Abstract：The chlorine removing copper slag was an important material to produce copper sulfate or remove chlorine after regeneration. The content of chlorine in chlorine removing copper slag must be determined to guarantee its quality. The chlorine in this slag mainly existed in the form of indissolvable CuCl. The sample was treated by argentometry in this study to guarantee the complete dissolution and nonvolatilization of Cl- in sample preparation process. Then, the content of chlorine in chlorine removing copper slag was indirectly determined by automatic potentiometric titration. In this method, the quantitative excessive AgNO3 standard solution was firstly added into sample. When nitric acid (1+3) was added, Cl- in solution would immediately react with Ag+ to form AgCl colloid. The solution was heated and boiled for rapid agglomeration and complete precipitation of AgCl colloid. After cooling and dilution to constant volume, the solution went through dry filtration. The filtrate was sampled quantitatively. Then, the quantitative excessive Cl-standard solution was added. The solution was boiled for complete precipitation of AgCl. The residual Cl-content in filtrate was determined by automatic potentiometric titration. Therefore, the content of chlorine in chlorineremoving copper slag could be indirectly calculated. The impurities in sample solution including F-, SO42-, Na+, Cu, Zn2+, Cd2+, Mg2+, Fe3+and As had no interference with the determination. The proposed method was applied to the determination of chlorine content in four chlorineremoving copper slag samples. The results were consistent with those obtained by indirect flame atomic absorption spectrometry. The relative standard deviation (RSD, n=5) was 0.75%-2.6%, and the recoveries were between 99% and 101%.
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