Method of filtering molten coal. [filter aids]
Patent
·
OSTI ID:5669381
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 said filter and filtering the solid material so as to form a filter cake on and to pass a filtrate through said filter, directing a stream of inert gas against said filter cake so as to dry the same to a predetermined low moisture content, centrifuging said dried filter cake off said filter, separating from the filter cake a fraction composed of fine particles, adding said separated fine particles to a stream of molten coal upstream of said filter, and passing said stream of molten coal and separated fine particles against said filter, whereby said 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:
- 5669381
- Country of Publication:
- United States
- Language:
- English
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