Effect of parameters on reduction behaviour of preheated converter sludge pellets in grate-rotary kiln process. (9th August 2018)

• Record Type: Journal Article
• Authors: Long, Hu; Jia, Yan Zhong; Liang, De Lan; Bai, Ming Hua; Ren, Su Bo
• Is Part Of: Ironmaking & steelmaking. Volume 45:Number 7(2018)
• Page Start: 672
• Page End: 677
• Publication Date: 2018-08-09
• Subjects: Converter sludge -- coal-based direct reduction -- metallisation degree -- compressive strength -- orthogonal; Iron industry and trade -- Periodicals; Steel industry and trade -- Periodicals; 669.1
• DOI: 10.1080/03019233.2017.1319540
• Languages: English
• ISSNs: 0301-9233

Abstract

ABSTRACT: Effects of parameters including temperature, time and coal ratio on the reduction behaviour of preheated iron-bearing converter sludge pellets in a simulated rotary kiln are studied through orthogonal tests. ANOVA analyses show that reduction time and temperature have remarkable influence on the metallisation degree, occupying 55.02 and 30.08% of the total contribution, while temperature is the most significant factor affecting the compressive strength, with 90.98% contribution. The metallisation degree increases with the increasing time from 1.5 to 2.5 h, and first increases and then decreases with the increasing temperature from 1000 to 1100°C. The compressive strength increases with the increasing temperature. Under the optimal condition of temperature 1050°C, time 2.5 h, coal ratio 1.3, the metallisation degree is 72.92%, and the compressive strength is 1310 N/p, which satisfies the requirement of iron burden for blast furnace.