in which Au and metallic constituents such as Pb, As and Fe were concentrated, were obtained as a by-product. These metallic constituents should be removed or separated from the by-product to extract Au efficiently. In this work, removal and separation processes of Pb, As, and Fe from the by-product were investigated. Pb was removed to under 3% by using alkaline oxidative leaching at the leaching condition of $120^{circ}C$, 2M NaOH, 100psi $Po_2$, 250r.p.m., 4 wt.% solid and 30 min. leaching time. The leached residue was roasted and separated magnetically to obtain a non-magnetic product contained <0.2% As, <3% Fe and high concentrated Au more than 8,000 ppm.
