Slag Heat Recovery

In modern blast furnaces around 0.25-0.30 tons of liquid slag with a temperature of approximately 1450°C are produced per ton of pig iron. A number of slag heat recovery systems have been proposed. However none have yet been applied commercially due to technical difficulties that arise in the development of a safe, reliable and energy-efficient system.
 

Development Status Products
Research
iron

Slag Heat RecoveryCosts & Benefits

Parent Process: Blast Furnace System
Energy Savings Potential

Associated energy savings would be approximately 0.35 GJ/t-HM (Worrell et al., 2010. p. 86)
CO2 Emission Reduction Potential

There will be a reduction in CO2 emissions if the recovered heat is adequately utilized.
Costs

Total cost of slag heat recovery including capital and operational expenses is estimated at around $2.5/GJ (Rodd, et al., 2010)

Slag Heat Recovery Publications

Energy Efficiency Improvement and Cost Saving Opportunities for the U.S. Iron and Steel Industry

Date: 

Oct
2010

Source: 

United States Environmental Protection Agency

Format: 

PDF

Type: 

Publications

The U.S. Environmental Protection Agency’s (EPA) energy guide, Energy Efficiency Improvement and Cost Saving Opportunities for the U.S. Iron and Steel Industry, discusses energy efficiency practices and technologies that can be implemented in iron and steel manufacturing plants. This guide provides current real world examples of iron and steel plants saving energy and reducing cost and carbon dioxide emissions.

http://www.energystar.gov/ia/business/industry/Iron_Steel_Guide.pdf?25eb-abc5

Page Number: 

86

Heat Recovery from Melted Blast Furnace Slag using Fluidized Bed

Date: 

May
2012

Format: 

PDF

Type: 

Publications
http://www.processeng.biz/iea-fbc.org/upload/61_3_Shimizu_Slag.pdf

Dry Granulation - a New Sustainable Process for Full Value Recovery from Molten Slags

Date: 

Oct
2011

Format: 

Website

Type: 

Publications
http://www.csiro.au/science/Dry-Slag-Granulation.html

Slag Heat Recovery Resources

Conference of Metallurgists 2010 Preliminary Program

Date: 

Oct
2010

Format: 

PDF
http://www.metsoc.org/com2010/PDFs/Tech-program/sustainability.pdf