发明公开
EP2427598A1 PROCESS FOR IMPROVED LEACHING OF ELECTROSTATIC PRECIPITATOR ASH FROM A RECOVERY BOILER
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基本信息:
- 专利标题： PROCESS FOR IMPROVED LEACHING OF ELECTROSTATIC PRECIPITATOR ASH FROM A RECOVERY BOILER
- 专利标题（中）：FOR电除尘器灰浸出改进方法从回收锅炉
- 申请号：EP09846901.8 申请日：2009-05-06
- 公开(公告)号：EP2427598A1 公开(公告)日：2012-03-14
- 发明人： WIMBY, Martin , NUNES, Joana
- 申请人： Metso Power AB
- 申请人地址： P.O. Box 8734 402 75 Göteborg SE
- 专利权人： Metso Power AB
- 当前专利权人： VALMET AKTIEBOLAG
- 当前专利权人地址： VALMET AKTIEBOLAG
- 代理机构： Andréasson, Ivar
- 国际公布： WO2011002354 20110106
- 主分类号： D21C11/06
- IPC分类号： D21C11/06 ; B01D43/00 ; B01D53/74 ; B01D53/80
摘要：
The invention relates to a process for purifying recovery boiler electrostatic precipitator ash (via 19) from chlorides (Cl) and potassium (K), and recover useful pulping chemicals such sodium sulphate (Na
2 SO
4 ). The inventive process uses two centrifugal separation stages (2a, 2b) in series with a leaching stage (1 a and 1 b) ahead of each centrifugal stage. The chlorides and potassium is bled out (26) with the first liquid fraction (LF1 ) from the first centrifugal separation stage and the final second dry matter substance (DM2) with enriched sodium sulphate content from the second centrifugal separation stage is sent (24) to the liquor recovery cycle, mixed into black liquor before the black liquor is being sent to the recovery process for reuse of the sodium sulphate in the pulping process. With the inventive process losses of sodium sulphate could be reduced significantly compared to a one stage leach-and-centrifuge process.
2 SO
4 ). The inventive process uses two centrifugal separation stages (2a, 2b) in series with a leaching stage (1 a and 1 b) ahead of each centrifugal stage. The chlorides and potassium is bled out (26) with the first liquid fraction (LF1 ) from the first centrifugal separation stage and the final second dry matter substance (DM2) with enriched sodium sulphate content from the second centrifugal separation stage is sent (24) to the liquor recovery cycle, mixed into black liquor before the black liquor is being sent to the recovery process for reuse of the sodium sulphate in the pulping process. With the inventive process losses of sodium sulphate could be reduced significantly compared to a one stage leach-and-centrifuge process.
公开/授权文献:
IPC结构图谱:
| D | 纺织；造纸 |
| --D21 | 造纸；纤维素的生产 |
| ----D21C | 从含纤维素原料中除去非纤维素物质生产纤维素；制浆药液的再生；所需设备 |
| ------D21C11/00 | 制浆药液的再生 |
| --------D21C11/06 | .制浆废气的处理；废气热量的回收 |