A method for processing a heavy mineral concentrate obtained from froth treatment tailings to produce a zirconium concentrated product, including subjecting the heavy mineral concentrate to froth flotation, subjecting a flotation product to initial gravity separation, subjecting an initial gravity separation product to primary dry separation, subjecting a primary dry separation product to finishing gravity separation, and subjecting a finishing gravity separation product to finishing dry separation to produce a finishing dry separation product as the zirconium concentrated product.

The invention relates to a separation and recovery method for radioactive waste slag and specifically relates to a separation and recovery method for monazite slag. The separation and recovery method comprises the following steps: acid leaching, pressure filtration, water washing, extraction of valuable components and treatment of filtration slag. The separation and recovery method provided by the invention performs low-acid and low-temperature leaching on monazite slag, so that a liquid phase and a solid phase are easy to separate; after an ore dressing process is adopted for performing ore dressing and alkali decomposition on secondary slag, closed-loop circulation and recovery of uranium, thorium and rare earth is realized; and simultaneously, extraction raffinate waste acid is recycled, so that the emission of waste water is reduced, the consumption of sulfuric acid and fresh water and the treatment cost of the waste water are reduced, the production cost is reduced, the recovery rate of the valuable elements, namely the uranium, the thorium and the rare earth is more than 97%, and the whole process has no emission of the radioactive waste water and waste slag.

The invention relates to a separation and recovery method for radioactive waste slag and specifically relates to a separation and recovery method for monazite slag. The separation and recovery method comprises the following steps: acid leaching, pressure filtration, water washing, extraction of valuable components and treatment of filtration slag. The separation and recovery method provided by the invention performs low-acid and low-temperature leaching on monazite slag, so that a liquid phase and a solid phase are easy to separate; after an ore dressing process is adopted for performing ore dressing and alkali decomposition on secondary slag, closed-loop circulation and recovery of uranium, thorium and rare earth is realized; and simultaneously, extraction raffinate waste acid is recycled, so that the emission of waste water is reduced, the consumption of sulfuric acid and fresh water and the treatment cost of the waste water are reduced, the production cost is reduced, the recovery rate of the valuable elements, namely the uranium, the thorium and the rare earth is more than 97%, and the whole process has no emission of the radioactive waste water and waste slag.

A system for the recovery of titanium, titanium alloys, zirconium and zirconium alloys is disclosed. The system is fed with a mixture of chips including titanium chips, titanium alloy chips, zirconium chips and zirconium alloy chips, ferromagnetic chips and electrically conductive non-ferromagnetic chips. The system has at least one magnetic separator, a drying device and an Eddy current separator.

A method for recovering hafnium and impurity metals from a hafnium-containing waste residue, comprises dissolving the waste residue in sulfuric acid and ammonium sulfate to obtain an acidic solution, adjusting acidity of the acidic solution, and adding a complexing agent to obtain a material solution; conducting extraction to obtain a hafnium-loaded organic phase and an impurity metal ions-containing aqueous phase; subjecting the hafnium-loaded organic phase to purification, stripping, precipitation, and filtration, and washing and burning to obtain hafnium oxide; precipitating the impurity metal ions-containing aqueous phase, washing a resulting precipitate to remove the complexing agent; dissolving a resulting precipitates of the impurity metal ions in sulfuric acid, and adjusting acidity of a resulting solution to obtain a solution of the impurity metal ions; extracting the solution of the impurity metal ions to obtain an impurity metal ions-loaded organic phase, purifying and stripping to obtain oxides of the impurity metals.

A method for recovering hafnium and impurity metals from a hafnium-containing waste residue, comprises dissolving the waste residue in sulfuric acid and ammonium sulfate to obtain an acidic solution, adjusting acidity of the acidic solution, and adding a complexing agent to obtain a material solution; conducting extraction to obtain a hafnium-loaded organic phase and an impurity metal ions-containing aqueous phase; subjecting the hafnium-loaded organic phase to purification, stripping, precipitation, and filtration, and washing and burning to obtain hafnium oxide; precipitating the impurity metal ions-containing aqueous phase, washing a resulting precipitate to remove the complexing agent; dissolving a resulting precipitates of the impurity metal ions in sulfuric acid, and adjusting acidity of a resulting solution to obtain a solution of the impurity metal ions; extracting the solution of the impurity metal ions to obtain an impurity metal ions-loaded organic phase, purifying and stripping to obtain oxides of the impurity metals.

Provided are a metal extractant for extracting metal ions present in a water phase to an oil phase, and a separation recovery method of metal ions. In the metal extractant, nitrogen atoms positioned at both terminals of a molecular chain forming the metal extractant do not form a carbamoyl bond and include an unsubstituted hydrocarbon group and a group including and any coordinating functional group in a group G1 of coordinating functional groups below as a coordinating functional group (a) for metal ions to be extracted, or include an unsubstituted hydrocarbon group. The separation recovery method includes mixing an oil phase including the metal extractant and a water phase including plural kinds of metal ions.

Provided are a metal extractant for extracting metal ions present in a water phase to an oil phase, and a separation recovery method of metal ions. In the metal extractant, nitrogen atoms positioned at both terminals of a molecular chain forming the metal extractant do not form a carbamoyl bond and include an unsubstituted hydrocarbon group and a group including and any coordinating functional group in a group G1 of coordinating functional groups below as a coordinating functional group (a) for metal ions to be extracted, or include an unsubstituted hydrocarbon group. The separation recovery method includes mixing an oil phase including the metal extractant and a water phase including plural kinds of metal ions.

A method for synthesizing a zirconium complex includes: mixing a solvent containing an organic substance having a dipole moment of 3.0 D or more, a chelating agent solution in which a chelating agent containing a structure represented by General Formula (1) or General Formula (2) is dissolved, and zirconium dissolved in an acidic solution, to obtain a mixed solution; and setting the mixed solution at a predetermined temperature or more to synthesize a zirconium complex. ##STR00001##

A method for synthesizing a zirconium complex includes: mixing a solvent containing an organic substance having a dipole moment of 3.0 D or more, a chelating agent solution in which a chelating agent containing a structure represented by General Formula (1) or General Formula (2) is dissolved, and zirconium dissolved in an acidic solution, to obtain a mixed solution; and setting the mixed solution at a predetermined temperature or more to synthesize a zirconium complex. ##STR00001##