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산화·환원법에 의한 폐텅스텐 스크랩의 재활용에 관한 기초연구 KCI 등재

Basic Study on the Recycling of Waste Tungsten Scraps by the Oxidation and Reduction Process

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한국분말야금학회지 (Journal of Korean Powder Metallurgy Institute)
한국분말재료학회(구 한국분말야금학회) (Korean Powder Metallurgy Institute)
초록

This study is carried out to obtain basic data regarding oxidation and reduction reactions, originated on the recycling of waste tungsten hard scraps by oxidation and reduction processes. First, it is estimated that the theoretical Gibbs free energy for the formation reaction of WO2 and WO3 are calculated as ΔG1,000K= -407.335 kJ/mol and ΔG1,000K = -585.679 kJ/mol, from the thermodynamics data reported by Ihsan Barin. In the experiments, the oxidation of pure tungsten rod by oxygen is carried out over a temperature range of 700-1,000oC for 1 h, and it is possible to conclude that the oxidation reaction can be represented by a relatively linear relationship. Second, the reduction of WO2 and WO3 powder by hydrogen is also calculated from the same thermodynamics data, and it can be found that it was difficult for the reduction reaction to occur at 1,027oC, in the case of WO2, but it can happen for temperatures higher than 1127oC. On the other hand, WO3 reduction reaction occurs at the relatively low temperature of 827oC. Based on these results, the reduction experiments are carried out at a temperature range of 500-1,000oC for 15 min to 4 h, in the case of WO3 powder, and it is possible to conclude that the reduction at 900oC for 2h is needed for a perfect reduction reaction.

저자
  • 김상욱(엔에이티엠(주) 부설연구소) | Sang-Uk Kim
  • 윤지석(엔에이티엠(주) 부설연구소) | Ji-seok Yun
  • 김태욱(엔에이티엠(주) 부설연구소) | Tae-Wook Kim
  • 조봉휘(엔에이티엠(주) 부설연구소) | Bong-Hwi Cho
  • 김인호(엔에이티엠(주) 부설연구소) | In-Ho Kim
  • 김상무(공주대학교) | Sang-Mu Kim
  • 송창빈(공주대학교) | Chang-Bin Song Corresponding Author