·In tonnage terms blast furnace slag is at present the main type followed by slags from the Basic Oxygen Steelmaking BOS and Electric Arc Furnace EAF processes Various other processes such as external desulphurisation of steel may generate significant amounts of slag at some plants but overall they are only a small proportion of the total
·Qiu et al [8] carried out experiments of sodium hydroxide steel slag double alkali method of sintered flue gas desulfurization in a bubbling reactor and found that the desulfurization rate could be maintained above 80 % for a long time under the optimal conditions and the sodium hydroxide steel slag double alkali method of
·High temperature waste heat from the iron and steel industry as shown in Fig 1 are mainly stored in products molten slag and waste gas [2] Molten slag as a kind of by product during the steelmaking process is exhausted in extremely high temperature and thus it carries a great deal of high grade heat accounting for 10% of waste energy in steel industry and 35% of
·Waste heat recovery from high temperature slags represents the latest potential way to remarkably reduce the energy consumption and CO2 emissions of the steel industry
·Slags are valuable by products of iron and steelmaking processes Their efficient reutilization and the recuperation of their thermal energy are key for improving the overall efficiency of these processes With the innovative approach presented in this work it is possible to recover thermal heat from liquid slags The process concept consists of a slag tundish and four
·1 INTRODUCTION Blast furnace slag BFS and steel slag SS as industrial solid wastes produced in the process of steel making account for 80% 90% of the total smelting slag [] BFS accounts for about 30% of pig iron output [] while SS accounts for 10% 15% of the crude steel output [] SS comprises various slags including basic oxygen furnace slag BOFS
·The microstructure and phase composition of steel slag are analyzed and compared before and after the mineralization process using SEM XRD TG DTA and particle size analysis Composite mineral admixtures were prepared by mixing steel slag and granulated blast furnace slag to replace 50 % cement
In modern EAF operations especially those operating with a hot heel of molten steel and slag retained from the prior heat oxygen is often blown into the bath throughout the heat and oxygen are all used to react with impurities that create a slag pool which can then be separated and removed from the molten refined steel Fig 6
·Modern industrialization leads to an increasing demand for steel around the world the production of one ton of crude steel generates a substantial amount of steel slag SS 1 ranging from 130 200 accumulation of SS poses economic and environmental challenges particularly in developing countries with low utilization rates
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