H.Tong
,
Y.G. Wang
,
J.H. Lei
,
D.Q. Li
,
P. Tang
金属学报(英文版)
Mass transfer and extraction kinetics of yttrium with the purified Cyanex 923 in nheptane from nitrate medium have been investigated by using a constant interfacial cell with laminar flow at 298 K. The interfacial adsorption properties of purified Cyaner 923-heptane-0.2 mol/L (H,Na)NO3 were studied at 298 K. The experimental results show that the mass transfer is controlled by diffusion and the chemical reactions are carried out in the interfacial zone. The extraction rates of yttrium were measured at different chemical compositions by varying ionic strength, pH valused and the purified Cyane 923 concentrations. the initial extraction rate equations were obtained.
关键词:
yttrium
,
null
,
null
,
null
J. Tao
,
D.Q. Li
,
C.L. Fan
,
H.Y. Fang
金属学报(英文版)
The manual selection of environment parameters during welding simulation will bring a significant error to the simulation result of welding temperature field. By a combination of finite element method (FEM) and infrared thermography, these environment parameters were inversed mathematically in place of previous manual selection. First, FEM model of the welding process was constructed, and the temperature field was computed with initial environment parameters. Then, a real welding process was conducted and the temperature field was measured by infrared thermography. Last, the simulation and measurement results were compared, and the environment parameters were adjusted continuously with the genetic algorithm (GA) until the simulation matched the measurement best. Parameters according to the best-matched simulation results were considered as the most appropriate parameters.
关键词:
environment parameters
,
null
,
null
W.P. Liao
,
G.H. Yu
,
D.Q. Li
金属学报(英文版)
The extraction equilibrium of cerium(IV) and fiuoriue(l) from II2SO4 solution tyCyanex 923 was studied. The extraction mechanism of Ce(IV) and F(I) by Cyanex923 was determined by the method of slope analysis. The results showed that Cyane923 can extract HF as HF.L and Ce4+ together with HF as Ce(HF)(HSO4)2(SO4).2Lby which HF comes into the organic phase mainly when there is Ce4+ in the solution,where L is the extractant. Temperature did not affect the extraction. The IR spectraof purified Cyanex 923 saturated with Ce(IV) and HF were discussed.``
关键词:
solvent extraction
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null
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null
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