KINETICS OF REACTION BETWEEN PbS AND PbO

The rate equation of reaction between PbS and PbO is dα/dt=kx_(PbS)~3 x_(PbO)~(-2).A transition product,PbSO_4·2PbO,is found by X-ray diffraction analysis.The reaction mechanism was dis-cussed on the basis of electron transfer.     

奥氏体氮碳共渗的生长动力学和内部过程

奥氏体氮碳共渗时渗层增长常偏离抛物线规律，呈现正偏差和负偏差，ε相层甚至出现负增长。分析了这一生长特点与炉内气氛的关系。根据共渗层中碳、氮原子分布的互补性、碳原子浓度的负梯度现象，讨论了碳、氮原子间的交互作用以及少量碳原子对共渗过程的影响，解释了氮碳共渗时的生长动力学，并对渗层正常生长的条件作了分析。     

PbS和PbO反应动力学及其机理SCIEI

本文得出了PbS和PbO交互反应的速率方程:(da)/(dt)=kx_(PbS)~3x_(PbO)^(-2);发现了反应过程中有过渡产物碱式硫酸铅(PbSO_4·2PbO);从电子转移角度,探讨了反应机理。     

ELECTROCHEMICAL KINETICS ON BULK CONCENTRATE SEPARATION OF PYRITE AND GALENA

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｅｐａｒａｔｉｏｎｏｆｐｕｌｐｅｌｅｃｔｒｏｃｈｅｍｉｃａｌｆｌｏａｔａｔｉｏｎｏｆｓｕｌｆｉｄｅｍｉｎｅｒａｌｓｄｅｐｅｎｄｓｏｎｄｉｆｅｒｅｎｃｅｓｉｎｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｔｈｅｔｈｒｅｆａｃｔｏ...     

THE RATE OF TEMPERATURE INCREASE AND THE KINETICS OF PbS AND PbO IRRADIATED WITH MICROWAVE

The rate of temperature increase and the kinetics of PbS and PbO, irradiated with microwaves, have been studied. According to the experimental data, the interaction between PbS and PbO is nonisothermal, and the activation energy becomes lower and the rate of interaction becomes faster with microwave irradiation than with conventional heating.     

几种催化裂化催化剂的磨损机制与动力学

催化剂磨损失效是流化催化裂化（FCC）过程中所面临的一个重要问题,磨损会造成催化剂跑剂和产品的污染。采用喷杯式(jet-cup) 流化磨损测试方法研究了炼油工业用几种不同抗磨性能FCC催化剂和添加剂的磨损规律,并探索了体系流体力学特性和颗粒自身性质对其磨损行为的影响。实验结果表明,不同粒径的催化剂颗粒具有不同的磨损行为;所有测试催化剂的磨损均由表面剥层磨损和体断裂磨损组成的混合磨损机制所支配;磨损的发展过程符合Gwyn磨损动力学方程,不同颗粒磨损规律的差别可由Gwyn方程的各参数来描述。     

ABSORPTION KINETICS OF HYDROGEN SULPHIDE USING ISOTHERMAL AND ISOVOLUMETRIC METHOD

ＡＢＳＯＲＰＴＩＯＮＫＩＮＥＴＩＣＳＯＦＨＹＤＲＯＧＥＮＳＵＬＰＨＩＤＥＵＳＩＮＧＩＳＯＴＨＥＲＭＡＬＡＮＤＩＳＯＶＯＬＵＭＥＴＲＩＣＭＥＴＨＯＤＨａｉＭｉｎｇｔａｎ；ＬｉｕＣｈａｎｇｑｉｎｇ；ＺｈａｎｇＰｉｎｇｍｉｎ；ＣｈｅｎＱｉｙｕａｎ（Ｄｅｐａ...     

MODELING OF ISOTHERMAL PRECIPITATION KINETICS IN HSLA STEELS AND ITS APPLICATION

1.IntroductionMicroalloying elements, such as Nb, Ti and V in HSLA steels precipitate during hot-rolling pro-cesses, which plays an important role in determining mechanical properties of HSLA steels[1].In order to model the precipitation behavior, many quantitive models[2-8] have been proposed. These models, however, can only be applied to single microalloyed steels. As temperature decreases continu-ously during hot deformation processes, isothermal data can not be used directly to predic…     

影响雾化器工作效率的几个因素

从流体力学的原理出发,深入地分析了旋涡环缝式雾化器的工作特征,指出不合理的结构尺寸,内壁粗糙度偏高以及环缝的同心度得不到保证等因素都能影响到雾化器的工作效率,一件性能优良的雾化器,应当使流体雾化介质在流经雾化器时的能量损失较低,并能使雾化介质自环缝喷出时的线速度较高。     

常减压设备环烷酸腐蚀分析

通过将不同的钢材置于静、动态的环烷酸环境中进行腐蚀模拟实验,根据所得到的数据,进行动力学分析,求取反应的动力学常数,可以发现反应平衡常数k及活化能Ea是环烷酸腐蚀程度的重要表征量,要抑制环烷酸的腐蚀,可以通过降低平衡常数,提高反应活化能的途径来实现. 关键词：      

KINETICS OF REACTION BETWEEN Cu_2S AND Cu_2O

Reaction between Cu_2S and Cu_2O was investigated at 1150 to 1250℃.The reaction rate in-creases with the increase of surface area of Cu_2O grains and depends unobviously on temper-ature.At the suggestion of controlling step of reaction rate being oxygen diffusion through theliquid layer along reaction boundaries,two final kinetical equations would be made as follows:x=6.69×10~(-2)At for 0<α<0.74 and ln(l-α)=-A(9.83×10~(-2)t+1.76)for 0.74<α<1,whereα is SO_2 evolved in time t and A is surface area of Cu_2O particles.     

IMPROVED LEACHING METHOD AND KINETICS OF MANGANESE CARBONATE ORE AT ROOM TEMPERATURE

ＩＭＰＲＯＶＥＤＬＥＡＣＨＩＮＧＭＥＴＨＯＤＡＮＤＫＩＮＥＴＩＣＳＯＦＭＡＮＧＡＮＥＳＥＣＡＲＢＯＮＡＴＥＯＲＥＡＴＲＯＯＭＴＥＭＰＥＲＡＴＵＲＥＹｕａｎＭｉｎｇｌｉａｎｇ；ＭｅｉＸｉａｎｇｏｎｇ；ＣｈｅｎＪｉｎ；ＺｈｕａｎｇＪｉａｎｍｉｎｇ（Ｄｅｐ...     

KINETICS OF THERMAL DECOMPOSITION OF SYNTHETIC GIBBSITE

The thermal decomposition of synthetic gibbsite has been investigated by means of DSC and X-raydiffraction methods.The mechanism of thermal decomposition and kinetic parameters were determined at tem-peratures ranging from room temperature to 400℃.     

晋东北金矿床石英流体包裹体与找矿

晋东北各种类型金矿中都广泛发育热液型石英脉，与矿化有关的石英流体包裹体的特征反映了不同的矿床类型。对该区石英脉型、蚀变岩型及磁铁石英岩型金矿床的研究表明，石英中流体包裹体的成分、温度和红外吸收光谱等特征可以作为划分矿床类型和作为金矿找矿评价的标志     

不锈钢在液固双相流中的冲蚀腐蚀行为

采用旋转圆筒电极装置研究了１Ｃｒ１３（铁素体）、３１６Ｌ（奥氏体）、０Ｃｒ１４Ｎｉ５Ｍｏ（马氏体）及ＣＤ－４ＭＣｕ（α＋γ双相）等不锈钢在不同流速水砂双相流中的冲蚀及ＮａＣｌ（＋Ｈ２ＳＯ４）砂浆中的冲蚀腐蚀行为,用ＳＥＭ观察了冲蚀（腐蚀）后材料表面形貌,并测定了样品表层硬度变化。结果表明双相不锈钢ＣＤ－４ＭＣｕ因其较强的加工硬化能力而具有优良的抗冲蚀腐蚀性能。     

ANALYSIS ON KINETICS OF CARBIDE DIFFUSION COATING

A kinetic model for carbide diffusion coating has been proposed bused on the theory of steadydiffusion and the sublattice model of solid solution.It is supposed that the growth rate of car-bide layer is controlled by the volume diffusion coefficient of carbon s in carbide layerand the activity of carbon in steel substrate.The calculated results for V_4C_3 coating treatmentof commercial steels T10.45,Crl2MoV,4Cr5MoVSi are in good agreement with the exper-imental data.     

含碳球团还原过程动力学及模型

本文研究了不同条件下含碳球团在Ｎ_２气氛中的还原过程．结果发现，球团中心的还原速度大于其边缘速度，固相反应Ｆｅ_ｘＯ_ｙ＋ｙＣ＝ｘＦｅ＋ｙＣＯ不是含碳球团还原过程的主要反应；以往的含碳球团还原过程模型不能正确地描述其反应过程．本文提出了含碳球团还原过程的新观点，并以此观点为基础建立了含碳球团还原过程模型，试验证明该模型能很好地描述含碳球团的还原过程．     

改进型Fe_3O_4磁流体的研制及带膜磁畴观察

利用化学反应的方法研制了一种带膜观察磁畴结构的改进型磁流体—Ｆｅ３Ｏ４磁流体,并对其生成条件及影响其磁性的因素进行了分析．实验表明：当ＦｅＣｌ２·４Ｈ２Ｏ：ＦｅＣｌ３·６Ｈ２Ｏ：ＮａＯＨ＝１：１：６（摩尔比）时最容易生成稳定的Ｆｅ３Ｏ４．在反应过程中,水质的好坏及有无搅拌是影响 Ｆｅ３Ｏ４磁流体颗粒大小及磁性的主要因素．对Ｚ８牌号的硅钢片进行带膜磁畴观察表明,该磁流体能够实现带膜观察,成纹性及重现性较好,而且磁稳定性也较好,未经任何处理的Ｆｅ３Ｏ４磁流体可以放置一周左右而磁性不发生变化;用去离子水清洗至ｐＨ值为７并且隔绝空气后,可放置更长时间．     

THE ESTABLISHMENT OF CALCULATION FORMULA FOR CASTING－ROLLING FORCE OF VISCOUS FLUID AND THE INFLUENCE OF TECHNOLOGICAL FACTORS

ＴＨＥＥＳＴＡＢＬＩＳＨＭＥＮＴＯＦＣＡＬＣＵＬＡＴＩＯＮＦＯＲＭＵＬＡＦＯＲＣＡＳＴＩＮＧ－ＲＯＬＬＩＮＧＦＯＲＣＥＯＦＶＩＳＣＯＵＳＦＬＵＩＤＡＮＤＴＨＥＩＮＦＬＵＥＮＣＥＯＦＴＥＣＨＮＯＬＯＧＩＣＡＬＦＡＣＴＯＲＳ￥Ｓｕｎ，Ｂｉｎｙｕ；Ｚｈａｎ...     

KINETICS OF CARBON COMBUSTION IN PLASMA AIR

A new equipment and method for measuring the kinetics of carbon combustion in plasma airhave been designed. The activation energies of graphite combustion in this condition have beengiven: E_1=74.780 kJ / mol (900-1560 K) E_2=44.720 kJ / mol (1560-2100 K)