Abstract
In order to clarify the effect of the MgO/Al2O3 ratio on the fluidity of a low-alumina blast furnace slag system, the influence law of slag fluidity with different MgO/Al2O3 ratios was studied based on the composition of blast furnace slag through a viscosity experiment and themodynamic software. By studying the effect of the MgO/Al2O3 ratio on the activation energy of viscous flow of slag combined with FT-IR, the effect of the MgO/Al2O3 ratio on the thermal-stability of low-aluminum slag was interpreted from the microstructure level. Results indicated that the viscosity and the melting temperature of slag both showed a gradual downward trend due to the increase of the MgO/Al2O3 ratio. Besides, the temperature stability of the low aluminum slag became more stable due to the depolymerization of the complex structure of slag. Considering the actual operating conditions of blast furnace, the MgO/Al2O3 ratio of slag was suggested to be controlled to 0.60 and the basicity to be no higher than 1.20 under the conditions of this investigation. Industrial test results showed that the coke rate could be saved as 3.49 kg/t when the MgO/Al2O3 ratio decreased from 0.70 to 0.58.
Highlights
Since the middle of the 20th century, CO2 as a typical greenhouse gas has become the chief culprit of global warming
Through regression analysis of the viscosity data of different MgO/Al2 O3 ratios and binary basicity of slag, it was found that each increase of 0.1 in the MgO/Al2 O3 ratio decreased the viscosity of the slag by about
This section explored the feasibility of reducing the MgO/Al2 O3 ratio of blast furnace slag based on the results of laboratory research
Summary
Since the middle of the 20th century, CO2 as a typical greenhouse gas has become the chief culprit of global warming. China’s iron and steel industry has always been a large consumer of coal resources due to its long and multiple processes, accounting for 17% of the country’s total coal consumption. The dominant ironmaking route, blast furnace, is an especially energy-intensive process based on fossil fuel consumption; the steel sector is responsible for about 7% of all anthropogenic CO2 emissions. The CO2 emissions of the blast furnace ironmaking process in the iron and steel industry account for approximately 80% of the total CO2 emissions of all processes [1,2,3,4]. The pressure on CO2 emission reduction for the blast furnace ironmaking process is increasing. The carbon in the blast furnace is from coke and pulverized coal injection.
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