Method and system for recovering coal fines from pipe line coal slurry
A method and system for dewatering coal fines from the concentrate of a pipeline slurry centrifuge, to recover the coal and purify the water, includes blending the concentrate from the centrifuge with slurry from the pipeline in the proportion of about 4:1. The blend is chemically conditioned with an agglomerating polymer, and then dewatered on a belt press. The cake from the belt press is dry enough to burn in the boiler, and the filtrate is clarified in a gravity clarifier. The clarifier effluent is clean enough for plant purposes or to return to the environment, and the clarifier underflow is returned to the blend for dewatering in the belt press. In a second embodiment, the blend is dewatered directly in a disphragm filter press without chemical conditioning, and the filtrate is clean enough to use directly without clarifying.
- Assignee:
- Rexnord Inc.
- Patent Number(s):
- US 4544490
- OSTI ID:
- 5849311
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
ACIDIFICATION
BOILERS
CARBONACEOUS MATERIALS
CENTRIFUGES
COAL
COAL FINES
COAL PREPARATION
CONCENTRATORS
DEHYDRATION
DISPERSIONS
ENERGY SOURCES
FABRICATION
FOSSIL FUELS
FUEL SLURRIES
FUELS
HYDRAULIC TRANSPORT
MATERIALS
MATERIALS WORKING
MIXING
MIXTURES
POLYMERS
PRESSING
PULVERIZERS
RECOVERY
REMOVAL
SEPARATION PROCESSES
SLURRIES
SUSPENSIONS
TRANSPORT
WATER REMOVAL