Arsenic Trioxide Leaching and Scorodite Crystallization in Methanesulfonic Acid

Junmo Ahn, Jiajia Wu, Jaewoo Ahn, Jaeheon Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Arsenic, one of the most toxic elements, is a byproduct generated from metallurgical processes of arsenic-containing ores. Arsenic can be formed into an arsenic trioxide as a byproduct during the decopperization in electro-refining process when processing high arsenic-bearing copper minerals. However, arsenic trioxide has a very high arsenic mobility, so it requires to be re-dissolved and immobilized into scorodite (FeAsO4▪2H2O). In this study, methanesulfonic acid (MSA) was tested for both arsenic trioxide leaching and scorodite precipitation. Arsenic trioxide leaching tests showed the arsenic extraction of 80% at 21°C in MSA with H2O2 as an oxidant within 6 hours. Meanwhile, arsenic precipitation tests were conducted to achieve above 95% arsenic removal within 6 hours by the formation of scorodite at an initial pH of 0.5 and temperature of 80°C. In addition, coarser scorodite particles were formed in higher temperature and lower solution pH. The optimum condition for scorodite crystallization in MSA medium can be suggested to be at 80°C with the initial pH of 0.5.

Original languageEnglish (US)
JournalMineral Processing and Extractive Metallurgy Review
DOIs
StateAccepted/In press - 2021
Externally publishedYes

Keywords

  • Methanesulfonic acid
  • arsenic ferrihydrite
  • arsenic precipitation
  • arsenic trioxide leaching
  • decopperization
  • scorodite

ASJC Scopus subject areas

  • Chemistry(all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Economic Geology

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