Method for minimizing pulp mill effluents
    1.
    发明授权
    Method for minimizing pulp mill effluents 失效
    减少纸浆厂废水的方法

    公开(公告)号:US5374333A

    公开(公告)日:1994-12-20

    申请号:US922334

    申请日:1992-07-30

    IPC分类号: D21C9/10 D21C11/00 D21C11/12

    CPC分类号: D21C11/0021 Y10S162/08

    摘要: Apparatus for a pulp and paper mill, and methods of acting on liquid effluents produced in the mill, which minimizes the discharge of polluting gaseous and liquid effluents to the environment. Liquid effluents from the bleach plant are concentrated (e.g. evaporated), incinerated (e.g. gasified), leached, crystallized (e.g. freeze crystallized) then washed, and then fed to the plant chemical recovery loop. White liquor produced from the recovery boiler melt is fully oxidized and used in place of caustic in the bleach plant. Essentially all sulfuric acid, sulfur dioxide, caustic, and chlorine dioxide necessary for the pulp mill is produced from mill liquid effluents and gas waste streams, on site at the pulp mill. Typical bleaching sequences that can be used are DE.sub.op D.sub.n D, or AZE.sub.o PZP.

    摘要翻译: 用于纸浆和造纸厂的设备,以及作用于在磨机中产生的液体流出物上的方法,其最大限度地减少污染的气态和液体流出物排放到环境中。 来自漂白设备的液体流出物被浓缩(例如蒸发),焚化(例如气化),沥滤,结晶(例如冷冻结晶),然后洗涤,然后进料至植物化学回收循环。 从回收锅炉熔体产生的白液被完全氧化并用于漂白设备中的苛性碱。 纸浆厂所必需的硫酸,二氧化硫,苛性碱和二氧化氯基本上都是从磨浆液流出物和废气流中产生的。 可以使用的典型漂白序列是DEopDnD或AZEoPZP。