2021
DOI: 10.3390/ma14247700
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Kinetics Study of Al Extraction from Desilicated Coal Fly Ash by NaOH at Atmospheric Pressure

Abstract: The most promising source of alumina in the 21st century is the coal fly ash (CFA) waste of coal-fired thermal plants. The methods of alumina extraction from CFA are often based on the pressure alkaline or acid leaching or preliminary roasting with different additives followed by water leaching. The efficiency of the alumina extraction from CFA under atmospheric pressure leaching is low due to the high content of acid-insoluble alumina phase mullite (3Al2O3·2SiO2). This research for the first time shows the po… Show more

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Cited by 19 publications
(13 citation statements)
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“…Figure 1 shows the results of XRD analysis of CFA and DCFA samples. Particle size distribution of DCFA can be found elsewhere [29,30]. The desilication process appeared to result in the absence of an amorphous gl mass in DCFA (galo at 20-50° in the raw CFA).…”
Section: Raw Materialsmentioning
confidence: 95%
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“…Figure 1 shows the results of XRD analysis of CFA and DCFA samples. Particle size distribution of DCFA can be found elsewhere [29,30]. The desilication process appeared to result in the absence of an amorphous gl mass in DCFA (galo at 20-50° in the raw CFA).…”
Section: Raw Materialsmentioning
confidence: 95%
“…On the contrary, it exhibits a slight decrease. The residue remaining after HCl leaching is unlikely to be quartz, as it is represented by separate particles in the raw CFA [29]. At the same time, an amorphous phase (in the range of 30 • -40 • ) appears on the XRD pattern of the residue obtained at T = 170 • C and 190 • C. This can be the amorphous silica phase that remains after the Al is extracted from mullite.…”
Section: Solid Residue Characterisationmentioning
confidence: 99%
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“…The hydrometallurgical methods of ash processing described in the literature are divided into acidic [ 29 , 30 , 31 ], alkaline [ 16 , 32 , 33 , 34 ], and aqueous [ 10 , 22 , 23 , 27 , 35 ]. Beforehand, the material can be roasted using additives.…”
Section: Introductionmentioning
confidence: 99%
“…CFB combustion technology was developed after pulverized coal (PC) boilers so the research on ash utilization is lagging. CFB ash utilization has been studied in the literature in recent years including its use as a fine aggregate in compacted concrete [10], as a geopolymer [11,12], as a cement admixture [13][14][15][16][17], in road construction materials [18], and in metal recycling [19,20]. Among them, the best large-scale utilization of CFB ash is in the production of cement admixture materials [21].…”
Section: Introductionmentioning
confidence: 99%