Methods for producing alumina from clay—an evaluation

Peters, F. A.; Kirby, Ralph C.; Higbie, Kenneth B.

doi:10.1007/bf03378647

Cited by 17 publications

(18 citation statements)

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“…Usually, these methods involve suspending kaolin in a water solution of an inorganic acid (HCl, H 2 SO 4 , HNO 3 ) to render Al and other metals soluble (Ford, 1992;Hulbert and Huff, 1970;Ziegenbalg and Haake, 1983). Other methods use inorganic salts such as (NH 4 ) 2 SO 4 , NH 4 HSO 4 (Bayer et al, 1982;Davies et al, 1945;Fetterman and Sun, 1963;Fouda et al, 1993;Nagaishi et al, 1982;Peters et al, 1965;Seyfried, 1949;St. Clair et al, 1944), or NaHSO 4 (Garcia-Clavel et al, 1979, 1985Martinez-Lope et al, 1991;Solano and Juan, 1995) that are calcined with kaolin to produce mixtures of Al sulfates and/or Na-Al sulfates together with unreacted kaolin.…”

Section: Introductionmentioning

confidence: 99%

A New Extraction Procedure for Simultaneous Quantitative Determination of Water-Soluble Metals in Reaction Products of Clays and Inorganic Salts

Colina

Esplugas

Costa

2002

Clays and clay miner.

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Kaolin, a possible source of Al, may be reacted with inorganic acids or salts to form different Al salts that can be further processed to prepare metallic Al. Although the reaction of kaolin and acid in aqueous solution can be monitored by chemical analysis of Al, the Al salts must be extracted from any unreacted kaolinite. Also, the lixiviation of Ti or Fe species present in kaolin should be monitored. A simple extraction procedure is reported to determine, quickly and quantitatively, water-soluble Al, Ti and Fe metals present in products of reaction of kaolin (85 wt.% kaolinite, 12 wt.% mica, 2 wt.% feldspar, 1 wt.% quartz) with inorganic salts, such as sodium hydrogensulfate, using conventional glassware for the glass reaction tubes. Optimum results are obtained with 250 mL glass reaction tubes. The best operating conditions found for this piece of equipment are: (1) sample weight of 0.05 g, (2) lixiviation time of 1 h, and (3) lixiviating agent, 50 mL of an aqueous solution of pH = 1 H 2 SO 4 at its boiling point. Comparisons are made with soxhlet extraction and beaker and magnetic stirring methods.

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Section: Introductionmentioning

confidence: 99%

A New Extraction Procedure for Simultaneous Quantitative Determination of Water-Soluble Metals in Reaction Products of Clays and Inorganic Salts

Colina

Esplugas

Costa

2002

Clays and clay miner.

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“…Peters et al (57) reported several sulfuric processes, similar in many aspects but each with its own method ot.…”

Section: Utilization Of and Current Research On Fly Ash In The Unitedmentioning

confidence: 99%

“…This reaction may be represented by the Equation The aluminum sulfate is then calcined to product alumina. Reports have shown that 80 to 98% of the alumina can be recovered by this process (26,59).…”

Section: Utilization Of and Current Research On Fly Ash In The Unitedmentioning

confidence: 99%

“…Since then, there has been substantial research reported by the United States Bureau of Mines on producing alumina from clay (31,32,33,55,56,57,58,59,60,61 It is the purpose of this thesis to examine and explore the potential for utilizing power plant fly ash as an alternative source of domestic aluminum and iron. The research is focused on the extraction process of alumina from the nonmagnetic part of fly ash.…”

Section: Introduction 1 Literature Reviewmentioning

confidence: 99%

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Aluminum recovery from coal fly ash by high temperature chlorination

Wijatno¹

1977

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“…Nevertheless, the search for new processes and new materials still went on (1,72,83). After the 1973 oil embargo, the United States, in anticipation of a possible critical supply situation in imported bauxite, once again increased the effort to find an economical process to produce aluminum from domestic nonbauxite resources (7).…”

Section: Introductionmentioning

confidence: 99%

Formation of calcium aluminates in the lime sinter process

Chou

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Methods for producing alumina from clay—an evaluation

Cited by 17 publications

References 0 publications

A New Extraction Procedure for Simultaneous Quantitative Determination of Water-Soluble Metals in Reaction Products of Clays and Inorganic Salts

A New Extraction Procedure for Simultaneous Quantitative Determination of Water-Soluble Metals in Reaction Products of Clays and Inorganic Salts

Aluminum recovery from coal fly ash by high temperature chlorination

Formation of calcium aluminates in the lime sinter process

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