Process for manufacturing a slag conditioning agent for steel desulfurization

10:

• A slag conditioning agent for a process of steel desulfurization, comprising phases of calcium aluminate and an equivalent mass ratio CaO/Al2O3 comprised between 0.55 and 1.5, said slag conditioning agent having an iron content measured by XRF and expressed in equivalent Fe2O3 of at least 2 wt %, and an aluminum content expressed in equivalent Al2O3 of at least 30 wt %.

11:

• The slag conditioning agent according to claim 10, comprising an amount of calcium ferrites measured by XRD of at least 1 wt % relative to the weight of the slag conditioning agent.

12:

• The slag conditioning agent according to claim 10, having a particle size distribution comprised between a minimum value and a maximum value, said minimum value being of at least 1 mm.

13:

• The slag conditioning agent according to claim 10, having a particle size distribution comprised between a minimum value and a maximum value, said maximum value being of maximum 20 mm.

(canceled)

15:

• Use of a slag conditioning agent according to claim 10 in a process of steel desulfurization, at an amount of 2 to 16 kg of slag conditioning agent/ton of steel, in combination with elemental aluminum in amounts less than 100 g/t of steel, and an amount of quicklime of less than 12 kg/t steel.