Method for separating tantalum and niobium from potassium metatantalate and potassium metaniobate mixture
A technology for potassium metaniobate and potassium metatantalate, which is applied in the field of separating tantalum and niobium, can solve problems such as ineffective utilization, and achieve the effects of easy operation, high separation efficiency and perfect process flow
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Embodiment 1
[0020] KTaO 3 , KNbO 3 The mixture is added with HF and H 2 SiF 6 In the mixed acid solution, the mixture of KTaO 3 and KNbO 3 The molar ratio is 1:1, the HF concentration in the mixed acid solution is 5mol / L, and the H 2 SiF 6 The amount used is 1.5 times of the theoretical amount, the liquid-solid ratio is 6.5:1, and it is stirred and decomposed at 80°C for 60 minutes. After the reaction is completed, the decomposed product is cooled to room temperature and filtered to obtain a clear liquid containing tantalum and niobium and an insoluble precipitate. The clear liquid containing tantalum and niobium can be directly sent to the current extraction and separation process of tantalum and niobium to complete the separation and purification of tantalum and niobium; the insoluble precipitate is washed with pure water, filtered, and dried at 30°C.
[0021] By ICP-AES analysis, KTaO 3 , KNbO 3 100% of the tantalum and niobium in the mixture enters into the tantalum-niobium-co...
Embodiment 2
[0023] KTaO 3 and KNbO 3 The mixture is added with HF and H 2 SiF 6 In the mixed acid solution, the mixture of KTaO 3 and KNbO 3 The molar ratio is 5:1, the HF concentration in the mixed acid solution is 8mol / L, and the H 2 SiF 6 The amount used is 1.2 times of the theoretical amount, the liquid-solid ratio is 4.0:1, stirred and decomposed at 60°C for 30 minutes, after the reaction is completed, the decomposed product is cooled to normal temperature, filtered, and the clear liquid and insoluble precipitate containing tantalum and niobium are obtained. The clear liquid containing tantalum and niobium can be directly sent to the current extraction and separation process of tantalum and niobium to complete the separation and purification of tantalum and niobium; the insoluble precipitate is washed with pure water, filtered, and dried at 50°C.
[0024] By ICP-AES analysis, KTaO 3 and KNbO 3 100% of the tantalum and niobium in the mixture enters into the tantalum-niobium-co...
Embodiment 3
[0026] KTaO 3 and KNbO 3 The mixture is added to the mixed acid solution of HF and H2SiF6, and the KTaO in the mixture 3 and KNbO 3 The molar ratio is 10:1, the HF concentration in the mixed acid solution is 12mol / L, and the H 2 SiF 6 The amount used is 1.0 times of the theoretical amount, the liquid-solid ratio is 3.0:1, stirred and decomposed at 30°C for 15 minutes, after the reaction is completed, the decomposed product is cooled to normal temperature, filtered, and the clear liquid and insoluble precipitate containing tantalum and niobium are obtained. The clear liquid containing tantalum and niobium can be directly sent to the current extraction and separation process of tantalum and niobium to complete the separation and purification of tantalum and niobium; the insoluble precipitate is washed with pure water, filtered, and dried at 40°C.
[0027] By ICP-AES analysis, KTaO 3 and KNbO 3 100% of the tantalum and niobium in the mixture enters into the tantalum-niobium...
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