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Thermodynamic analysis and phase characterization of hercynite with TiO2 addition
Mingwei Yan, Yong Li 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.2
Analytically pure Fe2O3, Al2O3 and TiO2 were used as raw materials, batched in the TiO2: Fe2O3: Al2O3 mass ratio of 0: 44:56 and 2: 44:56, respectively, and pressed into specimens with size of Φ25 mm × 30 mm. The green specimens were firedin a CO2 and CO mixing atmosphere at 1550 oC for 6hrs. The fired specimens were characterized by XRD, Rietveldrefinement, SEM, EDS, and XPS to investigate the existing state of TiO2 in the synthesized specimens. The resultsshow that after firing at 1550 oC for 6 hrs, the specimen added with TiO2 has a homogeneous structure andas its phase. The introduced TiO2 participates in the synthesis reaction ofhercynite and enters into crystal lattices of hercynite in the form of Ti4+. Ti4+ occupies the tetrahedron and octahedronpositions, increasing the lattice constant.
Zhihu Yan,Caili Dai,Mingwei Zhao,Yongpeng Sun,Guang Zhao 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
Through extensive experiments, a reusable viscoelastic surfactant (rVES) fracturing fluid using a selfdesignedand synthesized surfactant was developed. Laboratory performance evaluation results showedthat various performances of rVES fracturing fluid are excellent. The most attractive aspect is the gellingand gel breaking of rVES fracturing fluid was achieved by altering the pH value. The recycled fracturingfluid still maintains good performances through three times cycles, which represents that it has goodprospects for re-use of flowback waters. In addition, large-scale coarse-grained molecular dynamics(CGMD) simulations results clearly revealed the formation mechanism of rVES fracturing fluid at themolecular level.
Junhong Chen,Mingwei Yan, Yong Li,Zhijian Li,Jindong Su,Bin Li,Jialin Sun 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.5
Periclase-hercynite bricks were prepared from fused or reaction-sintered hercynite. The microstructure of the obtained brickswas studied and their thermal conductivity in the simulated on-site condition was tested. The results show that the mutualdiffusion of Fe or Al from hercynite and Mg from periclase forms more pores in the material. Compared with the brickprepared from fused hercynite, the brick from reaction-sintered hercynite has smaller pore size. The thermal conductivitysimulation test of the two bricks at 1550 oC shows that the cold end temperature of the brick synthesized from the reactionsinteredhercynite is 40 oC lower than that of the brick from the fused hercynite. Thus, in consideration of reducing the shelltemperature of the cement rotary kilns, the reaction-sintered hercynite is more favorable for the production of periclasehercynitebricks.
Structure of hercynite prepared with existence of metal Fe
Junhong Chen,Dongfang Liu,Mingwei Yan, Yong Li,Jindong Su,Bin Li,Jialin Sun 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.12
In this work, raw materials analytically pure Al2O3 and analytically pure Fe2O3 were mixed in FeO: Al2O3 molar ratio of 1 : 1and pressed into specimens. The specimens were embedded in analytically pure metal Fe powders and fired slowly to 1650 oCin air atmosphere, and then soaked at 1650 oC for 5 hrs. The fired specimens were investigated by XRD, SEM, and EDS. Theresults show that the specimen synthesized at high temperatures in melting Fe is composed of hercynite and wüstite (FenO(n ≤ 1)); FenO disperses in hercynite; hercynite crystals develop well and are mostly perfect octahedron with grain size around50μm. The hercynite has Fe/Al ratio smaller than 1/2, which is non-stoichimetric. With the existence of melting Fe, althoughthe raw materials are theoretically batched according to FeO·Al2O3, FenO is still excess, so the hercynite obtained is Al-rich.
Yifei Liu,Caili Dai,Kai Wangb,Mingwei Zhao,Guang Zhao,Shuai Yang,Zhihu Yan,Qing You 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
Aiming at water shut-off in high temperature reservoirs, the hydroquinone (HQ)–hexamethylenetetra-mine (HMTA) gel system was studied. The gelation performance and effects of various parameters weresystematically evaluated. With increase of the concentrations and temperature, gelation time decreasesand gel strength increases. In addition, gelation rate and gel strength were enhanced on adding acid. Moreover, the gel system shows good salt tolerance. The thermal stability measurement indicates thatthe gel can maintain stability up to 140 8C. Uniformly distributed three-dimensional network structurewas formed in the gel. At last, the gelation mechanism was proposed, illuminating the detailed gelationprocess clearly.