• Resources Recycling
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• v.28 no.2
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• pp.23-30
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• 2019

An color sorting technique was introduced to recycle End-of-life automobile shredded bumpers. The color sorting is a innovate method of separating the differences in the color of materials which are difficult to separate in gravity and size classification by using a camera and an image process technique. Experiments were planned and optimal conditions were derived by applying BBD (Box-Behnken Design) in the reaction surface method. The effects of color sensitivity, feed rate and sample size were analyzed, and a second-order reaction model was obtained based on the analysis of regression and statistical methods and $R^2$ and p-value were 99.56% and < 0.001. Optimum recovery was 94.1% under the conditions of color sensitivity, feed rate and particle size of 32%, 200 kg/h, and 33 mm respectively. The recovery of actual experiment was 93.8%. The experimental data agreed well with the predicted value and confirmed that the model was appropriate.

• Resources Recycling
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• v.11 no.6
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• pp.3-11
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• 2002

Recently, waste printed circuit board (PCB) has significantly increased in its amount due to the rapid development of electronic industries. Since several kinds of noxious materials and also valuable metals are contained in it, the waste PCB is in an urgent need of recycling for the dual purposes for the prevention of environmental pollution and recovery of valuable resources. Also, the catalyst which equipped in the exhaust pipes of automobiles to reduce emission of air pollutants contains precious met-als so that their recovery from the waste auto-catalysts is required. In this study, the recovery of valuable metals from waste PCB and auto-catalyst by arc furnace melting process has been investigated, which is known to be very stable and suitable f3r less production of pollutants due to its high operating temperature. The effect of the kind of flux on the recovery of precious metals was examined by using quicklime, converter slag, and copper slag as the flux. In addition, the influence of direct and alternating current and the applying direction of direct current has been investigated. It was observed that using converter or copper slag as a flux was more desirable for a higher efficiency in the precious metal recovery compared with quicklime. For the effect of current, application of direct current taking the bottom as a negative pole generally showed a better efficiency for the extraction of valuable metals from waste PCB, which was also observed for the case of waste auto-catalyst. The average recovery of precious metals from both wastes by arc furnace melting process was very high, which was up to in the range of 95～97%.

• Resources Recycling
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• v.24 no.1
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• pp.51-57
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• 2015

The glass has been used continuously since ancient period up to the present day. The smart glass industry in which the advanced technology is added is developing. The life cycle of the smart glass is faster than traditional glass. Therefore, the basic and core technology development is needed for recycling of smart glass according to the replace period. Among the smart glass the recycling development of the automobile industry is the most needed areas. At the end of life of the automobile, the amount of the smart glass is expected to be over 23,000 tons per year. In this paper, the current status of domestic Korean automobile glass has been comprehensively investigated. Finally, Korean domestic smart glass recycling technology is also briefly introduced.

• Resources Recycling
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• v.15 no.5 s.73
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• pp.3-10
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• 2006

The solvent extraction for the separation of platinum group metals from the leach liquor of spent automotive catalysts has been studied. Tri-n-butyl phosphate (TBP), tri-n-octylamine (TOA) and di-n-hexyl sulfide (DHS) were used as extractants and kerosene as a diluent. The extraction behavior of platinum, palladium and rhodium has been investigated as functions of different kinds of extractants and their concentrations. In addition, the extraction behavior of the major metal impurities such as cerium, lead, iron, magnesium and aluminum has been investigated. Platinum and palladium were extracted with TBP. And platinum, palladium and rhodium were extracted with TOA. Platinum was co-extracted with palladium into the organic phase by solvent extraction using SFI-6 of DHS extractant, but only palladium was selectively extracted with SFI-6R. The selective extraction of palladium with SFI-6R was found better than that with SFI-6, but the kinetics of extraction with SFI-6R was found poor in comparison to SFI-6. The metal impurities extracted simultaneously during the extraction of platinum group metals should be removed in scrubbing and stripping processes. A suitable process has been proposed for the separation of platinum group metals from the leach liquor of spent automotive catalysts. Initially palladium was extracted with SFI-6R, followed by the separation of platinum with TBP or TOA leaving rhodium in the raffinate.

• Journal of the Korean Chemical Society
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• v.61 no.6
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• pp.339-345
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• 2017

Carbonaceous adsorbent (CA-WTP) was prepared by heat treatment at $400^{\circ}C$ for 2 h in N2 atmosphere using waste tire powder (WTP). WTP and CA-WTP were first characterized by thermo-gravimetric analysis (TGA), energy dispersive X-ray spectrometer (EDS), scanning electron microscopy (SEM), specific surface area analysis (BET) and FT-IR spectroscopy. Then, they were tested as adsorbents for removal of Cd in water. CA-WTP exhibited much higher specific surface area and total pore volume than WTP itself and showed higher adsorption capacity for Cd. Equilibrium data of adsorption were analyzed using Freundlich and Langmuir isotherm models. It was seen that both Freundlich and Langmuir isotherms have correlation coefficient $R^2$ value larger than 0.95. The results of studies indicate that CA-WTP developed from WTP by heat treatment could be used as efficient adsorbent for the removal Cd from water.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.11a
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• pp.241-242
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• 2000

환경부 고시 제2000-71호에 의하면 휘발성 유기화합물질의 규제제품 및 물질 종류는 methanol, acetaldehyde 및 toluene 등을 포함하여 37종으로 고시하고 있다(환경부, 2000). 미국의 경우 1997년 VOCs 발생원에 대한 배출량 산정을 보면 총 19,216 ton/yr의 VOCs가 배출되고 있으며, 이 중 7,660ton/yr인 39.86%가 자동차에서, 용매 이용시설에서 33.74%, VOCs 저장 및 운송에서 7.17% 및 석유관련 산업에서 2.80% 등의 순서로 배출되는 것으로 보고되고 있다(Noel do Hovers, 2000). (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.337-338
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• 2002

VOCs는 독성이 있고 돌연변이성, 발암성, 기형성을 유발하는 물질로 알려져 있으며 특히 대기질에서는 오존과 광화학스모그의 전구체로서 대기환경오염의 주요지표로 이용하는 국가가 증가하는 추세이다. 우리나라에서는 1999년부터 대기환경보전법 제8조 2항 규정에 의하여 대기환경규제지역내 (석유화학 정제업, 자동차 제조업, 주유소, 자동차 정비업소, 세탁시설, 기타제조업 등) VOCs를 규제토록 되어 있다(환경부, 1999). (중략)

• Journal of Korea Society of Waste Management
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• v.35 no.7
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• pp.660-669
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• 2018

Domestic automotive shredder residue (ASR) recycling facilities must comply with 60% of the energy recovery criteria calculated by the waste control act, based on resource circulation of electrical and electronic equipment and vehicles. The method of calculating energy recovery criteria was newly enacted on November 6, 2017, and it has been judged that it is necessary to consider applicability. In this study, the energy recovery efficiency of 7 units was calculated by past and present calculation methods. Furthermore, this study attempts to find applicability and a method of increasing the energy recovery efficiency by taking advantage of available potentials. An analysis of the calculation results showed that the average values calculated by past methods, present methods, and the method that includes available potentials are 76.35%, 70.68%, and 78.24%, respectively. Therefore, the new calculation method for energy recovery efficiency is also applicable to domestic automotive shredder residue recycling facilities.

• Journal of the Society of Disaster Information
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• v.9 no.4
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• pp.476-483
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• 2013

In this study, discharged nylon fibers were added to asphalt concretes to be compared with fatigue life and analyzed in economic point of view. A four point bending fatigue test was conducted, and as a result, nylon fiber reinforced asphalt concretes that showed a 10percent increase in fatigue life compared to ordinary asphalt concrete. The economic analysis confirmed that the maintenance cost was decreased by 540 million won throughout the analyzing period. It is thought discharged nylon fiber reinforced asphalt will cause more economic and social effects than was shown by life cycle cost analysis.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.536-538
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• 2009

현재 세계 각 국은 폐차에 의한 환경오염을 줄이기 위하여 규제를 강화하고 있으며 특히 EU(European Union)에서는 현재 85%에 머무르고 있는 재활용율을 2015년까지 95%로 올릴 것을 요구하고 있다. 이에 발맞추어 2007년 우리나라도 "전기전자제품 및 자동차의 자원순환에 관한 법률"을 제정하였다. 자동차 중량의 75%를 차지하는 철은 비교적 높은 재활용율을 보이고 있으나 나머지 25%를 구성하는 플라스틱, 유리 고무 등의 비금속류와 구리, 니켈 알루미늄 등의 비철금속류는 재활용율이 이에 미치지 못하고 있다. 본 논문에서는 자동차에서 많이 사용되는 대표적인 비철금속인 구리에 대하여 재활용의 현주소를 점검하고 앞으로의 개선책을 논의하고자 한다.