Flowability Assessment of Fine Coals Based on Dynamic Properties [Translated]†

• Main Authors: Keijiro Terashita, Kei Miyanami, Takanobu Konishi, Kazuo Furubayashi
• Format: Article
• Language: English
• Published: Hosokawa Powder Technology Foundation 2014-06-01
• Series: KONA Powder and Particle Journal
• Online Access: https://www.jstage.jst.go.jp/article/kona/4/0/4_1986008/_pdf/-char/en

Flowability assessment of dry and wet fine coals has been attempted on the basis of their dynamic properties such as internal friction factor, shearing cohesiveness and tensile strength. The dynamic parameters have been determined by using a constant load direct shearing tester and a hanging-type split-cell cohesiveness tester. Several kinds of coals with different water contents have been used. The flowability of brown coal is highest with low values of the internal friction factor, shearing cohesiveness and tensile strength. The ranking of flowability is in order of bituminous coal and semi-bituminous coal. The flowability of anthracite is high. The flowability of fly ash is higher when compared to fine coals but it is easily influenced by a slight change in the water content. The flowability of wet fine coals can be better evaluated by the tensile strength and shearing cohesiveness rather than by the internal friction factor. The tensile strength of wet fine coals shows a maximum when a comixture of funicular and capillary zones is formed. The flowability of wet fine coals is controlled by water adsorbed onto the surface of coal particles.† This report was originally printed in J. Soc. Materials Science, Japan, 33(372), 1130-1134 (1984) and 34(386), 1249-1254 (1985) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Materials Science, Japan.