Preparation of refined coal oil-water slurry by blending coal tar with ultra-clean coal filter cake

ABSTRACT

A novel process for the preparation of a refined coal oil-water slurry from coal tar and an ultra-clean coal filter cake prepared by flotation is presented. The effects of the filter cake water content and coal tar addition on the slurry performance are investigated. The results show that the slurry viscosity decreases and the stability increases with the increasing coal tar content. The viscosity and stability of the slurry decrease with increasing filter cake moisture. The best proportion is 50% coal tar and 40% filter cake moisture. Under these conditions, the high calorific value of the slurry is 28.36 MJ·kg⁻¹, the apparent viscosity is 522.9 mPa·s, and the water bled rate is 3.6%. The slurry has the characteristics of shear thinning and is a pseudoplastic fluid. In this research, coal tar is selected as the oil phase, and there is no need to add an additional water phase in the pulping process. The recovery and utilization of the coal pyrolysis byproducts are realized, and the suction filtration and drying of the flotation ultra-clean coal concentrate products are simplified.

KEYWORDS:

• Ultra-clean coal
• filter cake
• refined coal oil-water slurry
• coal tar
• coal slurry fuel

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors acknowledge the financial support from the Anhui Provincial Department of Education (number KJ2021A0971, 2022AH030143).

Notes on contributors

Jinting Liu

Jinting Liu School of Chemical & Material Engineering, Huainan Normal University, Dongshan West Road, Huainan City, Anhui E-mail address: [email protected] Jinting Liu, Ph.D. Her research fields are mainly related to the clean utilization of coal. Especially the effect of mechanochemistry on coal structure, and on coal desulfurization.

Jing Zhao

Jing Zhao Corresponding author School of Chemical & Material Engineering, Huainan Normal University, Dongshan West Road, Huainan City, Anhui E-mail address: [email protected] Jing Zhao, Ph.D. I have published several high-quality papers, mainly on the separation of ultra-pure coal and its mechanism research.

Yunhu Hu

Yunhu Hu School of Chemical & Material Engineering, Huainan Normal University, Dongshan West Road, Huainan City, Anhui E-mail address: [email protected] Yunhu Hu, Ph.D. He has published several high-quality papers, focusing on the upgrading of low-rank coal and the research on groundwater treatment in mining area.

Jingyun Hou

Jingyun Hou School of Chemical & Material Engineering, Huainan Normal University, Dongshan West Road, Huainan City, Anhui E-mail address: [email protected] Jingyun Hou, P.G. Her research direction is the computer processing of mineral images.