China Nonferrous Metallurgy

In order to realize the efficient utilization and recovery of molten steel slag waste heat resources and element resources, aiming at the problem of temperature drop caused by heat loss during slag transportation, a two-dimensional heat transfer model of slag-clad interface was established by numerical simulation. The effects of changing the insulation structure of slag cladding and the temperature of baking slag ladle on the temperature drop and insulation effect of slag during slag transportation were studied, and the economic analysis of insulation cladding structure was further carried out. The results show that compared with the traditional slag ladle, the temperature drop of slag can be significantly reduced by using the insulation wall structure, and the slag temperature drop decreased by 42~75℃. The insulation effect of magnesia-alumina spinel castable combination in slag ladle working layer is more obvious than that of magnesia-carbon brick combination, and the temperature drop is reduced by 30℃. The average temperature drop rate of slag edge decreased from 14.11℃/min to 4.26℃/min after preheating of baking slag ladle. The economic analysis results of heat preservation effect of different wall structures show that When the magnesia alumina spinel castable is 120mm, the high alumina castable is 110mm, and the lightweight insulation brick is 20mm are used in slag ladle wall, the economy of heat preservation effect is the best, which can save 195kW·h electric heating, and is beneficial to realize efficient recovery and utilization of slag heat.