A preparation method of ultra-high-purity tantalum oxide and the ultra-high-purity tantalum oxide prepared therefrom
An ultra-high-purity, tantalum oxide technology, applied in chemical instruments and methods, inorganic chemistry, tantalum compounds, etc., can solve problems that cannot fully meet the needs of the market, and achieve good separation effect of tantalum and niobium, easy operation, and stable process technology Effect
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Embodiment 1
[0066] Example 1 Preparation of ultra-high-purity tantalum oxide
[0067] The preparation of described ultra-high purity tantalum oxide, concrete steps are:
[0068] 1. Acidity adjustment:
[0069] (1) Fluorotantalic acid solution 800L, after determination, the total oxide concentration is (Ta+Nb) 2 o 5 Calculated as 125g / L, the molar concentration of hydrofluoric acid is 1.3moL / L, put it into the acid adjustment tank;
[0070] (2) Through calculation, 17.43L of chemically pure concentrated hydrofluoric acid and 74.32L of chemically pure concentrated sulfuric acid need to be added;
[0071] (3) Put the volume of concentrated hydrofluoric acid and concentrated sulfuric acid into the acid adjustment tank respectively, start stirring for 30 minutes, the total volume of the prepared fluorotantalic acid solution is 891.66L, and the total oxide concentration is (Ta+Nb) 2 o 5 Calculated as 112.15g / L, the molar concentration of hydrofluoric acid is 2.0moL / L, and the molar concent...
Embodiment 2
[0103] Example 2 Preparation of ultra-high-purity tantalum oxide
[0104] The preparation of described ultra-high purity tantalum oxide, concrete steps are:
[0105] 1. Acidity adjustment:
[0106] (1) Fluorotantalic acid solution 930L, measured as (Ta+Nb) 2 o 5 Calculated, the total oxide concentration is 118g / L, and the molar concentration of hydrofluoric acid is 0.9moL / L, which is put into the acid adjustment tank;
[0107] (2) Through calculation, 24.11L of chemically pure concentrated hydrofluoric acid and 82.83L of chemically pure concentrated sulfuric acid need to be added;
[0108] (3) Add the above-mentioned volumes of concentrated hydrofluoric acid and concentrated sulfuric acid into the acid adjustment tank, and start stirring for 60 minutes. The total volume of the prepared fluorotantalic acid solution is 1036.94L. 2 o 5 Calculated, the total oxide concentration is 105.83g / L, the molar concentration of hydrofluoric acid is 2.0moL / L, and the molar concentration...
Embodiment 3
[0137] Example 3 Preparation of ultra-high-purity tantalum oxide
[0138] The fluorotantalic acid solution used as a raw material in this embodiment, and the specific operations of each step are the same as in Example 1, except that:
[0139] In the extraction and separation step, the aqueous phase obtained after washing with the anti-niobium agent is not extracted with secondary octanol B, and the organic phase II is directly extracted with the anti-tantalum agent; 2 o 5 Calculation, the total amount of oxides = 98.2g / L;
[0140] After neutralization and precipitation, the obtained ultra-high-purity tantalum hydroxide slurry is represented by Ta 2 o 5 In total, the total amount of oxides = 95.45kg;
[0141] After adjusting and washing to remove fluorine, the obtained ultra-high-purity tantalum hydroxide filter cake is represented by Ta 2 o 5 In total, the total amount of oxides = 95.25kg;
[0142] After drying, the obtained ultra-high-purity tantalum hydroxide powder, ...
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