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Recovery of Metal Resources from Wastes using Thermal Plasma

Research Project

Project/Area Number 05680387
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionTokyo Institute of Technology

Principal Investigator

KANZAWA Atsushi  Tokyo Inst.of Tech., Faculty of Eng.Professor, 工学部, 教授 (80010908)

Co-Investigator(Kenkyū-buntansha) SEKIGUCHI Hidetoshi  Tokyo Inst.of Tech., Faculty of Eng., Research Associate, 工学部, 助手 (50226643)
WATANABE Takayuki  Tokyo Inst.of Tech., Faculty of Eng.Research Associate, 工学部, 助手 (40191770)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Keywordsthermal plasma / wastes / resource recovery / ceramics / flyash / reaction mechanisms / リサイクル / 水素
Research Abstract

The purpose of the research is to teat flyash produced from a incinerator and to recover metal resources from the flyash using a reactive thermal plasma. As a fundamental study, five kinds of metal oxides were treated by the thermal argon plasma with the addition of four kinds of gases. The reaction mechanisms between the reactive plasma and metal oxides were estimated by considering the analyzes of products and residual sample, and calculation of Gibbs' free energy change. The results showed that the reaction passes were classified according to the following reaction ; thermal decomposition in the sample, surface reaction, thermal decomposition in gas phase, reaction in gas phase. The further study was carried out to elucidate the reaction mechanisms. Magnesia, silica and alumina were chosen as a metal oxide and hydrogen was added into the thermal argon plasma. In the treatments of magnesia and silica, hydrogen addition enhanced the decrease in the oxide samples. The weight decreasing rate was in proportion to the root of hydrogen concentration and the intensity of hydrogen atom emission, suggesting hydrogen atom took part in the reaction. Magnesium was recovered from the plasma treatment of magnesia, however silicon was not recovered from silica. According to the consideration of the experimental results, equilibrium compositions, and surface temperature, the reaction mechanisms was proposed including the deoxidation and evaporation. In alumina treatment, no weight change in the sample was observed because alumina was thermodynamically stable at estimated surface temperature. The study will be continued using mixed metal oxide samples and finally the recovery process in the plasma treatment of flyash will be proposed.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report

Research Products

(7 results)

All Other

All Publications (7 results)

  • [Publications] 伊藤康伸: "反応性熱プラズマによる焼却灰の処理に関する基礎的研究" 化学工学会第26回秋季大会研究発表講演要旨集. 2. 183- (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 渡辺隆行: "熱プラズマによる廃棄物からの金属資源回収" 金属. 64(3). 42-46 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Ito et.al.:

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] ""Hannousei purazuma niyoru shokyakubaino shorini kansuru kisoteki kenkyu"" Abstuct of 26th fall meeting of chemical Engineering. 2. 183 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Watanabe et.al.: ""Netsupurazuma niyoru haikibutsu karano kinzoku shigen kaishu" Kinzoku. 64(3). 42-46 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 伊藤康伸: "反応性熱プラズマによる焼却灰の処理に関する基礎的研究" 化学工学会第26回秋季大会研究発表講演要昏集. 2. 183 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 渡辺隆行: "熱プラズマによる廃棄物からの金属資源回収" 金属. 64(3). 42-46 (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1993-03-31   Modified: 2016-04-21  

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