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Development of Wet Recycling Process to Remove Tramp Elements from Scraped Steels

Research Project

Project/Area Number 11555181
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Material processing/treatments
Research InstitutionTokyo Institute of Technology

Principal Investigator

TSURU Tooru  Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (20092562)

Co-Investigator(Kenkyū-buntansha) ARAOKA Aya  Tokyo Institute of Technology, Graduate School of Science and Engineering, Research Associate Present : National Institute for Materials Science., 助手(研究員) (40323787)
KIHARA Hiroshi  Nippon Steel, Co., LTD, Research Institute of Steels, Senior Researcher, 鉄鋼研究所, 主任研究員
NISHIKATA Atsushi  Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (90180588)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥13,300,000 (Direct Cost: ¥13,300,000)
Fiscal Year 2001: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2000: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1999: ¥7,500,000 (Direct Cost: ¥7,500,000)
Keywordsscraped steel / tramp element / ammonia complex / recycling / recovery / passivity / current efficiency / copper / スクラップ鋼 / 回収 / 電流効率 / スクラップ / アンモニア塩 / 表面処理鋼板 / 亜鉛めっき鋼板
Research Abstract

Many recycling processes for scraped steels have been proposed in these decades, however, wet processes to remove tramp elements are very rare because of their processing speed. We proposed again to use wet process based on electrochemical method to remove zinc and copper which are major harmful elements for using recycled steels. In a concentrated nitric acid solution, zinc and copper easily dissolved contrasting steel dissolution which are negligible by complete passivation of steels. Moreover, stability the passive films on steels in nitric acid depends upon the concentration of nitrate ions. We finally proposed a method to remove and recover coppers from scraped steels by using aqueous ammonia solution and electrolysis. In aqueous ammonia solution, copper and zinc dissolved as ammonia complexes in neutral to alkaline solution, however, iron remains stable passive state. To accelerate dissolution rate of copper, the scraped steels containing sufficient amount of copper was anodically polarized and the dissolved copper was deposited to the counter electrode by the same current. Current efficiency of the anodic dissolution was almost 100 % and that of cathodic deposition reached to 70 %. The purity of the deposited copper exceeds 99.9 %. In this research, we designed a bi-potentiostate having a capability of 50 A and 50 V of output. Using this, the electrode potential of the counter electrode also controlled to maintain a suitable deposition potentials for copper. To extend the acceleration of copper dissolution, anodic dissolution mechanism of copper was analyzed using a rotating disk electrode. The dissolution is controlled by diffusion of ammonia to the electrode in a stagnant condition. In a condition of eliminating diffusion effect, the rate determining step is found a chemical reaction following the electron transfer reaction.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 水流 徹, 西方 篤, 片岡 敦: "リサイクル用スクラップ鋼材から湿式処理によるトランプ元素の除去・回収-銅の除去と回収-"材料と環境'99講演集. 287-290 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 水流 徹, 片岡 敦, 西方 篤: "スクラップ鋼材からのトランプ元素の湿式法による除去と回収"「21世紀の材料と環境を考える」東北大学金属材料研究所. 4 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 片岡 敦, 西方 篤, 水流 徹: "アンモニア錯体を利用したスクラップ鋼材からのトランプ元素の除去と回収"材料と環境2000講演集. 297-300 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 水流 徹, 片岡 敦, 西方 篤: "リサイクル用スクラップ鋼材の湿式処理(銅および亜鉛の除去と回収)"材料とプロセス. 13・5. 861 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 水流 徹, 西方 篤, 紀平 寛: "アンモニア水溶液中における銅のアノード溶解反応機構"材料と環境討論会. (発表予定). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tooru TSURU, Atsushi NISHIKATA and Atsushi KATAOKA: "Wet Recycling Process to Remove and Recover the Tramp Elements from Scraped Steels, Removal and Recovery of Copper"Proc. Zairyou-to-Kankyou '99. 287-290 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tooru TSURU, Atsushi KATAOKA and Atsushi NISHIKATA: "Wet Recycling Process to Remove and Recover the Tramp Elements from Scraped Steels"Proc. Materials and Environment in 21st Century, Research Institute of Metals, Tohoku Univ.. 4 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Atsushi KATAOKA, Atsushi NISHIKATA and Tooru TSURU: "Removal and Recovery of the Tramp Elements from Scraped Steels using Ammonia Complexes"Proc. Zairyou-to-Kankyou 2000. 297-300 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tooru TSURU, Atsushi NISHIKATA and Atsushi KATAOKA: "Wet Recycling Process for Scraped Steels (Removal and Recovery of Copper and Zinc)"Current Advances in Materials and Processes. 13-5. 861 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tooru TSURU, Atsushi NISHIKATA and Hiroshi KIHARA: "Aqueous Anodic Dissolution Mechanism of Copper in Aqueous Ammonia"Proc. Zairyou-to-Kankyou. (to be presented). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 片岡 敦, 西方 篤, 水流 徹: "アンモニア錯体を利用したスクラップ鋼材からのトランプ元素の除去と回収"材料と環境2000講演集. 297-300 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] 水流 徹, 片岡 敦, 西方 篤: "リサイクル用スクラップ鋼材の湿式処理(銅および亜鉛の除去と回収)"材料とプロセス. 13・5. 861 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] 水流 徹, 西方 篤, 紀平 寛: "アンモニア水溶液中における銅のアノード溶解反応機構"材料と環境討論会. (発表予定). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 片岡敦,西方篤,水流徹: "アンモニア錯体を利用したスクラップ鋼材からのトランプ元素の除去と回収"材料と環境2000講演集. 297-300 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 水流徹,片岡敦,西方篤: "リサイクル用スクラップ鋼材の湿式処理(銅および亜鉛の除去と回収)"材料とプロセス. 13・5. 861 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 水流徹,西方篤,片岡敦: "リサイクル用スクラップ鋼板から湿式処理によるトランプ元素の除去と回収-銅の除去と回収-"材料と環境99講演集. 287-290 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 水流徹,片岡敦,西方篤: "スクラップ鋼材からのトランプ元素の湿式法による除去と回収"「21世紀の材料と環境を考える」東北大金属材料研究所研究会. 4 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 片岡敦,西方篤,水流徹:

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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