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1. 发明申请

WO2011002354A1 PROCESS FOR IMPROVED LEACHING OF ELECTROSTATIC PRECIPITATOR ASH FROM A RECOVERY BOILER 审中-公开
标题翻译：改善蒸发锅炉静电浸出液浸出的方法
公开(公告)号：WO2011002354A1
公开(公告)日：2011-01-06
申请号：PCT/SE2009/050493
申请日：2009-05-06
申请人： METSO POWER AB , WIMBY, Martin , NUNES, Joana
发明人： WIMBY, Martin , NUNES, Joana
IPC分类号： D21C11/06 , B01D43/00 , B01D53/74 , B01D53/80
CPC分类号： D21H13/00 , D21C11/06
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.
摘要翻译：本发明涉及一种从氯化物（Cl）和钾（K）中纯化回收锅炉静电除尘器灰（通过19）的方法，并回收有用的制浆化学品如硫酸钠（Na 2 SO 4）。本发明的方法使用两个离心分离级（2a，2b）与每个离心级前面的浸出级（1a和1b）串联。从第一离心分离阶段向第一液体馏分（LF1）排出氯化物和钾，并从第二离心分离阶段送出富含硫酸钠的最终第二干物质（DM2）（24）在白酒回收循环中，在黑液被送入回收过程中混合成黑液，以在制浆过程中再次使用硫酸钠。利用本发明方法，与一步式浸出 - 离心机方法相比，硫酸钠的损失可以显着降低。

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