Preparation of iron-bearing wastes for industrial use

To permit the industrial use of sintering and steel-smelting slurries at OAO MMK, laboratory research is undertaken on the formulation of briquets with specified chemical composition and mechanical strength. In the batch for slurry briquetting, it proves expedient to add rolling scale; a binder consisting of ligno-sulfonate powder and portland cement provides the optimum briquet strength.     

Analysis of the efficiency of alternative methods for recycling iron-bearing metallic wastes

This article compares the total amount of fuel used in making steel from dispersed iron-bearing metallurgical wastes by different alternative technologies. Recycling such wastes by briquetting them and then smelting the briquets in blast furnaces is shown to be clearly more advantageous from an economic and environmental standpoint. The availability of excess pig-iron production capacity at a metallurgical plant allows the plant to recycle the given type of wastes by the most cost-effective means while also reducing emissions of greenhouse gases. Similar results can be obtained by smelting the briquets in cupolas.     

Optimizing control of rotary-kiln operation in the magnetic-blooming method of processing iron-bearing raw materials

The knowledge gained from many years of experience in the pyrometallurgical processing of hard-to-concentrate naturally alloyed raw materials in rotary kilns at the Orsk-Khalilovskii Metallurgical Combine (now Ural Steel) has been used to develop new procedures, technologies, and organizational guidelines that are making it possible to ensure continuous high-productivity operation of the kilns. The combine has also been able to optimize the parameters of the process in order to obtain high-quality products. This article discusses optimizing the operation of rotary kilns for the production of bloomery iron from iron-bearing metallurgical wastes and screened brown ore obtained from the Khalilovskaya group of deposits. The experience that has been accumulated in kiln operation can also be applied to other metallurgical processes carried out in these types of furnaces.     

Plasma processing of carbon-containing technical aggregations and wastes

The plasma gasification of technical aggregations is experimentally studied using the utilization of solid domestic wastes as an example. A shaft electric furnace is described, and the experimental and calculated data are analyzed and compared. The high-temperature gasification of carbon-containing wastes is shown to be a promising process.     

Use of resin-bearing wastes from coke and coal chemicals production at the Novokuznetsk Metallurgical Combine

The coke and coal chemicals plant at the Novokuznetsk Metallurgical Combine is making trial use of a technology that recycles waste products in “tar ponds.” Specialists from the ékomash company have installed a recycling unit in one area of the plant’s dump, the unit including an inclined conveyor with a steam heater and a receiving hopper. The coal preparation shop receives the wastes in a heated bin, where a screw mixes the wastes with part of the charge for the coking ovens. The mixture subsequently travels along a moving conveyor belt together with the rest of the charge materials. The addition of up to 2% resin-bearing waste materials to the coal charge has not had any significant effect on the strength properties of the coke. __________ Translated from Metallurg, No. 4, pp. 49–50, April, 2007.     

含铁原料造粒粒度预测模型比较

含铁原料造粒粒度预测模型的分析研究,对于优化烧结生产工艺,促进烧结工业的持续高效发展具有重要意义。本文就国内外对造粒粒度预测模型基础研究及目前存在的主要问题进行讨论．根据建模的思路,造粒粒度预测模型可分为质量集合平衡模型和数群集合平衡模型,质量集合平衡模型又可分为单组元和多组元集合平衡模型．研究工作将在质量集合平衡模型的基础上,考虑造粒粒度分布对孔隙度的影响．     

Metallurgical processing,structure and superconducting transition temperature of V3Ga

Alloy compositions, spanning the A15 phase field and the adjacent two phase fields, were arc melted and cast as rods for the study of metallurgical processing, resultant microstructures and superconductivity of V₃Ga. In cast materials, dendritic segregation was observed by metallographic examination and a radial Ga gradient was revealed by inductive super conducting transition temperature measurement. A brief heat treatment at temperatures in the bcc-phase field eliminated the dendritic segregation, decreased the radial Ga gradient, and produced very similar microstructures in the full range of compositions. The fine scale segregation generated in the bcc-to-A15 transformation was removed by an anneal at 1000 to 1150°C. The series of annealed specimens were uniform in microstructure and also in hardness. The lattice parameter-composition plot defined two lines intersecting near the stoichiometric composition. These data and density measurements show that the compositional adjustment is by substitution of V and Ga atoms on lattice sites. The superconducting transition temperature drops rapidly from a maximum as the composition deviates from stoichiometry. Measured values of the zero field transition temperature are somewhat higher than theT _o determined by extrapolating low fieldT _c measurements to zero field. R. W. HUBER, presently retired was with Electronics Technology Division, Naval Research Laboratory, Washington, DC 20375     

Electrochemical processing of the metallic wastes of ZhS32 nickel superalloys

Technological foundations are developed for the electrochemical oxidation of nickel superalloys containing alloying elements Re, Ta, Nb, Co, W, Cr, Mo, and Al. It is shown that nickel, cobalt, and aluminum pass to a sulfuric acid solution when an asymmetric sinusoidal industrial-frequency alternating current is applied and 70–75% tungsten, molybdenum, tantalum, niobium, and rhenium are concentrated in an anode cake. When a nitric acid electrolyte is used, rhenium, nickel, cobalt, aluminum, and chromium pass to a solution and tungsten, molybdenum, tantalum, and niobium are concentrated in an anode cake. Technological versions of the processing of the oxidation products with the formation of marketable products are discussed.     

梅山3^#高炉监控系统和过程计算机系统

梅山３＾＃高炉监控系统和过程计算机系统完成实时数据监控及数据管理功能，在生产中发挥了很大作用，收到了良好的效果。