• Title/Summary/Keyword: Materials recycling

Search Result 1,716, Processing Time 0.026 seconds

Recycling Technology of Crosslinked-Polymers Using Supercritical Fluid (초임계 유체를 이용한 가교고분자 재활용기술)

  • Koo, Chong-Min;Yu, Si-Won;Baek, Bum-Ki;Cho, Hang-Kyu;Lee, Youn-Woo;Hong, Soon-Man
    • Elastomers and Composites
    • /
    • v.47 no.2
    • /
    • pp.111-120
    • /
    • 2012
  • Industrial wastes of crosslinked polymers have been burned or disposed of in landfills because there is no recycling technology due to their insoluble and infusible network chain structure. However, recycling of cross-linked polymers has been taken a growing attention because of issues of environmental pollution and of resources conservation. In this paper, uprising recycling technologies of crosslinked polymers using supercritical fluid are reviewed.

Recycling Technology of Aluminum UBC To Can Body Sheets

  • Lim, Cha-Yong;Kang, Seuk-Bong
    • Proceedings of the IEEK Conference
    • /
    • 2001.10a
    • /
    • pp.173-178
    • /
    • 2001
  • The materials processing factors such as remelting and casting, heat treatment and microstructure, sheet rolling and can body forming in the aluminum can-to-can recycling procedure have been investigated. Aluminum used beverage can(UBC) was remelted together with virgin aluminum. The ceramic filter was used during casting to remove large impurities. As-cast microstructure was composed of large intermetallic compound (mainly $\beta$ -phase) distributed in the aluminum matrix. By heat treatment, $\beta$ -phase was transformed to $\alpha$ -phase which was also formed from $Mg_2$Si particles. The heat treated ingots were hot-rolled at 48$0^{\circ}C$ and cold-rolled to thin sheets. Can making from this thin sheets was successful and earing was measured after can making. There was a critical cold reduction rate for minimum earing. Some cracks were initiated from the impurity particles which was not removed during filtering.

  • PDF

Recyling of Waste Materials for Iron Ore Sintering (제철소내 폐기물의 소결공정에서의 이용기술)

  • 문석민;이대열;정원섭;신형기
    • Resources Recycling
    • /
    • v.3 no.3
    • /
    • pp.12-20
    • /
    • 1994
  • Difficulties lies on using the dust from iron making process as a raw material for sintering process mainly because of high amount of Zn or alkali content and its ultra fine characteristics. To eliminate these toxic influence, new fluxing materials were tested and could get a very successful results. This fluxing materials, Calcium-ferrite of magnesio-ferrite were made from various waste materials such as lime stone sludge, bag filter dust, waste EP dust and dolomite sludge by simple way of pre-sintering. Sintering behavior as a fluxing materials was revealed to be good in any aspects and new concept of total recycling system could be established.

  • PDF

Dissolution Technology Development of E-Glass Fiber for Recycling Waste of Glass Fiber Reinforced Polymer

  • Lee, Suyeon;Kim, Woo Sik
    • Journal of the Korean Ceramic Society
    • /
    • v.56 no.6
    • /
    • pp.577-582
    • /
    • 2019
  • Recently, E-glass fiber is the one of most widely used ceramic fiber for aerospace fields. Recycling technology for waste of wind power blades is arising issue for reasons of low manageability and high cost of wastes. Though glass fiber is perfectly dissolved in hydrofluoric acid, low cost for recycling and harmless to human is important for recycling of blades. Chemically melted glass fiber will be used as different purpose like accelerator of hardening for shotcrete. In this study, dissolution process of glass fiber is tested in NaOH solution at low temperatures. In addition, difference in diameter reduction of glass fiber is observed by various alkali concentration and reaction times, treatment temperatures using FE-SEM.

MODELING OF AUTOMOTIVE RECYCLING PLANNING IN THE UNITED STATES

  • CHOI J.-K.;STUART J. A.;RAMANI K.
    • International Journal of Automotive Technology
    • /
    • v.6 no.4
    • /
    • pp.413-419
    • /
    • 2005
  • The United States automotive recycling infrastructure has successfully reduced the amount of automotive waste sent to landfills, especially since the introduction of shredders in the late 1950s. Shredders are necessary to process and recycle automotive hulks and other durable goods. However, this industry faces significant challenges as the automotive manufacturers are increasing the use of nonmetallic components which are difficult to recycle. Additionally, it is becoming obvious that automobiles contain hazardous materials which place heavy burdens on the environment. To address this growing concern, we propose a process planning model for automotive shredders to make tactical decisions regarding at what level to process and at what level to reprocess feed stock materials. The purpose of this paper is to test analytical models to help shredders improve the profitability and efficiency of the bulk recycling processes for end of life automobile returns. The work is motivated by an actual recycling problem that was observed at Capitol City Metals shredding facility in Indianapolis, Indiana.

Industrialization Trend of Remanufacturing and Recycling Technology in Korea and Overseas (재(再)제조.자원순환기술의 국내외 산업화 동향)

  • Jung, Won;Lee, Hee-Jung
    • Journal of Applied Reliability
    • /
    • v.10 no.3
    • /
    • pp.199-211
    • /
    • 2010
  • Recycling involves processing used materials into new products and remanufacturing is an industrial process in which worn-out products are restored to like-new condition. Recycling and remanufacturing industry is environmentally and economically important industry and provides significant benefits to prevent waste of potentially useful materials and reduce energy usage. The purpose of this research is to investigate the trend of recycling and remanufacturing industry in Korea and other countries like Germany, Japan and America. The yield information is generally quite valuable to promote green growth industry as an important alternative in the 21st century.