Aspects of the smelting of high-vanadium pig iron

Conclusions The use of CVS in amounts up to 44 kg/ton made it possible to increase the vanadium content of the pig from 0.497 to 0.638% while keeping L_V at the usual level (80–82%). An increase in the percentage of CVS in the charge leads to a moderate increase in the manganese content of the pig. There is almost no change in the concentrations of the other elements, except for phosphorus. Converter slag introduces additional phosphorus into the blast furnace, resulting in an increase in the phosphorus content of the pig iron from 0.038 to 0.043%. The fact that the phosphorus content of the pig in isolated taps was greater than 0.05% can again be attributed to an increase in the amount of phosphorus introduced by the coke and pellets. The use of CVS makes it possible to moderately reduce the consumption of raw limestone in the blast-furnace charge. Chusovoi Metallurgical Plant, AMI Company, and the Institute of Metallurgy (in the Ural Division of the Russian Academy of Sciences) (Ekaterinburg). Translated from Metallurg, No. 7, pp. 18–20, July, 1999.     

The high temperature assessment of raw materials for iron making

Abstract

Methods for assessing burden materials under simulated blast furnace conditions are being developed in several countries for the purposes of international trade, routine quality control, and to assess causes of disturbances in blast furnace operation. Reducibility, low-temperature disintegration and softening-under-load tests are discussed as well as methods of measuring coke reactivity, and some results are presented. Simulation of the blast furnace chemical reserve zone in the Mines Branch Rist Apparatus is also discussed and relationships between test resu1ts and performance in the blast furnace and direct reduction processes are mentioned.

Résumé

Des méthodes de contrôle des matières de chargement sous des conditions simulant celles de la cuve d'un hautfourneau sont en développement dans plusieurs pays pour les besoins des marches internationaux et des contrô1es de qualité de routine et pour évaluer la conduite des hauts-fourneaux. On discute de la réductibilité, de la dégradation granulométrique a basse température et de la résistance mécanique des minerais aussi bien que des méthodes pour mesurer la réactivité du coke; on présente quelques résu1tats. On discute aussi de la simulation de la zone de réserve chimique d'un haut-fourneau dans l'appareil Rist du Bureau des Mines, et on mentionne certaines corrélations entre les résu1tats des essais et les performances de hauts-fourneaux et de certains procédés de réduction directe.     

Methods of improving the quality of desulfurized conversion pig iron

Institute of Ferrous Metallurgy. Translated from Metallurg, No. 6, p. 26, June, 1989.     

电解铝生产中优化磷生铁配方的试验研究

针对240kA铝电解槽阳极组的钢爪和碳块之间浇注压降高低不等，造成生产中设备附加电阻大，浪费电能的状况，通过设计正交试验，优化磷生铁配方，降低了浇注压降，节能效果显著。     

EDTA滴定法测定铅冶炼原料中铅含量结果正确度的探讨

对铅原料中主成分铅的EDTA滴定方法的主要过程进行了剖析,讨论了诸如样品酸溶解方式、硫酸铅沉淀形成条件、沉淀陈化及过滤方式、滤液和不溶渣的测定以及EDTA标准溶液标定等关键要点。对于原料中主要共存干扰元素如碳、硅、铋、钡、锑等的干扰原因和排除干扰方案分别进行了试验和讨论。基于铅冶炼原料的复杂性,对现有国家标准方法的精度要求进行了探讨。探讨关注于测定中影响正确度的因素以及采取相对应的措施,实际证明效果明显,应用于实际样品的分析获得的结果与国家标准方法测定数据一致,对提高EDTA滴定法测定铅含量的正确度具有一定的指导作用。     

New sources of raw materials for iron powder production

Conclusions Ferrous sulfate, obtained upon pickling steel sheet, has proved to be an ideal raw material for the manufacture of iron powders with characteristics of high chemical purity.In the metallurgical industry of Italy, more than 3000 tons of iron powder are obtained annually from ferrous sulfate produced by pickling tanks, i.e., enough to meet the needs of the country.The achieved results and the contemplated plans concerning the qualitative aspect of this production should be evaluated on the basis of the presence of vast reserves of the indicated material and (according to some still general data) the economic efficiency of this process.Translated from Poroshkovaya Metallurgiya, No. 3(75), pp. 101–104, March, 1969.