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Role of Alumina-to-silica Mole Ratio in the Lime-soda Sinter Process.

Lundquist RV; Blue DD
NTIS: PB 196 682 :11 pages
Past reports by the Bureau of Mines have described the extraction of alumina from numerous aluminum silicate materials by the lime-soda sinter process. The results from pilot-plant investigations of six materials, with alumina-to-silica mole ratios from 0.3 to 8.7, Indicated a relationship between the alumina-silica ratios and the processing characteristics of the sinter. A series of laboratory tests was conducted to define this relationship. Sinter and leach tests determined that an alumina-to-silica mole ratio of 0.90 Or greater resulted in the best alumina and soda recoveries while leaving the leach slurries practically free from any tendency toward gelation. The widely different chemical and mineralogic properties of the various aluminous materials used in compounding the mixes had no perceptible effect on the leaching characteristics of the sinter. The blending of low-cost, high-alumina materials with aluminum silicate materials to give an alumina-to-silica mole ratio of 0.90 Or greater would improve alumina and soda extraction and minimize operating problems in the lime-soda sinter process.
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7434
NIOSH Division
Source Name
NTIS: PB 196 682
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division