Abstract 1. IN A METHOD OF RECOVERING ACID LEACHABLE VANADIUM VALUES FROM VANADIFEROUS OIL SHALE HAVING A HIGH CONTENT OF CALCIUM CARBONATE COMPRISING THE STEPS OF: (A) RETORTING SAID SHALE AT A TEMPERATURE BETWEEN ABOUT 100*C. AND POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE POLYMERS AND VINYLIDENE CHLORIDE POLYMERS; (B) EVAPORATING THE SOLVENT AT A TEMPERATURE BELOW 80* C. TO THEREBY FORM A MEMBRANE; ABOUT 500*C. TO VOLATILIZE THE OIL SUBSTANTIALLY COMPLETELY THEREFROM AND TO FORM SPENT SHALE HAVING A RESIDUAL ORGANIC SOLVENT AND CONTAINING SAID CALCIUM CARBONATE AND VANADIUM VALUES, (B) ROASTING THE SPENT SHALE AT A TEMPERATURE BETWEEN ABOUT 500*C. AND ABOUT 800*C. TO COMBUST THE RESIDUAL ORGANIC CONTENT AND TO FORM SHALE ASH CONTAINING SAID CALCIUM CARBONATE AND VANADIUM VALUES, (C) FORMING AN AQUEOUS SLURRY OF THE SHALE ASH, AND (D) LEACHING THE VANADIUM VALUES FROM THE SHALE ASH BY BEDUCING THE PH OF THE AQUEOUS SLURRY TO A FINAL VALUE BELOW 6; THE IMPROVEMENT WHICH COMPRISES SAID REDUCTION TO A FINAL PH VALUE BELOW 6 BEING EFFECTED BY INTRODUCING INTO THE AQUEOUS SLURRY AS AN ACID GAS SULFUR DIOXIDE AND CARBON DIOXIDE OR SULFUR DIOXIDE, CARBON DIOXIDE, NITROGEN AND OXYGEN, WHEREBY SAID VANADIUM VALUES ARE LEACHED FROM THE SHALE ASH WITHOUT DISSOLVING A SUBSTANTIAL AMOUNT OF THE CALCIUM CARBONATE.
Inventors
👤 B Hardwick
👤 J Patterson
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-08 12:00
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
214 words
IN A METHOD OF RECOVERING ACID LEACHABLE VANADIUM VALUES FROM VANADIFEROUS OIL SHALE HAVING A HIGH CONTENT OF CALCIUM CARBONATE COMPRISING THE STEPS OF: (A) RETORTING SAID SHALE AT A TEMPERATURE BETWEEN ABOUT 100*C. AND POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE POLYMERS AND VINYLIDENE CHLORIDE POLYMERS; (B) EVAPORATING THE SOLVENT AT A TEMPERATURE BELOW 80* C. TO THEREBY FORM A MEMBRANE; ABOUT 500*C. TO VOLATILIZE THE OIL SUBSTANTIALLY COMPLETELY THEREFROM AND TO FORM SPENT SHALE HAVING A RESIDUAL ORGANIC SOLVENT AND CONTAINING SAID CALCIUM CARBONATE AND VANADIUM VALUES, (B) ROASTING THE SPENT SHALE AT A TEMPERATURE BETWEEN ABOUT 500*C. AND ABOUT 800*C. TO COMBUST THE RESIDUAL ORGANIC CONTENT AND TO FORM SHALE ASH CONTAINING SAID CALCIUM CARBONATE AND VANADIUM VALUES, (C) FORMING AN AQUEOUS SLURRY OF THE SHALE ASH, AND (D) LEACHING THE VANADIUM VALUES FROM THE SHALE ASH BY BEDUCING THE PH OF THE AQUEOUS SLURRY TO A FINAL VALUE BELOW 6; THE IMPROVEMENT WHICH COMPRISES SAID REDUCTION TO A FINAL PH VALUE BELOW 6 BEING EFFECTED BY INTRODUCING INTO THE AQUEOUS SLURRY AS AN ACID GAS SULFUR DIOXIDE AND CARBON DIOXIDE OR SULFUR DIOXIDE, CARBON DIOXIDE, NITROGEN AND OXYGEN, WHEREBY SAID VANADIUM VALUES ARE LEACHED FROM THE SHALE ASH WITHOUT DISSOLVING A SUBSTANTIAL AMOUNT OF THE CALCIUM CARBONATE.
Claim 2
Dependent Claim
214 words
IN A METHOD OF RECOVERING ACID LEACHABLE VANADIUM VALUES FROM VANADIFEROUS OIL SHALE HAVING A HIGH CONTENT OF CALCIUM CARBONATE COMPRISING THE STEPS OF: (A) RETORTING SAID SHALE AT A TEMPERATURE BETWEEN ABOUT 100*C. AND POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE POLYMERS AND VINYLIDENE CHLORIDE POLYMERS; (B) EVAPORATING THE SOLVENT AT A TEMPERATURE BELOW 80* C. TO THEREBY FORM A MEMBRANE; ABOUT 500*C. TO VOLATILIZE THE OIL SUBSTANTIALLY COMPLETELY THEREFROM AND TO FORM SPENT SHALE HAVING A RESIDUAL ORGANIC SOLVENT AND CONTAINING SAID CALCIUM CARBONATE AND VANADIUM VALUES, (B) ROASTING THE SPENT SHALE AT A TEMPERATURE BETWEEN ABOUT 500*C. AND ABOUT 800*C. TO COMBUST THE RESIDUAL ORGANIC CONTENT AND TO FORM SHALE ASH CONTAINING SAID CALCIUM CARBONATE AND VANADIUM VALUES, (C) FORMING AN AQUEOUS SLURRY OF THE SHALE ASH, AND (D) LEACHING THE VANADIUM VALUES FROM THE SHALE ASH BY BEDUCING THE PH OF THE AQUEOUS SLURRY TO A FINAL VALUE BELOW 6; THE IMPROVEMENT WHICH COMPRISES SAID REDUCTION TO A FINAL PH VALUE BELOW 6 BEING EFFECTED BY INTRODUCING INTO THE AQUEOUS SLURRY AS AN ACID GAS SULFUR DIOXIDE AND CARBON DIOXIDE OR SULFUR DIOXIDE, CARBON DIOXIDE, NITROGEN AND OXYGEN, WHEREBY SAID VANADIUM VALUES ARE LEACHED FROM THE SHALE ASH WITHOUT DISSOLVING A SUBSTANTIAL AMOUNT OF THE CALCIUM CARBONATE.