Method for precipitating cerium-containing rare-earth carbonate
A technology of rare earth carbonate and rare earth material liquid, applied in the direction of improving process efficiency, etc., can solve problems such as insufficient market competitiveness of products, poor acid solubility, application obstacles, etc., achieve improved acid solubility, increase acid solubility, and simple operation Effect
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[0022] Example 1
[0023] Take the cerium chloride feed liquid produced in the rare earth extraction workshop of Zibo Baotou Steel and Ganoderma lucidum, and precipitate according to the following steps:
[0024] (1) Add 1000 mL of cerium chloride feed solution with a concentration of 0.45 mol / L into a 5000-ml beaker, and add a sodium carbonate solution with a concentration of 13% in another beaker. Use the bubbling method to pour nitrogen into the cerium chloride feed solution and the sodium carbonate solution respectively for 5 minutes, discharge the air in the beaker, and discharge the dissolved oxygen in each solution. The concentration of dissolved oxygen in the cerium chloride feed solution is 0.32. mg / L; in sodium carbonate solution: 0.16mg / L.
[0025] (2) Under the condition of stirring at 23°C, slowly add the sodium carbonate solution to the cerium chloride feed solution until the pH of the supernatant is 7.
[0026] (3) Centrifuge the precipitate and rinse for 15 minutes to...
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[0028] Example 2
[0029] Take the cerium nitrate material liquid produced by Zibo Baotou Steel Ganoderma lucidum rare earth post-processing workshop, and precipitate it in sequence according to the following steps:
[0030] (1) Add 1000 mL of cerium nitrate feed solution with a concentration of 0.54 mol / L in a 5000-ml beaker, and add a 10% sodium bicarbonate solution in another beaker. The bubbling method was used to inject argon gas into the cerium nitrate feed solution and the sodium bicarbonate solution for 10 minutes respectively to exhaust the air in the beaker and exhaust the dissolved oxygen in each solution. The concentration of dissolved oxygen detected is 0.22 mg / L in the cerium nitrate feed solution; 0.26 mg / L in the sodium bicarbonate solution.
[0031] (2) Under the condition of stirring at 25°C, the co-current precipitation of sodium bicarbonate and cerium nitrate feed liquid was controlled, and the pH value after the reaction was 6.85.
[0032] (3) Centrifuge the prec...
Example Embodiment
[0034] Example 3
[0035] Take Zibo Baotou Steel's Ganoderma lucidum rare earth extraction workshop to produce lanthanum chloride and cerium chloride liquid, and then precipitate according to the following steps:
[0036] (1) Add 1000 mL of lanthanum cerium chloride feed solution with a concentration of 0.84 mol / L into a 5000-ml beaker, add 8% sodium carbonate solution in another beaker, and add 4000 mL of pure water into the third beaker. The bubbling method was used to inject carbon dioxide into the lanthanum and cerium chloride feed solution, the sodium carbonate solution and the pure water respectively for 20 minutes, and then exhaust the air in the beaker and exhaust the dissolved oxygen in each solution. The concentration of dissolved oxygen detected is 0.12mg / L in lanthanum and cerium chloride feed solution; in sodium carbonate solution: <0.1mg / L; pure water: <0.1mg / L.
[0037] (2) Under the condition of stirring at 5°C, slowly add the sodium carbonate solution to the lanthan...
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