금광산 광미로부터 유가금속회수에 관한 연구

Abstract

In Korea, the gold demand for industrial use is expected to increase. As of 2009 our country’s total gold reserve is 5,691.8 thousand tons including both estimated and proven reserves. Domestic gold mining started in the middle of 1980 and was extracting its underground resources. Due to the worsened environment, rising labor costs and inexpensive foreign minerals imports, domestic gold mining has been slowing down and has gradually stopped. Small scale Moisan mine is running in Hae-nam area. Daewoo Shipbuilding ＆ Marine Engineering(DSME) S.M.C is currently producing 300 kg of Gold and 2,500 kg of Silver annually. The factory is processing 160 tons of ores per day and extracting 150 ton of processing tailings. This company is planning to increase its operating capacity to 280 ton ores per day and the tailings quantity is expected to increase simultaneously. At present, part of tailings is dried using mine filter, but most of waste products are collected in tailings dam and a suitable, DSME S.M.C tailings analysis data shows that tailings contains 1.5∼2.0 ppm gold and 10∼15 ppm silver. Therefore, this study was conducted using flotation method in order to develop technology for Au recovery in tailing. Batch flotation experiments were confirmed in this study, that by obtaining 21.31 ppm(Au grade) and 62.73% (Au recovery) in the condition of K.A.X (97.2 g/ton), frother AF 65 (0.248ℓ/ton) and depressant sodium silicate (4 kg/ton), it's possible to recover one of the most valuable metal Au, by re-feeding to rougher flotation. Also, Micro-bubble column flotation experiments were in this study, that by obtaining 14.17 ppm(Au grade) product with 87.75% recovery through optimal condition of K.A.X as collector (0.2ℓ/ton), DF as Frother 250 (0.2 ㎖/ton), sodium silicate as depressant (2 kg/ton), wash water 630 ml/min and air flow rate of 960 ml/min.