Abstract：The copper content directly determines the value of copper concentrate, so the accurate determination of copper content is particularly important. The sample was digested by wet method with hydrochloric acid, nitric acid, bromine and sulfuric acid. Silicon and carbon was removed with ammonium hydrogen fluoride and perchloric acid, respectively. The sample was further digested by sulfuric acid fuming at high temperature, realizing the determination of copper in copper concentrate by photometric titration. The measurement wavelength, stirring method, addition rate and buffer solution were optimized. The experimental conditions were obtained as follows: the measurement wavelength was 520nm; the stirring method was mechanical stirring using stirring paddle; the addition rate was controlled at 0.40mL/4s; the buffer solution was acetic acid-sodium acetate solution (pH5). The experiment showed that thevolume correction was not required in measurement if E(voltage)-V(volume) titration curve was used for quantitation, and the titration end point could be automatically calculated by the instrument. The end point could be automaticallyjudged by the sudden change of potential. It was no need to correct the actual potential of testing solution, which simplified the operation procedures. The interference tests of coexisting elements in sample showed that the interference of iron could be eliminated by slowly adding 0.5mL of 200mg/mL potassium fluoride solution before titration. Other coexisting elements in sample had no interference with the determination. The contents of copper in certified reference materials and actual samples of copper concentrate were determined according to the experimental method. It indicated that the results were basically consistent with the certified values or those obtained by standard method (GB/T 3884.1-2012). The relative standard deviations (RSD, n=12) of determination results were between 0.11% and 0.52%. The proposed method could meet the detection requirements of copper concentrate with copper content in the range of 9.5%-65.0% (mass fraction).
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