• Title/Summary/Keyword: Mineral Resources

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Upgrading of Iron from Waste Copper Slag by A Physico-chemical Separation Process (Physico-chemical 분리 공정에 의한 폐동슬래그로부터 철의 품위향상)

  • Lee, Kwang-Seok;Jo, Seul-Ki;Shin, Doyun;Jeong, Soo-Bock;Lee, Jae-Chun;Kim, Byung-Su
    • Resources Recycling
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    • v.23 no.3
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    • pp.30-36
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    • 2014

  • A large amount of waste copper slag containing about 35 ~ 45% iron has been generated and discarded every year from pyrometallurgical processes for producing copper from copper concentrate. Thus, recovery of iron from the waste copper slag is of great interest for comprehensive use of mineral resource and reduction of environment problems. In this study, a physico-chemical separation process for upgrading iron from the waste copper slag discharged as an industrial waste has been developed. The process first crushes the waste copper slag below 1 mm (first crushing step), followed by carbon reduction at $1225^{\circ}C$ for 90 min (carbon reduction step). And then, resulting material is again crushed to $-104{\mu}m$ (second crushing step), followed by wet magnetic separation (wet magnetic separation step). Using the developed process, a magnetic product containing more than 66 wt.% iron was obtained from the magnetic separation under a magnetic field strength of 0.2 T for the waste copper slag treated by the reduction reaction. At the same conditions, the percentage recovery of iron was over 72%. The iron rich magnetic product obtained should be used as a iron resource for making pig iron.

  • https://doi.org/10.7844/kirr.2014.23.3.30 인용 PDF KSCI

Characteristics of Polymetallic Occurrence in Kau Loc Area within Northern Vietnam: Preliminary Study (베트남 북부 카우록 다중금속 산출지의 특성: 예비연구)

  • Heo, Chul-Ho;Chi, Se-Jung;Park, Sung-Won;Lee, Jae-Ho
    • Economic and Environmental Geology
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    • v.44 no.5
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    • pp.345-357
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    • 2011

  • It was carried out to the survey on the lead-zinc and tungsten occurrences in the Kau Loc mineralized belt within northern Vietnam. The lead-zinc occurrence bear the ore body parallel to the bedding of limestone formation. Assuming the surface grade and geological reserve, Pb+Zn deposit is estimated to the small to medium-sized ore deposit. On the other hand, considering the distribution of small-scale stock intruding the Devonian limestone, it is thought that the tungsten occurrence has the proper geological conditions anticipating the presence of skarn mineralization. However, there is no evidence to recognize economic feasibility in the present situation because of the absence of detailed geology and ore deposit survey on the tungsten occurrence.

  • https://doi.org/10.9719/EEG.2011.44.5.345 인용 PDF KSCI

Paleoseismological implications of liquefaction-induced structures caused by the 2017 Pohang Earthquake

  • Gihm, Yong Sik;Kim, Sung Won;Ko, Kyoungtae;Choi, Jin-Hyuck;Bae, Hankyung;Hong, Paul S.;Lee, Yuyoung;Lee, Hoil;Jin, Kwangmin;Choi, Sung-ja;Kim, Jin Cheul;Choi, Min Seok;Lee, Seung Ryeol
    • Geosciences Journal
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    • v.22 no.6
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    • pp.871-880
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    • 2018

  • During and shortly after the 2017 Pohang Earthquake ($M_w$ 5.4), sand blows were observed around the epicenter for the first time since the beginning of instrumental seismic recording in South Korea. We carried out field surveys plus satellite and drone imagery analyses, resulting in observation of approximately 600 sand blows on Quaternary sediment cover in this area. Most were observed within 3 km of the epicenter, with the farthest being 15 km away. In order to investigate the ground's susceptibility to liquefaction, we conducted a trench study of a 30 m-long sand blow in a rice field 1 km from the earthquake epicenter. The physical characteristics of the liquified sediments (grain size, impermeable barriers, saturation, and low overburden pressure) closely matched the optimum ground conditions for liquefaction. Additionally, we found a series of soft sediment deformation structures (SSDSs) within the trench walls, such as load structures and water-escaped structures. The latter were vertically connected to sand blows on the surface, reflecting seismogenic liquefaction involving subsurface deformation during sand blow formation. This genetic linkage suggests that SSDS research would be useful for identifying prehistoric damage-inducing earthquakes ($M_w$ > 5.0) in South Korea because SSDSs have a lower formation threshold and higher preservational potential than geomorphic markers formed by surface ruptures. Thus, future combined studies of Quaternary surface faults and SSDSs are required to provide reliable paleoseismological information in Korea.

  • https://doi.org/10.1007/s12303-018-0051-y 인용 KSCI