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Microwave-assisted selective leaching behavior of calcium from Basic Oxygen Furnace (BOF) slag with ammonium chloride solution
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The Basic Oxygen Furnace (BOF) slag can be potentially used in the indirect
aqueous CO2 sequestration process due to the fact that it contains large
amounts of basic oxides. In this study, microwave-assisted selective leaching
of calcium from BOF slag with ammonium chloride solution has been
investigated in order to improve the extraction efficiency of calcium ion,
and reduce leaching time and the contents of impurity ions in the leachate.
The results show that the major phases of BOF slag, such as Ca2SiO4, Ca3SiO5
and Ca2Fe2O5, can react with ammonium chloride solution. The microwave power
has significant effects on the leaching ratio of calcium ion from the BOF
slag. After microwave-assisted leaching treatment, the internal tiny cracks
can be found inside the BOF slag particles. The leaching ratio of calcium ion
can be up to 90 % with small amounts of impurity ions existed in the
leachate. The non-isothermal leaching reactions are controlled by internal
diffusion and the apparent activate energies are estimated to be 6.9-26.5
kJ/mol.
Title: Microwave-assisted selective leaching behavior of calcium from Basic Oxygen Furnace (BOF) slag with ammonium chloride solution
Description:
The Basic Oxygen Furnace (BOF) slag can be potentially used in the indirect
aqueous CO2 sequestration process due to the fact that it contains large
amounts of basic oxides.
In this study, microwave-assisted selective leaching
of calcium from BOF slag with ammonium chloride solution has been
investigated in order to improve the extraction efficiency of calcium ion,
and reduce leaching time and the contents of impurity ions in the leachate.
The results show that the major phases of BOF slag, such as Ca2SiO4, Ca3SiO5
and Ca2Fe2O5, can react with ammonium chloride solution.
The microwave power
has significant effects on the leaching ratio of calcium ion from the BOF
slag.
After microwave-assisted leaching treatment, the internal tiny cracks
can be found inside the BOF slag particles.
The leaching ratio of calcium ion
can be up to 90 % with small amounts of impurity ions existed in the
leachate.
The non-isothermal leaching reactions are controlled by internal
diffusion and the apparent activate energies are estimated to be 6.
9-26.
5
kJ/mol.
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