الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The optimum conditions of the sulfate route for the processing of Rosetta ilmenite ore for the preparation of pigment grade TiO2 have been determined. In the studied route, it was found convenient to avoid working in an almost solid state and to explore the possibility of working in the fluid state under variable solid/liquid ratios. Accordingly, two series of experiments were performed under different solid/liquid ratios besides exploring the possibility of applying the sulfate route upon mixed ilmenite/Ti slag In a second part of the work, the purification of the leached titanium by solvent extraction using tri-octyl phosphine oxide (Cyanex 921 or TOPO) has also been studied. For this purpose, the studied
relevant extraction factors have involved the aqueous phase acidity, the
TOPO molarity, the time of extraction, the ratio of octanol as well as the effect of diluent and the A/O ratio Several experiments were also performed to study the stripping factors of titanium from the loaded tri-octyl phosphine oxide extractant The strip liquor obtained from the loaded TOPO using repeated cycles was then hydrolyzed to form the insoluble titanium hydroxide through the proper seeding technique. After calcination of the latter, pigment grade TiO2 product was obtained and was subjected to quantitative analysis and found to be actually devoid of Fe, Mn, Cr and V. Another sample similarly prepared was subjected to ESEM-EDX analysis and the
obtained result has proven its maximum purity (100% Ti In the meantime, the traditional sulfate process was also studied where the obtained product was found to assay up to higher than 99.8% TiO2, while the associated impurities of manganese, iron, vanadium and chromium assay were 80, 18, 10 and 4 as ppm.