SLUDGE THICKENING METHOD, THICK SLUDGE OBTAINED BY THIS METHOD AND SLUDGE THICKENING EQUIPMENT

PROBLEM TO BE SOLVED: To provide a method for selectively thickening a sludge mixture containing ferrous sludge in a phosphate chemical conversion treatment liquid and aluminum-system sludge to high concentrations by the kinds of the metals in the sludge. SOLUTION: This method for thickening the slu...

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Bibliographische Detailangaben
Hauptverfasser:	OGAWA YOSHIKO, MIYAMOTO TOMOSHI, SHIRAISHI MASAJI, USUKI YOSHIO
Format:	Patent
Sprache:	eng
Schlagworte:	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 MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS SEPARATION SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for selectively thickening a sludge mixture containing ferrous sludge in a phosphate chemical conversion treatment liquid and aluminum-system sludge to high concentrations by the kinds of the metals in the sludge. SOLUTION: This method for thickening the sludge includes a process step (1) of transferring the phosphate chemical conversion treatment liquid containing the ferrous sludge and the aluminum-system sludge to a recovering tank, a process step (2) of transferring the liquid out of the recovering tank and a process step (3) of recovering the sludge from the transferred out phosphate chemical conversion treatment liquid. The transfer flow rate to the recovering tank in the process step (1) is regulated in such a manner that the mass ratio of the aluminum-base sludge to the entire part of the sludge in the phosphate chemical conversion treatment liquid is increased after the sludge is transferred out of the recovering tank as compared with the ratio before the transfer to the recovering tank. In addition, the position where the sludge is transferred out of the recovering tank in the process step (2) is set.