Dry Slag Granulation-The Environmentally Friendly Way to Making Cement
In industry,there is a constant drive to reduce energy costs,reduce emissions and ensure maximum re-use of wasted energy.Within the iron- and steel industry,the ironmaking process is the basic component that consumes high amounts of energy and therefore becomes the focus area when the topic of energy saving arises.Much attention has been applied to the Ironmaking process with regard to energy saving and established technologies have been put in place to reach this goal.However,the area which has received the least attention in this regard is slag handling.Throughout the world,approximately 400 million tons of slag at a temperature of around 1500℃ are produced each year.It is generally processed to a by-product without any attempt to utilise the associated lost energy which can arise to approximately 1.5 GJ of energy per ton of slag.A more recent driver for process modernisation is the current focus on reduction of CO2 emissions from the Iron and Steelmaking plant as a whole.The main challenge is to find a way to recover the energy from the slag by a compatible granulation process while producing a product which fulfils all of the quality requirements of the cement industry.Dry granulation requires no subsequent drying of the product in the cement making process leading to a CO2 reduction of roughly 30 kg/t compared with a similar sized wet system.This project is a major R&D exercise now being undertaken by Siemens VAI in conjunction with industrial and scientific partners.This paper will present the concept of a dry slag granulation unit that produces cement grade granulate whilst at the same time allowing energy conservation.It will review the progress to date of this development activity and present ideas on options for energy re-use within the Ironmaking system.
Blast Furnace Slag Dry Granulation Heat Recovery
Ian McDonald Andrea Werner
Siemens VAI Metals Technologies
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-6
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）