Abstract：:An experimental setup was self-designed, anda determination method of aluminum and iron in steel grit aluminum was established with the application of gravimetry and titration.The steel grit aluminum sample was placed in stainless steel leaking basin, which was then put on the stainless steel tray. The whole setup was placed in muffle furnace to melt most of metallic aluminum by heating at 800 ℃ for 15-30 min. The aluminum liquid flew through the circular holes on bottom of basin into the tray. The mass of solidified aluminum was weighed. The stainless steel leaking basin with residual mixture was leached in polyethylene plastic pot with the saturated sodium hydroxide solution for reaction. After reaction, the mass of steel grit in leaking basin was dried and weighed, which was the mass of metallic iron in samples. The leaching solution was diluted into constant volume, and filtrated with slow speed filter paper. Certain volume of filtrate was accurately sampled. After adding excessive EDTA standard solution, the pH of solution was adjusted to 5-6. The content of aluminum in filtrate was titrated with copper nitrate standard solution in acetic acid-ammonium acetate buffer solution with PAN as indicator. The total mass of aluminum in sample was obtained by adding the mass of solidified aluminum in sample fusion process to the mass of aluminum in the filtrate. The parallel determinations of steel grit aluminum samples by the experimental method were conducted. The relative standard deviation (RSD, n=5) of aluminum and iron was 4.1% and 10.9%, respectively. The recoveries for aluminum and iron in self-made steel grit aluminum samples were between 99.5% and 100.0%. The proposed method was applied to the determination of three steel grit aluminum samples, and the results were consistent with the reference values.
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