REGENERATION OF HYDROCHLORIC ACID

The specification discloses a process for regenerating aqueous chloride leac h liquors. The process involves roasting aque- ous chloride leach liquor to produce metal oxide and a gas containing HCl. T he gas containing HCl is passed through a precon- centrator where it is contacted with spent aqueou...

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Bibliographische Detailangaben
Hauptverfasser:	MCCLELLAND, ROSS ALEXANDER, HOLLITT, MICHAEL JOHN
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F COMPOUNDS THEREOF DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The specification discloses a process for regenerating aqueous chloride leac h liquors. The process involves roasting aque- ous chloride leach liquor to produce metal oxide and a gas containing HCl. T he gas containing HCl is passed through a precon- centrator where it is contacted with spent aqueous chloride leach liquor. Th e enthalpy of the gas evaporates water from the spent liquor thereby concentrating it. At the same time the spent liquor absorbs HCl. HCl not absorbed in the preconcentrator is con- tacted with water to form hydrochloric acid. The hydrochloric acid may be mixed with the concentrated spent liquor and re-used. Apparatus for operating the process is also disclosed.