Desulfurization of liquid iron melts
OwnerWolfgang Holzgruberinventor
Life of this patent
Estimating the term…
Abstract
The present invention provides novel desulfurizing agents and a process for desulfurizing liquid iron melts and in particular pig iron melts in the temperature range of between about 1240.degree. C to 1400.degree. C by injecting into the melt, by means of a carrier gas, a prefused or sintered, granulated or pelletized desulfurizing agent comprising a calcium containing material having a liquidus temperature of less than about 1400.degree. C.
Claims17
A process for the desulfurization of pig iron melts having a temperature in the range of between about 1240.degree. C. to 1400.degree. C. comprising forming a desulfurizing liquid slag emulsion in the melt by injecting into the melt, by means of a carrier gas, an agglomerated desulfurizing agent said desulfurizing agent having a liquidus temperature of less than about 1400.degree. C., a particle size of less than about 5.0 millimeters and comprising between about 10 and 60 percent by weight of calcium oxide with the balance comprising at least two other slag-forming constituents, selected from the group consisting of Al.sub.2 O.sub.3, CaF.sub.2, SiO.sub.2, MgO, Na.sub.2 O and heavy metal oxides;
- and wherein Al.sub.2 O.sub.3 may be present in an amount up to 40 percent by weight, CaF.sub.2 up to 70 percent by weight, SiO.sub.2 up to 20 percent by weight, MgO up to 10 percent by weight, Na.sub.2 O up to 40 percent by weight;
- and heavy metal oxides up to 20 percent by weight.
A desulfurizing composition for use in desulfurizing liquid pig iron melts in the temperature range of between about 1240.degree. C. to 1400.degree. C. comprising a fused, granulated composition containing between about 10 and 60 percent by weight of calcium oxide with the balance of the composition comprising at least two other slag-forming constituents, selected from the group consisting of Al.sub.2 O.sub.3, CaF.sub.2, SiO.sub.2, MgO, Na.sub.2 O and heavy metal oxides;
- and wherein Al.sub.2 O.sub.3 may be present in an amount up to 40 percent by weight, CaF.sub.2 up to 70 percent by weight, SiO.sub.2 up to 20 percent by weight, MgO up to 10 percent by weight, Na.sub.2 O up to 40 percent by weight and heavy metal oxides up to 20 percent by weight, said composition having a liquidus temperature of less than about 1400.degree. C. and a particle size of less than about 5.0 millimeters.
Dependencies are inferred from the claim text.