Time filter

Source Type

Fan F.,National Engineering Laboratory for Vacuum Metallurgy | Fan F.,Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province | Fan F.,Kunming University of Science and Technology | Xu B.,National Engineering Laboratory for Vacuum Metallurgy | And 14 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2012

We addressed the feasibility of lithium extraction from lithium oxide, decomposed of lithium carbonate, in vacuum. First, the decomposition of lithium carbonate and iron reduction of lithium oxide, in vacuum and in atmospheric pressure, respectively, were theoretically calculated on the basis of thermodynamics. The calculated results show that lithium carbonate, impossible to break up in atmospheric pressure, can be decomposed at 1 Pa and a critical temperature of 889 K, and that it is feasible to reduce lithium oxide with iron in vacuum. Next, the lithium oxide was experimentally reduced in vacuum with iron powder as the reduction agent. The tested results show that under optimized conditions: at a pressure ranging from 1 to 5 Pa, and a temperature from 1423 to 1573 K, it is feasible to extract metallic lithium from lithium oxide at a reduction rate over 48%. Finally, possible improvement of the technique was tentatively discussed.


Qu T.,National Engineering Laboratory for Vacuum Metallurgy | Qu T.,Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province | Qu T.,Kunming University of Science and Technology | Qu T.,State Key Laboratory Breed Base Of Complex Nonferrous Metal Rsrc Clear Utilization In Yunnan Province | And 20 more authors.
Magnesium Technology | Year: 2012

The overall utilization of magnesium and other metals should be systematically considered during the exploration of deficient garnierite.In this paper the thermodynamic analysis of the carbothermic reduction process for extracting metal magnesium from garnierite in vacuum was carried out to investigate its feasibility.The calculation results indicate that it is feasible technically that the carbothermic reduction process for extracting metal magnesium from garnierite in vacuum. Under the temperature of 1500°C and vacuum degree is less than 300Pa, metal magnesium was obtained. The Nickel content in residue is more than twice as garnierite ore.


Wang Y.,National Engineering Laboratory for Vacuum Metallurgy | Wang Y.,Kunming University of Science and Technology | Wang Y.,Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province | Tian Y.,National Engineering Laboratory for Vacuum Metallurgy | And 17 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2013

We addressed the possible mechanisms responsible for extraction of Mg from the calcined dolomite by carbothermic reduction in vacuum. According to thermodynamics calculation, at a pressure in the 30~100 Pa range and at 1573 K, Mg vapor forms because of the reaction of C and MgO; at 1667 K, the CaC2 emerges, due to the reaction of C and CaO, and effectively reduces MgO to produce Mg vapor, accompanied by the direct reduction of MgO by C. In addition, several compds, including 3Cao · SiO2, 2CaO · SiO2, SiC and CaS, were found to co-exist. The sulfur and sulfate impurities in coal participate in the CaS formation. The resultants and slag were characterized with X-ray diffraction. The XRD spectra agreed fairly well with the calculated results. A tiny fraction of MgO, found in the Mg condensate, possibly originated from the reverse reaction of CO and Mg vapor, there.


Yuan H.,Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province | Yuan H.,Kunming University of Science and Technology | Zhu F.,Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province | Zhu F.,Kunming University of Science and Technology | And 4 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2010

Aluminum was produced by alumina carbothermic reduction-chlorination in vacuum. The impacts of the experimental conditions, including the temperature of alumina carbothermic reduction, sublimation rate of anhydrous-AlCl3, molar ratio of the reagents, carbothermic and chlorination times, and additive species, on the Al production were experimentally studied. The direct Al collection rate and reagent loss rate were evaluated. The microstructures of Al obtained was characterized with X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The results show that the vacuum melting conditions of Al, optimized in this study, were feasible for industrial production. Moreover, under the optimized conditions, the influence of various additives, such as Fe2O3, SiO2 and TiO2, on the rates of direct Al collection and reagent loss were tentatively evaluated. For example, addition of 10.0% Fe2O3 or TiO2 with a 4:1 molar ratio of C and Al2O3 at 1713~1763 K resulted in Al collection rates of 72.9%, and 82.38%, respectively.


Wang Y.C.,National Engineering Laboratory for Vacuum Metallurgy | Wang Y.C.,Kunming University of Science and Technology | Wang Y.C.,Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province | Tian Y.,National Engineering Laboratory for Vacuum Metallurgy | And 12 more authors.
Materials Science Forum | Year: 2014

Based on thermodynamic analysis, the degree of the separation between magnesium and impurities under vacuum was estimated in this paper. It demonstrated that it may be feasible to purify crude magnesium by vacuum distillation on experimental scale. The high purity (99.98% or 3N8, mass fraction) magnesium (Mg) was obtained through vacuum distillation using 96% Mg as a raw material under 15 Pa. The inductively coupled plasma atomic emission spectroscopy (ICP-AES) was applied for the analysis of the raw material and the distilled magnesium for 6 impurity elements. The results indicated that the low-volatile impurities such as Fe, Cu, Mn, Pb, Ca could be reduced at the stage of 873K for 30min and the reduction of total impurity content from 34600 ppm (1N6) for crude magnesium to 180ppm (3N8) upon condensate. In conclusion, purification of magnesium was carried out in an efficient high-yield vacuum distillation system designed and fabricated for purifying 1N6 indigenous magnesium to 3N8 (99.98%). © (2014) Trans Tech Publications, Switzerland.

Loading Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province collaborators
Loading Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province collaborators