Process for recovering pure vanadium oxide

Claim 1

IN A PROCESS OF RECOVERING VANADIUM COMPONDS IN EXCESS OF 99.5% PURITY FROM VANADIUM-BEARING MATERIAL CONTAINING MATERIAL AMOUNTS OF PHOSPHORUS, INCLUDING ROASTING SUCH AS VANADIUM-BEARING MATERIAL MIXED WITH SODIUM CHLORIDE AND IN FINELY DIVIDED CONDITION AT A TEMPERATURE OF ABOUT 800*C. UNDER OXIDIZING CONDITIONS SO AS TO FORM WATER SOLUBLE SODIUM VANADATE SUBSTANTIALLY FREE OF SILICON, IRON, CHROMIUM AND PHOSPHORUS, LEACHING THE ROAST CALCINE WITH WATER AND ESTABLISHING A PH OF ABOUT 5.5 TO 7 IN THE LEACH SOLUTION, AND FILTERING THE LEACHING SLURRY FOR SEPARATION OF THE SODIUM VANADATE SOLUTION FROM INSOLUBLES, THE IMPROVEMENT WHICH COMPRISES EXTRACTING THE ANIONIC VANADIUM OXIDE COMPONENT OF THE SODIUM VANADATE COMPOUND IN THE AQUEOUS LEACH SOLUTION INTO A LIQUID-TO-LIQUID ION EXCHANGE ORGANIC SOLUTION WHICH CONSISTS OF A WATER INSOLUBLE AMINE COMPLEXING AGENT HAVING THREE LONG CHAIN ALIPHATIC HYDROCARGON GROUPS, EACH HAVING 8 TO 10 CARBON ATOMS AND SULFATE IONS IN THE MOLECULE, SAID COMPOUND BEING DISSOLVED IN AN ORGANIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF KEROSENE AND FUEL OIL TO OBTAIN A TWO-PHASE LIQUID MIXTURE, SEPARATING THE ORGANIC PHASE FROM THE AQUEOUS JPHASE CONTAINING METALLIC CATIONIC IMPURTIES INCLUDING MOST OF THE PHOSPHORUS IMPURITIES, DISCHARGING THE SEPARATED AQUEOUS PHASE CONTAINING THE INSOLUBLE IMPURITIES FROM THE TREATMENT, WASHING THE SEPARATED ORGANIC PHASE WITH AN AQUEOUS AMMONIA SOLUTION HAVING A PH OF AT LEAST ABOUT 9 FOR EXTRACTING PHOSPHORUS MATERIAL OF THE ORGANIC PHASE INTO THE AQUEOUS PHASE, SEPARATING THE ORGANIC PHASE FROM THE AQUEOUS PHASE CONTAINING THE PHOSPHOUR MATERIAL, EXTRACTING THE VANADIUM ION FROM THE SEPARATED ORGANIC PHASE BY MIXING WITH AN AQUEOUS SOLUTION CONTAINING AMMONIUM CHLORIDE AND AMMONIA IN QUANTITIES NOT LESS THAN 12% AMMONIUM CHLORIDE BY WEIGHT AND NOT LESS THAN 1% AMMONIA BY WEIGHT TO MAINTAIN A PH OF AT LEAST 8 AND THEREBY FORM A THREE-PHASE MIXTURE OF AN ORGANIC KPHASE, AN AQUEOUS PHASE CONTAINING AMMONIA CHLORIDE AND AMMONIA, AND A SOLID PHASE OF CRYSTALLINE AMMONIUM METAVANDATE IN THE FORM OF A SLURRY IN THE AQUEOUS PHASE, SEPARATING THE AMMONIUM VANADATE FROM THE AQUEOUS JPHASE BY FILTRATION, AND SUBJECTING THE CRYSTALLINE AMMONIUM METAVANADATE TO HEARING TO FORM PURE VANADIUM PENTOXIDE CONTAINING NOT LESS THAN 99.5% V2VO5.