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Xiaotang H.,Sino Platinum Metals Resources Yimen Co. | Xilong W.,Sino Platinum Metals Resources Yimen Co. | Huan W.,Sino Platinum Metals Resources Yimen Co. | Izatt S.R.,IBC Advanced Technologies Inc. | Bruening R.L.,IBC Advanced Technologies Inc.
40th International Precious Metals Institute Annual Conference, IPMI 2016 | Year: 2016

There is rapid growth in the global use of automotive catalytic converters. This growth is fueled by increasing affluence of a growing world population, especially in developing countries, and implementation worldwide of stricter regulations governing toxic emissions from vehicles using fossil fuels. The palladium, platinum, and rhodium used in the catalytic converters become a potential 'urban mine' when the vehicles come to their end-of-life state. Molecular Recognition Technology (MRT) SuperLig® products provide a tested green chemistry method for the selective recovery of these valuable precious metal resources from spent automotive catalysts. A description is given of the processing of spent automotive catalysts in China using MRT.


Shi Y.-F.,Yunnan Copper Co. | Zheng W.-Y.,Yunnan Copper Co. | Fang Y.,Yunnan Copper Co. | Li J.,Yunnan Copper Co. | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2015

After 0.20 g of sample was transferred into high-aluminum crucible, the crucible was put into muffle furnace at 250℃ for 30 min to remove sulfur and arsenic. Then, 3.5 g of sodium peroxide was added, and they were fused at 730℃ for 7 min. The melt was leached with water, and the solution was heated to slight boiling for about 5 min to accelerate the complete decomposition of hydrogen peroxide generated from sodium peroxide. Then, the solution was diluted to the constant volume followed by filtration. One drop of paranitrophenol solution was added and hydrochloric acid (1+6) was dripped into solution until the yellow color just disappeared (pH≈1). The solution was diluted to 20 mL. Then, 5 mL of 400 g/L citric acid solution, 5 mL of hydrochloric acid (1+6), 5 mL of 10 g/L dimethylglyoxime ethanol solution and 5 mL of 250 g/L stannous chloride solution were added for coloring. Consequently, a method was established for determination of rhenium in rhenium-rich slag by dimethylglyoxime spectrophotometry. The experiments showed that Beer's law was obeyed for rhenium in mass fraction range of 100-600 μg/100 mL with absorbance. The detection limit of method was 11.3 μg/mL. The interference test indicated that the coexisting ions in sample had no interference with the determination. The proposed method was applied to the determination of rhenium in two rhenium-rich slag control samples and two actual samples. The results were basically consistent with the reference values. The relative standard deviations (RSD, n=22) were in range of 0.69%-1.1%, and the recoveries were between 99% and 100%. © 2015, Central Iron and Steel Research Institute. All right reserved.


Zheng W.-Y.,Yunnan Copper Co. | Li J.,Yunnan Copper Co. | Fang Y.,Yunnan Copper Co. | Wang C.-F.,Yunnan Copper Co. | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2015

EDTA and tartaric acid were added in sample solution to eliminate the interference of coexisting ions, a large number of fluorine ions and sulfuric acid. In alkaline medium at pH 12-13, trichloromethane was added to extract tetraphenylarsonium thioperrhenate complex formed by tetraphenylarsonium chloride hydrochloride and rhenium(VII). Then, hydrochloric acid (1+1) was used to re-extracted rhenium(VII). Stannous chloride was added for reducing rhenium(VII) to rhenium(II), and potassium thiocyanate was added to react with rhenium(II) to form potassium thiocyanate-rhenium(II) orange yellow complex. Ethyl acetate was added to extract this complex and the solution was diluted to constant volume. Thus, a method was established for determination of rhenium in smelting waste acid of copper concentrate by potassium thiocyanate spectrophotometry. The results showed that the Beer's law was obeyed for rhenium in range of 0-50 μg/10 mL in 6 mol/L hydrochloric acid at wavelength of 430 nm. The correlation coefficient (R2) was 1.0000. The detection limit of method was 1.59×10-6 μg/mL. The proposed method was applied to the determination of rhenium ranged from 4.0 to 16.0 mg/L in the synthetic samples of smelting waste acid of copper concentrate, and the results were consistent with the theoretical values. When the proposed method was applied to determine actual samples, the relative standard deviation (RSD, n=22) was 0.72%-2.2%, and the recoveries were between 99.8%-100%. ©, 2015, Central Iron and Steel Research Institute. All right reserved.


Zhou Y.,Yunnan Copper Co. | Tan Y.-S.,Yunnan Copper Co. | Zhu L.-Y.,Yunnan Copper Co. | Zhu L.-Y.,Sino Platinum Metals Resources Yimen Co. | And 5 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2012

In a high-alumina crucible, sample was fused at 700°C with sodium peroxide for 5-10 minutes, then the content of molybdenum in molybdenum concentrate and molybdenum calcine was determined by ammonium thiocyanate differential spectrophotometry. The conditions for sample fusion, sample solution preparation and determination were optimized. The interference of MnO 4 2- was eliminated by addition of absolute ethyl alcohol, and the impact of tungsten (VI), chromium (VI), vanadium (V) and other coexisting ions was eliminated by precipitation adsorption with ferric trichloride solution and sodium tartrate masking. The results showed that at the absorption wavelength of 480 nm, the mass concentration of molybdenum conformed to Beer's law within the range of 14.0 to 26.0 μg/mL, and the detection limit was 4.2×10 -2 μg/mL. This method has been used for the determination of molybdenum in molybdenum concentrate run samples GKY-01, the production samples of molybdenum concentrate and molybdenum calcine. It was found that the results were in accordance with the reference values or those obtained by gravimetric method, and the relative standard deviations (RSDs, n=11) were 0.10 %-0.14%.


Zhou Y.,Yunnan Copper Co. | Tan Y.-S.,Yunnan Copper Co. | Zhu L.-Y.,Yunnan Copper Co. | Zhu L.-Y.,Sino Platinum Metals Resources Yi Men Co. | And 6 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2013

A method for selective determination of rhenium in raw potassium rhenate containing molybdenum was proposed by thiourea-rhenium(II)-stannous chloride spectrophotometry after masking molybdenum with hydroxylamine hydrochloride-molybdenum (V)-EDTA complex.The conditions for masking molybdenum with hydroxylamine hydrochloride-molybdenum (V)-EDTA and the coloring conditions for thiourea-rhenium (II)-stannous chloride were optimized. The results showed that, in weak hydrochloric acid, 3.0 mg of molybdenum could be masked with 4 mL of EDTA solution and 3 mL of hydroxylamine hydrochloride solution in water bath at 80°C for 35 min. Moreover, the complexation masking system had no influence on the coloring complex. In 3.0 mol/L hydrochloric acid medium, the Beer's law was obeyed for mass concentration of rhenium in range of 0-20 μg/mL at λ440 nm. The detection limit was 1.91×10-8 μg/mL. The proposed method was applied to the determination of rhenium (10%-20%) in raw potassium rhenate sample containing molybdenum (40%-50%). The relative standard deviation (RSD, n=7) was 0.15%-0.25%, and the recoveries were 100%.


Liu W.,Sino Platinum Metals Resources Yimen Co. | Liu W.,Sino Platinum Metals Co. | Li Y.,Sino Platinum Metals Resources Yimen Co. | Li Y.,Sino Platinum Metals Co. | And 11 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2014

According to the principle of metallurgical refining of rhodium, a method for the determination of rhodium in rhodium nitrate products by hydrogen reduction gravimetry was established. The conditions for the determination of rhodium were investigated and optimized. The effect of impurities on the determination results of rhodium was also tested. It was found that, in the medium of 0.3-0.9 mol/L HNO3, rhodium nitrate and ammonium chloride formed a red (NH4)3RhCl6 crystal complex in which rhodium could be determined by gravimetry after a series of treatment: firstly, it was dried at 100℃; then, ammonium salt in it was decomposed at 350℃; lastly, the obtained matter was reduced into rhodium sponge by hydrogen at 750℃ and dried at 105℃. The method was employed to determine rhodium of 6.55%, 7.36%, 8.05%, 9.99% and 20.05%, in rhodium nitrate with the range (R) of ±0.01%, the standard deviation (SD) of 0.0041% and the relative standard deviation(RSD,n=22) of 0.02%-0.06%. The accuracy and precision of this method were higher than YS/T 594-2006 standard method.


Tan W.-J.,Sino Platinum Metals Resources Yimen Co. | Zheng Y.,Sino Platinum Metals Resources Yimen Co. | He X.-T.,Sino Platinum Metals Resources Yimen Co. | Xiao X.,Sino Platinum Metals Resources Yimen Co. | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2016

The sample was fused with sodium peroxide at high temperature. Then, the platinum and palladium were enriched by stannous chloride reduction and tellurium coprecipitation in 3.0-4.5 mol/L hydrochloric acid medium. Pt 265.945 nm and Pd 340.458 nm were selected as the analytical lines. The determination method of platinum and palladium in insoluble slag of waste catalyst for petrochemical industry by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. When the mass concentration of platinum and palladium in sample was in range of 2-27 μg/mL and 0.7-20 μg/mL, the linear equation of calibration curves was IPt=3624×ρPt-180.4 and IPd=9 869×ρPd-220.9, respectively. The linear correlation coefficients (R2) were both 0.99998. The detection limit of platinum and palladium in this method was 0.017 μg/mL and 0.0042 μg/mL, respectively. The content of platinum (109-1342 g/t) and palladium (37-977 g/t) in insoluble slag of waste catalyst for petrochemical industry was determined according to the experimental method. The relative standard deviation (RSD, n=5-11) was 1.1%-1.9% and 1.1%-3.6%, respectively. The determination results were consistent with those obtained by fire assaying enrichment-inductively coupled plasma atomic emission spectrometry. The recoveries of platinum and palladium were 99%-100% and 100%, respectively. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.

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