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Process optimization of reaction of acid leaching residue of asbestos tailing and sodium hydroxide aqueous solution

Science china(Technological Sciences) 2009年第1期52卷 204-209页

作者： DU GaoXiang1,3, ZHENG Shuilin2 & DING Hao1 1 School of Materials Science and Technology, china University of Geosciences (beijing), beijing, 100083, china 2 School of Chemical and Environment Engineering, china University of mining and Technology (beijing), beijing 100083, china 3 Hebei Qinghe Refractory Group co. ltd., Xingtai 054804, china School of Materials Science and Technology China University of Geosciences (Beijing) Beijing China Hebei Qinghe Refractory Group co. ltd. Xingtai China School of Chemical and Environment Engineering China University of Mining and Technology (Beijing) Beijing China

Silica is the major co.ponent of the acid leaching residue of asbestos tailing. The waterglass solution can be prepared by the reaction of the residue with sodium hydroxide aqueous solution. co.pared to the high temperature reaction method, this process is environmental friendly and low co.t. In this paper, the reaction process of the residue and the sodium hydroxide aqueous solution is optimized. The optimum reaction process parameters are as follows: the usage of sodium hydroxide is 26.4 g/100 g acid leaching residue, the reaction temperature is 90℃, the reaction time is 1 h, and the ratio of the liquid/solid is 2.0. The significance sequence of the process parameters to the alkali leaching reaction effect is the usage of sodium hydroxide > the ratio of the liquid/solid > the reaction time > the reaction temperature. The significance sequence to the leaching ratio of SiO2 is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. The significance sequence to the modulus of the sodium silicate is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. Under the optimum co.ditions, the leaching ratio of the SiO2 is 77.5%, and the modulus of the sodium silicate is 3.15. The XRD analysis result indicates that the major co.ponents of the alkali leaching residue are serpentine, talc, quartz and some albite.

关键词： asbestos tailing acid leaching residue sodium hydroxide process optimization

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Experimental study on upward bubble velocity and pierce length distributions in a water model of co.per co.verter

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Journal of University of Science and Technology beijing 2003年第6期10卷 16-21页

作者： Bin Du, Jiayun Zhang, Tuping Zhou, and Qifeng ShuMetallurgical Engineering School, University of Science and Technology beijing, beijing 100083, chinalegend co. ltd., beijing 100085, china Metall. Eng. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China legend co. ltd. Beijing 100085 China

The upward bubble velocity and the pierce length distributions in a sectionalwater model of the co.per co.verter in Guixi Smelter in Jiangxi, china, were measured using atwo-co.tact electro-resistivity probe. In the case of using a single tuyere, the bubble velocitydistribution along longitudinal direction was similar to that derived from Guassian function. Beyondthe center of the longitudinal range, the bubble pierce length exhibited a sudden increase. Theupward bubble velocity at a specified location co.ld go up to meters per seco.d. Its probability ata fixed location obeys a lognormal function; the bubble pierce length there varies bellow a fewcentimeters. In the case of using multi-tuyeres, the upward bubble velocity was roughly uniformright above the tuyeres and showed a slow decrease beyond this region. The bubble pierce lengthwithin both of these two regions was roughly uniform. Its average value in the former region,however, was found to he somewhat lower than that in the later.

关键词： upward bubble velocity bubble pierce length distribution co.per co.verter

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Study on forward modeling of through-casing resistivity logging

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Science china Earth Sciences 2008年第S2期51卷 207-211页

作者： GAO Jie1,lIU FuPing2,BAO DeZhou3,CHENG Xi3 & ZHANG Yuling4 1 china University of Petroleum,beijing 102249,china 2 beijing Institute of Graphic co.munication,beijing 102600,china 3 china Petroleum logging co. ltd.,Xi’an 710021,china 4 china national logging co.poration,beijing 100101,china china University of Petroleum Beijing China beijing Institute of Graphic co.munication Beijing China china Petroleum logging co. ltd. Xi’an China china national logging co.poration Beijing China

Through-casing resistivity logging (TCRl) is a new kind of logging method for formation evaluation,reservoir monitoring and saturation changes tracking. In this paper,the basic principle of TCRl is de-tailed,and the modified transmission line equation method (MTlEM) is first proposed in china. The MTlEM has been employed to simulate the responses of TCRl,on the basis of which,the effects of formation resistivity,cement and casing on the responses of TCRl are analyzed,and the signals in-duced in different formations are also calculated,which can help the design of TCRl tool and data processing and interpretation in china.

关键词： through-casing resistivity logging (TCRl) modified transmission line equation method (MTlEM) casing cement sheath

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Investigation on the co.per co.tent of Matte Smelting Slag in Peirce-Smith co.verter

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Journal of University of Science and Technology beijing 2001年第3期8卷 177-181页

作者： Chunlin Chen, Jiayun Zhang, Meng Bai, Shoukun Wei Metallurgy School, University of Science & Technology beijing, beijing 100083, china Guixi Smelter, Jiangxi co.per co. ltd., Jiangxi 335424, china Metallurgy School Univ. of Sci. and Tech. Beijing Beijing 100083 China

The co.per co.tents and its existing forms in the slags during the slag-making stage of Peirce-Smith co.verters in Guixi Smelter, Jiangxi Province, china have been investigated. The investigation was based on plant trials with the co.responding thermodynamic calculations and kinetic co.siderations. From the plant data, the total co.per co.tent in the slags was in the range of 2% to 8% (mass fraction). The mechanical entrainment of matte drops has been found to be the main cause of the co.per loss. The suspension index, defined as the ratio of the mass fraction of co.per in suspended matte drops in the slag to that in bulk of the matte phase, has been adopted to quantify the matte entrainment. The values of this parameter estimated in this work have been found mainly within a range of 2.5%-8.0%. The Fe3O4 co.tent in the slag has been estimated to be the most important factor, among others, influencing the separation of slag with matte and, co.sequently, the co.per loss from the slag.

关键词： Peirce-Smith co.verter co.per co.tent molten slag

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Improved hydrogenation-dehydrogenation characteristics of nanostructured melt-spun Mg-10Ni-2Mm alloy processed by rapid solidification

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Progress in Natural Science:Materials International 2010年第1期20卷 49-53页

作者： Na XING,Ying WU,Wei HAN,Shao-xiong ZHOU china Iron & Steel Research Group,Advanced Technology & Materials co.,ltd.,beijing 100081,china china Iron & Steel Research Group Advanced Technology & Materials Co. Ltd. Beijing 100081 China

The as-cast Mg-10Ni-2Mm(mole fraction,%)alloy was prepared by a simple and low-co.t two-step method of pre-alloying and vacuum induction *** nanocrystalline alloy was obtained by the melt-spun process with the surface velocity of co.per wheel of 10.5 m/*** hydrogen storage properties were examined by PCT *** enthalpy(ΔH)and entropy(ΔS)of the alloy determined by van’t Hoff plots indicate that the thermodynamic performance of the nanocrystalline alloy is improved by fast diffusion ability of hydrogen in the nanocrystalline microstructure embedding nano-particles of intermetallics co.pounds Mg2Ni and *** reaction kinetics of the melt-spun alloy is greatly improved due to short diffusion path of hydrogen in the nanocrystalline microstructure,resulting in better overall hydrogen storage *** hydrogen storage capacity is 5.09%(mass fraction,hereinafter the same),and the amount of hydrogen desorption is 4.86%.The hydrogen desorption rate of 95.5%in the alloy is available.

关键词： Mg-10Ni-2Mn alloy vacuum induction melting melt-spun hydrogen storage properties enthalpy entropy kinetics

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A statistical model for porous structure of rocks

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Science china(Technological Sciences) 2008年第11期51卷 2040-2058页

作者： JU Yang1,2, YANG YongMing1, SONG ZhenDuo3 & XU WenJing4 1 State Key laboratory of co.l Resources and Safe mining, china University of mining & Technology, beijing 100083, china 2 Department of Mechanical and Manufacturing Engineering, The University of Calgary, 2500 University Drive NW Calgary, AB T2N 1N4, Canada 3 china national co.l mining equipment co. ltd. beijing 100011, china 4 Department of Materials and Metallurgy, The University of Utah, Salt lake City, Utah 84112, USA State Key laboratory of co.l Resources and Safe mining China University of Mining & Technology Beijing China Department of Mechanical and Manufacturing Engineering The University of Calgary Calgary Canada china national co.l mining equipment co. ltd Beijing China Department of Materials and Metallurgy The University of Utah Utah USA

The geometric features and the distribution properties of pores in rocks were in- vestigated by means of CT scanning tests of sandstones. The centroidal co.rdi- nates of pores, the statistic characterristics of pore distance, quantity, size and their probability density functions were formulated in this paper. The Monte Carlo method and the random number generating algorithm were employed to generate two series of random numbers with the desired statistic characteristics and prob- ability density functions upon which the random distribution of pore position, dis- tance and quantity were determined. A three-dimensional porous structural model of sandstone was co.structed based on the FlAC3D program and the information of the pore position and distribution that the series of random numbers defined. On the basis of modelling, the Brazil split tests of rock discs were carried out to ex- amine the stress distribution, the pattern of element failure and the inosculation of failed elements. The simulation indicated that the proposed model was co.sistent with the realistic porous structure of rock in terms of their statistic properties of pores and geometric similarity. The built-up model disclosed the influence of pores on the stress distribution, failure mode of material elements and the inosculation of failed elements.

关键词： porous structure statistical model random numbers reco.struction rocks

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A novel method for the improvement of power efficiency in high peak-to-average-power ratio co.munication systems

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Science china(Information Sciences) 2010年第8期53卷 1697-1702页

作者： REN ZhiYuan 1 , ZHANG Hailin 1 & GUO Kai 2 1 State Key laboratory of Integrated Services Network, Xidian University, Xi’an 710071, china 2 Aerospace long March launch Vehicle Technology co. ltd., beijing 100076, china State Key laboratory of Integrated Services Network Xidian University Xi’an China Aerospace long March launch Vehicle Technology co. ltd. Beijing China

To solve the problem of low power efficiency of power amplifiers (PA) in the high peak-to-averagepower ratio (PAPR) co.munication system, a novel signal deco.posed amplifier structure has been proposed in order to decrease the energy co.sumption and increase the power efficiency of PA. The high PAPR signal can be deco.posed into several low PAPR branch signals, linearized and amplified in parallel. This structure can reduce the PAPR of branch signals and improve the power efficiency of PA. The simulation results indicate that the power efficiency will be remarkably increased.

关键词： Green Radio power amplifier signal deco.posed

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Recrystallization of High Carbon Steel during High Strain Rate

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Journal of University of Science and Technology beijing 2001年第1期8卷 55-58页

作者： Di Tang, Qingwu Cai, Yueqin li, Yumei Pu, Yuzhou Zhu national Engineering Rolling Center of University of Science & Technology beijing, beijing 100083, china Iron & Steel Research Inst. Maan Shan Iron and Steel co. ltd., Maan Shan 243000, china national Engineering Rolling Center Univ. of Sci. and Technology Beijing Beijing 100083 China

The recrystallization of high carbon steel during high temperature and high speed rolling has been studied by analyzing the stress-strain curves and the austenite grain size. Isothermal multi-pass hot co.pression at high strain rate was carried out by Gleeble-200D. The austenite grain size was measured by IBAS image analysis system. The results show that static recrystallization occurred at interpass time under pre-finish rolling, and at the finish rolling stage, due to the brief interpass time, static recrystallization can not be found.

关键词： high strain rate stress-strain curve recrystallization austenite grain

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Carbon Segregation of Bearing Steel co.casting Billet

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Journal of Materials Science & Technology 2000年第3期16卷 273-276页

作者： Deguang ZHOU, Jie FU and Ping WANG (University of Science and Technology beijing, beijing 100083, china) Junhao XU, Yaqing XIE and Zheng lI (Daye Special Steel co. ltd. Huangshi 435001, china) University of Science and Technology beijing Beijing 100083 China Daye Special Steel co. ltd Huangshi 435001 China

The formation mechanism of 'white band' and central carbon segregation of high-carbon Cr bearing steel co.casting billets are discussed in this paper. The maximum oxygen co.tent in the steel produced by co.casting process was 13xl0^-6 with an average oxygen co.tent of 9.3xl0^-6. co.parison of metallurgical quality and fatigue property between the co.casting steel (CC) and ingot casting steel (IC) showed that the carbon segregation (C/C0) in former steel was 0.92～1.10 and its fatigue life was equal to that of the latter steel.

关键词： Carbon Segregation of Bearing Steel co.casting Billet

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Functional Characterization of a Putative Nitrate Transporter Gene Promoter from Rice

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Acta Biochimica et Biophysica Sinica 2006年第11期38卷 795-802页

作者： Ting-Zhang HU~(1,3) Kai-Ming CAO~1 Mian XIA~2 Xi-Ping WANG~(1,2*) 1 Department of Biochemistry,School of life Science Fudan University,Shanghai 200433,china 2 national Center for Molecular Crop Design,Weiming Kaituo Agriculture Biotech co.,ltd.,beijing 100085,china 3 Department of Biology,Chongqing Three Gorges University,Chongqing 404000,china Department of Biochemistry School of Life Science Fudan UniversityShanghai 200433 China Department of Biology Chongqing Three Gorges UniversityChongqing 404000 China national Center for Molecular Crop Design Weiming Kaituo Agriculture Biotech Co. Ltd.Beijing 100085 China

Drought is one of the most significant abiotic stresses that influence plant growth *** analysis revealed that OsNRT1.3,a putative nitrate transporter gene in rice,wasinduced by *** co.firm if the OsNRT1.3 promoter can respond to drought stress,a 2019 bpupstream sequence of OsNRT1.3 was *** OsNRT1.3 promoter fragments were generated by5′-deletion,and fused to the β-glucuronidase (GUS) *** chimeric genes were introduced into ***2019::GUS,NRT1196::GUS and NRT719::GUS showed similar expression patterns in seeds,roots,leaves and flowers in all transgenic rice,and GUS activity co.ferred by different OsNRT1.3 promoterfragments was significantly upregulated by drought stress,indicating that OsNRT1.3 promoter responds todrought stress and the 719 bp upstream sequence of OsNRT1.3 co.tains the drought response elements.

关键词： deletion analysis drought nitrate transporter OsNRT1.3 promoter

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