Open AccessPurification of fused alumina by high temperature calcination in vacuum
Author(s) -
G. E. Belyaev,
A. V. Grigоrenko,
Mikhail S. Vlaskin,
I. A. Lipatova,
Е. И. Школьников,
А. З. Жук
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1385/1/012041
Subject(s) - calcination , porosity , materials science , specific surface area , particle size , impurity , particle (ecology) , particle size distribution , mineralogy , analytical chemistry (journal) , chemical engineering , metallurgy , chromatography , chemistry , composite material , catalysis , biochemistry , oceanography , organic chemistry , engineering , geology
The aim of present study was the investigation of purification efficiency of industrial white fused alumina at high-temperature calcinations, in vacuum. Three powder samples of alumina with different initial purity and particle size distribution were studied. The impurities amount in the white fused alumina powder decreased by factor 10 after vacuum calcinations. White fused alumina samples were almost completely cleared of Na, Mg, K, Mn, Cu and Zn. The iron content in the studied samples decreased by factor 8–10. Comparison of the granulometric composition and specific surface area of samples, showed that samples look like sets of porous grains with the average sizes between 16–60 μ m. In turn, porous grains are composed of dense micro-particles with a characteristic size of 0.4–0.7 μ m. The specific surface area of grains lies in the range 2.8–3.3 cm 2 /g. Relatively high rate of purification takes place due to porous structure and high surface area of the samples.