Method for preparing industrial-grade lithium carbonate from lithium recycled from spodumene calcium-magnesium slag
A calcium-magnesium slag, spodumene technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of wasting lithium resources and low recovery rate, and achieve high lithium recovery rate, high economic value, The effect of high production safety
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Embodiment 1
[0055] A. Dissolution of lithium-containing calcium-magnesium slag: Under normal temperature conditions, take 1 kg of spodumene calcium-magnesium slag (0.6% lithium content on a wet basis) and put it into a reaction vessel, add 2L of pure water while stirring, and obtain after 0.5h Calcium magnesium slag solution.
[0056] B. Acid addition reaction: at room temperature, slowly add 160 g of concentrated sulfuric acid with a mass percentage concentration of 98% to the solution in step A while stirring, adjust the pH of the solution to 5, and then stir for 1 hour after obtaining an acidic solution.
[0057]C. Quicklime to remove magnesium: At normal temperature, add quicklime with a purity of 60% to the solution after the reaction in step B for 1 hour, adjust the pH to 10, stir and react for 0.5 hours, filter to obtain magnesium-containing lithium-containing solution and slag, and then remove the slag. Rinse with 2L of pure water (0.06% lithium content on a wet basis).
[0058] ...
Embodiment 2
[0063] A. Dissolution of lithium-containing calcium-magnesium slag: Under normal temperature conditions, take 1.5kg of spodumene calcium-magnesium slag (0.65% lithium content on a wet basis) and put it into a reaction vessel, add 3.5L pure water while stirring, and after 1h A calcium magnesium slag solution is obtained.
[0064] B. Acid addition reaction: at room temperature, slowly add 300 g of concentrated sulfuric acid with a mass percentage concentration of 98% to the solution in step A while stirring, and adjust the pH of the solution to 7. After obtaining a slightly acidic solution, stir for 2 hours.
[0065] C. Removal of magnesium with quicklime: At normal temperature, add quicklime with a mass fraction of 80% to the solution after the reaction in step B for 2 hours, adjust the pH to 11, stir and react for 1.5 hours, and filter to obtain magnesium-containing lithium-containing solution and slag, slag Rinse with 3L of pure water (0.05% lithium content on a wet basis). ...
Embodiment 3
[0071] A. Dissolution of lithium-containing calcium-magnesium slag: Under normal temperature conditions, take 2kg of spodumene calcium-magnesium slag (0.72% lithium content on a wet basis) and put it into a reaction vessel, add 6L of pure water while stirring, and obtain calcium after 1h Magnesium slag solution.
[0072] B. Acid addition reaction: at room temperature, slowly add 350 g of concentrated sulfuric acid with a mass percent concentration of 98% to the solution in step A while stirring, and adjust the pH of the solution to 6. After obtaining a slightly acidic solution, stir for 1.5 hours.
[0073] C. Quicklime to remove magnesium: At room temperature, add quicklime with a mass fraction of 68.5% to the solution after the reaction in step B for 1.5 hours, adjust the pH to 10.5, stir and react for 1 hour, and filter to obtain magnesium-containing lithium-containing solution and slag, slag Then rinse with 4L of pure water (lithium content on a wet basis: 0.057%).
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