Study on enrichment method of platinum, palladium and rhodium in spent auto-catalysts
YOU Gang1, 2, FANG Wei*1, 2, LI Qing1, 2, MA Yuan1, 2, YANG Xiao-tao1, 2, YANG Hui1, 2
1.Kunming Institute of Precious Metals,State Key Laboratory of Advanced Technology of Comprehensive Utilization of Platinum Metals, Kunming 650106, China; 2.Sino-Platinum Metals Testing Technology (Yunnan)Co.,Ltd., Kunming 650106, China
Abstract：The enrichment method of platinum, palladium and rhodium in spent auto-catalysts by sulfur-nickel assaying method was studied. The formula of small-scale sulfur-nickel assaying for the pretreatment of spent auto-catalyst samples was discussed. The influence of smelting temperature, smelting time, silicon acidity, dosage of nickel powder trapping agent, the mass ratio of sulfur and nickel, the dosage and ratio of flux on the pretreatment of sample was investigated by orthogonal experiment and control variable methods. The optimal assaying formula was obtained: the smelting temperature was 1 050 ℃, the smelting time was 30 min, the silicon acidity was K=3.5, the dosage of nickel was 0.88 g, the mass ratio of sulfur and nickel was m(Ni)∶m(S)=0.9∶1, and the dosage of flux was 4 g (m(Na2CO3)∶m(Na2B4O7) = 1∶2). The content of platinum, palladium and rhodium in spent auto-catalysts was determined by sulfur-nickel assaying - tellurium coprecipitation - inductively coupled plasma atomic emission spectrometry(ICP-AES). The detection limit of platinum, palladium and rhodium in this method was 0.008 9 μg/mL, 0.005 1 μg/mL and 0.002 4 μg/mL, respectively. The platinum, palladium and rhodium in actual samples (RM-1, RM-2 and RM-3; internal quality control samples in enterprise) and certified reference material (GYBW-CHJ-1) was determined according to the experimental method. The relative standard deviations (RSD, n=6) were between 0.14% and 2.7%. The found results were consistent with the reference/certified values.
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