Recovery and re-use of raw materials from paper mill waste...

Details Recovery and re-use of raw materials from paper mill waste... Recovery and re-use of raw materials from paper mill waste...

D - Textiles, Paper

21

H

D21H 17/01 (2006.01) D21F 1/66 (2006.01)

Patent

CA 2097993

In a process for the recovery and re-use of raw materials from paper mill waste sludge, the sludge is subjected to a preliminary cleaning treatment at a relatively low consistency, thickened to a consistency of 10 to 30%, heated to at least 100°C and then passed through a dispenser in the thickened heated state before being passed. to a papermachine for re-use. Papermaking fibre from at least one other source is mixed with the sludge before and/or after treatment as just described, so that the final paper product typically contains up to 30% of raw materials recovered from sludge. The action of the dispenser is to break up dirt and other debris, and as a result, the recovered raw materials can be re-used in the manufacture of high quality fine papers.

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