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公开(公告)号：EP0742783B1
公开(公告)日：1998-12-02
申请号：EP95907664.7
申请日：1995-02-02
发明人： MATTILA, Harri , KENAKKALA, Timo , KONSTARI, Olli
CPC分类号： C02F1/5245 , C01G49/14
摘要： The invention relates to a process of preparing ferric sulfate by forming a slurry which contains ferrous sulfate and sulfuric acid, the slurry containing bivalent iron in both the solution phase and the solid phase, and by oxidizing this slurry to form a ferric sulfate slurry. When so desired, the obtained ferric sulfate slurry is solidified to form solid ferric sulfate. The obtained ferric sulfate may, as such or dissolved in water, be used for the treatment of waste waters or for preparing pure tap water.
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公开(公告)号：EP0742783A1
公开(公告)日：1996-11-20
申请号：EP95907664.0
申请日：1995-02-02
发明人： MATTILA, Harri , KENAKKALA, Timo , KONSTARI, Olli
CPC分类号： C02F1/5245 , C01G49/14
摘要： The invention relates to a process of preparing ferric sulfate by forming a slurry which contains ferrous sulfate and sulfuric acid, the slurry containing bivalent iron in both the solution phase and the solid phase, and by oxidizing this slurry to form a ferric sulfate slurry. When so desired, the obtained ferric sulfate slurry is solidified to form solid ferric sulfate. The obtained ferric sulfate may, as such or dissolved in water, be used for the treatment of waste waters or for preparing pure tap water.
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3.发明授权PROCESS FOR THE PREPARATION OF WATER PURIFICATION SOLUTIONS CONTAINING FERRIC IRON AND THE USE OF THE PRODUCT AS OF OBTAINED 失效PROCESS FOR三价铁解的水处理，并使用如此获得的产品的制备
公开(公告)号：EP0958248B1
公开(公告)日：2002-09-18
申请号：EP97917312.7
申请日：1997-04-15
申请人： KEMIRA CHEMICALS OY
发明人： JOKINEN, Simo , JÄFVERSTRÖM, Stefan , KENAKKALA, Timo , LHOTA, Oliva , TUOMARLA, Juhani , STENDAHL, Kjell
CPC分类号： C01G49/14 , C01G49/009 , C01P2006/10 , C01P2006/80 , C02F1/5245
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4.发明公开PROCESS FOR THE PREPARATION OF WATER PURIFICATION SOLUTIONS CONTAINING FERRIC IRON AND THE USE OF THE PRODUCT AS OF OBTAINED 失效PROCESS FOR三价铁解的水处理，并使用如此获得的产品的制备
公开(公告)号：EP0958248A1
公开(公告)日：1999-11-24
申请号：EP97917312.0
申请日：1997-04-15
申请人： KEMIRA CHEMICALS OY
发明人： JOKINEN, Simo , JÄFVERSTRÖM, Stefan , KENAKKALA, Timo , LHOTA, Oliva , TUOMARLA, Juhani , STENDAHL, Kjell
CPC分类号： C01G49/14 , C01G49/009 , C01P2006/10 , C01P2006/80 , C02F1/5245
摘要： The invention relates to a process for the preparation, from ferrous iron, of solution-form water treatment chemicals which contain ferric iron, to a granulated intermediate product obtained in the process, and to the use of the end products of the process. In the process, a raw material which contains ferrous iron in the form of an aqueous solution and possibly impurities is oxidized at an elevated temperature so that a precipitating, substantially pure ferric compound and a solution phase which contains the said impurities are obtained. The essential idea of the invention is that the precipitation is conducted in such a manner that part of the ferric iron precipitates in the form of goethite FeO(OH) or, in the presence of sulfate ions, in the form of hydronium jarosite H3OFe3(OH)6(SO4)2, while part of the ferric iron remains as a water-soluble ferric compound in the solution phase. Suitable raw materials include impure ferrous sulfate and pickling solutions which contain ferrous chloride. The precipitated pure ferric compound can further be separated by filtration or, alternatively, the slurry can be granulated to form a solid intermediate product and be later reslurried in water, whereupon a pure ferric compound can be separated by filtration. The pure ferric compound is dissolved in an acid, whereupon it is suitable as a coagulant for the purification of drinking water, and the solution phase is suitable as such as coagulant for the treatment of waster water.
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