Abstract：Arsenopyrite, as the main arsenic mineral, is often closely associated with pyrite which is mainly in pyrite. During the beneficiation of mineral deposits associated with arsenopyrite and pyrite, the level of arsenic content in pyrite seriously affects the grade and application of pyrite. In experiments, the sample was dissolved in nitric acid-potassium chlorate saturated solution. A certain amount of sulfuric acid was added to remove the nitric acid by heating until the concentrated white smoke appeared. Then, sodium hypophosphite was used to reduce As5+ to As0 (elemental arsenic) using copper sulfate as catalyst in hydrochloric acid medium. After a certain water bath time and the elemental arsenic precipitation time, the arsenic was separated from other impurities by filtration. As0 was dissolved with excess potassium dichromate standard titration solution, and the excessive potassium dichromate standard titration solution was titrated with ammonium ferrous sulfate standard titration solution. Therefore, the content of high arsenic content (1%-10%) in pyrite could be accurately determined. The proposed method was applied to the determination of arsenic in two samples of pyrite, and the relative standard deviation (RSD, n=9) of measurement results was 0.78% and 0.51%, respectively. Which were consistent with the analysis results by iodimetry. This method avoided the use of highly toxic agent, i.e., arsenic trioxide, for the determination of high arsenic content in pyrite.
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