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2635122 
Journal Article 
A review of waste heat recovery technologies towards molten slag in steel industry 
Zhang, Hui; Wang, H; Zhu, Xun; Qiu, Y; Li, Kai; Chen, R; Liao, Q 
2013 
Yes 
Applied Energy
ISSN: 0306-2619
EISSN: 1872-9118 
Elsevier 
112 
Elsevier 
956-966 
WOS:000329377800101 
Molten slag exhausted with critically high temperature of about 1450-1550 degrees C is a potential resource of energy and raw materials. Water quenching is a traditional heat recovery technology, which uses cold water to cool down slag so as to achieve the desired glassy by-products. However, this technology consumes a huge amount of water and fails to recover the sensible heat of slag. To save energy and reduce water consumption, some other heat recovery technologies have thus been proposed. Generally, current heat recovery technologies can be classified into physical and chemical methods. Regarding the physical methods, mechanical crushing, air blast and centrifugal granulating process, etc. are widely investigated. With respect to chemical methods, methane reforming reaction and coal gasification process, etc. are proposed. Unfortunately, all these methods cannot fulfill the sustainable requirement. This paper aims to review the proposed granulation and heat recovery technologies. Their working principle, current research status, challenges and future prospects are presented. The waste heat recovery and utilization technologies, which give consideration to both heat recovery rate and cooled slag particles with high quality and high additional value, will be a key to achieve sustainable development for the iron and steel industry. (C) 2013 Elsevier Ltd. All rights reserved. 
Molten slag; Waste heat recovery; Dry granulation technologies; Energy saving; Iron and steel industry