Back to results
US 10,174,389 B2Granted
Method for treating desulfurization slag
Assigneevoestalpine Stahl GmbH
InventorsKarl Pilz, Bertram Fritz, Jürgen Antrekowitsch, Gerald Schneeberger
Life of this patent
Estimating the term…
Abstract
A method for treating desulfurization slag involves conveying desulfurization slag from pig iron desulfurization to a unit where the desulfurization slag is melted at a temperature of at least 1,400° C. In the unit, a thorough mixing is achieved. The treatment takes place in the unit under oxidizing conditions. Sulfur dioxide is generated and collected from the roasting gas and supplied for further utilization.
Claims20
A method for treating desulfurization slag, comprising:
- (a) providing desulfurization slag comprising sulfur, from pig iron desulfurization,
- (b) conveying said desulfurization slag to a unit including a burner, said unit assuring a thorough mixing,
- (c) melting the desulfurization slag at a temperature of at least 1,400° C., wherein a λ value of the burner is set to 1.3-1.6 during said melting,
- (d) setting the burner to a λ value greater than 2.0 to generate a roasting gas including SO2,
- (e) collecting the generated SO2, and
- (f) supplying said generated SO2 for further utilization.
3 more elements
A method for treating desulfurization slag, comprising:
- (a) providing desulfurization slag comprising sulfur, from pig iron desulfurization,
- (b) conveying said desulfurization slag to a unit including a burner, said unit assuring a thorough mixing,
- (c) melting the desulfurization slag at a temperature of at least 1,400° C., wherein a λ value of the burner is set to 1.3-1.6 during said melting,
- (d) setting the burner to a λ value greater than 2.0 to generate a roasting gas including SO2, CO and dust,
- (e) afterburning at a temperature of at least 800° C.,
- (f) cooling the roasting gas,
- (g) collecting the generated SO2,
- (h) removing the dust, and
- (i) supplying said generated SO2 for further utilization.
6 more elements
Dependencies are inferred from the claim text.