VERFAHREN ZUR ENTSCHLAMMUNG VON PHOSPHATIERUNGSBAEDERN UND VORRICHTUNG FUER DIESES VERFAHREN

• Main Authors: HARTH,HUBERT,DR, HOSEMANN,KURT, WUEST,WILLI,DR, GOTTWALD,KARL-HEINZ
• Format: Patent
• Language: German
• Published: 29.06.1989
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention relates to a process for desludging phosphatizing baths, in which a part volume of the phosphatizing solution is fed continuously to an apparatus which has three open chambers and in the oxidation chamber of which an O2-containing gas is passed into the solution, after which the resulting iron phosphate sludge is conditioned in the sludge conditioning chamber and is separated off and disposed of in the sedimentation chamber and thereafter the solution having a lower content of layer-forming components is supplemented with aqueous solutions which permit the acidity and the concentration of the layer-forming components to be adjusted to the desired range. The invention also relates to an apparatus for carrying out the process, which has an oxidation chamber 11 having a gassing unit 13, a sludge conditioning chamber 15 and a sedimentation chamber 19, the individual chambers communicating with one another via overflows 14 and 18, and the sedimentation chamber 19 permitting the deposition of the sludge via several partitions 24 arranged essentially parallel to the direction of flow into a sludge nipple 20 having a separate sludge discharge 23.