Slag foaming by carbonates addition: studies of enthalpy and kinetics
Slag foaming phenomena was studied by using calorimetric measures, X-Ray radiography technique and plant data analysis. The kinetics of slag foaming with limestone addition was observed using X-ray camera in a laboratory furnace at 1773 K for the 4 different fraction sizes from 3,0 to less than 0,3 mm. A model for description of limestone decomposition in a slag was proposed based on the assumption of heat transfer as the rate controlling mechanism. The results showed a good agreement between calculated gas evolution rates and experimentally observed changes in foam height for the biggest fraction of limestone (1-3 mm). However, as the fraction size decreases, the observed decomposition time becomes longer than predicted from the model and secondary peak of foam height becomes more evident. Additionally, industrial data from 100-ton EAF were statistically analyzed in order to see the energy effect of both limestone and dolomite addition. The results showed that during liquid bath, when slag foaming is possible and temperature is relatively high, the addition of Ca and Mg carbonates demands only 60-70％ of the theoretical decomposition energy while the addition during scrap melting required almost full amount of energy. The results are in agreement with the previous stage of investigations, where special thermal analysis technique was used for the measurement of total heat balance of slag foaming by carbonate decomposition. The measured energy for dolomite and limestone decomposition was 20-40％ less than theoretical values.
Slag foaming foam model heat transfer limestone decomposition
Andrei CHYCHKO Lidong TENG Seshadri SEETHARAMAN
Currently at PEARL laboratory, Erasteel Kloster AB, S(o)derfors, 81582, Sweden Royal Institute of te Royal Institute of technology (KTH), Stockholm, 10044, Sweden
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-7
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）