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Optimizing the selective precipitation of iron to produce yellow pigment from acid mine drainage

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10.1016/j.mineng.2019.02.040
 
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hdl:2117/131913

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de Almeida Silva, Rodrigo
Secco, Marina Paula
Lermen, Richard Thomas
Homrich Schneider, Ivo André
Navarro Hidalgo, Gelsa Edith
Hoffmann Sampaio, CarlosMés informacióMés informacióMés informació
Document typeArticle
Defense date2019-05-01
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Acid mine drainage (AMD) in the coal mining industry is recognized as one of the major sources of environmental damage. The active treatment of AMD involves adding alkaline reagents to wastewater so as to raise pH and to precipitate dissolved metals in the form of oxides/hydroxides. Studies have shown that yellow pigment (goethite) can be produced from the iron present in AMD. However, the presence of other metals can prevent the formation of pigment. Therefore, this paper seeks to evaluate several processes for purifying iron sludge so as to obtain raw material that can be recovered from AMD and thereby obtain a good quality of yellow pigment. The experiments were carried out by causing precipitation with strong and weak bases and removing other metals from the sludge by washing and filtering the sludge or by centrifugation. The results show that the color, type and morphology of the compounds changed, depending on the number of contaminants, and that these factors are strongly dependent on the type of reagent and less dependent on the separation process and the repetition of washes.
Citationde Almeida, R. [et al.]. Optimizing the selective precipitation of iron to produce yellow pigment from acid mine drainage. "Minerals engineering", 1 Maig 2019, vol. 135, p. 111-117. 
URIhttp://hdl.handle.net/2117/131913
DOI10.1016/j.mineng.2019.02.040
ISSN0892-6875
Publisher versionhttps://www.sciencedirect.com/science/article/abs/pii/S0892687519301025
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  • Departament d'Enginyeria Minera, Industrial i TIC - Articles de revista [303]
  • GREMS - Grup de Recerca en Mineria Sostenible - Articles de revista [111]
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