Zero discharge mill distillation, salt recovery, and water manag

Details Zero discharge mill distillation, salt recovery, and water manag Zero discharge mill distillation, salt recovery, and water manag

1993-10-21

1996-05-21

Lacey, David L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 301, 162 3011, 162DIG8, 423482, 423552, D21C 1100

Patent

active

055185835

ABSTRACT:
In minimizing effluents from a cellulose pulp mill, liquid effluents from a bleach plant are concentrated, and then incinerated to produce a residue including sodium, sulfate, and sodium chloride. This residue is distilled with sulfuric acid to produce gaseous hydrogen chloride and remaining residue, the HCl being used in chloride dioxide production for the bleach plant, while the remaining residue is passed to the recovery loop (e.g. recovery boiler). Sulfur containing gases from the non-condensible gas system may be combusted to produce gaseous sulfur dioxide, which is then converted to sulfuric acid, to distill the residue. Where a non-chlorine bleach plant is provided, the liquid effluents may be concentrated in evaporators and then passed directly to the recovery boiler. The liquid streams in the mill are managed by a cascade principle to reserve the cleanest water for only those processes where it is needed while minimizing its use where it is not necessary.

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Rapson et al. "The Effluent-free Bleached Kraft Pulp Mill", Tappi, vol. 56, No. 9, Sep. 1973, pp. 112-115.
Bertel Myreen, "Closing Up the Bleach Plt . . . Effluent Incorporation", APPITA 1991, pp. 187-191.
Myreen, Bertel, "Closing up the bleach Plant", Jun. 1991.
Mannbro: "Closed-cycle recovery and Combustion of Bleachery Filtrate", Nordic Pulp and Paper Research Journal No. 3/1990, pp. 134-141.
International Search Report.

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