Abstract:Abstract: Acid digestion is the most ideal detection method for the determination of copper in copper concentrate, and hydrochloric acid and nitric acid are commonly used to treat it. However, for some insoluble copper-containing material samples, there is always black residue that cannot be treated in the later stage of dissolution, and adding saturated ammonium fluoride after adjusting acidity before titration will produce dark purple flocculent precipitation, which will seriously affect the titration analysis, resulting in large deviation and inaccurate analysis results. In this research method, copper-containing materials were dissolved by acid dissolution, insoluble materials were filtered and separated, and the residue was analyzed and corrected. The conditions such as the amount of hydrofluoric acid and the amount of nitric acid used in the dissolution of filtered filter residue were optimized by experiments, and the final experimental method was established. The determination results were consistent with the results of laboratory outsourcing, and the relative standard deviation (RSD) was 0.06% ~0.16%, which showed that this method was accurate, rapid and rapid for the determination of copper content in copper materials.