An Z.-Q.,Kunming Metallurgy Research Institute |
Zhao D.-P.,Kunming Metallurgy Research Institute |
Fang H.-Y.,Sino Platinum Metals Co. |
Liu W.-L.,Kunming Metallurgy Research Institute |
And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2016
The industrial silicon sample was dissolved with hydrofluoric acid and nitric acid. After removing silicon and fluorine by perchloric acid fuming, ascorbic acid and the color developing solution were added successively for coloring followed by direct determination. Thus, an analysis method of phosphorus content (0.001%-0.27%) in industrial silicon by phosphomolybdenum blue spectrophotometry was established. The results showed that Beer's law was obeyed for mass concentration of phosphorus in range of 0.05-1.40 μg/ mL. The detection limit of method was 0.000 46 μg/mL. The apparent molar absorptivity was ε825=2.75×104 L·mol-1·cm-1. Other coexisting ions in sample had no interference. The content of phosphorus in three industrial silicon industry reference materials was determined according to the experimental method in different laboratories, and the results were consistent with the certified values. The content of phosphorus in two industrial silicon industry reference materials was determined according to the experimental method, and the results were both consistent with those obtained by national standard methods GB/T 14819.4-2012 and GB/T 14819.5-2012. The proposed method was applied to the determination of phosphorus (0.001%-0.27%) in industry reference materials and actual samples of industrial silicon. The relative standard deviations (RSD, n=22) were between 1.4% and 4.5%. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.
Li Y.,Kunming Institute of Precious Metals |
Li Y.,Sino Platinum Metals Co. |
Wang J.-k.,Yunnan Metallurgy Group Co. |
Wei C.,Kunming University of Science and Technology |
And 3 more authors.
Minerals Engineering | Year: 2010
Low-grade complex Pb-Zn oxide ore is an important source, and the reserve is very great in the world. It is very difficult to obtain Pb and Zn from the source by traditional technology. In this work, a new technology characterized by sulfidation of low grade Pb-Zn oxide ore with elemental sulfur was developed. The effects of temperature, time, particle size and sulfur amount on the sulfidation extent of Pb-Zn oxide ore was studied at a laboratory-scale. The experimental results show that the sulfidation extent of Pb and Zn oxide reaches 98% and 95% under the optimum conditions, respectively. A flotation concentrate was obtained with 38.9% Zn and 10.2% Pb from the materials which was treated by sulfidation, and the recovery of Zn and Pb is 88.2% and 79.5%, respectively. Crown Copyright © 2010.
Xing W.,Kunming Institute of Precious Metals |
Fan X.,Kunming Institute of Precious Metals |
Fan X.,Sino Platinum Metals Co. |
Fan X.,Platinum Technology |
And 6 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2014
The kinetics behavior of nickel and cobalt leaching from waste superalloys with sulfuric acid was investigated. The kinetics experiments were carried out with the ratio of liquid to solid of 400:1, the acid concentration of from 10% to 25%(volume fraction) and the temperature of from 55 to 75℃. The results showed that the apparent activation energy of nickel and cobalt was 13.37 and 21.59 kJ·mol-1, respectively. This indicated that the dissolution kinetics followed a shrinking core model with inter-diffusion of nickel, cobalt and sulfate ions through the porous region of alloying layer in the rate determining step. The kinetics study of leaching Ni and Co from waste superalloys with sulfuric acid provided some reference for the recycle of waste superalloy in industry practice.
Liu Y.,Sino Platinum Metals Co. |
Liu Y.,Kunming Institute of Precious Metals |
Jiang G.,Kunming Institute of Precious Metals |
Xu K.,Sino Platinum Metals Co. |
And 3 more authors.
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2015
In recent years, there have been great efforts focused on joining ceramics to metals to establish processes for a wide range of industrial uses. Several important problems, however, still remain unsolved. Among them, how to produce atomic bonds at ceramic/metal interfaces and how to minimize the residual stress due to large thermal expansion mismatch between two constituents are the most critical. The thermal expansion mismatch effect is a serious problem because, even if a strong interface could be achieved, joints with large residual stress are easily broken. Therefore, it is desirable to reduce the magnitude of the residual stress. Some researchers have succeeded in achieving a strong joint between alumina and stainless steel by using a soft metallic interlayer. In this study, the effects of interlayers of nickel, copper and copper coated with nickel on the microstructure and shear strength of alumina ceramic and 1Cr18Ni9Ti stainless steel bonding with Ag-Cu-Ti filler metal were investigated. The results indicated that, when using copper as an interlayer, sufficient interfacial reaction between the ceramic and the filler metal could obtain. However, when using nickel as an interlayer, resulting in an insufficient reaction between the ceramic and the filler metal and the formation of large amount Ni3Ti intermetallic compounds, and thus, the strength of the joint decreased heavily. It is very interesting that when using copper coated with Ni, the existence of the small amount of nickel didn't affect the activity of titanium in the filler metal, meanwhile, it decreased the effect of the filler metal on the solubility of copper. Compared with copper and Ni interlayer, this interlayer could reduce interfacial residual stress more effectively. And the shear strength of 109 MPa was obtained when the thickness of Cu was 0.2 mm coated with 30 μm thick nickel. © Copyright.
Wang Q.,Kunming Gui Yan Pharmaceutical Co. |
Pu S.,Kunming Gui Yan Pharmaceutical Co. |
Li Y.,Kunming Gui Yan Pharmaceutical Co. |
He J.,Kunming Gui Yan Pharmaceutical Co. |
And 4 more authors.
Advanced Materials Research | Year: 2012
In order to obtain a gallic acid platinum complex, the title compound was synthesed from potassium tetrachloroplatinate by the reaction potassium iodide, (1R,2R)-1,2-cyclohexanediamine, silver nitrate and gallic acid respectively. The complex structure and component were characterized by elemental analysis, ESI-MS, 1H-NMR and IR and the anticancer activity was measured by MTT method. The result showed that its structure was consistent with the title compound and had inhibiting effect on the growth of tumor cell lines in vitro. © (2012) Trans Tech Publications, Switzerland.
Ma L.-W.,Beijing University of Technology |
Dong H.-G.,Sino Platinum Metals Co. |
Xi X.-L.,Beijing University of Technology |
Zhu X.-G.,Beijing University of Technology
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology | Year: 2015
The two-step leaching was studied torecover the valuable metals in waste printed circuit boards (PCBs). Firstly, sulfuric acid with hydrogen peroxide was used to leach the base metal; andsecondly, the aqua regiato leach gold in the base metal. The optimal base metal leaching conditions were as follows: hydrogen peroxide of 20 mL; solid-liquid ratio of 1:5; sulfuric acid concentration of 5 mol/L; reaction temperature of 60 ℃ and reaction time of 90 min. Thedissolution ratio of raw material (10 g) reached 90.0% under the above conditions. The gold leaching efficiency reached 97.5% at 40 ℃ with reaction time of 30 min. Studies have shown that the two-step leaching can effectively deal with PCBs, and the gold dissolution process is controlled by diffusion. ©, 2015, Beijing University of Technology. All right reserved.
Lu S.,Sino platinum Metals Co. |
Wang J.,Sino platinum Metals Co. |
Wang G.,Sino platinum Metals Co. |
Liu S.,Sino platinum Metals Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013
Ag/Cu compound strip was prepared by solid phase compound fabrication at room temperature. Effects of continuous bright annealing process on surface quality and compound interface of the Ag/Cu compound strip were researched by SEM. The results show that when the Ag/Cu compound strip is continuous bright annealed at 700°C with 2.0 m/min tape speed and (50%-75%) H2+N2 annealing atmosphere, the surface is bright, and the bond strength of the compound interface is good, which meets the requirements of subsequent processing.
Zhu Y.,Sino Platinum Metals Co. |
Yang A.,Sino Platinum Metals Co. |
Zhang J.,Sino Platinum Metals Co. |
Deng Z.,Sino Platinum Metals Co. |
And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015
The Au-12Ge alloy was prepared by horizontal continuous casting, and influence of the amount of nitrogen on microstructure and segregation of the alloy ingot was investigated. The results reveal that the dendrites in Au-12Ge is refined to gradually begin to evolve into equiaxed state with the increase of amount of nitrogen to enhance the stirring. The increase of the amount of nitrogen can inhibit segregation of Au-12Ge alloy, and significantly improve the degree of segregation Au-12Ge alloy. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.
Dong H.,Central South University |
Dong H.,Sino platinum Metals Co. |
Jiang T.,Central South University |
Guo Y.,Central South University |
And 2 more authors.
Hydrometallurgy | Year: 2012
A roast-acid leaching process has been developed for upgrading titanium slag with high Ca and Mg to a synthetic rutile. The optimized roasting conditions used a Na 2CO 3 to slag weight ratio of 3:7 at 850 °C-900 °C for 1 h. The roasted product was mainly comprised of sodium titanate, sodium ferrite and Na-Fe-Ti-O and Na-Mg-Ti-O phases. The impurities associated with the roasted product were leached in water and dilute sulfuric acid solution, while the soluble titanium precipitated as hydrated TiO 2. The hydrated TiO 2 was transformed into a synthetic rutile, assaying over 95% TiO 2 and 0.82% MgO + CaO, by calcination. © 2011 Elsevier B.V. All rights reserved.
Lu S.,Sino Platinum Metals Co. |
Yang H.,Yunnan Copper Science and Technology Development Co. |
Yu J.,Sino Platinum Metals Co. |
Mao D.,Sino Platinum Metals Co. |
And 2 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2013
The Ag/Cu composite was prepared by room temperature solid-phase composite technology, the stripping force and the interfacial morphology and component of the Ag/Cu composite were investigated with a tensile tester and the scanning electron microscopy. The results showed that the interfacial stripping force of the Ag/Cu composite increased gradually when the deformation amount improved, when the deformation amount improved 75%, the Ag/Cu composite combined firmly. The composite rolling combination mode was conformed to the crack mechanism.