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Minerals in ore were evaluated by XRD & XRF. A number of parameters including solid/liquid ratio S/L, bowl rotation frequency, back water flow rate were studied on the process performance. At the optimum conditions a concentrate contain 62.16% Fe, and 7.62% SiO2 from the original contains 49.33% Fe, 21.18% silica was obtained and be used in the reduction process. This concentrate used in studying the different reduction processes after mineralogical study. [ABSTRACT FROM AUTHOR]

Cationic flotation is one of the most widely accepted technologies for upgrading siliceous iron ore using polysaccharides (mainly starches) as depressing agents for iron bearing minerals while floating silica with amines. In this paper, a group of starches are investigated as depressants for hematite. These starches are: wheat, corn, rice, potato, and dextrin. The role of starch type of the selectivity of separation process has been studied through zeta potential, adsorption measurements as well as flotation tests. The effects of type of starch and pH of the medium have been studied. The results indicated that the selectivity of the separation process is strongly affected by the type of starch used where better results are obtained with corn starch or wheat starch in comparison to the other types. FTIR measurements indicated that the interaction between starches and iron oxide surface are intermolecular interaction. [ABSTRACT FROM AUTHOR]