Method for extracting and separating zirconium and hafnium in nitric acid medium
a zirconium and hafnium technology, applied in the field of purification, can solve the problems of not being desired for industrial application, difficult to separate zirconium and hafnium from each other, and the mibk method has the following defects, and achieves the effects of less mass transfer, large extraction capacity, and convenient operation
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example 1
[0051]A method for separating zirconium and hafnium, comprising the following steps:
[0052](1) Preparing acidic raw liquid: the aqueous phase contains zirconium and hafnium ions at an initial total concentration of 1.5 mol / L; the hafnium ions are present at a concentration of 0.018 mol / L; the aqueous phase has an acidity of 2.87 mol / L; (NH4)2SO4 is present at a concentration of 0.8 mol / L.
[0053](2) The mixed organic phase consisting of 90% (v / v) of DIBK and 10% (v / v) of Cyanex923 is used as the extraction agent. First, pre-extraction is performed to the extraction agent and 5.5 mol / L nitric acid with equal volume. Then the extraction agent after pre-extraction is used as the organic phase, and the acidic raw liquid is used as the aqueous phase. The phase ratio (organic phase / aqueous phase) is kept at 2:1. Single-stage extraction is performed to the raw liquid at room temperature, with mixing time of the two phases being 10 min. Zirconium is left in the aqueous phase, and zirconium sol...
example 2
[0068]The organic phase consisted of 90% (v / v) of DIBK, 2% (v / v) of Cyanex921 and 8% (v / v) of isooctane (as diluent) and is subjected to pre-extraction in the presence of 6.0 mol / L nitric acid at a volume equal to the organic phase in advance for one time. The aqueous phase contained zirconium and hafnium ions at an initial total concentration of 1.5 mol / L. The concentration of hafnium ions was 0.018 mol / L. The acidity of the aqueous phase was 3.0 mol / L. (NH4)2SO4 was added in an amount of 1.0 mol / L. The phase ratio was kept at 2:1. Single-stage extraction was done at room temperature, with mixing time of the two phases being 5 min. Raffinate and hafnium-containing loaded organic phase were obtained after phase separation. Ammonia liquor was added to the raffinate for precipitation to give zirconium hydroxide precipitate. The loaded organic phase was stripped with 1.0 mol / L potassium carbonate, wherein the phase ratios for both washing and stripping were 1:2 and the mixing time of t...
example 3
[0070]The organic phase consisted of 90% (v / v) of DIBK, 8% (v / v) of Cyanex923 and 2% (v / v) of sulfonated kerosene (as diluent) and is subjected to pre-extraction in the presence of 6.0 mol / L nitric acid at a volume equal to the organic phase in advance for one time. The aqueous phase contained zirconium and hafnium ions at an initial total concentration of 1.5 mol / L. The concentration of hafnium ions was 0.018 mol / L. The acidity of the aqueous phase was 3.0 mol / L. (NH4)2SO4 was added in an amount of 0.8 mol / L. The phase ratio was kept at 2:1. Single-stage extraction was done at room temperature, with mixing time of the two phases being 5 min. Raffinate and hafnium-containing loaded organic phase were obtained after phase separation. Ammonia liquor was added to the raffinate for precipitation to give zirconium hydroxide precipitate containing little hafnium. The loaded organic phase was stripped with 1.0 mol / L sodium carbonate, wherein the phase ratios for both washing and stripping ...
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