Chemical cleaning of coal by molten caustic leaching after pretr

Details Chemical cleaning of coal by molten caustic leaching after pretr Chemical cleaning of coal by molten caustic leaching after pretr

1988-09-15

1989-08-22

Dees, Carl F.

Fuel and related compositions

Coal treating process or product thereof

Removal of undesirable

423461, C10L 500

Patent

active

048592129

ABSTRACT:
Pretreatment of coal by devolatization at temperatures ranging from about 420.degree. C. to about 450.degree. C. for from about 10 minutes to about 30 minutes before leaching with molten caustic leads to a significant reduction in carbonate formation, greatly reducing the cost of cleaning coal on a per ton basis.

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patent: 4497636 (1985-02-01), Aida et al.
patent: 4545891 (1985-10-01), Meyers et al.
patent: 4661118 (1987-04-01), Thorpe et al.

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