Study on Extraction of Alumina from Sericite Phyllite

Abstract:

Alumina from sericite phyllite was extracted by the way of limestone self-pulverization sintering technique. The key technical processes, including self-pulverization sintering, clinker leaching reaction and the carbonation decomposition, were investigated systematically. The results showed that the main phases of pulverized clinker consisted of γ-C₂S and C₁₂A₇, and the self-pulverization rate was 95% . The dissolution rate of Al₂O₃ clinker could reach 86.7% when the concentration of Na₂CO₃ solution was 7% and the solid-liquid ratio was 1:3. The Al(OH)₃ prepared at 80°C carbonation temperature and pH=10.5 was relatively pure, with hexagonal plate-like crystals. The α-alumina could be acquired by calcination at 1200°C with the content of 99.71% Al₂O₃ and 0.02% Na₂O. This work provided optimal technological parameters for effectively extracting alumina from the sericite and other inexpensive non-bauxite mineral resources with A/S ratio lower than 1.

• Periodical: Key Engineering Materials (Volume 544)
• Pages: 38-42
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.544.38
• Online since: March 2013
• Authors: Hong Wei Zhao, Kai Qi Liu, Zhuang Li, Zhao Hui Huang
• Keywords: Alumina, Self-Pulverization Sintering, Sericite Phyllite

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