Effect of synthesis conditions on particle shape of scorodite

E. Shibata, Takashi Nakamura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An atmospheric process for the synthesis of scorodite (DMSP®) has been developed, in which ferrous ions were oxidized by oxygen gas in the presence of pentavalent arsenic ions. Under optimum conditions, the synthesized scorodite (FeAsO4・2H2O) was well crystallized and the crystals were faceted; the particle sizes were as large as 15 to 20 µm. In this study, iron (II) sulfate heptahydrate (FeSO4·7H2O), arsenic (V) acid (60 mass% H3AsO4) solution, and distilled water were used to prepare the original experimental solution (700 ml), in which the contents of Fe(II) and As(V) were 55.9 g/L and 50.0 g/L, respectively. The effects of various synthesis conditions, such as the type of oxidizing gas (oxygen or air), gas injection rate, temperature, and the initial pH of the solution, on the size and shape of the scorodite particles were investigated. From the experimental results, the changes in the shape of the scorodite particles were clarified for each synthesis condition.

Original languageEnglish
Title of host publicationIMPC 2016 - 28th International Mineral Processing Congress
PublisherCanadian Institute of Mining, Metallurgy and Petroleum
ISBN (Electronic)9781926872292
Publication statusPublished - 2016 Jan 1
Event28th International Mineral Processing Congress, IMPC 2016 - Quebec City, Canada
Duration: 2016 Sep 112016 Sep 15

Publication series

NameIMPC 2016 - 28th International Mineral Processing Congress
Volume2016-September

Other

Other28th International Mineral Processing Congress, IMPC 2016
Country/TerritoryCanada
CityQuebec City
Period16/9/1116/9/15

Keywords

  • Arsenic
  • DMSP®
  • Ferrous oxidation
  • Scorodite
  • Stabilization

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Earth-Surface Processes

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