Abstract
The separation and enrichment can be targeted to enrich in fly ash and reduce the cost of leaching and recovering of fly ash. Regarding their different properties, the single-component separation was used to obtain uncompleted burned carbon, glass microbeads, minerals, and other characteristic components from the ash. Also, the mineral composition of each component was analyzed by electron microscopy. The metal minerals were mainly concentrated in the mineral components. Besides, the electron probe microanalysis shows that the Pt content in the minerals of fly ash was significantly correlated with the metal contents of Ni and Cu. After the obtainment of the characteristics of fly ash metal enrichment, the heavy minerals with Cu, Ni, Pt, Pd, and other target metal elements were enriched by gravity separation and flotation. The enrichment coefficients of Cu, Ni, Pt, and Pd were 1.45, 1.33, 1.90, and 1.60, respectively, and the recovery rates were 77%, 81%, 97%, and 88%, respectively. Since the yield of heavy minerals obtained by separation was 62.24%, it indicated the physical separation method could significantly reduce the cost of leaching and recovering of fly ash metal resources.
Highlights
Metals in y ash are mostly scattered elements associated with deposits, which have low contents and recovery values [13, 14], and there are up to 316 minerals in y ash [15]. e metals could be recovered by leaching process e ectively [16, 17]
Most of the minerals of the ash were alkaline substances [20, 21]. e alkaline material consumes a large amount of acid, leading to the high cost of leaching reagents. erefore, the enrichment of metals and the removal of the alkaline substances should be carried before the leaching process. e enrichment could be realized by the mineral separation method [22], and the recovery value of rare metals would be promoted
Pt was detected within the coal fly ash which was the coal seams in Western Guizhou Province. e uncompleted burned carbon and glass microbeads can be sorted with the single component separation process. e mineralogical analysis shows that uncompleted burned carbon was porous substances and glass microbeads were mainly the amorphous phase of silicate
Summary
Metals in y ash are mostly scattered elements associated with deposits, which have low contents and recovery values [13, 14], and there are up to 316 minerals in y ash [15]. e metals could be recovered by leaching process e ectively [16, 17]. Most of the minerals of the ash were alkaline substances [20, 21]. Erefore, the enrichment of metals and the removal of the alkaline substances should be carried before the leaching process. E enrichment could be realized by the mineral separation method [22], and the recovery value of rare metals would be promoted. Advances in Polymer Technology the separation and enrichment of characteristic minerals for the ash are insufficient [23]. Us, it is imperative to study the metals distribution characteristics and to study the separation technology for the enrichment of the rare metals in fly ash, aiming to provide some empirical basis for the comprehensive recovery of rare and precious metals from the fly ash Fly ash mainly includes four components such as vitreous, magnetic material, hollow microbeads, and uncompleted burned carbon [15], and different components has significant differences of the minerals composition [1]. us, it is imperative to study the metals distribution characteristics and to study the separation technology for the enrichment of the rare metals in fly ash, aiming to provide some empirical basis for the comprehensive recovery of rare and precious metals from the fly ash
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