Study on Extraction of Alumina from Sericite Phyllite
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℃ carbonation temperature and pH=10.5 was relatively pure,with hexagonal plate-like crystals.The α-alumina could be acquired by calcination at 1200℃ 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.
sericite phyllite self-pulverization sintering alumina
Hongwei Zhao Kaiqi Liu Zhuang Li Zhaohui Huang
School of Materials Science and Engineering,China University of Geosciences(Beijing),Beijing 100083, Beijing Key Laboratory of Advanced Ceramic and Refractories,China Iron and Steel Research Institute Research Institute of Hen Nan Coal and Chemistry Industry Group,Zhengzhou 450046,P.R.China School of Materials Science and Engineering,China University of Geosciences(Beijing),Beijing 100083,
国际会议
景德镇
英文
38-42
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）