Method for extracting and separating zirconium and hafnium in nitric acid medium
An extraction and nitric acid technology, applied in the field of purification, can solve the problems of polluted environment, large solvent loss, poor operating workshop environment, etc., and achieve the effects of simple process flow, clean separation process and large extraction capacity
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Embodiment 1
[0053] A method for separating zirconium and hafnium, the specific steps are as follows:
[0054] (1) Preparation of acidic feed liquid: the water phase is composed of an initial total concentration of zirconium and hafnium ions of 1.5mol / L, wherein the concentration of hafnium ions is about 0.018mol / L, and the acidity of the water phase is 2.87mol / L, (NH 4 ) 2 SO 4 The concentration is 0.8mol / L.
[0055] (2) extractant adopts the mixed organic phase that the DIBK of 90% (v / v) and the Cyanex923 of 10% (v / v) form, first the nitric acid of extractant and equal volume 5.5mol / L is carried out pre-extraction once, then The extraction agent after the pre-extraction is used as the organic phase, the acid feed liquid is used as the water phase, and the control ratio (organic phase: water phase) is 2: 1, and the feed liquid is carried out to single-stage extraction at room temperature, and the mixing time of the two phases is 10 Minutes, the zirconium stays in the water phase to obt...
Embodiment 2
[0078] The organic phase is composed of 90% (v / v) of DIBK, 2% (v / v) of Cyanex921 and 8% (v / v) of isooctane (as a diluent), and pre-mixed with an equal volume of 6.0mol / L Nitric acid pre-extracted once, the water phase composition is the initial total concentration of zirconium and hafnium ions 1.5mol / L, wherein the concentration of hafnium ions is 0.018mol / L, and the acidity of the water phase is 3.0mol / L, (NH 4 ) 2 SO 4 The addition amount is 1.0mol / L, the control ratio is 2:1, single-stage extraction is carried out at room temperature, the two-phase mixing time is 5 minutes, and the raffinate and the loaded organic phase containing hafnium are obtained after phase separation. Re-precipitate with ammonia water to obtain zirconium hydroxide precipitate; carry out back-extraction with 1.0mol / L potassium carbonate on the loaded organic phase, the ratio of washing and back-extraction is 1:2, and the mixing time of the two phases is 5 minutes to obtain zirconium-containing The h...
Embodiment 3
[0081] The organic phase is composed of 90% (v / v) of DIBK, 8% (v / v) of Cyanex923 and 2% (v / v) of sulfonated kerosene (as a diluent), and pre-mixed with an equal volume of 6.0mol / L Nitric acid pre-extracted once, the water phase composition is the initial total concentration of zirconium and hafnium ions 1.5mol / L, wherein the concentration of hafnium ions is 0.018mol / L, and the acidity of the water phase is 3.0mol / L, (NH 4 ) 2 SO 4 The addition amount is 0.8mol / L, the control ratio is 2:1, single-stage extraction is carried out at room temperature, the two-phase mixing time is 5 minutes, and the raffinate and the loaded organic phase containing hafnium are obtained after phase separation. Re-precipitation with ammonia water to obtain precipitation of zirconium hydroxide with less hafnium; back-extract the loaded organic phase with 1.0mol / L sodium carbonate, the ratio of washing and back-extraction is 1:2, and the mixing time of the two phases is 5 minutes. A zirconium-contain...
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