Low-rank coal oil agglomeration product and process
A selectively-sized, raw, low-rank coal is processed to produce a low ash and relative water-free agglomerate with an enhanced heating value and a hardness sufficient to produce a non-degradable, shippable fuel. The low-rank coal is treated, under high shear conditions, in the first stage to cause ash reduction and subsequent surface modification which is necessary to facilitate agglomerate formation. In the second stage the treated low-rank coal is contacted with bridging and binding oils under low shear conditions to produce agglomerates of selected size. The bridging and binding oils may be coal or petroleum derived. The process incorporates a thermal deoiling step whereby the bridging oil may be completely or partially recovered from the agglomerate; whereas, partial recovery of the bridging oil functions to leave as an agglomerate binder, the heavy constituents of the bridging oil. The recovered oil is suitable for recycling to the agglomeration step or can serve as a value-added product.
- DOE Contract Number:
- FC21-86MC10637
- Assignee:
- Univ. of North Dakota School of Engineering Mines Foundation, Grand Forks, ND (United States)
- Patent Number(s):
- US 5162050; A
- Application Number:
- PPN: US 7-729461
- OSTI ID:
- 7206494
- Resource Relation:
- Patent File Date: 12 Jul 1991
- Country of Publication:
- United States
- Language:
- English
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Low-rank coal oil agglomeration
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