EP 0000195 B1 19820421 - PROCESS FOR TREATING SLUDGE OR ASHES, ESPECIALLY CLARIFIED SLUDGE SEWAGE OR CLARIFIED SEWAGE ASHES
Title (en)
PROCESS FOR TREATING SLUDGE OR ASHES, ESPECIALLY CLARIFIED SLUDGE SEWAGE OR CLARIFIED SEWAGE ASHES
Publication
Application
Priority
DE 2729277 A 19770629
Abstract (en)
[origin: EP0000195A1] 1. A process for the decomposition of sludges or ashes, in particular clarifying sludges or clarifying sludge ash having a proportion of undecomposed mineral fertilizer components, in particular insoluble phosphate compounds, for fertilizer purposes, characterised in that the sludges or ashes, in particular the clarifying sludges or clarifying sludge ash, are treated at a high temperature up to 1200 degrees C, in the presence of one or more of the compounds Na2 CO3 , CaO, Ca(OH)2 , MgO and MgSO4 , whereby the difficultly-soluble phosphates are converted into phosphate compounds which are highly soluble in water and/or citric acid and which are usable by plants.
IPC 1-7
IPC 8 full level
C05B 13/00 (2006.01); C05D 3/00 (2006.01); C05D 3/04 (2006.01); C05D 9/00 (2006.01); C05F 7/00 (2006.01)
CPC (source: EP)
C05F 7/00 (2013.01); Y02A 40/20 (2017.12)
Designated contracting state (EPC)
BE CH FR LU NL
DOCDB simple family (publication)
EP 0000195 A1 19790110; EP 0000195 B1 19820421; AT 361414 B 19810310; AT A454078 A 19800715; DD 136133 A5 19790620; DE 2729277 A1 19790104; DK 292178 A 19781230; JP S5445272 A 19790410
DOCDB simple family (application)
EP 78100246 A 19780627; AT 454078 A 19780622; DD 20637978 A 19780629; DE 2729277 A 19770629; DK 292178 A 19780628; JP 7847878 A 19780628