Abstract：During the determination of antimony in gold concentrate containing antimony by cerium sulfate titrimetry with methyl orange as indicator, the endpoint color would be seriously interfered by the color of Fe (III) in solution when the content of iron in sample was high. As a result, the endpoint was hardly judged. It was found that the interference of Fe (III) on titration endpoint could be effectively eliminated with methylene blue-methyl orange as indicator, and the color change at endpoint was obvious. In view of the above, after the sample was dissolved with sulfuric acid and potassium sulfate, Sb (V) in solution was reduced to Sb (III) with sodium sulfide, and the solution was heated to 70~90 ℃ in hydrochloric acid medium, then a determination method of antimony in gold concentrate containing antimony was established by cerium sulfate titrimetry with methylene blue-methyl orange as indicator. The proposed method was applied to the precision and recovery tests of actual samples of gold concentrate containing antimony. The relative standard deviation (RSD, n=8) was less than 4%, and the recoveries were between 99% and 102%. The content of antimony in actual sample of gold concentrate containing antimony was determined according to the experimental method. The results were consistent with those obtained by national standard method GB/T 15925-2010.
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