Process and plant for grinding spent potlinings and similar materials
AssigneeFcb
InventorFrancis Desrumaux
Life of this patent
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Abstract
The invention relates to aluminium smelters in which the treatment of spent potlinings (carbonaceous products resulting from the demolition of the lining of the walls and bottom of the electrolytic pots) requires a prior reduction of the potlinings into pieces not bigger than a few millimetres in size. The grinding process forming the subject of the invention is characterized in that it includes a crushing operation (12) in which the spent potlinings are reduced into pieces not bigger than 50 mm, a screening operation (16) permitting to separate those drains measuring a few millimetres and constituting the finished product, and a grinding operation (14) permitting to reduce the screen oversize to the finished product dimensions.
Claims15
A method for comminuting spent potlinings comprising the steps of:
- (a) crushing the spent potlinings to reduce them into pieces the majority of which are smaller in size than 50 mm,
- (b) screening the crushed pieces to separate grains smaller in size than 2.5-3 mm, and
- (c) grinding the screened pieces larger in size than 2.5-3 mm in a vibrating cone mill, so as to reduce them to grains most of which are smaller in size than 2.5-3 mm.
A plant for comminuting spent potlinings, comprising:
- (a) a crusher,
- (b) a screening device having a first outlet for undersized products and a second outlet for oversized products,
- (c) means for conveying the crushed products from the crusher to the screening device,
- (d) a vibrating cone mill, and
- (e) means for conveying the oversized products from the second outlet of the screening device to the vibrating cone mill for grinding.
Dependencies are inferred from the claim text.