Comparative determinations of reactivities of chars, cokes, charcoals and graphite by a thermogravimetric method

✍ Scribed by R.P Donnelly; L.J Brennan; A Rouillard

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 744 KB
• Volume: 49
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(70)90007-4

✦ Synopsis

Reactivities were determined by a method which followed closely the United Nations Published tentative method ST/ECE/Coal/l2 with the added feature that the reaction tube with its inlet and outlet gas connections and internal thermocouple were suspended from an indicating decigram balance. Near rectilinear thermograms were obtained which were used as a basis for calculation of reactivity. The method permitted the comparison of high reactivities of chars with lower reactivities of cokes.

DETERMINATIONS of reactivities towards carbon dioxide of chars from subbituminous coals were required in an investigation of the direct reduction of oxides of iron in ilmenitic beach sands and in iron ores. A thermogravimetric, suspended reaction tube technique, developed in the main investigation, was used for the associated reactivity determinations. The particle sizes of char and the space velocity followed closely the method laid down in United Nations Publication ST/ECE/Coal/ 121. Thermograms of a generally rectilinear form were obtained and reactivities could thus be expressed in rates of carbon loss.