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Title: Pelletizing and chemical processing of chromite
Author: Ng, Wing Kong
ISNI:       0000 0004 2737 1661
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 1963
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This thesis is concerned with the beneficiation and agglomeration of standard grade chromite concentrate with low chromium:iron ratio by a sequence of processes including pelletizing of the finely powdered concentrate, selective reduction of the iron oxide by carbon and removal of iron by leaching with acid. Fundamental principles which control or influence the various stages of the process were examined and are appraised here, k process of pelletizing fine chromite concentrate was evolved with a laboratory pelletizing drum. The following variables affecting the pelletizing process were investigated: (1) Seeding of the load in the drum (2) Moisture content of the feed and seeds (3) Loading of the drum (4) Drum diaaeter and drum velocity (5) Rolling time. The mechanisms deduced from these observations are Sintering and reduction of the pellets were examined and the influence of various binding agents on this process was investigated. Reflected light microscopy and I-ray microradiography were used to elucidate the mechanism of sintering and to detect textural and laineralogical changes in the agglomerates. The relationship between sintering temperature, amount of reducing agent incorporated and efficiency of removing iron by leaching are explained.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available