• 한국초전도ㆍ저온공학회논문지
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• 제22권2호
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• pp.17-20
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• 2020

Comprehensive utilization of tungsten tailings resources not only solves environmental problems but also creates huge economic benefits. The high content of iron impurity in tungsten tailings will have adverse effect on the downstream comprehensive utilization, whether flotation or pickling. In this paper, the Superconducting High Gradient Magnetic Separation(S-HGMS) is used to remove of Fe impurities from tungsten tailings. The optimal experimental parameters are as follows: background magnetic induction intensity is 3.0T, slurry flow velocity is 500ml/min. The Fe removal rate of Fe was 68.8% and the recovery rate was 59.53%.

• 콘크리트학회논문집
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• 제16권3호
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• pp.383-390
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• 2004

본 연구에서는 상동지역 중석광 광미를 콘크리트용 혼화재료로 사용 가능한지 여부를 알아보기 위한 연구의 일환으로 광미의 품질특성과 혼화재료로 사용한 모르타르의 기초적 특성에 대하여 검토하였다. 상동지역 중석광 광미의 품질 특성을 파악하기 위해 XRD 및 PSA를 사용하여 광물학적인 특성을 검토하였다. XRD분석 결과 상동지역 중석광 광미내에는 석영(quartz), 녹니석(chlorite), 회장석(anorthite) 및 코디에라이트(cordierite) 등이 함유되어 있는 것으로 파악되었다. 또한, 상동지역 중석광 광미의 중금속 용출 특성을 파악하기 위해 광미를 혼합한 모르타르를 제작하여 KSLT의 규정에 의해 실험한 결과 규준범위를 만족하였다. 한편, 상동지역 중석광 광미를 혼합한 시멘트 모르타르의 응결시간과 압축강도 특성을 검토한 결과 광미의 혼합률이 증가할수록 응결시간은 지연되었고, 모르타르 압축강도는 감소하는 경향을 나타내었다.

• The Korean Journal of Ecology
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• 제23권6호
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• pp.445-452
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• 2000

The effects of sludge and fertilizer application on germination and seedling growth of woody plants on heavy metal mine tailings were evaluated by greenhouse experiment. Two different mine tailings (Lead-zinc mine tailings from Kwangmyong, Kyonggi-do and tungsten mine tailings from Sangdong. Kangwon-do). four fertilizer treatments (N +P +K: 20, 40, 60, and 80 kg/m$^3$), and four sewage sludge treatments (5.5, 11, 22.5, and 45 Mg/m$^3$) were used in the experiment. Tested plants were Pinus densiflora, Larix leptolepis, Amorpha fruticosa, and Alnus hirsuta. There were three replicates for each treatment. In addition, vermiculite was used instead of mine tailings to determine the effect of physical amendments. Fifty seeds of a species were sown in a pot (upper diameter 13.5 cm, depth 10 cm) and seedling emergence were recorded daily for 30 days. The highest germination rate was 53% for all treatments. Germination rate of Larix leptolepis was lowest among the four species studied. One month later after seeding, seedlings were thinned and only 5 seedling were left in each pot, and fertilizer and sewage sludge were applied once again. Growth of seedlings were determined for 10 weeks since then. Most plants grew very poorly or died within 5 weeks on lead/zinc mine tailings from Kwangmyong. The analysis of heavy metal contents by the total dissolution method showed that heavy metals generally increased in the order of tungsten mine tailings from Sangdong < sewage sludge from Puchon < lead/zinc mine tailings from Kwangmyong. Growth of woody plants was improved significantly by the fertilizer treatments on tungsten mine tailings. In contrast. survival and growth of woody plants were not affected significantly by the sewage sludge treatment on both tailings. This study shows that fertilizer applied to established seeded stands may provide some benefits in terms of increased ground cover in the field. It is suggested that reclamation should be proceeded by the study of the physico-chemical and biological characteristics of mine tailings.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.781-786
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• 2003

This study has focused on the possibility for recycling tailings from the Sangdong tungsten mine as admixture for concrete. The XRD(X-ray diffraction analysis) and PSA(Particle size analysis) were performed to find mineralogical characteristics. As a result of XRD analysis, the tailings were composed of quartz, feldspars and muscovites, and C-S-H and quartz were found in cement mortar. As a result of KSLT for cement mortar mixed with tailings, most of heavy metals were determined as below the guide line for waste material. In addition, the setting time and compressive strength of cement mortar mixed with tailings were investigated. It was indicated that the initial and final set were retarded according to increasing replacement. The compressive strength of mortar was decreased with increasing replacement.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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• pp.89-92
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• 2006

This study has focused on the possibility for recycling of tailings from the Sangdong tungsten mine as powder of superfluidity self-compacting concrete. The experimental tests for slump-flow, time required to reach 500mm of slump flow(sec), time required to flow through V-funnel(sec) and filling height of U-box test(mm) were carried out in accordance with the specified by the Japanese Society of Civil Engineering(JSCE). The result of this study, in case of superfluidity self-compacting concrete mixed with tailings, slump-flow was decreased with increasing mixing ratio. But time required to reach 500mm of slump flow(sec), time required to flow through V-funnel(sec) and filling height of U-box test(mm) were satisfied a prescribed range.

• 한국건설순환자원학회논문집
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• 제1권3호
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• pp.204-210
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• 2013

상동지역 중석광 광미의 품질 특성을 파악하기 위해 XRD 및 PSA를 사용하여 광물학적인 특성을 검토하였다. XRD분석 결과 상동지역 중석광 광미내에는 석영(quartz), 녹니석(chlorite), 회장석(anorthite) 그리고 코디에라이트(cordierite) 등이 함유되어 있는 것으로 파악되었다. 또한, 상동지역 중석광 광미의 용출 특성을 파악하기 위해 광미를 혼합한 모르터를 제작하여 KSLT의 규정에 의해 실험한 결과 폐기물 관리법 시행규칙에 제시된 유해물질 함유 기준값 보다 낮은 결과를 나타내었으며, 특히, 고루슬래그 미분말의 혼합률이 증가할수록 중금속의 농도는 감소함을 알 수 있다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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• pp.616-619
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• 2004

This study has focused on the possibility for recycling of tailings from the Sangdong tungsten mine as powder. The experimental tests for entrapped water ratio were carried out in accordance with the specificed method by Okamura. The rheological measurements of cement paste were conducted by using a commerically digital Brookfield viscometer (Model LVDV-II+) equipped with cylindrical spindles. The results of this study, in case of cement paste mixed with tailings, entrapped water ratio was decreased with increasement of mixing ratio. Thickness of pseudo water film was increased, and mean plastic viscosity was decreased with increasing replacement.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.437-440
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• 2003

This study has focused on the possibility for recycling of tailings from the Sangdong tungsten mine as powder of self-compacting concrete(SCC). The experimental tests for slump-flow, reaching time to the slump-flow of 500mm, V-funnel and U-box were carried out in accordance with the specified by the Japanese Society of Civil Engineering(JSCE). The result of this study, in case of SCC mixed with tailings, slump-flow was decreased with increasing mixing ratio. But reaching time slump-flow of 500mm, V-funnel and U-box were satisfied a prescribed range. The mechanical properties including compressive strength, splitting tensile strength and static modulus of elasticity were checked with the requirements specified by Korean Industrial Standard(KS). The compressive strength of SCC was decreased with increasing replacement, splitting tensile strength and static modulus were similar to those of normal concrete.

• 대한토목학회논문집
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• 제26권4A호
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• pp.767-774
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• 2006

본 연구에서는 상동지역 중석광 광미를 콘크리트용 혼화재료로 사용하기 위한 연구의 일환으로 자기충전콘크리트의 분체로서 적용가능성을 검토하였다. 상동지역 중석광 광미를 혼합한 시멘트 페이스트의 유변학적 특성을 검토하기 위하여 구속수비 및 점도계를 이용하여 평균소성점도 및 항복응력을 측정하였으며 가상수막이론을 적용하여 검토하였다. 그리고 광미를 혼합한 자기충전콘크리트의 자기충전성 평가는 일본 토목학회에서 제시한 기준안을 적용하여 검토하였으며, 역학적 특성은 압축강도, 쪼갬인장강도 및 탄성계수를 측정하여 검토하였다. 실험결과 광미의 혼합률이 증가함에 따라 구속수비와 평균소성점도는 감소하였으며, 가상수막 두께는 증가하는 경향을 나타냈다. 또한, 광미를 혼합한 자기충전콘크리트의 자기충전성 검토 결과는 유동성 평가기준인 슬럼프 플로우 500 mm 도달시간의 경우 광미의 혼합률이 증가함에 따라 다소 증가하였고 재료 분리저항성 및 충전성 평가 결과는 기준을 만족하는 경향을 나타내고 있었다. 역학적 특성 검토 결과는 압축강도의 경우 광미의 혼합률이 증가함에 따라 압축강도는 감소하였고, 쪼갬인장강도 및 탄성계수는 보통 콘크리트의 유사한 경향을 나타내었다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.325-330
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• 2001

Shizhuyuan W-Mo-Bi-Ca $F_2$polymetallic ore is classified to the refractory one due to its complex property, fine dissemination and close association of minerals. Through several years of researches, in line with GY new mineral processing technology developed by Guangzhou Research Institute of Nonferrous Metals, in sulfide flotation circuit, an iso-flotability flowsheet is used to replace original overall bulk flotation flowsheet, and in tungsten flotation circuit, a new chelating type-GY reagent and a special pulp-conditioning system and a new technology of wolframite slime flotation are used to replace the traditional "Caustic Soda Method"$_{［1］}$, the metallurgical performance is greatly improved. Besides, GY New Method has created a favorable condition for comprehensive recovery of fluoride from tungsten flotation tailings. Notable economic benefit has been achieved.d.