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Properties of new formed fuels for iron ore sintering process DOI:


  The article presents the compressive strength test results of fuel composite intended for application in the processes of iron ore sintering production. In various mixtures there was examined the effect of the fragmentation degree and the mass fraction of the fragmented carbon fraction and moisture content of the fuel moulded shapes on its compressive strength. On the basis of the study analysis, it can be concluded that with decreasing average Sauter diameter of the micronized coal fraction, the strength of fuel moulded shapes increased, with the highest strength obtained for particle size distribution of d32 = 4.18 microns; Fig. 2c and the moisture content of about 3% by weight, Fig. 4. The in- crease of the carbon mass fraction of about d32 = 4.18 microns in the mixture resulted in an increase in the strength of the fuel moulded shapes.Introduction. In a number of pyrometallurgical processes, in addition to metalliferous material, basic component of the feed is coke, coke breeze or anthra- cite. Mainly they play the role as an energy carrier and reductant. For many years, research has been carried out in a wide range of applications of cheaper alter- natives to these materials in metallurgical aggregates. This applies to the process of sintering ore, blast furna- ce process, non-ferrous metal smelting process in shaft furnaces and processing technologies of various kinds of secondary metallurgical raw materials [1÷4]. As alternative fuel for metallurgical processes there are used coal-bearing fine-grained fractions from coal enrichment process, coke waste and biomass. Some of them have already found a wide range of highly suc- cessful application e.g. in the energy sector. [5]. It sho- uld be pointed out that a major problem of these pro- cesses is the emission of pollutants in the form of dust, CO2, SO2, CO, NOx and other products of incomplete combustion, which is particularly harmful to the envi- ronment. One way to improve t[...]

Badania wpływu stopnia rozdrobnienia kamienia wapiennego na jego reaktywność w procesie mokrego odsiarczania spalin

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Przedstawiono wyniki badań wpływu rozdrabniania kamienia wapiennego na jego reaktywność w procesie odsiarczania spalin mokrą metodą wapienną. Sorbent rozdrabniany był na mokro w mieszalniku rozdrabniającym z dwoma, umieszczonymi acentrycznie mieszadłami. W trakcie badań uzyskano rozdrobnienie kamienia wapiennego wynoszące do 32/d32 = 44,08/1,26 = 35, dzięki czemu osiągnięto 5,5-krotny wzro[...]

THE INFLUENCE OF THE TYPE OF GAS ATMOSPHERE ON THE SPEED OF THE EVAPORATION PROCESS METALLIC BATH INGREDIENTS DOI:10.15199/67.2018.11.1


  INTRODUCTION The evaporation process is an example of a heterogeneous process running in the in the system of liquid metallic phase - gaseous phase. From the kinetic point of view, the evaporation process of a pure "Me" metal could be parted on two main stages, that means: ?? evaporation from the interphase surface liquid metal- gaseous phase, ?? transport of a metal vapour mass from the interphase surface deeper in the gaseous phase. When Me metal is evaporating as a volatile ingredient of metallic bath (liquid alloy), there is an additional stage of the analysed process - the transport of this ingredient from the liquid phase core to the interphase surface. Both of these cases are presented schematically on the Fig 1. Transport of a mass in the liquid phase and in the gaseous phase as well in the hydrodynamic conditions prevailing in metallurgical aggregates takes place on the way of convection, very rarely on the way of diffusion. The Me metal mass stream of evaporating ingredient of an alloy from the depth of the liquid phase to the interphase surface on which there are a physical transformation liquid metal - metal vapour, what can be described by the dependence: NMe l =βMe l (CMe l -CMe s ) (1) where: βMe l - index of Me metal mass transport from the liquid phase core to the interphase CMe l - Me metal concentration in the liquid phase core CMe s - Me metal concentration by the interphase surface Fig. 1. The scheme of "Me" metal: a - as a pure metal, b - as an ingredient of an alloy Rys. 1. Schemat parowania metalu "Me: a - jako czystego metalu, b - jako składnika stopu Rudy Metale 2018, R. 63, nr 11 4 The Me metal vapour mass stream evaporating from the interphase Surface is defined by dependence: NMe e =kMe e (pMe eq -pMe s ) (2) where: kMe e - Me metal evaporation rapid constant pMe eq - equilibrium Me metal resilience by the metallic bath pMe s - actual Me metal resilience by the me[...]

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