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1. 发明授权

EP0656083B1 REDUCTION OF CHLORIDE IN PULPING CHEMICAL RECOVERY SYSTEMS 失效转让
标题翻译：异径氯化物的系统化学品从木材回收融合
公开(公告)号：EP0656083B1
公开(公告)日：1996-03-27
申请号：EP93919759.6
申请日：1993-08-18
申请人： EKA NOBEL AB
发明人： LINDBERG, Hans , SUNDBLAD, Birgitta
IPC分类号： D21C11/04
CPC分类号： D21C11/04 , D21C11/066
摘要： The present invention relates to an environmental-friendly process for reducing the content of chloride in a liquor inventory of a chemical pulp mill. According to the invention, in a recovery system for pulping chemicals containing sulphur and an alkali metal, precipitator dust formed in a recovery boiler is collected and withdrawn, dissolved in water and electrolyzed for production of chlorine or hydrochloric acid in the anolyte. Since the dust normally contains a large amount of sodium sulphate, sulphuric acid and sodium hydroxide can also be produced in the electrolysis. To reduce the content of impurities, before the electrolysis, the pH of the aqueous solution is adjusted to above about 10 to precipitate inorganic substances which are separated-off together with flocculated or undissolved substances.

2. 发明公开

EP0532625A1 PROCESS FOR THE PREPARATION OF AN AQUEOUS SOLUTION OF SODIUM COMPOUNDS 失效
标题翻译： METHOD FOR PRODUCING钠连接的水溶液。
公开(公告)号：EP0532625A1
公开(公告)日：1993-03-24
申请号：EP91911138.0
申请日：1991-05-31
申请人： CHEMREC AKTIEBOLAG
发明人： STIGSSON, Lars , BERNHARD, Nils
IPC分类号： B01D53 , D21C11 , F23J15 , F28C3
CPC分类号： F28C3/06 , D21C11/063 , D21C11/066 , D21C11/122 , D21C11/125 , F28D2021/0075 , Y02P40/44 , Y10S423/03
摘要： Le procédé décrit sert à préparer une solution de composés de sodium qui se forme conjointement à un gaz contenant du monoxyde de carbone, du dioxyde de carbone et de l'hydrogène gazeux, lors de la combustion partielle de bains épuisés de cellulose. Dans ce procédé, le gaz avec sa teneur en composés de sodium est mis en contact avec au moins un liquide dissolvant dans un dispositif composé d'un récipient, contenant un liquide solvant, et d'un tube descendant disposé verticalement (3), dont la partie supérieure est reliée à un générateur de gaz (1) et dont la partie inférieure débouche au dessous de la surface au repos (14) du liquide solvant, le gaz et les composés de sodium descendent à travers le tube descendant (3), dans lequel un liquide dissolvant est ajouté, et passent ensuite entre le tube descendant (3) et un tube montant (6), dont l'extrémité supérieure débouche au dessus de la surface au repos (14) du liquide dissolvant et dont l'extrémité inférieure débouche au dessous de cette surface, le tube montant (6) entourant totalement ou partiellement le tube descendant (3), puis le gaz, les composés de sodium et le liquide dissolvant transporté avec le gaz sont mis en contact, ce qui produit la séparation et la dissolution des composés de sodium dans le liquide dissolvant, lequel est conçu pour la préparation d'un liquide de digestion.

3. 发明公开

EP0261116A1 METHOD OF RECOVERING ALKALINE CHEMICALS FROM FLUE GASES CONTAINING ALKALINE METAL VAPOR 失效转让
标题翻译：程序用于获得氯碱化工废气油烟碱ENTHÄHLT。
公开(公告)号：EP0261116A1
公开(公告)日：1988-03-30
申请号：EP86903387.0
申请日：1986-05-16
申请人： A. AHLSTROM CORPORATION
发明人： KIISKILÄ, Erkki, Johannes
IPC分类号： C01B17 , B01D5 , B01D7 , B01D53 , C01D1 , D21C11
CPC分类号： B01D7/00 , B01D53/002 , D21C11/066 , Y10S423/03 , Y10S423/06 , Y10S423/10
摘要： Procédé d'extraction d'éléments chimiques alcalins à partir d'un matériau contenant des composés de sodium ou de potassium. Le matériau est gazéfié par une source de chaleur extérieure, le gaz étant ensuite rapidement refroidi pour lui permettre d'entrer en contact avec les particules solides refroidies séparées du gaz.

4. 发明公开

EP4428299A1 SYSTEM AND METHOD FOR THE REMOVAL OF NON-PROCESS ELEMENTS FROM ELECTROSTATIC PRECIPITATOR ASHES IN A KRAFT PULP PROCESS 审中-公开
公开(公告)号：EP4428299A1
公开(公告)日：2024-09-11
申请号：EP23160201.2
申请日：2023-03-06
申请人： L'AIR LIQUIDE, SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE
发明人： ARAUJO, Oliveira , CAMPO, Philippe , ALBAN, Bruno , VEIGA, Bruno
IPC分类号： D21C11/06
CPC分类号： D21C11/066
摘要： The present application relates to a system and a method for the removal of non-process elements, such as K+ or Cl-, from electrostatic precipitator ashes in a kraft pulp process comprising the addition of a strong acid containing sulfur and CO2 in separate steps in the ash treatment step.

5. 发明公开

EP2920359A1 METHOD FOR LEACHING RECOVERY-BOILER ASH 有权
标题翻译：浸取回收锅炉灰的方法
公开(公告)号：EP2920359A1
公开(公告)日：2015-09-23
申请号：EP13808059.3
申请日：2013-11-15
申请人： Andritz Oy
发明人： McKEOUGH Paterson
IPC分类号： D21C11/00 , D21C11/12
CPC分类号： D21C11/066 , C22B7/007 , C22B26/10 , D21C11/0007 , D21C11/0064 , D21C11/12 , Y02P40/44 , Y02P70/24
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.
摘要翻译：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。

6. 发明公开

EP1444395A1 PROCESS FOR LEACHING ELECTRICAL FILTER ASH FROM A RECOVERY BOILER 有权
标题翻译：法电除尘器灰从回收锅炉浸出
公开(公告)号：EP1444395A1
公开(公告)日：2004-08-11
申请号：EP02751936.2
申请日：2002-07-23
申请人： Kvaerner Power AB
发明人： WIMBY, Martin , OLAUSSON, Lars , ERIKSSON, Mikael
IPC分类号： D21C11/06
CPC分类号： D21C11/066
摘要： The invention relates to a process for purifying electrical filter ash from chlorides, in particular, by means of leaching and subsequently separating off crystallized substance, which crystallized substance is returned to the process for forming black liquor. A good separation of solid phase in the form of crystalline Na2S04 is obtained by means of a repeated gentle agitation of slurried electrical filter ash in a leaching tank with a total dwell time of between 1 and 5 hours, directly followed by centrifugation of the leached electrical filter ash. The solid phase is supplied to the black liquor prior to final evaporation and/or recovery in the recovery boiler. More than 70 % of the chloride content in the electrical filter ash and 70 % of the potassium content are efficiently leached out, and an improved utilization of process chemicals is obtained.

7. 发明公开

EP1244844A1 PROCESS FOR THE TREATMENT OF FLY ASH, USING HYDROCHLORIC ACID 审中-公开
标题翻译：法粉煤灰酸处理
公开(公告)号：EP1244844A1
公开(公告)日：2002-10-02
申请号：EP00917110.9
申请日：2000-04-07
申请人： FINNISH CHEMICALS OY
发明人： SEPPÄNEN, Reijo
IPC分类号： D21C11/06
CPC分类号： D21C11/066 , Y10S210/928
摘要： The invention relates to a process for the treatment of fly ash accumulating in the electro-filter of the soda recovery unit in a sulfate cellulose mill, the ash containing primarily Na sulfate, Na chloride, Na carbonate and K sulfate, to produce industrial raw materials, in which process the fly ash is dissolved in water, the carbonate present therein is broken down with hydrochloric acid to Na chloride, a sulfate precipitation chemical in chloride form is added, the sulfate precipitate obtained is separated from the solution, and the chloride-containing solution is recovered.

8. 发明公开

EP0935694A1 PROCESS FOR PURIFYING ASH WHICH PRINCIPALLY CONSISTS OF SODIUM SULPHATE FROM A RECOVERY BOILER 失效
标题翻译：用于清洁氯化钠含灰的方法从回收锅炉
公开(公告)号：EP0935694A1
公开(公告)日：1999-08-18
申请号：EP97911542.0
申请日：1997-10-21
申请人： KVAERNER PULPING AB
发明人： WIMBY, Martin
IPC分类号： D21C11
CPC分类号： D21C11/066
摘要： The present invention relates to purifying ash from a recovery boiler by leaching or evaporation-crystallizing contaminants such as, mainly, chlorides and potassium salts in water. The process is characterized in that the leaching or the evaporation-crystallization takes place in an aqueous solution at a temperature of greater than approximately 32 °C, preferably in the vicinity of the boiling point of the aqueous solution, with the leached or evaporation-crystallized ash being returned to the black liquor or to the recovery boiler while the leaching water or the evaporation-crystallization water is then cooled to less than 32 °C, preferably to approximately 10-15 °C, with sodium sulphate containing water of crystallization, such as sodium sulphate heptahydrate or sodium sulphate decahydrate, being crystallized out and then separated in order to be reintroduced into the black liquor, directly into the recovery boiler or into the leaching solution or evaporation-crystallization solution.

9. 发明授权

EP0687323B1 ZERO DISCHARGE MILL DISTILLATION, SALT RECOVERY, AND WATER MANAGEMENT 失效
标题翻译： MILL而不蒸馏，盐类回收和水资源管理排水
公开(公告)号：EP0687323B1
公开(公告)日：1999-03-10
申请号：EP94909414.8
申请日：1993-12-07
申请人： Ahlstrom Machinery Oy
发明人： NYKANEN, Tuomo, S. , GRENWOOD, Brian, F. , GULLICHSEN, Johan , KIISKILA, Erkki , MATTELMAKI, Esko , PHILLIPS, Joseph, R. , RICHARDSON, Jan, T. , RYHAM, Rolf , SODERMAN, Jarmo , WIKLUND, Karl, G.
IPC分类号： D21C11/00 , C02F9/00
CPC分类号： D21C11/0021 , C01B7/01 , C01D1/04 , C01D3/04 , C01D5/00 , C01D7/00 , D21C11/00 , D21C11/0007 , D21C11/0028 , D21C11/066 , D21C11/10 , D21C11/12 , Y10S162/08
摘要： In minimizing effluents from a cellulose pulp mill, liquid effluents from a bleach plant are concentrated, and then incinerated to produce a residue including sodium, sulfate, and sodium chloride. This residue is distilled with sulfuric acid to produce gaseous hydrogen chloride and remaining residue, the HC1 being used in chloride dioxide production for the bleach plant, while the remaining residue is passed to the recovery loop (e.g. recovery boiler). Sulfur containing gases from the non-condensible gas system may be combusted to produce gaseous sulfur dioxide, which is then converted to sulfuric acid, to distill the residue. Where a non-chlorine bleach plant is provided, the liquid effluents may be concentrated in evaporators and then passed directly to the recovery boiler. The liquid streams in the mill are managed by a cascade principle to reserve the cleanest water for only those processes where it is needed while minimizing its use where it is not necessary.

10. 发明公开

EP0754799A3 Leaching process 失效
标题翻译：浸出过程
公开(公告)号：EP0754799A3
公开(公告)日：1997-03-26
申请号：EP96201661.4
申请日：1996-06-14
申请人： Eka Chemicals AB
发明人： Landfors, Johan , Hammer-Olsen, Roy , Häggström, Kimona
IPC分类号： D21C11/06 , D21C11/12
CPC分类号： D21C11/125 , C02F1/469 , D21C11/066
摘要： An increasing problem with the pulping chemical recovery system, is the presence of chloride and potassium in the recovery boiler. Chloride and potassium increase inter alia the stickiness of carryover deposits and dust particles to the recovery boiler tubes, which accelerate fouling, corrosion and plugging of the recovery boiler. As the environmental legislation becomes more stringent, the degree of system closure increases. The present invention relates to a process by which the collected precipitator dust (1) is leached (2), at a temperature exceeding 50°C, for a residence time sufficient to get a chloride and potassium enriched leach solution (4) and to remove at least a part of the content of metal ions in a solid phase (3). Said leach solution is electrochemically treated (5), preferably in an electrodialysis cell, in order to remove at least a part of the chloride and potassium therein. By the present process, the problem of sticky deposits in the recovery boiler can be substantially reduced. This means an improved energy efficiency as well as a higher degree of recovery of the pulping and bleaching chemicals.
摘要翻译：制浆化学回收系统存在的问题是回收锅炉中存在氯化物和钾。氯化物和钾会增加夹带沉积物和灰尘颗粒到回收锅炉管的粘性，这会加速回收锅炉的结垢，腐蚀和堵塞。随着环境立法越来越严格，系统关闭的程度越来越高。本发明涉及一种方法，其中在超过50℃的温度下将收集的沉淀器粉尘（1）浸出（2）足以获得富含氯化物和钾的浸出溶液（4）的停留时间并去除（3）中的至少一部分金属离子的含量。所述浸出溶液电化学处理（5），优选在电渗析池中，以除去其中的至少一部分氯化物和钾。通过本过程，回收锅炉中的粘性沉积物的问题可以大大减少。这意味着改进的能源效率以及制浆和漂白化学品的更高程度的回收率。

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