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Sodium aluminate leaching and desilication in lime-soda sinter process for alumina from coal wastes

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Abstract

Sodium aluminate in the sinter produced from coal wastes using the lime-soda sinter process can be leached with dilute alkaline solutions. The extraction of alumina by leaching with water and sodium hydroxide solutions was comparable to extraction by leaching with Na2CO3 solutions. However, leaching with water dissolved the least amount of silica. The optimal conditions for water leaching were determined to be temperatures of 60 to 70 °C and times of 30 to 40 minutes. The sodium aluminate solution obtained under these conditions readily responded to desilication with Ca(OH)2 suspensions at atmospheric pressure, reducing the silica-to-alumina ratio to less than 10-3, which is lower than the specification for reduction-grade alumina.

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Authors and Affiliations

  1. Department of Metallurgy and Metallurgical Engineering, The University of Utah, 84112-1183, Salt Lake City, UT

    R. Padilla (Research Associate) & H. Y. Sohn (Professor)

Authors
  1. R. Padilla
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  2. H. Y. Sohn
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Formerly Graduate Student in Metallurgy

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Padilla, R., Sohn, H.Y. Sodium aluminate leaching and desilication in lime-soda sinter process for alumina from coal wastes. Metall Trans B 16, 707–713 (1985). https://doi.org/10.1007/BF02667507

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  • DOI: https://doi.org/10.1007/BF02667507

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