Method of filtering molten coal
Patent
·
OSTI ID:5498921
A process for filtering molten coal is provided. The process comprises the steps of providing a filter, passing a stream of molten coal which includes some solid material against the filter and filtering the solid material so as to form a filter cake on and to pass a filtrate through the filter, directing a stream of inert gas against the filter cake so as to dry the same to a predetermined low moisture content, centrifuging the dried filter cake off the filter, separating from the filter cake a fraction composed of fine particles, adding the separated fine particles to a stream of molten coal upstream of the filter, and passing the stream of molten coal and separated fine particles against the filter. The fine particles act as a filter aid for the filtration of the molten coal. The process can also comprise adding calcium oxide or an inorganic salt to a stream of molten coal whereby the added compound acts as a filter aid, and subsequently recovering the added compound and again adding it to a stream of another coal.
- Assignee:
- Chemap AG
- Patent Number(s):
- US 4157305
- OSTI ID:
- 5498921
- Country of Publication:
- United States
- Language:
- English
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