Chemistry of the direct acid leach, calsinter, and pressure digestion-acid leach methods for the recovery of alumina from fly ash

Kelmers, A.D.; Canon, R.M.; Egan, B.Z.; Felker, L. K.; Gilliam, T.M.; Jones, G.; Owen, G.; Seeley, F.G.; Watson, J.S.

doi:10.1016/0166-3097(82)90081-5

Cited by 49 publications

(15 citation statements)

References 5 publications

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“…However, the aluminium extraction by DAL at low acid concentration and ambient temperature is not suitable for high recovery [54,55] showed that in alkaline solution only aluminium was extracted, to yield 55% recovery, as compared with 29% recovery in an acid system. The apparent low recovery of aluminium in low acid concentration may be due to the co-dissolution of silica and the subsequent formation of an unfilterable silica gel [58].…”

Section: Acid Leach Processes (1) Direct Acid Leach (Dal)mentioning

confidence: 99%

A review of the alumina recovery from coal fly ash, with a focus in China

Yao

Xia

Sarker

et al. 2014

Fuel

318

117

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Coal fly ash, an industrial by-product, is derived from coal combustion in thermal power plants. It is one of the most complex and abundant of anthropogenic materials, and its improper disposal has become an environmental concern and resulted in a waste of recoverable resources. Coal fly ash is rich in alumina, making it a potential substitute for bauxite. With the diminishing reserves of bauxite resources as well as the increasing demand for alumina, recovering alumina from fly ash has attracted extensive attentions. The present review first describes the alumina recovery history and technologies, and then focuses on the recovery status in China. Finally, the current status of fly ash recycling and directions for future research are considered.

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Section: Acid Leach Processes (1) Direct Acid Leach (Dal)mentioning

confidence: 99%

A review of the alumina recovery from coal fly ash, with a focus in China

Yao

Xia

Sarker

et al. 2014

Fuel

318

117

View full text Add to dashboard Cite

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“…Boiler slag from plants using coal as fuel in China typically contains 40 wt%-60 wt% SiO 2 , 18 wt%-38 wt% Al 2 O 3 , 2 wt%-7 wt% Fe 2 O 3 , 1 wt%-4 wt% CaO, 0.5 wt%-3.0 wt% MgO and 0.5 wt%-2.0 wt% TiO 2 (dried solid) according to Refs. [7,8]. The content of alumina is rich, so that extraction of aluminum from this boiler slag should be a valuable work.…”

Section: Introductionmentioning

confidence: 98%

Extraction of metals from boiler slag by sintering

Gan

Hou

2009

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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A new method of recycling aluminum and iron in boiler slag derived from plants that use coal as fuel was presented. The new method can integrate efficient extraction and reuse of the leached pellets together. An elemental analysis of aqueous solutions leached by sulfuric acid was conducted by the EDTA-Na 2 -ZnCl 2 titration method, and the components and microstructures of the samples were examined by means of XRF, XRD and SEM. An aluminum extraction efficiency of 86.50% was achieved when the sintered pellets were leached using 4 mol·L -1 H 2 SO 4 with solid/liquid ratio(m/V) of 1∶5 at 80 for 24 h. ℃ An iron extraction efficiency of 94.60% was achieved under the same condition for the maximum extraction efficiency of Al. The extraction efficiency of Al and Fe increased with temperature, leaching time and acidity. The concentration of alumina and iron hydroxide in the final product was determined to be 99.12% and 92.20% respectively. This product of alumina would be used directly for the production of metallic aluminum.

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“…It was found that the leaching process involved in a self-inhibition mechanism owing to precipitation of calcium sulfate on the surface of the CFA particles. Boiler slag from plants using coal as fuel in China typically contains 40-60% SiO 2 , 18-38% Al 2 O 3 , 2-7% Fe 2 O 3 , 1-4% CaO, 0.5-3.0% MgO and 0.5-2.0% TiO 2 (wt.% for dried solid) according to literatures reported [7,8]. The content of alumina is rich, so extraction of aluminum from this boiler slag is a valuable work.…”

Section: Introductionmentioning

confidence: 99%

Leaching of aluminum and iron from boiler slag generated from a typical Chinese Steel Plant

Gan

2009

Journal of Hazardous Materials

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Chemistry of the direct acid leach, calsinter, and pressure digestion-acid leach methods for the recovery of alumina from fly ash

Cited by 49 publications

References 5 publications

A review of the alumina recovery from coal fly ash, with a focus in China

A review of the alumina recovery from coal fly ash, with a focus in China

Extraction of metals from boiler slag by sintering

Leaching of aluminum and iron from boiler slag generated from a typical Chinese Steel Plant

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