Separation method of lithium dihydrogen phosphate and preparation method thereof
A technology of lithium dihydrogen phosphate and separation method, which is applied in the field of preparation of lithium dihydrogen phosphate, can solve problems such as unevenness and large diameter of lithium dihydrogen phosphate particles, and achieve the effect of uniform particle diameter
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[0029] The preparation method of lithium dihydrogen phosphate provided by the present invention comprises contacting and reacting lithium hydroxide and / or lithium carbonate with phosphoric acid in the presence of water to prepare an aqueous solution containing lithium dihydrogen phosphate, and then cooling and crystallizing to separate dihydrogen phosphate Lithium, wherein, the method for separating lithium dihydrogen phosphate is the method provided by the present invention.
[0030] According to the preparation method provided by the present invention, there is no special restriction on the order of adding lithium hydroxide and / or lithium carbonate, phosphoric acid and water. In order to mix well and uniformly, in preferred cases, add water first, and then add lithium hydroxide And / or lithium carbonate, finally add phosphoric acid to carry out contact reaction in order.
[0031] According to the preparation method provided by the present invention, the dosages of the lithium...
Embodiment 1
[0035] In a reactor equipped with a stirrer and 90°C circulating water in the jacket, 3 liters of water and 2239.1 grams of Li with a purity of 99% were successively added. 2 CO 3 powder and 8093.6 grams of 85% H 3 PO 4 The solution was reacted for 1 hour under stirring at a rotating speed of 800 r / min.
[0036] The reaction produces LiH 2 PO 4Continue heating to evaporate the water until the concentration of the aqueous solution is 80%, move the solution to another reactor equipped with a stirrer, and add 500 grams of liquid nitrogen rapidly under the high-speed stirring condition of 1200r / min , the reaction solution was rapidly cooled to 0°C, and LiH 2 PO 4 crystal particles. The mixed solution containing the crystal is centrifuged, and the separated solid product is poured into 7483 grams of ethanol solution stirred at a speed of 1200r / min for washing, then filtered, and finally dried at 60°C for 5 hours, and the separated liquid The product is subjected to the same...
Embodiment 2
[0040] In a reactor equipped with a stirrer and 98°C circulating water in the jacket, 5 liters of water and 2543.4 grams of LiOH·H with a purity of 99% were successively added. 2 O powder and 7609.1 g of 85% pure H 3 PO 4 solution, and reacted for 2 hours under stirring at a rotating speed of 800r / min.
[0041] The reaction produces LiH 2 PO 4 Continue heating to evaporate the water until the concentration of the aqueous solution is 70%, move the solution to another reactor equipped with a stirrer, and add 500 grams of liquid nitrogen rapidly under the high-speed stirring condition of 1200r / min , the reaction solution was rapidly cooled to 8°C, and LiH 2 PO 4 crystal particles. The mixed solution containing the crystal is centrifuged, and the separated solid product is poured into 9354 grams of ethanol solution stirred at a speed of 1200r / min for washing, then filtered, and finally dried at 90°C for 3 hours, and the separated liquid The product was subjected to the same...
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