Development of anisotropic texture in co-carbonization of low rank coal with pitch-evaluation from hydrogen donor and acceptor abilities of coal and pitch

✍ Scribed by S. Iyama; T. Yokono; Y. Sanada

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 739 KB
• Volume: 24
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(86)90262-9

✦ Synopsis

The extent of development of anisotropic texture in cokes prepared from various coals or blended coals in co-carbonization systems was assessed by using the ratio of hydrogen donor ability to acceptor ability. A parameter D/A, corresponding to the amount of hydrogen transfer during carbonization in the system of blended coal and pitch additive has been proposed to give a measure of the aforesaid development of anisotropic texture in resultant cokes. In pitch A/non-caking coal systems, blending the pitch A with coal to a value of Di A = 0.22, D/A = 0.28 and D/A = 0.40 gives mainly fine-granted mosaics. medium-grained mosaics and coarse-grained mosaics, respectively. The Gieseler plastometry and high-temperature 'H-NMR were also used to obtain informations about the mobility of the co-carbonization system. A good relation was found between D/A, and the solidification temperature determined by the Gieseler plastometry.

Such an approach based on the concept of D/A parameter provides a guideline for selecting pitch as a modifier for low rank coal carbonization.