The present invention is directed towards methods for isolating molybdenum compounds from a mixture of fission products. The mixture of fission products may be extracted from a molten salt reactor system. Utilizing a phase transfer agent, the molybdenum compounds may be extracted from an aqueous solution into an organic solution, thereby isolating the molybdenum compound from the mixture of fission products. Molybdate may then be isolated from the resulting organic solution and provided to a generator to facilitate transformation into technitum-99m.

The present invention is directed towards methods for isolating molybdenum compounds from a mixture of fission products. The mixture of fission products may be extracted from a molten salt reactor system. Utilizing a phase transfer agent, the molybdenum compounds may be extracted from an aqueous solution into an organic solution, thereby isolating the molybdenum compound from the mixture of fission products. Molybdate may then be isolated from the resulting organic solution and provided to a generator to facilitate transformation into technitum-99m.

A molybdenum trioxide powder contains an aggregate of primary particles having a crystal structure of molybdenum trioxide. The molybdenum trioxide powder has a MoO.sub.3 content ratio of 99.6% or more measured by X-ray fluorescence (XRF), and has an average particle diameter of the primary particles of 1 m or less. A method for producing the above molybdenum trioxide powder includes vaporizing a molybdenum oxide precursor compound to form molybdenum trioxide vapor, and cooling the molybdenum trioxide vapor.

A molybdenum trioxide powder contains an aggregate of primary particles having a crystal structure of molybdenum trioxide. The molybdenum trioxide powder has a MoO.sub.3 content ratio of 99.6% or more measured by X-ray fluorescence (XRF), and has an average particle diameter of the primary particles of 1 m or less. A method for producing the above molybdenum trioxide powder includes vaporizing a molybdenum oxide precursor compound to form molybdenum trioxide vapor, and cooling the molybdenum trioxide vapor.

An object is to provide an metal complex oxide having excellent thermal conductivity and dielectric properties, a resin composition containing the metal complex oxide and capable of expressing excellent thermal conductivity and dielectric properties, and a molded product thereof. Specifically, a gahnite particle that includes zinc atoms, aluminum atoms, and oxygen atoms, and molybdenum atoms and has a dielectric loss tangent of 1.010.sup.3 or less at 1 GHz is used.

An object is to provide an metal complex oxide having excellent thermal conductivity and dielectric properties, a resin composition containing the metal complex oxide and capable of expressing excellent thermal conductivity and dielectric properties, and a molded product thereof. Specifically, a gahnite particle that includes zinc atoms, aluminum atoms, and oxygen atoms, and molybdenum atoms and has a dielectric loss tangent of 1.010.sup.3 or less at 1 GHz is used.

A meta-stable ferroelectric structure including one of the following oxides: an isovalent combination of the formula M.sub.xM.sub.1-xO.sub.2-, wherein M, M={Zr, Hf, Pb, W, Mo, Nb, Te, Ti}, 0x1, 00.5 excluding {Hf.sub.xZr.sub.1-xO.sub.2 all x in Pca2.sub.1 phase}; an aliovalent combination of the formula MI.sub.xMII.sub.1-xO.sub.2-, wherein MI, MII={Bi, Y, Ta, In, Mo, Nb, Sc, Tl, Pd, Sb, W, Cr, Ge, Rh, Ti, Ag, Sn, Au, Ir, Pd, Ni, Ru, Hg}, 0x1, 00.5, excluding certain aliovalent combinations; or an isovalent-aliovalent combination of the formula M.sub.xMI.sub.yMII.sub.1-x-yO.sub.2-, wherein M, MI, and MII are as set forth above, 0x1, 0y1, 00.5; wherein the ferroelectric structure is in a Pca2.sub.1 or Pmn2.sub.1 space group or a subgroup thereof.

A meta-stable ferroelectric structure including one of the following oxides: an isovalent combination of the formula M.sub.xM.sub.1-xO.sub.2-, wherein M, M={Zr, Hf, Pb, W, Mo, Nb, Te, Ti}, 0x1, 00.5 excluding {Hf.sub.xZr.sub.1-xO.sub.2 all x in Pca2.sub.1 phase}; an aliovalent combination of the formula MI.sub.xMII.sub.1-xO.sub.2-, wherein MI, MII={Bi, Y, Ta, In, Mo, Nb, Sc, Tl, Pd, Sb, W, Cr, Ge, Rh, Ti, Ag, Sn, Au, Ir, Pd, Ni, Ru, Hg}, 0x1, 00.5, excluding certain aliovalent combinations; or an isovalent-aliovalent combination of the formula M.sub.xMI.sub.yMII.sub.1-x-yO.sub.2-, wherein M, MI, and MII are as set forth above, 0x1, 0y1, 00.5; wherein the ferroelectric structure is in a Pca2.sub.1 or Pmn2.sub.1 space group or a subgroup thereof.

For treating petrochemical catalysts for the selective extraction of molybdenum therefrom, a plant and a process are proposed for extracting the molybdenum by charging a batch of catalysts to a rotary kiln of which the refractory is heated or preheated to a high temperature, and setting the kiln in rotation so that the catalyst charge undergoes constant renewal of the surface in contact with the superheated refractory. The catalyst charge is brought to temperatures of the order of 1300 C. (1250 to 1350 C.), which allow around 95% of the molybdenum present to sublime.

For treating petrochemical catalysts for the selective extraction of molybdenum therefrom, a plant and a process are proposed for extracting the molybdenum by charging a batch of catalysts to a rotary kiln of which the refractory is heated or preheated to a high temperature, and setting the kiln in rotation so that the catalyst charge undergoes constant renewal of the surface in contact with the superheated refractory. The catalyst charge is brought to temperatures of the order of 1300 C. (1250 to 1350 C.), which allow around 95% of the molybdenum present to sublime.