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Evaporative Crystallization of Aluminum Chloride Hexahydrate.

PB92209261

Publication Date	1992
Personal Author	Nehl, F. H.; Nicks, L. J.
Page Count	16
Abstract	As part of a U.S. Bureau of Mines research program to study processes for extraction of alumina from domestic resources, a bench-scale evaporative crystallizer was operated with solutions of impure aluminum chloride hexahydrate (ACH). The purpose of the research was to determine the distribution of impurities in the bleedstream section of a proposed clay-Hcl process. Impurities including Mg, P, Na, K, Cr, and S were determined in ACH crystals produced from feed solutions with a threefold range of impurities and at varied crystallizer slurry percent solids. Phosphorus was the limiting contaminant; 0.83 pct of the process alumina would have to be discarded for control. Crystallizer slurry in the range of 10 to 25 pct solids had little effect on crystal purity.
Keywords	Aluminum oxide Aluminum halides Crystallization Bench-scale experiments Process solutions Materials recovery Impurities
Source Agency	Bureau of Mines
NTIS Subject Category	71N - Nonferrous Metals & Alloys 48A - Mineral Industries 99B - Industrial Chemistry & Chemical Process Engineering
Corporate Authors	Bureau of Mines, Reno, NV. Reno Research Center.
Document Type	Technical Report
NTIS Issue Number	199220

Evaporative Crystallization of Aluminum Chloride Hexahydrate.

Evaporative Crystallization of Aluminum Chloride Hexahydrate.
PB92209261

Publication Date	1992
Personal Author	Nehl, F. H.; Nicks, L. J.
Page Count	16
Abstract	As part of a U.S. Bureau of Mines research program to study processes for extraction of alumina from domestic resources, a bench-scale evaporative crystallizer was operated with solutions of impure aluminum chloride hexahydrate (ACH). The purpose of the research was to determine the distribution of impurities in the bleedstream section of a proposed clay-Hcl process. Impurities including Mg, P, Na, K, Cr, and S were determined in ACH crystals produced from feed solutions with a threefold range of impurities and at varied crystallizer slurry percent solids. Phosphorus was the limiting contaminant; 0.83 pct of the process alumina would have to be discarded for control. Crystallizer slurry in the range of 10 to 25 pct solids had little effect on crystal purity.
Keywords	Aluminum oxide Aluminum halides Crystallization Bench-scale experiments Process solutions Materials recovery Impurities
Source Agency	Bureau of Mines
NTIS Subject Category	71N - Nonferrous Metals & Alloys 48A - Mineral Industries 99B - Industrial Chemistry & Chemical Process Engineering
Corporate Authors	Bureau of Mines, Reno, NV. Reno Research Center.
Document Type	Technical Report
NTIS Issue Number	199220