• Resources Recycling
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• v.33 no.3
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• pp.48-56
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• 2024

In this study, physical property evaluation and physical separation of the target product were performed to investigate the possibility of using sewage sludge gasification solid residue (GSRs) as a circulating resource. Firstly, the GSRs used in this study was supplied by Sudokwon Landfill Management Corporation, and generally the GSRs was in the form of porous pellets with a particle size of several millimetres. In addition, the partially black areas were confirmed to be unburned and ungasified carbon, and the average carbon content was 5%. In addition, the content of silica, alumina and phosphorus oxide was more than 70% of the total content. It was confirmed that the metallic components of the wet grinding product were separated into individual elements. As a physical separation of metallic and non-metallic components was required, it was finally found that flotation screening was suitable. Accordingly, cationic and anionic surfactants were selected to separate metallic components in which a relatively large amount of non-metallic components were concentrated, and the separation characteristics were confirmed. As a result, it is expected that the concentration of non-metallic components such as silica, alumina and phosphorus will be easier than the separation of metallic components. Therefore, since it is possible to physically treat the gasified sludge residue, it is judged to have potential as a circular resource according to the proposed recycling method for the separated product.

• Proceedings of the Mineralogical Society of Korea Conference
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• 2002.10a
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• pp.69-92
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• 2002

비금속 및 금속 광물자원의 탐사는 국가경영에 있어서 절대적으로 필요한 공공의 기반산업에 해당된다. 지금까지 수행되어 왔던 자원 탐사사업의 대부분은 비교적 개발이 용이한 천부 광상들에 집중되어 왔으며, 천부 광상들의 과도한 개발로 인하여 자원탐사의 범위가 점차 심부화 되고있는 실정이다. 지하 심부에 분포하는 광상들을 효율적으로 탐사해 내기 위해서는 분지 내 심부 퇴적층들에 대한 정밀한 대비와 평가가 요구된다. 그러나, 그 동안 천부 광상들의 평가에 적용되어 왔던 기재적 층서 원리들로는 심부에 분포하는 광상들을 도출해 내는데 한계가 있어 왔다. 따라서, 분지 내 퇴적층들에 대한 보다 명확한 이해를 위해 새로운 고해상도의 층서틀 수립이 시급하다. 본 연구에서는 태백산분지 오오도비스 중기 퇴적층들에 대한 통합 층서적 접근을 통하여 고해상도 층서틀 수립에 대한 예를 제시하고자 한다. 이러한 통합 층서적 접근은 퇴적 분지의 지체 구조적 진화에 따른 층서를 규명하는데 있어서 보다 나은 통찰을 제공하고 있으며, 아울러 분지 내 비금속 및 금속 광물자원 탐사 및 개발사업의 효율성을 증대시키는데 사용될 수 있을 것이다 따라서, 통합 층서적 접근을 통한 퇴적층들에 대한 고해상도 층서틀 수립은 분지 내에 부존 되어 있는 모든 형태의 자원 탐사 및 개발사업에 있어서 성공률을 극대화시킬 수 있는 새로운 층서적 규범으로 강조되어 져야 한다.

• Bulletin of Korea Environmental Preservation Association
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• s.399
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• pp.12-15
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• 2012

국내에서 발생되는 도시광산 즉 폐금속 자원으로부터 유가금속을 회수하는 방안에 대한 관심이 최근 급증하고 있어 현실적인 대안으로 주목받고 있다. 국내에서 폐기된 폐전기 전자제품의 통계자료로부터 국내에 축적된 각종 폐전기 전자제품의 규모를 산정하면 약 3.3억대에 9.6조원 규모의 유가금속이 존재하는 것으로 분석되었으며 이에 대한 효율적인 재활용 기술이 활성화 된다면 소재원료의 자급도를 개선하고 안정적으로 확보할 수 있는 기반을 마련할 수 있을 것으로 기대된다.

• Resources Recycling
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• v.22 no.5
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• pp.3-12
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• 2013

It is necessary to manage risk of metals which are has rigid supply structures and expected demand expansion, considering to industry structure and resource securing capacity of each country. Countries conducted various criticality analyses and selected mainly rare metals as critical materials(or Critical metals or Critical raw materials). This study examined cases of metals risk evaluation and management which are based on technology changes and imbalance supply-demand. EU and U.S.A evaluated risk on metals needed as supply expansion of renewable energy. Japan forecasted demand of rare metals needed in Japan's growth engine industry. U.K analyzed criticality of metals, considering environmental burden occurred from mining to refining. Critical materials has features such as weak price signal, inelastic supply structure, demand volatility in technology change.

• Resources Recycling
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• v.23 no.5
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• pp.62-67
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• 2014

Used metallic can should be recycled from the point of view of environmental preservation and resource recycling. Metallic can is one of EPR items, and classified into steel can and aluminum can according to the can body material. In Korea about eighty percent of metallic cans are made of steel. In this article, production of cans and current status on domestic recycling of used metallic cans in recent years(2008-2012) were surveyed. Recycled ratio by weight of used steel and aluminum cans was about 80.8% and 81.8%, respectively in 2012. Totally it reached 81.8%.

• Hwankyungkyoyuk
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• v.6 no.1
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• pp.128-132
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• 1994

• Economic and Environmental Geology
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• v.41 no.5
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• pp.509-516
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• 2008

For analyzing resources demand appropriately, corresponding demand data is essential. But it is hard to get the suitable data of each resource demand, because every resources has various type as refined and many kind of alloyed. That reason makes many analyses to employ the data of refined metals as the representative quantity. But those refined metals are factors for producing final goods so those in domestic market are not always meant for producing domestic end goods. Thus in this paper, the domestic demands of refined copper, lead and zinc are analyzed empirically with 'intensity of use' and foreign countries' income variable applied model for recovering the data availability.

• Resources Recycling
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• v.23 no.3
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• pp.51-60
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• 2014

In this study, the domestic supply & demand of the raw materials of 35 rare metals was analyzed categorized as four types - ores, metals, compounds and scraps. Foreign trade volumes of the raw materials of rare metals have been steadily increased, furthermore, recently trade growth rate highly exceeds GDP. The raw materials of rare metals - silicon, nickel, molybdenum, manganese, etc. - for steel industry were the most big part of the raw materials of rare metals trade, while the raw materials of rare metals for electronics industry were imported relatively small volumes less than $100 million. However systematic supply & demand management on the raw materials of rare metals for electronics industry is needed since recently growth rate per year has been remarkably high over 20%. Import volumes were about three times bigger than export scale, and most of the raw materials of rare metals were traded as a metal form.

• Resources Recycling
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• v.24 no.5
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• pp.72-79
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• 2015

Since there are many kinds of non-ferrous metal, it is difficult to investigate the current status on the recycling of all the non-ferrous metals. Therefore, the survey is confined to some commercially important non-ferrous metals such as copper, aluminum, zinc, lead, nickel and magnesium in this article. Domestic demand and production of these non-ferrous metals in recent years (2010-2014) and recycling ratio of the scraps are estimated briefly here.

• Resources Recycling
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• v.18 no.1
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• pp.52-57
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• 2009

Since there are many kinds of non-ferrous metal, it is difficult to investigate the current status on the recycling of non-ferrous metals. Therefore, the survey is confined to some commercially important non-ferrous metals such as copper, lead, zinc, aluminum, nickel and magnesium in this article. Domestic demand and production in recent years and current status on the recycling of the scraps of these non-ferrous metals are introduced briefly here.