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2019 Vol.56, Issue 6 Preview Page

Research Paper

Leaching Behavior of Palladium and Silver from Spent Petrochemical Catalysts by Nitric and Hydrochloric Acid Solutions

석유화학 폐촉매로부터 질산과 염산에 의한 팔라듐과 은의 침출거동

Yoon Sil Moon1
,
Hyunju Lee2
,
Jae-chun Lee12
,
Soo-kyung Kim12*
문 윤실1
,
이 현주2
,
이 재천12
,
김 수경12*
1과학기술연합대학원대학교 자원순환공학과
2한국지질자원연구원 자원회수연구센터
* Corresponding Author
31 December 2019. pp. 596-604
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Abstract

In this study, the leaching behavior of palladium and silver from spent catalysts generated in petro-chemicals was investigated using nitric and hydrochloric acid as lixiviant solutions. The effects of nitric and hydrochloric acid concentrations, different leaching temperatures and times, and different pulp densities on the leaching efficiencies of palladium and silver were examined, and results were compared. Based on these parameters, optimal leaching conditions were established. When nitric acid (2.0 M HNO3, 90°C, 1 h) was applied, silver was completely leached out, whereas the leaching efficiency of palladium was found to be low at approximately 45%. By contrast, the use of hydrochloric acid as a leachate agent (4.0 M HCl) at 90°C for 1 h yielded nearly 100% efficiency for each of the two metals. The rate of palladium leaching was governed by a mixed (chemical and diffusion) control model with an activation energy of 6.4 kcal/mol in the temperature range of 25-90°C.

Keywords
Petrochemical spent catalysts
Palladium
Silver
Leaching behavior
Kinetic study

본 연구에서는 석유화학 산업의 수소첨가 크래킹 공정에서 발생하는 폐촉매로부터 질산과 염산에 의한 팔라듐과 은의 침출거동을 조사하였다. 질산과 염산의 농도, 침출온도와 시간, 광액농도 등 다양한 실험조건에서 팔라듐과 은의 침출실험을 수행하였으며, 이를 바탕으로 속도론적 분석을 통한 최적 침출조건을 확립하였다. 질산을 침출제로 사용하였을 경우 질산농도 2.0 M, 침출온도 90°C, 침출시간 60분에서 은은 완전히 침출되었지만 팔라듐은 약 45%의 침출율을 나타내었다. 반면 염산의 경우 염산농도 4.0 M, 침출온도 90°C, 침출시간 60분의 침출조건에서 팔라듐과 은이 완전히 침출되었다. 침출반응의 속도론적 고찰을 통해 염산에 의한 팔라듐 침출 반응의 활성화 에너지는 6.4 kcal/mol이었고 화학율속과 확산율속이 혼합된 반응임을 확인하였다.

키워드
석유화학 폐촉매
팔라듐
은
침출거동
속도론적 해석
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 56
  • No :6
  • Pages :596-604
  • Received Date : 2019-10-18
  • Revised Date : 2019-11-14
  • Accepted Date : 2019-12-20
  • DOI :https://doi.org/10.32390/ksmer.2019.56.6.596
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