Production and Use of Lignite-Based Coke Briquets with High Hot Strength

• Published in: Coke and chemistry (New York, N.Y.) N.Y.), 2018-06, Vol.61 (6), p.213-219
• Main Authors: Stepanov, S. G., Islamov, S. R., Strakhov, V. M.
• Format: Article
• Language: English
• Subjects: Briquets; Chemistry; Chemistry and Materials Science; Coke; Drop tests; Impact tests; Industrial Chemistry/Chemical Engineering; Lignite; Porosity; Wear resistance
• ISSN: 1068-364X; 1934-8398
• DOI: 10.3103/S1068364X18060078

A production technology has been developed for strong briquets (with high CSR and M 25 ) based on coke derived from Kansko-Achinsk lignite. A mixture consisting of lignite coke and binder (Zh and KZh coal) is crushed (to particle size less than 0.2 mm) and mixed with strengthening additive. This blend (57.7% lignite coke + 19.2% binder + 23.1% additive) is shaped into briquets, which are roasted at 1000°C and cooled in the absence of air. For the briquets, CSR = 58.8% and M 25 = 97.4%. The strength in drop tests is 99.1%, and the wear resistance is 99.2%. Technical analysis of the briquets shows that W = 1–2%, A d = 8–10%, V daf = 3–7%, S d = 0.2–0.4%, P d = 0.014%, and C fix = 85–88%. The briquets are characterized by distinctive physicochemical properties, such as high activity with respect to CO 2 ( K C O 2 = 4.6 cm 3 /g s; CRI = 66.1%). Its electrical resistivity ρ = 8 Ω cm for the 3–6 mm size class; and its developed porosity is 50–56%. Applications of the briquets are outlined.