• Title/Summary/Keyword: Mineral stone

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A Study on the Present Condition and Characteristic of Appeared Contaminants on the Surface of Stone Cultural Properties-Focus on the Contaminants of Ten storied pagoda of Gyeongcheonsa (석조문화재 표면에 발생된 오염물 현황 및 특성에 관한 연구-경천사십층석탑에 발생된 오염물을 중심으로)

  • Kim, Jin-Hyung;Lee, Ju-Wan;Han, Kyoung-Soon;Do, Jin-Young
    • 보존과학연구
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    • s.24
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    • pp.29-60
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    • 2003
  • The conservation problem of stone cultural properties is widely influenced by environmental pollution nowadays as well as agingsymptoms itself. Most stone cultural properties are directly affected by air pollution such as smoke, acid-rain, etc., resulting surface separation and pulverization. In the case of Ten storied pagoda of Gyeongcheonsa, once located in the center of the Seoul, the surface shows excessive contaminant by air pollution. It is very difficult to identify chemical structure and formation system of these contaminant. Also the discoloration and stains on the surface are not pleasant to see. Through the examination of the contaminant by SEM-EDS, it is observed that the major mineral is Gypsum and many other minerals were also revealed. The contaminant layer seems to be thin and wide at the south face of pagoda and thick and narrow at the north face. This distribution pattern could provide information on the surface characteristics of pagoda. Further, the information could help to identify the relationship between geological and environmental factors and the surface patterns.

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Necessity of Refining Domestic Limestone (국내(國內) 석회석(石灰石)의 품위(品位) 향상(向上) 필요성(必要性))

  • Kim, Hyung-Seok
    • Resources Recycling
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    • v.20 no.4
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    • pp.3-22
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    • 2011
  • Until recently, domestic high grade limestone have mainly mined so high grade limestone deposits have reduced. Because of exhaustion of high grade limestone, mine of limestone have moved from ground to deep position, the grade of limestone become lower because the amount of impurities and colored mineral increased as mining position become deeper. This paper was described about grade improvement of limestone to make a high grade limestone and suitable quality of limestone products by analysis of ore genesis and characteristics, supply and demand situation, use patterns and application standards of domestic lime-stone.

A Study on the Chemical Compositions of Powdered Sludge of Basalt on Jeju Island (건축용 내화 단열재 개발을 위한 제주도 현무암 석분 슬러지 화학조성에 대한 연구)

  • Kim, Min-Gyun;Kam, Sang-Kyu;Jeon, Yong-Han;Kim, Nam-Jin
    • Journal of the Korea Safety Management & Science
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    • v.21 no.4
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    • pp.45-49
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    • 2019
  • The basalt fiber is expected to become a trend for industrial fibers as they have better properties of heat-resistant, non-combustion, absorbent, soundproof, moistureproof, lightweight, corrosion resistant, and high strength properties. Also, the fiber is found to be non-toxic and harmless to the human body. Therefore, in this study, we analyzed the chemical and mineral compositions of powdered sludge of basalt produced at seven sites on Jeju Island for the development of fire resistance insulating material for a building. The results showed that the basalt stone sludge is made from only sodium calcium aluminum silicate and ferridioside components unlike the basalt rock.

Current Status and Necessity of Separation Technology to Secure Vanadium Mineral Resources (바나듐 광물자원 확보를 위한 선별 기술 현황 및 필요성)

  • Jeon, Hoseok;Han, Yosep;Baek, Sangho;Davaadorj, Tsogchuluun;Go, Byunghun;Jeong, Dohyun;Chu, Yeoni;Kim, Seongmin
    • Resources Recycling
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    • v.31 no.2
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    • pp.3-11
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    • 2022
  • Owing to the global development of high-strength alloys and renewable energy industries, the demand for vanadium, a key raw material in these industries, is expected to increase. Until now, vanadium has been recovered as a by-product of the industry, but interest in its direct recovery from minerals has increasing with its significantly increasing demand. In particular, the recovery of vanadium from stone coal ore and vanadium titano-magnetite (VTM) containing vanadium has been actively researched in China, which has the largest reserves and production of vanadium in the world. In Korea, a large amount of VTM also occurs in the northern part of Gyeonggi-do, and fundamental research and technical development is being conducted to recover vanadium. It is necessary to understand the current status of the separation technology used worldwide to satisfy the demand for metals such as vanadium, which currently depends on imports.

A Study on Induced effect of Aggregate and Stone Sector with Input-Output Table (산업연관표를 이용한 골재 및 석재부문의 경제적 파급효과 분석연구)

  • Kim, Ji Whan
    • Economic and Environmental Geology
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    • v.54 no.5
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    • pp.573-580
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    • 2021
  • This study analyzed the induced effects of the aggregate and stone sectors using the industry association table. First, the added value of the aggregate and stone sectors was summarized, and then the intermediate input structure and induced effect were analyzed. In terms of value-added structure, aggregate and stone showed a higher employee remuneration rate compared to the manufacturing industry, and a higher rate of operating surplus compared to other mining industries. The intermediate input structure summarizes the sector using aggregate and stone products as intermediate inputs and their input ratio. The proportion of the intermediate element input structure was confirmed. In addition, the main input sectors of ready-mixed concrete, the largest consumer of aggregate and stone, are also summarized. The production-inducing effect of aggregate and stone showed a higher influence coefficient than the sensitivity coefficient, confirming that they had a relatively large rear chain effect. The production inducement effect was reviewed by reconstructing the industry association table, and it was found to show a relative superiority in the influence coefficient, similar to the results derived according to the provisional classification of the Bank of Korea.

A Study on the Trend and Utilization of Stone Waste (석재폐기물 현황 및 활용 연구)

  • Chea, Kwang-Seok;Lee, Young Geun;Koo, Namin;Yang, Hee Moon
    • Korean Journal of Mineralogy and Petrology
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    • v.35 no.3
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    • pp.333-344
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    • 2022
  • The quarrying and utilization of natural building stones such as granite and marble are rapidly emerging in developing countries. A huge amount of wastes is being generated during the processing, cutting and sizing of these stones to make them useable. These wastes are disposed of in the open environment and the toxic nature of these wastes negatively affects the environment and human health. The growth trend in the world stone industry was confirmed in output for 2019, increasing more than one percent and reaching a new peak of some 155 million tons, excluding quarry discards. Per-capita stone use rose to 268 square meters per thousand persons (m2/1,000 inh), from 266 the previous year and 177 in 2001. However, we have to take into consideration that the world's gross quarrying production was about 316 million tons (100%) in 2019; about 53% of that amount, however, is regarded as quarrying waste. With regards to the stone processing stage, we have noticed that the world production has reached 91.15 million tons (29%), and consequently this means that 63.35 million tons of stone-processing scraps is produced. Therefore, we can say that, on a global level, if the quantity of material extracted in the quarry is 100%, the total percentage of waste is about 71%. This raises a substantial problem from the environmental, economical and social point of view. There are essentially three ways of dealing with inorganic waste, namely, reuse, recycling, or disposal in landfills. Reuse and recycling are the preferred waste management methods that consider environmental sustainability and the opportunity to generate important economic returns. Although there are many possible applications for stone waste, they can be summarized into three main general applications, namely, fillers for binders, ceramic formulations, and environmental applications. The use of residual sludge for substrate production seems to be highly promising: the substrate can be used for quarry rehabilitation and in the rehabilitation of industrial sites. This new product (artificial soil) could be included in the list of the materials to use in addition to topsoil for civil works, railway embankments roundabouts and stone sludge wastes could be used for the neutralization of acidic soil to increase the yield. Stone waste is also possible to find several examples of studies for the recovery of mineral residues, including the extraction of metallic elements, and mineral components, the production of construction raw materials, power generation, building materials, and gas and water treatment.

Analysis of Crushed stone by Petrographic Examination (쇄석골재의 광물학적 반응성분 분석)

  • 이장화;김성옥;이강원
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.04a
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    • pp.1-5
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    • 1993
  • In the country, due to short comings of natural aggregates of good quality, it is common to use crushed stones. However, the investigation has not been done on the chemical reaction of crushed stones. This study tested and analyzed the aggregate chemical reaction by petrographic examination(ASTM C 295) for the test aggregates which had been tested by chemical method(ASTM C 289) in the first year. As a result, most of test aggregates didn't show any reaction but many have common deleterious mineral. Therefore, there exists the possibility of chemical reaction in petrogrphic point of view

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A laboratory experiment on estimation of homogeneity of subsurface media by Polarimetric Ground Penetrating Radar

  • Kobayashi, Takao
    • 한국지구물리탐사학회:학술대회논문집
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    • 2006.06a
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    • pp.31-34
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    • 2006
  • Laboratory experiment of polarimetric GPR measurement was conducted for the purpose of estimating subsurface inhomogeneity. Tow realization of inhomogeneous subsurface media were made by burying stone objects of different dimensions in homogeneous dry sand. Polarization ratio of cross polarization to co polarization data were examined to find their obviously distinguishable behavior.

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Engineering Geological Properties of Some Domestic Marbles (국내산(國內産) 대리석(大理石)의 지질공학적(地質工學的) 특성(特性))

  • Cheong, Young Wook;Chon, Hyo Taek
    • Economic and Environmental Geology
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    • v.23 no.4
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    • pp.411-424
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    • 1990
  • Mechanical, physical and petrographic properties of seventeen marble specimens collected from ten marble mines in Korea were investigated. Studied marbles were mainly composed of calcite, dolomite, and various amounts of serpentine, tremolite, olivine, quartz and opaque minerals. Complete and sutured textures were dominant. Compressive strength measured normal to the bedding plane is larger almost two times than that measured parallel to the bedding plane. From the results of Shore hardness test on marbles, water content was an important factor to decrease Shore hardness values. Engineering geological properties, especially, compressive strength, Young's modulus, wear resistance and water absorption could be controlled by the presence of quartz, and the type of marble texture. Water absorption-porosity, compressive strength-Young's modulus, and impact strength index-Los Angeles abrasion couples show good correlation. According to the comparative utility as commercial stone, it could be concluded that marbles from the Banglim mine, Songbo mine, Kwangdeok mine and Bongjeong mine were superior to that of other studied marbles.

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A Brief Review on Limestone Sources and Oyster Waste Generation-Bantayan

  • Yu, Kwang Sun;Thriveni, Thenepalli;Jegal, Yujin;Whan, Ahn Ji
    • Journal of Energy Engineering
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    • v.26 no.1
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    • pp.62-67
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    • 2017
  • Limestone is an important commodity in Philippines. Limestone has numerous uses that range from agricultural applications to building materials to medicines. Many limestone products require rock with specific physical and chemical characteristics. Most limestone is biochemical in origin meaning the calcium carbonate in the stone originated from shelled oceanic creatures. In this paper, we reported the natural sources of limestone, geological formation of limestone and the oyster shell waste in Cebu, Bantayan, Philippines were reported. Due to the mining or quarrying in Cebu, Bantayan, in a limestone area poses the threat of groundwater pollution (since limestone is a porous geologic formation with a high transmissivity). The other environmental issue is oyster shell waste. The oyster shell waste is the major source of limestone. We developed and applied appropriate technologies for the extraction of limestone from oyster shell waste and utilizes as high value added material.