Preparation method of anhydrous lithium iodide
A technology of lithium iodide and lithium hydroxide, applied in lithium halide and other directions, can solve the problems of shortened reaction time, easy deliquescence of lithium iodide, difficult packaging, etc., and achieves the effects of high product purity, short time consumption, and long time-consuming solution.
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[0026] Example 1
[0027] A method for preparing anhydrous lithium iodide, the steps are as follows:
[0028] (1) Put 8L of pure water into the reactor, then add 7.0Kg of iodine, stir for 15 minutes to dissolve completely, then add 2.25Kg of recrystallized lithium hydroxide, stir for 5 minutes, slowly add 80wt% hydrazine hydrate to the reactor , Until the solution just turns white (80wt% hydrazine hydrate dosage is about 0.8Kg), stabilize for 10 minutes, then add a small amount of iodine, until the solution just turns red, then add a small amount of 8wt% hydrazine hydrate to just turn the color of the solution back to white , Then use recrystallized lithium hydroxide solid to adjust the pH value to stabilize to 7.5, heat and evaporate and concentrate to 124°C, and the volume is concentrated to 1 / 2 of the original volume, then cool to room temperature through cold water, and filter to obtain the filtrate.
[0029] (2) Put the obtained filtrate into the reaction kettle, under stirring...
Example Embodiment
[0032] Example 2
[0033] A method for preparing anhydrous lithium iodide, the steps are as follows:
[0034] (1) Add 9L of pure water into the reactor, then add 7.8Kg of iodine, stir for 10 minutes to dissolve completely, then add 2.5Kg of recrystallized lithium hydroxide, stir for 5 minutes, slowly add 80wt% hydrazine hydrate to the reactor When the solution just turns white (80wt% hydrazine hydrate is about 0.89Kg), stabilize for 10 minutes, then add a small amount of iodine until the solution just turns red, and then add a small amount of 5wt% hydrazine hydrate to make the color of the solution just back to white. Then use the recrystallized lithium hydroxide solid to adjust the pH value to stabilize to 8.0, heat and evaporate and concentrate to 125°C, and concentrate the volume to 1 / 2 of the original volume, then pass cold water to cool to room temperature and filter to obtain the filtrate.
[0035] (2) Put the obtained filtrate into the reaction kettle, under stirring, evapora...
Example Embodiment
[0038] Example 3
[0039] A method for preparing anhydrous lithium iodide, the steps are as follows:
[0040] (1) Add 12L of pure water into the reactor, then add 8.75Kg of iodine, stir for 15 minutes to dissolve completely, then add 2.8Kg of recrystallized lithium hydroxide, stir for 5 minutes, slowly add 80wt% hydrazine hydrate to the reactor Until the solution just turned white (80wt% hydrazine hydrate dosage is about 0.10Kg), stabilize for 10 minutes, then add a small amount of iodine, until the solution just turns red, then add a small amount of 10wt% hydrazine hydrate to just turn the color of the solution back to white. Then use recrystallized lithium hydroxide solid to adjust the pH value to stabilize to 8.0, heat and evaporate to concentrate to 127°C, and concentrate the volume to 3 / 5 of the original volume, then pass cold water to cool to room temperature and filter to obtain the filtrate.
[0041] (2) Put the obtained filtrate into a reaction kettle, and under stirring, e...
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