PHD theses : Science

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    analysis classfikation and evaluation of major and tract elements in iron ores
    (Neelain University, 2006) AHmIED HASSAN HASAB ALLA
    In the ‘Sudan, large quantities and various types of iron ores are distributed. Some of these types are economically distinguish, because they contain high percentage of iron beside other some elements. Chemical analysis for eight samples and a standard sample of iron ores was carried out to determineltheir constituents and percentage of the iron and also some elements by different methods. The applied methods were compared together. - Potassium dichromate and potassium permanganate methods were used to titrate iron; ammonium hydroxide method was used to determined iron gravimetric; 1,10 phenanthroline , salicylic acid and ammonium thiocyanate methods were used to determine iron by spectrophotometric methods; Also atomic absorption spectrophotometer and X-ray fluorescence were used to determine iron and the other elements. The results indicated that determination of iron by: AAS was gave low results due to the chemical and physical interferences; 1.10 phenanthroline method gave good results except for samples 3and 8 which gave high results due to Mn interference; salicylic acid method gave satisfactory results excepts samples l, 3 and 7 which gave high results because Ni interference while sample 8 was gave low results due to phosphate and sulphate interferences; thiocyanate method gave high results in samples l, 8 and 9 due to Ti and Co and Ill