A kind of combined leaching agent of scheelite and its processing method
A treatment method and combined leaching technology are applied in the improvement of process efficiency, calcium/strontium/barium sulfate and other directions, which can solve the problems of inability to effectively avoid co-extraction of impurities, poor selectivity of tungsten and impurities, and low precipitation rate of calcium salts. To achieve the effect of high-efficiency leaching, increasing added value, and reducing co-extraction of impurities
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Embodiment 1
[0043] Scheelite (including WO 3 67.5%, Fe 0.3%) 1kg is placed in formula 1 compound-phosphoric acid aqueous solution (5L, wherein, formula 1 compound concentration 3.0mol / L, phosphoric acid consumption is the molar ratio 1:12 of phosphorus and tungsten in scheelite), reaction The temperature is 90°C, the reaction time is 0.5h, the leaching rate of tungsten is 98.6%, and the leaching rate of iron is 50.2%. Filtrate adopts primary amine extractant N 1923 , the volume ratio of the organic phase is 10% N 1923 -20% 2-octanol-70% kerosene, the temperature is 40°C, the ratio is 1:0.5, after a mixing time of 5 minutes for extraction, the extraction rate of tungsten is 99.3%, and the extraction rate of iron is 0.02%. The loaded tungsten organic phase was back-extracted with 7mol / L ammonia water, the ratio was 1:1, the stripping temperature was 40°C, the stripping time was 20min, and the stripping rate of tungsten was 98.2%. Add sulfuric acid to the raffinate for decalcification, th...
Embodiment 2
[0045] Scheelite (including WO 3 67.5%, Fe 0.3%) 1kg is placed in formula 1 compound solution (15L, wherein, formula 1 compound concentration 0.5mol / L, apatite consumption is the molar ratio 1:2 in phosphorus and mineral tungsten), reaction temperature 40 °C, the reaction time is 4h, the leaching rate of tungsten is 99.3%, and the leaching rate of iron is 48.4%. The filtrate uses macroporous weakly basic anion exchange resin D301 to extract tungsten in the leachate, the volume ratio of resin to solution is 0.2:1, the temperature is 40°C, the stirring contact time is 2h, the adsorption rate of tungsten is 99.1%, and the adsorption rate of iron is 99.1%. 1.5% (mainly physical inclusions in the resin channels). The loaded tungsten ion exchange resin obtained by the ion exchange method is desorbed with 3mol / L ammonia water, the volume ratio of the resin to the solution is 1:1, the desorption temperature is 60°C, the desorption time is 0.5h, and the tungsten desorption rate is 98....
Embodiment 3
[0047] Scheelite (including WO 3 43.8%, Fe1.5%) 1kg is placed in formula 1 compound-phosphoric acid aqueous solution (8L, wherein, formula 1 compound concentration 2.0mol / L, phosphoric acid consumption is the molar ratio 1:10 of phosphorus and tungsten in mineral), reaction temperature 60℃, reaction time 1h, the leaching rate of tungsten is 98.9%, and the leaching rate of iron is 85.4%. Filtrate adopts primary amine extractant N 1923 , the volume ratio of the organic phase is 20% N 1923 -20% 2-octanol-60% kerosene, the temperature is 20°C, the ratio is 1:3, after 15 minutes of mixing time to extract, the extraction rate of tungsten is 99.1%, and the extraction rate of iron is 0.04%. The tungsten-loaded organic phase was back-extracted with 5mol / L ammonia water, the ratio was 1:1, the stripping temperature was 60°C, the stripping time was 20min, and the stripping rate of tungsten was 98.0%. Add sulfuric acid to the raffinate for decalcification, the molar ratio of the amount...
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