含钒高钙钢渣碳酸化浸取提钒数学模型的研究

一、前言钒钛磁铁矿是我国极丰富的钒资源。从钒钛磁铁矿提钒的方法可概分为两类。一类是先对矿石或精矿进行钠盐焙烧,然后进行水浸,浸取渣再用于炼铁。另一类则是先用矿石或精矿炼铁,再从炼钢炉渣中回收钒。但是用传统的先钠盐焙烧然后水浸的方法从高钙含钒炉渣中提钒,其回收率极低。因此在国内发展了一个碳酸化浸出的方法。钢渣首先在1100℃下加     

冷床区液压系统

该文着重介绍了年产100万吨棒材生产线工程的冷床区液压系统,该系统已经成功应用于首钢长治棒材生产线.冷床区液压系统主要服务于冷床的上料裙板升降液压缸和冷床卸料小车升降液压缸,由泵站和25个阀台组成.文中详细介绍了冷床区液压系统总的设计思路、泵站原理以及阀台原理.     

关于n-维球面上分数阶积分的卷积表示

设 f是Rn 中的单位球面Ωn(n 2 )上的可积函数 ,　　F :={ ψ :｜ ψ｜单调趋于零 ∑∞k=1(Δλψ(k) )kλ- 1logk<∞ }　　Lψ(Ωn) :={ f∈L(Ωn) : φ∈L(Ωn) ,SF-L(φ) (x) =∑∞k =11ψ(k) Yk(f) (x) }其中SF-L(φ)表示 φ∈L(Ωn)且 φ具有零平均 (记作 φ∈L0 (Ωn) )的Fourier Laplace级数。得到了若 ψ ∈F ,则 f∈Lψ ,有 :f =Y0 (f) + φ Dψ 其中 φ ∈L0 (Ωn) ,∑∞k =1ψ(k)cn ,kPnk(ξ·η)是Dψ(ξ·η) ∈L(Ωn) ,且SF-L(φ)表示 φ ∈L(Ωn) ,φ具有零平均的Fourier Laplace级数。     

STUDIES ON GAS-LIQUID-SUSPENDED SOLID MULTIDECK GAS LIFT REACTOR

Following the work on gas lift reactor (Pachuca tank) for gas-liquid-suspended solid 3-phase reaction,multideck gas lift reactors have been developed.This type of reactor has many unique advantages suchas realization of counter-current operation between gas and slurry,reduction of gas consumption and lower-ing of the amount of volatile components of the liquid which has to be recovered from the exit gas.The stability of the overflow tube of the reactor was studied.A semiempirical equation was derived tocalculate the flooding point of the reactor.The operating range of the overflow tube was also deter-mined.This multideck reactor has been operated successfully in a pilot plant of ammonia leaching of copperore.Results agree reasonably well with those predicted from small scale batch experiments.The extractionof vanadium from soda roasted steel slag in a 5-deck reactor with carbon dioxide in the gas phase wasalso satisfactory.Experimental results obtained from the continuous flow 5-deck reactor and those calcu-lated from batch experimental data with CSTR model were in agreement.     

气、液、固(悬浮)反应工程国内外发展概况

本文就气、液、固(悬浮)反应工程近年来的发展情况作一介绍。包括重要的工业背景以及浆料反应器、环流反应器和三相流化床反应器的研究现状。例如在煤的液化、甲烷化、合成甲醇的工艺及设备开发以及其他有机及无机工业领域中的重要应用,反应器内混合、动量、质量及热量传递性质等。此处还讨论了非僵化非均相反应数学模型的建立以及有关的求解技术。     

有限区域上的二维多小波基

加细方程在小波的构造中起着非常重要的作用。本文基于定义在二维平面上的矩阵加细方程及二维伸缩与平移算子理论构造出有限区域上的多分辨分析及二维多小波基。最后给出构造算例。     

棒材轧机冷床裙板液压缸同步控制阀台的改进

冷床是棒材轧线精整区必不可少的设备,裙板是冷床的关键设备之一。论述的冷床15个裙板液压缸同步控制阀台就能很好地解决裙板液压缸的同步控制问题。通过采用比例阀和两级同步马达控制,使裙板液压缸达到高精度的同步效果。     

多小波理论的发展与研究

介绍了正交多小波,双正交多小波以及正交多小波、双正交多小波的不同构造方法,进而给出及改进的多重尺度函数值快速算法.     

单细胞蛋白生产技术现状

本文就单细胞蛋白生产技术的现状作一简要的介绍,包括原料来源、生产规模、使用的微生物、产品的产量及质量管理等,并对现行的生产工艺流程及主体设备作了介绍。     

LIQUID AXIAL BACKMIXING IN MULTISTAGE BUBBLE COLUMN

The characteristics of a staged bubble column can be described by a multi-stage backmixing model,provided: (1) Each stage can be considered as a perfect mixing reactor,and (2) The backmixing coeffi-cients do not vary with time and reactant concentrations.Experimental results indicate that the first conditionis approached under certain conditions,while the second assumption is correct.Studies were made using steady state chemical tracer method to determine the backmixing coefficientsof each plate between stages.The fluid flow through the holes of perforatcd plates is a stochastic process.From the statistical point,the experimental data could be correlated by semicmpirical equation developed.This equation can also be used to correlate the data reported by Nishiwaki for bubble column with plateshaving high percentage of opening area and large size holes between stages.Continuous oxidation of unsaturated sulfur compounds (mainly in the form of thiosulfatc and also somein polythionate form) in nickel ammonium carbonate solution were carried out in bubble columns with heightof 3400mm and diameters of 36 mm and 100mm respectively.The oxidation has to be taken in a multistagebubble column for high degree of oxidation.The axial concentration of unsaturated sulfur compoundsalong a multi-stage bubble column can be calculated from the backmixing model and the kinetic equationof oxidation.Results of calculation agree with the data taken along the column height.Equation was alsodeveloped to calculate the optimum temperatures of oxidation which agree favorably with the experimentalresults.