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Li J.,Kunming University of Science and Technology | Zhao H.,Yunnan Chemical Research Institute | Qu G.,Kunming University of Science and Technology | Gu J.,Kunming University of Science and Technology | Ning P.,Kunming University of Science and Technology
Materials Science Forum | Year: 2013

In order to developing high-value-added products and making full use of phosphate resources, Lithium Iron Phosphate were synthesized in the controlled atmosphere, using electronic grade phosphoric acid from Yunnan province, ferrous oxalate and Lithium carbonate by microwave processing. The variety of particles and distribution in different conditions of the mixing and grinding, the influence of appearance and property of the Lithium Iron Phosphate in different conditions of microwave power, microwave time and reaction temperature were discussed. Based on the experiment the optimized process conditions have been obtained. Some of the samples were characterized by XRD, SEM, electric capacity, chemical analysis, cycle performance and phase analysis. The experimental results show that the microwave synthesis method of Lithium Ferrous Phosphate is feasible. © (2013) Trans Tech Publications, Switzerland.


Zou C.J.,Southwest Petroleum University | Tang Q.W.,Southwest Petroleum University | Lan G.H.,Southwest Petroleum University | Tian Q.,Yunnan Chemical Research Institute | Wang T.Y.,Petrochina
Journal of Inclusion Phenomena and Macrocyclic Chemistry | Year: 2013

For the first time, hydroxypropyl-β-cyclodextrin (HP-β-CD) has been brought in to include 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) in order to enhance inhibition efficiency of PBTCA, which leads a new approach to study oil-gas field corrosion inhibition in the process of acid treatment. Based on the host-guest inclusion reaction, the inclusion complex of PBTCA with HP-β-CD has been prepared in the laboratory. UV-Vis absorption spectrum was applied to study the inclusion behavior of PBTCA with HP-β-CD. The results revealed that PBTCA with HP-β-CD can form a 1:1 stoichiometry inclusion complex. The 1:1 inclusion complex synthesized by using lyophilization was further characterized by Fourier transform infrared spectroscopy. Besides, inhibition effect of the inclusion complex on the corrosion inhibition of Q235 carbon steel has been investigated in 0.1 M sulfuric acid (H2SO 4) solution using potentiodynamic polarization, electrochemical impedance spectroscopy techniques and scanning electron microscopy (SEM). It was found that the presence of the inclusion complex better achieved the anti-corrosion property in aggressive medium than was the case with alone PBTCA and the highest inhibition efficiency of the inclusion complex over 90 % was obtained, which are suggestive of the active effect of the inclusion complex for improving inhibition efficiency of PBTCA. Meanwhile, the results obtained from SEM further showed that the inclusion complex acts as a more efficient corrosion inhibitor for Q235 carbon steel in H2SO4 medium. © 2012 Springer Science+Business Media B.V.


Li G.,Kunming University of Science and Technology | Zhou L.,Kunming University of Science and Technology | Zha Z.,Yunnan Chemical Research Institute | Su Y.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2013

Polydichlorophazene is a colloidal ivory inorganic polymer with high elastic and an important intermediate that synthetizes polyphosphazene derivatives. By means of substituting the chloridion on polydichlorophazene by nucleophilic group, new functional materials with various different performance are fromed. The paper present research progress of synthetizing polydichlorophazene methods which are consist of two steps: the first step is synthesis of hexachlorocyclotriphosphazene, the second step is synthesis of polydichlorophazene. © (2013) Trans Tech Publications, Switzerland.


Ma Y.-L.,Kunming University of Science and Technology | Su Y.,Kunming University of Science and Technology | Kang X.-Y.,Kunming University of Science and Technology | Zha Z.-T.,Yunnan Chemical Research Institute
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2011

With yellow phosphorus slag as the raw material and nitric acid as leaching agent, SiO2 was separated from the yellow phosphorus slag in the form of amorphous hydrated silicon dioxide. The calcium was entered into leaching liquor in the form of calcium nitrate, which was precipitated with sulphuric acid, and the high quality calcium sulfate product was obtained after washing and drying. The influence of the factors like mass concentration of sulphuric acid, the volume ratio of H2SO4 to Ca(NO3)2, the stirring speed and the reaction temperature on the product quality of calcium sulfate was discussed. The characterization of the surface structure of calcium sulfate was performed by FTIR, TG-DTA and XRD. The result shows that the mass fraction of CaSO4 in the product can reach 99.66%, and the mass fraction of H2O is 19.43%, which was analyzed to be the product of CaSO4 · 2H2O by FTIR, TG-DTA and XRD. The optimum technical conditions are as follows: H2SO4 mass fraction 20%, the volume ratio of H2SO4 to Ca(NO3)2 0.6 :1, stirring speed 200 r/min, reaction time 30 min.


Li G.-B.,Kunming University of Science and Technology | Zha Z.-T.,Yunnan Chemical Research Institute | Ma Y.-L.,Kunming University of Science and Technology | Su Y.,Kunming University of Science and Technology
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2011

Yellow phosphorus slag is a solid waste produced in yellow phosphorus production by electrical furnace reduction from phosphate ore, silex and coke at high temperature of 1 400-1 600°C. It has high reactivity, contains a lot of silicon and calcium compounds, and can be applied to the production of valuable products. When yellow phosphorus slag is leached by phosphoric acid, hydrated silica and soluble calcium salt are produced, thus calcium and silicon are separated. The potential-pH diagram of the Ca-P-H2O system at 298.15 K was obtained on the basis of thermodynamic calculation. The results show that the terminal controlled pH of lixivium should be less than 1.39 to make calcium element into the leaching solution, when yellow phosphorus slag is leached with phosphoric acid and the concentration of both calcium ion and phosphoric acid in leaching solution is 1.00 mol/L. The lixivium has lots of calcium element and phosphoric acid or dihydrogen phosphate root, and can be used to produce calcium dihydrogen phosphate, calcium hydrophosphate or tricalcium phosphate by the further neutralization in right pH conditions of the system.

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