| 摘要 |
1. A method of producing a metal or a metal compound from an ingredient-regulated raw material obtained by mixing an ore or a concentrate containing a radioactive substance, which method involves a fluoridation process and collection and refinement of the metallic component from the extract, the fluoridation process including treating the ingredient-regulated raw material with hydrofluoric acid or a mixed acid containing, as an essential component, hydrofluoric acid, and separating the resultant mixture into an extract into which a metallic component is eluted and an extraction residue, wherein the employed ingredient-regulating raw material comprises the ore or the concentrate containing a radioactive substance and, as an additive, a substance insoluble to hydrofluoric acid or to a mixed acid containing, as an essential component, hydrofluoric acid, to thereby control to an arbitrary value of 1.0 wt.% or less the ratio of the amount of the radioactive substance remaining in the extraction residue generated through the fluoridation process to the weight of the extraction residue. 2. A method of producing tantalum, niobium, or a similar substance from an ingredient-regulated raw material obtained by mixing an ore or a concentrate containing at least one of tantalum and niobium and a radioactive substance, which method involves a fluoridation process and collection and refinement of tantalum, niobium, or a similar substance from the extract, the fluoridation process including treating the ingredient-regulated raw material with hydrofluoric acid or a mixed acid containing, as an essential component, hydrofluoric acid, and separating the resultant mixture into an extract into which a metallic component is eluted and an extraction residue, wherein the employed ingredient-regulating raw material comprises the ore or the concentrate containing a radioactive substance and, as an additive, a substance insoluble to hydrofluoric acid or to a mixed acid containing, as an essential component, hydrofluoric acid, to thereby control to an arbitrary value of 1.0 wt.% or less the ratio of the total amount of the radioactive substances, U3O8 and ThO2, remaining in the extraction residue generated through the fluoridation process to the weight of the extraction residue. 3. A method of producing a metal or a metal compound from an ore or a concentrate containing a radioactive substance, which method involves a fluoridation process and collection and refinement of the metallic component from the extract, the fluoridation process including treating said ingredient-regulated raw material with hydrofluoric acid or a mixed acid containing hydrofluoric acid as an essential component, and separating the resultant mixture into an extract into which a metallic component is eluted and an extraction residue, wherein the ore or the concentrate containing a radioactive substance is employed as a raw material, and a substance insoluble to hydrofluoric acid or to a mixed acid containing hydrofluoric acid as an essential component employed in a fluoridation process is added during said fluoridation process, to thereby control to an arbitrary value of 1.0 wt.% or less the ratio of the amount of the radioactive substance remaining in the extraction residue generated through the fluoridation process to the weight of the extraction residue. 4. A method of producing tantalum, niobium, or a similar substance from an ore or a concentrate containing at least one of tantalum and niobium and a radioactive substance, which method involves a fluoridation process and collection and refinement of the metallic component from the extract, the fluoridation process including treating said ingredient-regulated raw material with hydrofluoric acid or a mixed acid containing hydrofluoric acid as an essential component, and separating the resultant mixture into an extract into which a metallic component is eluted and an extraction residue, wherein the ore or the concentrate containing at least one of tantalum and niobium and a radioactive substance is employed as a raw material, and a substance insoluble to hydrofluoric acid or to a mixed acid containing hydrofluoric acid as an essential component employed in a fluoridation process is added during said fluoridation process, to thereby control to an arbitrary value of 1.0 wt.% or less the ratio of the amount of the radioactive substances, U3O8 and ThO2, remaining in the extraction residue generated through the fluoridation process to the weight of the extraction residue. 5. An ingredient-regulated raw material to be employed in a method of producing a metal or a metal compound as recited in claim 1, said ingredient-regulated raw material being a mixture comprising an ore or a concentrate containing a radioactive substance and a target metal or a similar substance at a grade of 50 wt.% or more based on the weight of the ore or the concentrate and at least, as an additive, a substance insoluble to hydrofluoric acid in an amount corresponding to the amount of the raw material removed through dissolution-extraction by use of hydrofluoric acid or insoluble to a mixed acid containing hydrofluoric acid as an essential component employed in the fluoridation process. 6. An ingredient-regulated raw material to be employed in a method of producing tantalum, niobium, or a compound thereof as recited in claim 2, said ingredient-regulated raw material being a mixture comprising an ore or a concentrate containing Ta2O3 and Nb2O5 in a total amount of 50 wt.% or more based on the weight of the ore or the concentrate and at least, as an additive, a substance insoluble to hydrofluoric acid in an amount corresponding to the amount of the raw material removed through dissolution-extraction by use of hydrofluoric acid or insoluble to a mixed acid containing hydrofluoric acid as an essential component employed in the fluoridation process. 7. An ingredient-regulated raw material as recited in claim 5 or 6, wherein the substance insoluble to hydrofluoric acid or a mixed acid containing hydrofluoric acid as an essential component serving as an additive for the raw material is added such that the amount of the substance reaches 5-50 wt.% of the ingredient-regulated raw material. 8. An ingredient-regulated raw material as recited in claim 5, wherein the substance insoluble to hydrofluoric acid or a mixed acid containing hydrofluoric acid as an essential component serving as an additive is at least one component included in an extraction residue of an ore or a concentrate generated through a fluoridation process involved in a method of producing a metal or a metal compound. 9. An ingredient-regulated raw material as recited in claim 6, wherein the substance insoluble to hydrofluoric acid or to a mixed acid containing hydrofluoric acid as an essential component serving as an additive, comprises at least one species selected from among barium oxide, barium sulfate, aluminum oxide, calcium salts, and lanthanide compounds serving as components of an extraction residue generated by subjecting an ore or a concentrate for collecting tantalum, niobium, or a similar substance to a fluoridation process involved in a method of producing tantalum, niobium, or a similar substance. 10. An ingredient-regulated raw material as described in any one of claims 5 to 9, the substance insoluble to hydrofluoric acid or a mixed acid containing hydrofluoric acid as an essential component serving as an additive is a powder having an average particle size of 0.5 mu m to 100 mu m. |
