公开(公告)号：EP3495323B1

公开(公告)日：2020-09-09

申请号：EP17205902.4

申请日：2017-12-07

申请人： Borealis Agrolinz Melamine GmbH

发明人： GABRIEL, Herbert ,  DICKE, René ,  MACHL, Doris

IPC分类号： C01F11/38 ,  C01B25/26 ,  C05B11/06

公开(公告)号：EP3495323A1

公开(公告)日：2019-06-12

申请号：EP17205902.4

申请日：2017-12-07

申请人： Borealis Agrolinz Melamine GmbH

发明人： GABRIEL, Herbert ,  DICKE, René ,  MACHL, Doris

IPC分类号： C01F11/38 ,  C01B25/26 ,  C05B11/06

摘要： The invention relates to a process for obtaining a soluble phosphate fraction from a phosphate containing ash, in particular sewage sludge ash (SSA) or meat-and-bone meal ash (MBMA) as phosphate containing material comprising the steps of: a) providing phosphate containing ash; b) digesting the phosphate containing by adding nitric acid, wherein a digestion liquor comprising a soluble phosphate fraction and a soluble calcium fraction is obtained; c) precipitating the soluble calcium fraction from the digestion liquor by crystallizing calcium nitrate from the digestion liquor and providing a suspension containing calcium nitrate crystals and the soluble phosphate fraction; and d) removing the calcium nitrate crystals from the suspension and obtaining a supernatant with the soluble phosphate fraction.