Abstract:Aiming at the interference of elements such as Pb, Bi, Pd, Cu and Te in thedetermination of silver in copper anode slime by lead assay gravimetric method, a method for the determination of silver in copper anode slime by lead assay with precious metal-potassium thiocyanate titration was established. The representative copper anode slime with high silver grade was selected as the sample. The silicic acidity of slag K=1.5, the temperature was raised from 900 to 1100 C for 40 min and the melting time was kept for 30 min. The magnesia ash dish was used for ash blowing at 920 C at the speed of 1.0 g/min lead metal. After the ash blowing, the temperature was immediately lowered to 650 C, and the obtained composite particles were titrated silver directly by KSCN after nitric acid dissolution. Under the optimized conditions, the silver grade of average values was 86.31 kg/t (n=4), RSD=0.42%, and the recovery was 98.85%~99.52% ，RSD=0.28% respectally. The method can effectively eliminate the influence of elements such as Pb, Bi, Pd, Cu and Te on the determination of silver and improve the accuracy of detecting silver grade in copper anode slime.