平果一期工程氧化铝分解及分级工艺流程的选择

论述平果铝业公司氧化铝厂引进分解分级工艺的合理性,并介绍了引进的设备和装备及生产指标。     

平果铝赤泥综合利用探讨和建议

平果铝赤泥是一种宝贵的二次资源 ,通过合理的工艺 :赤泥制取海绵铁 ,磁选尾矿碱焙烧、浸出回收铝、钒 ,浸渣酸分解—有机萃取分离回收钪和稀土 ,水解回收钛、锆。不仅消除了环保上的隐患 ,并能创造出新的经济价值。     

30万t横切生产线稀油润滑加热系统改造

首钢京唐公司30万t横切生产线稀油集中润滑系统在运行过程中,原套管式电加热器存在加热功率偏小与加热效果不良等问题,通过将原套管式加热器改造为管道式电加热器,同时优化了压力、温度、流量联锁控制,解决了该润滑系统加热器存在的突出问题.     

Computer- aided determination of the molar excess heat capacity, ACP(T,X), from calorimetric data

All traditional evaluation techniques for determining the temperature,T, concentration,X, dependences of the molar excess heat capacity, ΔC_P (T,X), from calorimetric data involve the problem that the molar excess heat capacities, ΔC_P (T,X), are determined from finite differences. In essence, a heat capacity value is then the quotient of the difference between two ΔH values divided by the difference between the two corresponding temperature values. A new evaluation technique has been developed to overcome this problem. Considering the best-fit parameters as simultaneously dependent on the temperature,T, and on the concentration,X, an overall regression of all measured data of all investigated sample compositions,X, and temperatures,T, is possible. Application of the proposed evaluation technique is illustrated with data for liquid Cu-Sb, Mg-Pb, Bi-Te, In-Sb, and Au-Ga binary systems. The individual features of the systems as well as the advantage of an interactive evaluation are discussed in detail.     

Evaluation of thermal properties of UO2 and PuO2 by equilibrium molecular dynamics simulations from 300 to 2000 K

The thermal properties of UO₂ and PuO₂ have been investigated by the equilibrium molecular dynamics (EMD) simulations between 300 and 2000 K using the Born–Mayer–Huggins interatomic potential with the partially ionic model (PIM). The thermal expansion behaviors of UO₂ and PuO₂ are well reproduced by assuming that the effective ion valence is 67.5% for PIM. The constant-pressure heat capacities deduced only by the present EMD simulation are a little smaller than experimental data. This result explains that the electronic contribution, Schottky or small polaron contribution, is not small for the heat capacity of the actinide oxide including 5f-electrons. The thermal conductivity estimated by the Green–Kubo formula under the NVE ensemble is comparable with experimental data at temperatures greater than 500 K.     

Temperature dependence (300 to 10K) of the structural and electronic properties of the molecular charge-transfer salt (BEDT-TTF)3 Cl2,2H2O

The crystal and electronic structure of the molecular charge-transfer salt (BEDT-TTF)₃ Cl₂ 2H₂O was determined at 10, 130, 190 and 295K. The thennal expansion has been evaluated from measurements of cell parameters between 10 and 295K.     

In situ self-organization of carbon black–polyaniline composites from nanospheres to nanorods: Synthesis, morphology, structure and electrical conductivity

Nanostructured composites of polyaniline (PANI) with carbon black (CB) were synthesized by an in situ self-organization process. The synthesis is based on the polymerization of aniline in a micellar solution of p-toluenesulfonic acid (TSA) with different weight percentages of CB using ammonium peroxydisulfate (APS) as the oxidizing agent. Field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), UV–vis spectroscopy, and the four-probe meter were used to study the morphological, structural, thermal, and electrical properties of CB–PANI nanocomposites. The results demonstrate that the morphology, thermal stability, and electrical conductivity of the nanocomposites were significantly influenced by the content of CB. SEM results reveal that there was a transition in morphology from composite nanospheres to one-dimensional (1D) composite long nanorods with an increase of CB content. XRD and UV–vis spectra results revealed that there was an increase in the crystallinity and a shift of quinoid transition bands towards lower wavelengths as the amount of CB in the composite increased. The mechanism for the formation of nanostructured composites was explained on the basis of the self-organization of micelles. CB–PANI nanocomposites with a maximum electrical conductivity of 1.38 S/cm were obtained; this is at least three orders of magnitude higher than that of pristine PANI.     

2007年1～5月份我国钢管行业产量、进出口量情况及下半年形势预测

<正>2007年,国家淘汰落后产能和节能减排宏观调控政策以及出口退税调整政策的出台,将对国内钢管行业全年的形势产生深远的影响。从宏观形势看,由于国内国际市场持续旺盛的需求,上半年的