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Isaenko G.E.,Novolipetsk Metallurgical Combine NLMK | Khaidukov V.P.,Lipetsk State Technical University
Metallurgist | Year: 2012

This articles examines methods of evaluating the degree of granulation of sintering-machine charges of various compositions. The literature contains 14 different criteria for making such an evaluation. The indices that have been proposed are analyzed and are shown to depend on the operating regime of cylindrical balling drums. It is established that the upper and lower coarseness limits for the charge and the length of time that granules close to the upper limit are heated need to be taken into account when choosing a method for evaluating degree of granulation. © 2012 Springer Science+Business Media, Inc.

Kurunov I.F.,Novolipetsk Metallurgical Combine NLMK
Metallurgist | Year: 2012

Global steel production is based on the refining of liquid pig iron in basic oxygen converters. No technologies that do not use liquid pig iron are expected to replace this method in the coming decades, and ore and coal will remain the main raw materials used to make pig iron. Existing technologies that produce liquid pig iron outside the blast furnace are considerably inferior to blast-furnace smelting with respect to productivity and integral total fuel consumption, which includes the fuel costs incurred to produce coke, agglomerated ore-bearing materials, hot blast air, and oxygen. The blast-furnace process is also the leading technology in terms of the scale of production and has the lowest production costs. Not only will the blast furnace retain its lead for the foreseeable future, but there may also be significant reductions in its energy costs and environmental impacts. These improvements might come about as a result of the use of "self-reducing" ore-carbon briquettes made from concentrate and inexpensive carbon-bearing materials. It might also be possible to further intensify the smelting operation through the use of oxygen and increases in top-gas pressure. © 2012 Springer Science+Business Media, Inc.

Filatov S.,Novolipetsk Metallurgical Combine NLMK
Metallurgist | Year: 2015

On November 7th, it will be 80 years since the first ton of pig iron was tapped at the Novolipetsk Metallurgical Combine. Over its eight decades, the combine has gone from being the site of the only blast furnace in Russia to Russia’s largest producer of high-added-value steel and metal rolled products – it accounts for 21% of all steel made in Russia. © 2015 Springer Science+Business Media New York

The Fifth International Congress on the Theory and Technology of Blast-Furnace Smelting, held at Shanghai, China, in October 2008, focused on blast-furnace smelting in China, Japan, North America, Western Europe, and Russia. The first high-capacity blast furnace in China was BF-1 that was erected at a new metallurgical plant of Baosteel. The blast-furnace charge used at the Baosteel plant consists of sinter, pellets, and ore. The blast-furnace shop at Taigang Stainless Steel Co., (TISCO) operated three blast furnaces with volumes of 1800, 1650, and 4350 m3. Japanese blast furnaces recorded the lowest fuel consumption due to the use of high-quality iron-ore agglomerates, coke, and a high blast temperature and optimization of the smelting technology. There were 36 existing blast furnaces that were operating in North America, while the number of integrated metallurgical plants in Western Europe decreased to 26 from 45 and the number of blast furnaces decreased to 58 from 92 between 1990-2008.

Pimenov V.A.,Novolipetsk Metallurgical Combine NLMK | Pertseva V.S.,Novolipetsk Metallurgical Combine NLMK
Metallurgist | Year: 2015

A method has been developed and introduced for determining the characteristics of local thickenings in the cross section of rolled products. The method is based on the mathematical methods of band-pass filtering and the analysis of extremes. The method provides an objective, automatic real-time evaluation of the extent to which the cross section satisfies prescribed criteria. It gives hot-rolling mill operators information for taking corrective actions, gives inspection services data for product certification, and gives technical services results that can be used to analyze and improve the technology. © 2015 Springer Science+Business Media New York

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