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Optimizing the selective precipitation of iron to produce yellow pigment from acid mine drainage
•The billion litters of acid mine drainage (AMD) are produced every day.•AMD have high content of iron and acidity that cause great environmental damage.•Selective precipitation of Iron produce iron oxide with high purity without Al, Zn and Mn contaminates.•Iron sludge without contaminants can be co...
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Published in: | Minerals engineering 2019-05, Vol.135, p.111-117 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | •The billion litters of acid mine drainage (AMD) are produced every day.•AMD have high content of iron and acidity that cause great environmental damage.•Selective precipitation of Iron produce iron oxide with high purity without Al, Zn and Mn contaminates.•Iron sludge without contaminants can be converted to yellow pigment (goethite) through alkaline precipitation.
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. |
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ISSN: | 0892-6875 1872-9444 |
DOI: | 10.1016/j.mineng.2019.02.040 |