Abstract：The rapid and accurate determination of aluminum, titanium and phosphorus in high-purity ferrosilicon has important significance for the classification and warehousing of matter products to guarantee the quality of outgoing products and guide the smelting process and operation. Sample was dissolved with nitric acid and hydrofluoric acid. The silicon and fluorine were removed by secondary fuming of perchloric acid. The residual amount of perchloric acid after secondary fuming was effectively controlled. The mother solution was prepared in the medium of perchloric acid. The content of aluminum in mother solution was determined by chromazurine S spectrophotometry. The ions such as iron, manganese, copper and nickel were masked with Zn-EDTA. The titanium ions were masked with mannitol. The pH was controlled at about 5.7 with hexamethylenetetramine-hydrochloric acid buffer solution for coloring. The coloring solution with certain volume was treated with NH4F-EDTA solution for fading and used as blank. Then the content of aluminum (0.01%-0.35%, mass fraction) in high-purity ferrosilicon was determined. The content of titanium was determined by chromotropic acid spectrophotometry. The interference of iron (III) was eliminated with ascorbic acid. The pH was controlled at about 3 with ammonium acetate. The coloring solution with certain volume was treated with NH4F-EDTA solution for fading and used as blank. Then the content of titanium (0.010%-0.30%) in high-purity ferrosilicon was determined. The content of phosphorus (0.008%-0.060%) in high-purity ferrosilicon was determined according to national standard GB/T 4333.2-1988 Methods for chemical analysis of ferrosilicon-The reduced molybdobismuthylphosphoric acid photometric method for the determination of phosphorus content. The detection limits of elements were in range of 0.00049%-0.0023%. The content of aluminum, titanium and phosphorus in three standard samples of ferrosilicon was analyzed according to the experimental method, and the found results were consistent with the certified values. The relative standard deviations (RSD, n=6) were between 0.022% and 0.073%.
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