State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization

Dadukou, China

State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization

Dadukou, China
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Li M.,Southwest Petroleum University | Li M.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Xie D.,Southwest Petroleum University | Guo Z.,Southwest Petroleum University | And 2 more authors.
International Journal of Polymer Science | Year: 2017

A terpolymer comprised of sodium styrene sulfonate (SSS), fumaric acid (FA), and acrylamide (AM) was synthesized by aqueous free radical copolymerization and evaluated as fluid loss additive for oil well cement. The chemical structure and performance of the terpolymer were characterized by Fourier transform infrared (FTIR) spectroscopy and thermal gravimetric analysis (TGA); the molecular weight and its distribution were determined by gel permeation chromatography (GPC). The optimum reaction conditions of polymerization were obtained: a reaction temperature of 50°C, a mass ratio of SSS/FA/AM 4: 2: 14, initiator 0.1%, and reaction time of 4 h; characterization indicated that the SSS/FA/AM had a certain molecular weight and excellent temperature-resistant and salt-resistant properties. The results show that SSS/FA/AM has a good fluid loss performance, in which the API fluid loss of the oil cement slurry could be controlled within 100 mL at 160°C. In addition, it had little effect on the cement compressive strength. The results of scanning electron microscopy (SEM) of the filter cake showed that SSS/FA/AM could be adsorbed on the surface of the cement particles and produce a hydrated layer to prevent fluid loss from the oil well cement. © 2017 Ming Li et al.


Li M.,Southwest Petroleum University | Li M.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Hao J.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Deng S.,Southwest Petroleum University | And 2 more authors.
Magazine of Concrete Research | Year: 2017

Low temperatures affect the development of cement slurry strength in cementing operations, thereby increasing the risks of shallow water/gas channelling and operation costs. Accelerators such as calcium chloride are often used to rapidly improve the mechanical properties of cement. However, accelerators often have negative effects, including decreased cement stone volume, increased permeability and decreased protection against sulfate corrosion. The effects of nanosilica (NS) on the properties of cement slurries were studied at low temperatures. It was found that the early strength of cement slurries was significantly enhanced with the addition of NS. Furthermore, sedimentary stability and the ability to control fluid loss were improved at low temperatures. Mechanistic analysis showed that the early strength improvement was primarily due to the pozzolanic effect of the NS and the bridging and pull-out effects of the AFt (Al2O3-Fe2O3-tri) phase. The use of NS as an accelerator for low-temperature cementing may have broad applications. © 2017, ICE Publishing. All rights reserved.


Xu B.-P.,Pangang Group Co. | Xu B.-P.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization
Yejin Fenxi/Metallurgical Analysis | Year: 2013

In strict accordance with the GB/T6379.2-2004 standard, a number of laboratories were coordinated to conduct precision tests for the determination of TiO2 in iron ore by ferric ammonium sulfate titrimetry. The data consistency and outliers were investigated with Mandel, Cochran, Grubbs and Dixon test methods, and the precision test data underwent statistical calculations with the EXCEL calculation tool to determine the functional relationship of precision for the analytical method. With repeatability r and reproducibility R, the inner-laboratory and inter-laboratory precision of the analytical method were truthfully and objectively reflected.


Wang Y.J.,CAS Chengdu Institute of Biology | Wang Y.J.,Environmental Microbiology Key Laboratory of Sichuan Province | Li D.P.,CAS Chengdu Institute of Biology | Li D.P.,Environmental Microbiology Key Laboratory of Sichuan Province | And 5 more authors.
Journal of Industrial Microbiology and Biotechnology | Year: 2014

Liquid phase oxidation process using chelated iron solution is among the most promising techniques for the hydrogen sulfide removal due to its double advantage of waste minimization and resource recovery. Regeneration of chelated iron is a core reaction in this process. Regeneration of chelated iron in acidic solution is very difficult. In this paper, a novel regeneration of iron citrate in acidic solution by biooxidation of iron-oxidizing bacteria was reported firstly. By using such a process, the influence of iron-oxidizing bacteria on the regeneration rate was investigated. The results demonstrated the regeneration rate with the new technology was increased significantly. The process may contribute to the biooxidation of iron-oxidizing bacteria. Application of this novel process increased the regeneration rate under the optimum conditions, suggesting the iron citrate regeneration process may be a feasible and economical method in application. © 2014, Society for Industrial Microbiology and Biotechnology.


Yan B.-L.,Harbin Engineering University | Yan B.-L.,Pangang Group Co. | Yan B.-L.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Yan Y.-D.,Harbin Engineering University | And 4 more authors.
Electrochimica Acta | Year: 2016

This work presents an electrochemical study of Ti3+ and Al3+ in the NaCl-KCl-AlCl3-Ti2O3 at 1123K. Transient electrochemical techniques show that Ti3+ ions are reduced to Ti metal by a two-step mechanism involving the exchanges of one and two electrons. The electrochemical co-reduction of Ti3+ and Al3+ in the NaCl-KCl-AlCl3-Ti2O3 melts at 1123 K was performed. Cyclic voltammetry and square wave voltammetry were applied using a molybdenum electrode to investigate the reduction behavior of Ti3+ and Al3+ and to identify the Ti-Al alloys. A series of redox signals corresponding to different Ti-Al alloys were observed. Potentiostatic electrolysis was conducted using a molybdenum electrode to prepare the Ti-Al alloys. The obtained deposits were characterized by SEM-EDS and XRD. Compounds Layers of TiAl3 and TiAl2 were generated via potentiostatic electrolysis. © 2015 Elsevier Ltd. All rights reserved.


Xian Y.,Shanghai University of Engineering Science | Xian Y.,Chengdu University of Technology | Zhai Q.,Shanghai University of Engineering Science | Sun Z.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | And 3 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2016

With regards to the problem of higher total vanadium (TV) content in slag and lower utilization efficiency of reducing agent Al during the widely-used electro-aluminothermic smelting process of ferrovanadium, investigations were performed from the views of reaction thermodynamics, constituting phases and liquid phase temperature of slag system. Thermodynamics analysis showed that keeping the addition amount of Al constant, TV concentration in slag would enhance with temperature increasing, whereas TV content would decrease with Al concentration in the alloy increasing. Petrographic analysis revealed that MgO mainly distributed in the MgO-Al2O3 spinel phase, and almost all V dissolved in the MgO-Al2O3 spinel. It was suggested that it would be beneficial to reduce the content of TV in slag by controlling the content of MgO. Based on these finding, a gradient smelting approach was proposed, that is, the feeding process was divided into 3 phases with the vanadium oxide weight ratio of 5:3:2, and aluminum adding coefficient of 1.25, 0.93 and 0.58 also showed a gradient reduction. The average aluminum adding coefficient was 1.02, lower than that of the existing process (1.05). This new approach resulted in about 0.64% TV in slag and 0.4% Al concentration in alloy, which were both better than those of the present electro-aluminothermic smelting technique. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.


Li H.-Y.,Chongqing University | Li H.-Y.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Jiao K.,Chongqing University | Wang L.,Chongqing University | And 3 more authors.
Journal of Materials Chemistry A | Year: 2014

A micelle-anchoring method has been developed for the in situ synthesis of V2O3 nanoflakes@C core-shell composites as the electrode materials in supercapacitors. Hexadecyltrimethylammonium bromide (CTAB) micelles assembled to solubilize activated carbon and anchor vanadate ions of the precursor, NH4VO3, onto the carbon surface. During drying and calcination, CTAB and NH4VO3 decompose to produce V2O5, which is carbon-thermally reduced to V2O3in situ. In the as-obtained composites, monodisperse V2O3 nanoflakes stand edge-on the carbon surface, forming a carbon core with a shell layer of edge-on standing V2O3 nanoflakes. Because of the increased electric conductivity and high specific surface area, V2O3 nanoflakes@C composites exhibit a specific capacitance of 205 F g-1 at 0.05 A g-1 over a potential range of -0.4 to 0.6 V, which surpasses those of their individual counterparts (67 F g-1 and 159 F g-1 at 0.05 A g-1 for activated carbon and bulk V2O3, respectively). The composites also showed good cycling stability due to structure support of the inner carbon cores. The proposed method provides a novel strategy to synthesize composites of transition-metal oxides with improved electrochemical performance for applications in supercapacitors. © 2014 the Partner Organisations.


Li H.-Y.,Chongqing University | Li H.-Y.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Wang L.,Chongqing University | Wei C.,Chongqing University | And 2 more authors.
Materials Technology | Year: 2015

Ultralong (NH4)2V6O16·1.5H2O nanobelts were synthesised by a combination of sol-gel and hydrothermal methods. The chemical composition, morphology and microstructure of products were characterised by X-raypowderdiffraction, Fourier transform infrared spectroscopy, field emissionSEM and TEM respectively. Typical (NH4)2V6O16·1.5H2Onanobelts are several hundreds of micrometres in length, 502100 nm in thickness and 2002500 nm in width. It is indicated that SO2-4 ions are critical to the formation of ultralong nanobelts. Electrochemical performance shows that (NH4)2V6O16·1.5H2O nanobelts can exhibit a specific capacitance as high as 220 F g-1 at 0.05 A g-1 over a potential range of 20.1-0.9 V in 1MNaNO3 due to their high conductivity and ion diffusion rate. Thiswork provides new insights for the growth of ultralong NH4V3O8 nanobelts and their application in supercapacitors. © 2015 W. S. Maney & Son Ltd.


Yan B.-L.,Harbin Engineering University | Yan B.-L.,Pangang Group Co. | Yan B.-L.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Yan Y.-D.,Harbin Engineering University | And 3 more authors.
Journal of the Electrochemical Society | Year: 2016

This paper exhibits a novel method to prepare the Ti-Al intermetallic compounds on the liquid aluminum electrode at 1123 K in NaCl-KCl-TiCl3 melts. The electrochemical behavior of Ti ions on a molybdenum electrode in NaCl-KCl-TiCl3 melts was investigated by different electrochemical measurements. The results from transient electrochemical techniques show that Ti3+ ions are reduced to Ti metal by a two-step mechanism involving exchanges of one and two electrons. According to convolution calculation results, electrochemical reduction process of the Ti ion is a one or two-step reversible reduction process. Binary alloy Ti-Al was prepared by potentiostatic electrolysis, and the TiAl3 and TiAl2 intermetallic compounds were identified via X-ray diffraction (XRD). The microstructure and micro-zone chemical analysis of Ti-Al alloy were accomplished by scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS) in this study. The mineral liberation analyzer (MLA) observations of the formation of a Ti alloy demonstrate that this synthetic method for Ti-Al alloys is practical and feasible. © 2016 The Electrochemical Society.


Li L.,Pangang Group Co. | Li L.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | Li K.,Pangang Group Co. | Li K.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization | And 4 more authors.
TMS Annual Meeting | Year: 2015

The current process of production of titanium sponge involves the use of TiCl4 as a feed material and a huge amount of heat is generated during the magnesiothermic reduction process. For this reason, it is possible to agglomerate into a titanium lump with the partial high temperature. And, it is difficult to obtain soft titanium sponge with low content of impurities. In order to solve the current problems in the titanium sponge production process, process optimization experiments study of TiCl4 feeding speed, vacuum distillation temperature, system pressure and time control had been conducted for obtain high quality titanium sponge. Experimental results show that lower feeding speed can improve the output capacity of titanium sponge and softer products can be obtained. The product grade rate of titanium sponge improved significantly. Copyright © 2015 by The Minerals, Metals & Materials Society. All rights reserved.

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