Characterization of blast furnace slag particles generated by nitrogen jet granulation. (3rd March 2022)

• Record Type: Journal Article
• Authors: Yang, Xiaoxiao; Zhou, Hui; Li, Qinghai; Tan, Zhongchao; Zhang, Yanguo
• Is Part Of: Canadian journal of chemical engineering. Volume 100:Number 12(2022)
• Page Start: 3600
• Page End: 3607
• Publication Date: 2022-03-03
• Subjects: blast furnace slag -- dynamic deformation -- flying speed -- jet granulation -- sphericity; Chemical engineering -- Periodicals; Technology -- Periodicals; 660.05
• DOI: 10.1002/cjce.24375
• Languages: English
• ISSNs: 0008-4034

Abstract

Abstract: This paper reports an experimental study on the changes in the equivalent diameter and sphericity of flying molten slag particles in terms of heating temperature and nitrogen injection pressure. A high‐speed camera is used to continuously take images of the flying molten particles. Then the images are analyzed by mathematical image processing. With increasing heating temperature, the lower the viscosity, the stronger the fluidity, and the easier it is to be granulated into small particles under the spray of nitrogen. The results show that the equivalent diameter and sphericity of the particles with equivalent diameters remain the same during the flight. During the granulation of the particles, however, rod‐shaped particles gradually change to spherical ones, and the sphericity keeps increasing until it reaches a level. The average flying speed of the studied slag particles at the temperatures of 1400, 1450, 1475, 1500, and 1510°C is 4.0, 4.3, 4.5, 4.3, and 4.2 m/s, respectively. In addition, the higher the temperature, the longer the flight distance of the particles. By changing the gas injection pressure to 0.2, 0.3, 0.4, and 0.5 MPa, the average flying speeds of the studied slag particles are 2.8, 3.7, 5.5, and 8.4 m/s, respectively. This result proves that the higher the injection pressure, the greater the average flying speed of the particles.