Behavior of sulfate ions during biogenic scorodite crystallization from dilute As(III)-bearing acidic waters

Masahito Tanaka, Keiko Sasaki, Naoko Okibe

Research output: Contribution to journalArticle

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Abstract

This study revealed the importance of SO4 2− ions during biogenic scorodite crystallization via a two-stage As-removal process, using a combination of liquid and solid analyses (chemical digestion, FT-IR, SEM, TG-DTA, particle distribution). The first-stage As-removal was induced by microbial oxidation of Fe2+ and As(III), precipitating SO4 2−-bearing amorphous precursors composed of basic ferric sulfate (MFex(SO4)y(OH)z) and ferric arsenate (FeAsO4·(2 + n)H2O). This was followed by an induction period (a period of constant concentration), where dissolution-recrystallization of unstable amorphous precursors proceeded: Re-dissolved metal ions became locally concentrated on the surface of precursors, which gave the driving force for the second-stage As-removal as secondary layers of crystalline biogenic scorodite (Fe(AsO4)0.94(SO4)0.08·1.69H2O) out of even more dilute and seeded solution. This phase transformation process was also accompanied by continuous dehydration. This two-stage As-removal via SO4 2−-mediated phase transformation was shown to be key to promote biogenic scorodite formation with greater final As-removal from dilute As(III)-bearing solutions.

Original languageEnglish
Pages (from-to)144-152
Number of pages9
JournalHydrometallurgy
Volume180
DOIs
Publication statusPublished - Sep 1 2018

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Bearings (structural)
Crystallization
Sulfates
Ions
Water
Phase transitions
Dehydration
Differential thermal analysis
Metal ions
Dissolution
scorodite
Crystalline materials
Oxidation
Scanning electron microscopy
Liquids

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Behavior of sulfate ions during biogenic scorodite crystallization from dilute As(III)-bearing acidic waters. / Tanaka, Masahito; Sasaki, Keiko; Okibe, Naoko.

In: Hydrometallurgy, Vol. 180, 01.09.2018, p. 144-152.

Research output: Contribution to journalArticle

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