Foaming accelerators for polypropylene microcellular foamed plastics

The effects of three foaming accelerators, ZnO, nanometer ZnO, and ZnO/Zn(st)2, on the thermal decomposition property of foaming agents and the ability to create microcellular foam in polypropylene (PP) microcellular foaming plastics are studied. The influence of these accelerators on the microcellular structure of PP microcellular foaming plastics is analyzed by using a thermogravimetry technique. The dispersion of foaming accelerators in resins is observed using scanning electron microscopy. It is shown that the compositing foaming accelerators exhibite a comparatively better dispersion. The properties of different accelerators containing foaming materials are investigated and compared. Compared to those without foaming accelerators, the impact strength of PP microcellular foaming plastics with foaming accelerators is significantly enhanced.     

Viscosity Calculating Model of Iron-bath Smelting Reduction Slag

It is thought that the smelting reduction is one of the advanced technology for metallrugical industry. The constitutes and characters change continuously because the charging is loaded periodically. The influence of slag viscosity is important for smelting process. The foundation of viscosity calculating model is propitious to rapidly forcast the slag viscosity. The viscosity calculating model of melting slag is founded according to the ion theory and the characters of iron-bath smelting reduction slag, the calculating program is finished. The result indicates that the calculating value and the measuring value is approaching. This model can be applied to calculate or forecast the iron-bath smelting reduction slag viscosity.     

Erosion of Smelting Reduction Melt on Refractory Lining

The melt of smelting reduction with iron bath Possessed high oxidizability andlow basicity. This paper studied the erosion rate and extent of molten slag and iron on different kindsrefractories and the micro-structure changing.It was shown that the main factor of corrosion liningwas the reaction between melt and oxide existing in lining.The serious zone was the interfacebetween slag and iron bath and slag surface. The greater the concentration of iron oxide,the higherthe erosion rate is.So is the temperature.     

Mechanism of Multipeaks Feature forVanadium titanium containing Magnetite in Smelting Reduction

The mechanism of multipeaks of reduction rate for vanadium titanium containing magnetite in the process of smelting reduction has been studied.The structure feature of vanadium titanium containing magnetite and changing character of slag structure as well as the kinetic feature of vanadium titanium containing magnetite in smelting reduction process were also analysed in this paper.     

Study on Melting Rate of Pre reducted Pellet in Smelting Reduction Reactor

The successive approaching and rapid cooling method is applied to determine the terminal point of melting,the melting rate of pre reducted pellet is carefully measured.Various factors influencing melting rate are studied via orthogonal experiment,and the influences of main factors are carefully studied via the single factor experiment.The apparent activation energy is expounded and calculated.     

黑木耳多糖馒头的研制

以传统馒头配方及工艺为基础,将黑木耳作为原料添加到馒头中。通过单因素试验及正交试验确定黑木耳多糖馒头最佳配方。结果表明,影响黑木耳多糖馒头品质的4个因素主次顺序为黑木耳浆添加量>白砂糖添加量>酵母添加量>加水量。黑木耳多糖馒头最佳配方为黑木耳浆添加量10%,酵母添加量0.7%,加水量50%,白砂糖添加量10%。该条件下生产出来的黑木耳多糖馒头感官评分最高,馒头品质最好。     

Behaviour of Reduction and Impoverishment of TiO2 in Molten Slag in Smelting Silico-titanium Ferroalloy Using Titanium-bearing slags by Electrosilicothermic Method

In this paper the mathematical model is established on the behaviour ofreduction and impoverishment of TiO2 in molten slag in smelting silico-titanium ferroalloy usingtitanium bearing slag by electrosilicotherinic procese under experimental conditions.It is studied thatthe influences of smelting conditions,such as smelting temperature,initial basicity of burden,quantity of reductant,smelting time and TiO2 content of slag on the reduction and impoverishmentof TiO2 in molten slag.     

A Primary Investigation on Concrete Made from Iron and Steel Slags for Building Ecological Artifical Reefs

A method of orthogonal test was used to optimize the strength of the cementitious material for preparing the concrete of high-strength artifical reefs.The results show that with the ratio of iron slag:steel slag=7:1,and when 10% cement clinker and 10% gypsum of Flue Gas Desulfurization Waste (FGDW) was mixed with 80% iron and steel slags powder,the mixed cementitious material had an optimized strength.The optimized specific surface area are 480 m 2/kg and 550 m 2/kg for iron slag and steel slag powder respectively.The ordinary portland cement can be totally substituted by such a mixed cementitious material with iron and steel slags as its major components in preparing the concrete for building high-strength artificial reefs.A concrete with a compressive strengh over 65MPa can be prepared by using such a mixture as a cementitious material and steel slag grains as its fine and coarse aggregats which have been stubilized by a hot-simmering method. Hydration processes of net slurry were analysized by XRD and SEM methods. The results show that the hydration products in the system are mainly AFt and C-S-H gel. The results also show that the pozzolanic reaction of iron slags could be largely promoted by the coordinations of steel slags,clinker and FGDW.     

Pretreatment of Coke Oven Waste Water with Iron Scrap Method

Denitrification of Coke oven waste water is most biological.That COD/NH 3 N is too high is adverse to biological denitrification.Iron scrap method is used to pretreat coke oven wastewater in order to degrade COD.Coke oven wastewater is pretreated by iron scrap with ancillary material. A good result is got that the removal efficiency of COD cr of wastewater is 40% or so without regulating pH of wastewater and the solution is alkaline.The results show that the factors arragned in important order as the follows:the quantity of iron scrap,graphite,ancillary material A, treatment time,aeration time.The removal efficiency of COD does not lower ater the reactor has run about two months. The results are stable.     

Calibration of Nonlinear Dynamical Analysis for RC Frame-wall Structure with Slender Coupling Beams Considering Stiffness Reduction

Two 16-storey frame-wall structures with slender coupling beams in regions of Intensity 8(0.2 g),with and without considering the stiffness reduction of the coupling beams,were designed.Nonlinear dynamic response analyses of two typical frame-wall structures subjected to several ground motions were carried out.The analyses were based on the quasi-tridimensional program for nonlinear dynamic response analysis TS-EPA.The analyses led to the following conclusions: Under rare earthquake actions,the coupling beams in framewall structures yield first.This shows that the coupling beam in frame-wall structures is the member at the forefront of earthquake resistance.Comparison of the analytic results of two couples with and without considering the stiffness reduction of the coupling beam found that,in view of the dynamic response to and the requirement for ductility under rare earthquake motions,reducing stiffness causes a minor unfavorable influence on the dynamic response of frame-wall structures.     

Study on the Model for Accounting the Cost of Discarded Iron

Starting with the view of wealth taking advantage of the method of in put-output analysis,paying attention to both the labor value com prehended in discarded iron and thevaiue of raw natural resource in it,this paper presents a general model to accou nt the cost ofdiscarded iron,As an example of our country.the model of accounting the cost of the discarded ironhas been stueied carefully and the cost of discarded iron is calculated. the resuIt of calculationindicates the practieality of this model.     

Simulation for Logistics in Steel-making Process of Panzhihua Iron and Steel Corporation

To solve potential scheduling problems in production after renewal of continuous casting process in Vanadium-extracting and Steel-making Plant of Panzhihua Iron and Steel Corporation (PISCO), how to model and simulate logistics system in steel-making processhas been discussed. A series of simulatingtests for logistics system in steel-making processhave been conducted based on inputs of presentsteel-making processof PISCO. In the tests, cases of regular schedule case and cases with repairing converter have also been regarded as essential simulation condition. It has been shown that three casters can not start at same time in order to ensure continuous hot metal supply for casters when three kinds of steel are made. It has also been shown that the simulation system for logistics system in steel-making processis valid and can be used for simulating logisticsin upcoming 100% continuous casting process of PISCO. The better schedule scheme of production and reasonable match of converter-caster in time and capacity can be achieved with the help of using simulation approach.     

The Design and its Implementation of a MultiMedia Course for Cast Iron Welding

How to develop a multimedia course for cast iron welding is discussed.The course is implemented with a multimedia application development software ToolBook 3.0.     

农产品中真菌毒素γ辐照降解的研究进展

介绍了农产品中真菌毒素的危害性,综述了γ辐照对农产品中真菌毒素降解的研究进展。     

化肥减施配合生物有机肥对土壤特性和燕麦产量的影响

针对燕麦生产中肥料施用过量的问题,在大田试验条件下,设置减施50%化肥(50D)、减施25%化肥(75D)、100%化肥(CK)、减施50%化肥+生物有机肥(50DM)、减施25%化肥+生物有机肥处理(75DM)等5个处理,分析了土壤3种酶活性、土壤养分含量和燕麦产量,研究减量磷酸二铵并配施生物有机肥对土壤特性和燕麦产量的影响。结果表明：在燕麦开花期和收获期75DM处理下0~20 cm土壤蔗糖酶、脲酶活性和过氧化氢酶活性显著提高,在收获期较CK分别提高7.6%、12.6%和25.2%;与CK相比,化肥配施生物有机肥处理有效增加了燕麦收获期土壤碱解氮含量,增幅为9.8%~22.9%,且以75DM处理最优。化肥配施生物有机肥处理下燕麦有效穗数、穗粒数和千粒重显著增加,其中以75DM处理籽粒产量最高,分别较75D和CK提高24.5%和9.3%。相关性分析表明,土壤酶活性、土壤养分与燕麦产量呈显著正相关。在大田生产条件下,减施25%化肥并配施600 kg/hm²生物有机肥可提高土壤酶活性,增加土壤中有效性氮、磷、钾的含量,从而改善土壤肥力和土壤养分状况,有利于燕麦增产。     

磺基水杨酸示差光度法测定自来水中的微量铁

对传统的磺基水杨酸测定铁含量的方法进行了改进,采用示差光度技术,使测量方法的线性范围向下扩展,在1～20μg/25mL时呈现良好的线性关系,相关系数R=0.999。用于自来水中铁含量的测定,回收率达89.8%～96.0%。     

Cold Simulated Experiment of Mixed Condition in Boiler Using Gas Reburning for NOx Reduction

The principle of NO x reduction using gas reburning in boiler is analyzed. The experimental device is set up according to the principle of cold simulation. Replacing natural gas with hot air, the cold simulated experiment of mixed condition in boiler has been done. The method reflecting the mixed condition in boiler by means of surveying the uniformity of temperature is put forward on the basis of the similarity of momentum, heat and mass transfer processes. In the meantime, the temperature of different sections in furnace is measured and mean square difference of temperature field is calculated. The effect of flow rate and position of nozzle on the mixed condition in boiler is investigated.