![METHOD FOR LEACHING RECOVERY-BOILER ASH](/ep/2015/09/23/EP2920359A1/abs.jpg.150x150.jpg)
基本信息:
- 专利标题: METHOD FOR LEACHING RECOVERY-BOILER ASH
- 专利标题(中):浸取回收锅炉灰的方法
- 申请号:EP13808059.3 申请日:2013-11-15
- 公开(公告)号:EP2920359A1 公开(公告)日:2015-09-23
- 发明人: McKEOUGH Paterson
- 申请人: Andritz Oy
- 申请人地址: Tammasaarenkatu 1 00180 Helsinki FI
- 专利权人: Andritz Oy
- 当前专利权人: Andritz Oy
- 当前专利权人地址: Tammasaarenkatu 1 00180 Helsinki FI
- 代理机构: Hoffmann Eitle
- 优先权: FI20126204 20121116
- 国际公布: WO2014076361 20140522
- 主分类号: D21C11/00
- IPC分类号: D21C11/00 ; D21C11/12
摘要:
The subject of the invention is a new 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. In the method, calcium compounds, most preferably calcium oxide (CaO) and/or calcium hydroxide (Ca(OH)2), are employed as additives in one or more leaching stages. The liquid fraction formed in the leaching process is utilized outside the main chemical recovery cycle, preferably as a substitute for purchased sodium hydroxide in the bleaching line of the pulp mill. The solids fraction may be mixed with a black-liquor stream of the mill or subjected to further processing in order to separate calcium compounds for recycle.
摘要(中):
本发明的主题是与用于沥滤来自纸浆厂的回收锅炉的灰分的单阶段或多阶段方法结合使用的新方法,特别是当灰分含有大量碳酸盐时。 在该方法中,在一个或多个浸出阶段中使用钙化合物,最优选氧化钙(CaO)和/或氢氧化钙(Ca(OH)2)作为添加剂。 浸出过程中形成的液体部分在主化学回收循环之外使用,优选作为纸浆厂漂白生产线中购买的氢氧化钠的替代品。 固体部分可与磨机的黑液流混合或进行进一步处理以分离用于再循环的钙化合物。
公开/授权文献:
- EP2920359B1 METHOD FOR LEACHING RECOVERY-BOILER ASH 公开/授权日:2016-09-14