Recycling method of samarium cobalt magnetic waste material
A waste, samarium cobalt technology, applied in chemical instruments and methods, process efficiency improvement, cobalt oxide/cobalt hydroxide and other directions, can solve the problems of low purity of oxide products, low sulfuric acid leaching rate, etc., to achieve low production cost, The effect of high extraction and simple process
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Embodiment 1
[0022] Take 20g of samarium-cobalt waste and dissolve it with 200ml of 2.5M dilute hydrochloric acid. After the reaction is complete at 80°C, filter out the acid-insoluble matter. After adjusting the pH of the leaching solution to 2, slowly add a saturated solution made of 11g oxalic acid, and after the reaction is complete at 60°C, filter to obtain a rare earth oxalic acid precipitate.
[0023] After adjusting the pH of the filtrate, add 9.4ml of hydrogen peroxide to keep the pH = 4 so that the iron element in the solution will form a precipitate before the cobalt element, and the iron content in the solution will be reduced to below 0.10g / l, and the iron hydroxide precipitate will be removed by filtration. The cobalt filtrate after iron removal was adjusted to pH=4, and 18.8g of solid oxalic acid was added to react at 60°C to form a cobalt oxalate precipitate.
[0024] Precipitated rare earth oxalate and cobalt oxalate were dried and burned at 850°C for 2 hours to obtain rar...
Embodiment 2
[0026] Take 10g of samarium cobalt waste material and dissolve it with 100ml of 3.0M dilute hydrochloric acid at 80°C. After filtering the leaching solution, adjust the pH to 2, slowly add 5.5g of solid oxalic acid, and after the reaction is complete at 60°C, filter to obtain a rare earth oxalic acid precipitate.
[0027] After adjusting the pH of the filtrate, add 4.7ml of hydrogen peroxide to keep the pH = 4 so that the iron element in the solution will form a precipitate, which will be removed by filtration. The cobalt filtrate after iron removal was adjusted to pH=4, and 9.4g of solid oxalic acid was added to react at 60°C to form a cobalt oxalate precipitate.
[0028] Precipitated rare earth oxalate and cobalt oxalate were dried and burned at 800°C for 2 hours to obtain rare earth oxide (samarium oxide) and cobalt oxide.
Embodiment 3
[0030] Take 37g of samarium-cobalt waste material and dissolve it with 370ml of 2.5M dilute hydrochloric acid at 80°C. After filtering the leachate, adjust the pH to 2, slowly add a saturated solution made of 22g oxalic acid, and filter after the reaction is complete at 60°C to obtain a rare earth oxalic acid precipitate.
[0031] After adjusting the pH of the filtrate, add excess hydrogen peroxide to keep the pH = 4 so that the iron element in the solution will form a precipitate, which will be removed by filtration. Adjust the pH of the cobalt filtrate after iron removal to 4, add 23g of solid oxalic acid, and react at 60°C to form a cobalt oxalate precipitate.
[0032] Precipitated rare earth oxalate and cobalt oxalate were dried and burned at 850°C for 2 hours to obtain rare earth oxide (samarium oxide) and cobalt oxide.
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