Advanced Materials Research Vols. 616-618

Abstract: For studying the microscopic mechanism of pulverized coal injection (PCI) process to optimize BF operation further, the multiphase-coupled interactions and combustion phenomena is described by mathematical equations. Some assumptions are employed properly in simulation for solving the equations well. Some physical properties of per-phase obtained through simulating the typical flow behaviors in iron-making process were contrastive analyzed with the field data. The investigation shows that the complex phenomena in a BF can be presented by the computational approach which is proved virtual and robust. The computational results have shown that the gas-solid-powder flow varies spatially, particularly in the raceway; the powder flow is strongly affected by the air and coke particles under the cohesive zone, and by the ore particles upon the cohesive zone; the ability of BF could be enhanced with higher rate of coal injection to a certain extent.

Abstract: A further investigation into the determination of corrosion resistance behavior has been carried out through a series of cyclic corrosion tests in order to comparatively study the corrosion rates of rail steel U68CuCr and U75V under different cycle conditions. The results indicate that U68CuCr possesses better corrosion resistance than U75V. According to macroscopic view, colors of U68CuCr surfaces are all lighter than those of U75V in the same group. Moreover, the grains at the rust layer of U68CuCr specimens show much finer and denser microstructure than U75V. Besides, cracks on the rust layer of U75V specimens are found.

Abstract: By constructing a novel electrochemical cell, the corrosion behavior of pure zinc under the combined layer of 3 wt% sodium chloride electrolyte consisting of an open layer connected with a confined one was studied. The results show that a galvanic corrosion cell is formed once the zinc being covered by the combined layer of electrolyte, where the zinc under the open layer (named as open-Zn) plays as the cathode but the zinc under the confined layer (named as confined-Zn) as the anode, therefore the latter presents the higher corrosion rate. Furthermore, because ions transfer between the open layer and confined layer become difficult, the hydrolysis of excessive zinc ions in the confined electrolyte results the acidification of electrolyte and thus also accelerates the corrosion of confined-Zn. The critical thickness for corrosion of zinc under the combined layer is 105 μm where corrosion rate for both of the open-Zn and confined-Zn reach the maximum.

Abstract: The basic research of collision and float behavior of inclusions in steel metallurgical production process is of great significance. Only when we grasp the mechanism of the collision and agglomeration of the inclusion, can we propose the improvement program of inclusion removal. This paper mainly summarized how to remove the inclusions by floating, studied it through the hydraulics simulation experiment, verified the correctness of the Stokes formula, revised the Stokes formula according to the experimental data, determined a value range of the correction coefficient, and then obtained a more applicable Stokes correction formula.

Abstract: The effect of different composition of refining slag on absorption rate of Al2O3 has been tested by experimental method in the CaO-SiO2-Al2O3-MgO-CaF2-FeO-MnO-P2O5 refining slag. The result shows: under specified condition, CaO/Al2O3 between 1.4 and 1.7, the slag has higher absorption rate of Al2O3,The absorption rate of Al2O3 raised with the increase of the content of CaF2 when the content of CaF2 less than 8%; the absorption rate of Al2O3 increased with the increase of the CaO/SiO2 when the CaO/SiO2 less than 3.5; the maximum absorption rate of Al2O3 is 0.0226 g•cm-2•min-1 when CaO/SiO2=3.48, MI=0.124.

Abstract: For Containing Titanium Stainless Steel, in Liquid Steel the Existence of the Element such as Ti, N, O Are Easily Generating High Melting Point Compounds Tin, Tio2, Etc. the Compounds Easily Deteriorate Slag. the Relationship of Tin between Solubility Product and Temperature in 409 Stainless Steel Is lg([%Ti][%N])=4.6-17036.9/T . the Relationship of Tio2 between Solubility Product and Temperature in 409 Stainless Steel Is lg([%Ti][(%O)2])=11.6-35728/T .The Relationship of Al2O3 between Solubility Product and Temperature in 409 Stainless Steel Is lg（[%Al]2[%O]3）=20.2-62787.9/T .Protective Slag Contains Compounds of B2O3 Mno and Fe2O3 Can Solve the Problem of “floater”.

Abstract: The componential method of ecological footprint is applied to estimate the ecological footprint of the Xi’an University of architecture and Technology (XAUAT) in 2011. An EF value for the urban public university was calculated as 21,398 global hectares with footprint of 0.71 global hectares and ecological capacity of 1.14 per capita. The components considered in this study include energy for the built environment (58%), food (34%), transportation (2.9%), water usage (2.5%) and waste discards (1.5%). Compared to the large urban universities in North America, university campuses in China show similar high density of land use while appear lower consumption levels and utilization rate of resources.

Abstract: In the product design process，according to the environmentally responsible manufacturing principle to carry out remanufacturing engineering design，to achieve the purpose of reducing the amount of raw materials, energy conservation and protect the environment, remanufacture is a systemic engineering to consider the product life cycle, which can prolong the life of the product, optimize product design, achieve minimum cost of product life-cycle and maximum efficiency and minimum environmental pollution ultimately.

Abstract: The seed-swelling method was adopted to synthesized the porous copolymer of 1-allyl-3-methylimidazolium tetrafluoroborate and acrylonitrile P([amim]BF4-AN). The samples were characterized by IR, DSC and CO₂ sorption was investigated by determining equilibrium data. The effects of the amount of initiator and swelling time on the porous structure and CO₂ sorption were discussed in detail. The results indicated that porous P([amim]BF4-AN) with benzoyl peroxide (BPO)0.1g and swelling 20h has the higher CO₂ sorption capacity.

Abstract: This article used the Logarithmic Mean weight Divisia Index(LMDI),analyzed the dynamic changes of carbon footprint of the energy consumption and its influencing factors in He’nan province from 1991 to 2010. The results showed that the carbon footprint and its pressure were increasing, and the carbon footprint intensity was decreasing; Economic development was the main factor of the increasing of carbon footprint in He’nan province, the influences of population scales and energy structure on carton footprint was relatively small; the efficiency of energy use was the main factor to restrain the increasing of carbon footprint; optimizing the energy structure and reducing the ratio of coal in energy consumption were the important means to slow down the increasing of carton footprint in He’nan province.