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Dry Granulation of Molten Slag using a Rotating Multi‐Nozzle Cup Atomizer and Characterization of Slag Particles
Author(s) -
Qin Yuelin,
Lv Xuewei,
Bai Chenguang,
Chen Pan,
Qiu Guibao
Publication year - 2013
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201200325
Subject(s) - granulation , slag (welding) , ground granulated blast furnace slag , nozzle , metallurgy , materials science , particle (ecology) , blast furnace , particle size , composite material , cement , mechanical engineering , engineering , chemical engineering , oceanography , geology
Blast furnace slag is the main byproduct in the ironmaking process, which contains large amounts of sensible heat. In addition, it's the major raw material for cement. However, the sensible heat is wasted not only without any recovery in the traditional water granulation process at this present. The main challenge is to granulate the slag at a high cooling rate while the heat is also being recovered. This paper describes the hot experiments where a rotating multi‐nozzle cup atomizer (RMCA) is used to atomize the molten blast furnace slag without water impingement. The atomization process shows good agreement with Rayleigh's mechanism. The particle size of the slag particle is strongly controlled by the rotating speed and the nozzle diameter, and the higher rotating speed and smaller nozzle diameter are beneficial for obtaining smaller and more uniform slag particles. Moreover, the slag particle still has a high content of glass, which is suitable for cement manufacture.