Assessing the quality of iron-ore sinter on the basis of its chemical composition

Autor: Yu. G. Yaroshenko, V. I. Klein, I. S. Bersenev, V. I. Matyukhin
Rok vydání: 2009
Předmět:
Zdroj: Steel in Translation. 39:843-846
ISSN: 1935-0988
0967-0912
DOI: 10.3103/s0967091209100015
Popis: 843 Industrial experience shows that improving product quality is the primary means of reducing production costs and increasing profit. The quality of sinter is basically characterized by the yield of the >5 mm class in a drum sample; and the reducing properties of the sinter. The yield of the >5 mm class reflects the mechanical strength of the initial raw material, which is inversely proportional to the yield of fines. In other words, increase in the yield of acceptable sinter (the >5 mm class) is accompanied by decrease in the quantity of recycled material, increase in productivity, and hence decrease in energy costs. The reducing properties of the sinter correspond to its ability to surrender oxygen to the reducing gas, which, in turn, correlates with the coke consumption in the blast furnace: with increase in reducing properties of the sinter, the coke consumption declines. The sinter quality—strength and reducing properties—corresponds to its metallurgical properties. Sinter quality depends largely on its structure, phase composition, and mineralogical composition. These characteristics, in turn, are directly determined by the content of chemical elements and sintering batch. Such qualitative relations have been noted by many researchers. In the present work, we look for quantitative relations between the given characteristics and sinter quality. This is of great interest not only in determining the cake properties with change in batch composition but also in correcting the composition of the initial material so as to improve the strength and reducing properties of the sinter produced. Experimental determination of the phase composition of individual cake components cannot provide objective information regarding the sinter quality, since individual microvolumes will be characterized by different chemical and phase composition on sintering. Then, with the same heat-treatment conditions, different strength and reducing properties will be observed. In those circumstances, it is not possible to establish a reliable relation between the phase composition of individual sinter samples and the cake characteristics. It would be useful to develop a theoretical model of assessing the quality of iron-ore sinter on the basis of its chemical composition. Information for analysis and prediction of the operating conditions of sintering machines with variation in batch composition may then be obtained by calculating the phase composition of the cake and assessing the cake quality on that basis. There have been numerous attempts to establish
Databáze: OpenAIRE
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