Open AccessProcessing of Local Bauxite to Obtain Highly Purified and Fine Alumina Powder
Author(s) -
I. I. Ibrahim,
Salmah Baharuddin,
Roshaida Arbain,
Abbas Kamil Othman,
Costantine Joannes
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/641/1/012004
Subject(s) - bauxite , gibbsite , raw material , leaching (pedology) , bayer process , precipitation , materials science , metallurgy , mineralogy , gravity separation , environmental science , chemistry , aluminium , soil science , soil water , physics , organic chemistry , meteorology
A study on local bauxite was conducted at Mineral Research Centre, Ipoh to produce highly purified fine alumina (Al 2 O 3 ) powder by using Bayer process as a basis. The study was conducted on a local bauxite from Johor. The raw material being classified having the specific gravity of 2.42 and the major constituent of mineral was identified as gibbsite in which indicates of having 58.7% Al 2 O 3 . Moreover, this raw material being classified as high silica content of bauxite ore because of the presence amount of SiO 2 was slightly more than 7.0%. Four (4) major processes were performed at Mineral Research Centre such as sample preparation, characterization of raw material, precipitation and characterization of product. In order to produce highly purified and fine alumina, some alternative on leaching and precipitation processes were studied. These due to leaching process tends to pre-determine the rate of recovery and the purity of alumina whereas a very effective precipitation process can be applied to produce fine size of alumina powder. This paper presents some results of leaching and precipitation processes and probably help to show how various processing parameters will affect the effectiveness of alumina recovery, purity as well as its sizes.