Recovery of water and solids in a paper mill

Details Recovery of water and solids in a paper mill Recovery of water and solids in a paper mill

D - Textiles, Paper

21

F

D21F 1/66 (2006.01) C01F 11/18 (2006.01) C02F 1/52 (2006.01) C09C 1/00 (2006.01) C09C 1/02 (2006.01) C09C 1/42 (2006.01) D21H 17/01 (2006.01) D21H 17/66 (2006.01) D21H 17/67 (2006.01) D21H 17/69 (2006.01) D21H 19/38 (2006.01)

Patent

CA 2137951

There is disclosed a process for separating fine solids from water in the used water recovery system of a sheet forming mill, wherein the used water recovery system includes at least one stage in which an alkaline earth metal carbonate is precipitated in the aqueous suspension constituting the used water whereby the particulate material present in the used water becomes entrained in the alkaline earth metal carbonate precipitate. By the invention it is possible to recover the water and the fine solid materials which pass through the wire mesh belt of a paper or board forming machine, and optionally recycle those recovered materials.

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