Determination of extraction equilibria for several metals in the development of a process designed to recover aluminum and other metals from coal combustion ash

Seeley, F.G.; McDowell, W.J.; Felker, L. K.; Kelmers, A.D.; Egan, B.Z.

doi:10.1016/0304-386x(81)90045-1

Cited by 25 publications

(11 citation statements)

References 6 publications

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“…Primary amines have shown the best promise of extracting impurities from CFA sulfate solutions. Seeley et al [46], used Primene JMT-T in toluene to purify CFA leach solutions. Alguacil et al [47] used the primary amine Primene 81R to extract iron (III) from aluminum sulfate solutions in the presence of various impurities such [45] examined the removal of iron from industrial grade aluminum sulfate using the primary amine N-1923 and got good extraction and selectivity at pH above 1.2.…”

Section: Solvent Extraction Processesmentioning

confidence: 99%

Towards the Utilization of Fly Ash as a Feedstock for Smelter Grade Alumina Production: A Review of the Developments

Sibanda

Ndlovu

Dombo

et al. 2016

J. Sustain. Metall.

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The major commercial technology for the production of smelter grade alumina has conventionally been the Bayer process which converts bauxite ore, an aluminum containing ore which typically contains about 50 % Al 2 O 3 , into smelter grade alumina that contains over 99.0 % Al 2 O 3 . Another potential source of aluminum that is receiving renewed attention is coal fly ash (CFA), which is a by-product of coal combustion during electricity generation in power stations. Most coal fly ash found around the world contain typically between 25 and 35 % Al 2 O 3 , which is substantial to make CFA a potential alternative source of alumina. There has been some considerable research effort, in the last two decades, aimed at extracting aluminum from this semi-waste product. Much emphasis from the different workers has been on the leaching of the contained aluminum, while the purification and recovery of alumina from the liquor solution has received less attention. Notwithstanding that several patents on the processes to recover alumina from CFA exist, limited commercialisation of the processes has been reported. This paper seeks to review and discuss the hydrometallurgical extraction processes that have been formulated and tested by different workers and then assesses the available opportunities and the way forward on the prospects of commercially extracting alumina and other valuable components from this abundant resource.

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Section: Solvent Extraction Processesmentioning

confidence: 99%

Towards the Utilization of Fly Ash as a Feedstock for Smelter Grade Alumina Production: A Review of the Developments

Sibanda

Ndlovu

Dombo

et al. 2016

J. Sustain. Metall.

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show abstract

“…The XRF fusion analysis of the sintered pellets indicates that the sintered pellets contained 30.16% SiO 2 The LOI, which is now out of specification, can be used in structural concrete. However, a LOI of 25% is permissible when aggregates having SO 3 contents below 1% to be used in masonry concrete [17] .…”

Section: Characterization Of the Sintered Pellets And Leached Residuementioning

confidence: 99%

“…On the other hand, there is a growing concern for an imminent shortage of aluminum from domestic sources in China. Although leaching processes for the recovery of aluminum from coal fly ash(CFA) or clay have been developed a long time ago [2] , there have been few studies of the extraction aluminum from boiler slag. This produces the concept of recovering aluminum and some other metals from boiler slag.…”

Section: Introductionmentioning

confidence: 99%

Extraction of aluminum and iron from boiler slag by sulfuric acid

Hou

Gan

et al. 2007

Wuhan Univ. J. of Nat. Sci.

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This paper presents a new method of recycling aluminum and iron in boiler slag derived from plants that use coal as fuel. The new method integrates efficient extraction and reuse of the leached pellets together. An elemental analysis of aqueous solutions leached by sulfuric acid was determined by EDTA-Na 2 -ZnCl 2 titration method. 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 at solid/ liquid [m(g)/V(mL)] ratio of 1∶5 at 80 for 24 h. An iron extra ℃ ction efficiency of 94.60% was achieved in the same conditions for the maximum extraction efficiency of Al. The extraction efficiencies of Al and Fe increased with an increase in 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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“…On the other hand, there is a growing concern for an imminent shortage of aluminum from domestic sources in China. Although leaching processes for the recovery of aluminum from coal fly ash(CFA) or clay have been developed since a long time ago [2] , there have been few studies of the extraction aluminum from boiler slag. This produces the concept of recovering aluminum and some other metals from boiler slag.…”

Section: Introductionmentioning

confidence: 99%

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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Determination of extraction equilibria for several metals in the development of a process designed to recover aluminum and other metals from coal combustion ash

Cited by 25 publications

References 6 publications

Towards the Utilization of Fly Ash as a Feedstock for Smelter Grade Alumina Production: A Review of the Developments

Towards the Utilization of Fly Ash as a Feedstock for Smelter Grade Alumina Production: A Review of the Developments

Extraction of aluminum and iron from boiler slag by sulfuric acid

Extraction of metals from boiler slag by sintering

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