公开(公告)号：US20160289793A1

公开(公告)日：2016-10-06

申请号：US14442165

申请日：2013-11-15

申请人： ANDRITZ Oy

发明人： Paterson McKEOUGH

IPC分类号： C22B26/10 ,  D21C9/10 ,  D21C11/00 ,  C22B7/00

CPC分类号： D21C11/066 ,  C22B7/007 ,  C22B26/10 ,  D21C11/0007 ,  D21C11/0064 ,  D21C11/12 ,  Y02P40/44 ,  Y02P70/24

摘要： A method to be used in conjunction with a single-stage or multi-stage process for leaching ash originating from the recovery boiler of a pulp mill, particularly when the ash contains a significant amount of carbonate, wherein calcium compounds, such as calcium oxide (CaO) or calcium hydroxide (Ca(OH)2), are employed as additives in one or more leaching stages, a liquid fraction formed in the leaching process is utilized outside the main chemical recovery cycle, such as a substitute for purchased sodium hydroxide in the bleaching line of the pulp mill, and a solids fraction may be mixed with a black-liquor stream of the mill or subjected to further processing to separate calcium compounds for recycle.

摘要翻译： 一种与用于来自纸浆厂的回收锅炉的沥青的单级或多级方法结合使用的方法，特别是当灰含有大量碳酸盐时，其中钙化合物如氧化钙（ CaO）或氢氧化钙（Ca（OH）2）在一个或多个浸出阶段用作添加剂，在主要化学品回收循环之外使用在浸出过程中形成的液体馏分，例如购买的氢氧化钠 纸浆厂的漂白生产线和固体部分可以与研磨机的黑液流混合或进行进一步加工以分离用于再循环的钙化合物。

公开(公告)号：US20160002853A1

公开(公告)日：2016-01-07

申请号：US14761758

申请日：2014-02-03

申请人： ANDRITZ OY

发明人： Paterson McKEOUGH

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

CPC分类号： D21C11/12 ,  D21C3/022 ,  D21C11/0007 ,  D21C11/0035 ,  D21C11/0085 ,  D21C11/06

摘要： A method used in connection with the recovery of pulping chemicals from spent pulping liquor produced by kraft-type pulping at very high sulphidity. In the method, spent pulping liquor is acidified to a relatively low pH which converts a most or all of the sulphide and hydrosulphide in the liquor to hydrogen sulfide. Sulphur containing gases released from the acidification of the spent pulping liquor, together with other sulphur gases collected at the pulp mill, are converted into an acid compound. This acid compound is employed as an acidification agent in the acidification of the spent pulping liquor. The amount of acid compound generated by the conversion of sulphur containing gases may be sufficient to provide most, if not all, of the acid needed for the acidification of the spent pulping liquor.

摘要翻译： 一种与以非常高的硫化物通过硫酸盐式制浆生产的废浆液回收制浆化学品有关的方法。 在该方法中，将废制浆液酸化至相对较低的pH，将该液体中的大部分或全部硫化物和硫化氢转化为硫化氢。 从废制浆液的酸化中释放的含硫气体以及在纸浆厂收集的其它硫气体被转化为酸化合物。 该酸性化合物在废制浆液的酸化中用作酸化剂。 通过转化含硫气体产生的酸化合物的量可能足以提供大部分（如果不是全部）酸化废制浆液所需的酸。