Production of lithium fluoride
A lithium fluoride and ammonium fluoride technology, which is applied in the direction of alkali metal fluoride, can solve the problems of low yield of high-purity products, low raw material purity requirements, high raw material purity requirements, etc., achieve high reaction conversion rate and improve resource utilization Efficiency and simple operation
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Embodiment 1
[0024] This example is used to illustrate the preparation method of lithium fluoride provided by the present invention.
[0025] 86 grams of 47% by weight of hydrofluoric acid and 174 grams of 25% by weight of ammonia were mixed in a reaction vessel containing a polytetrafluoroethylene liner at 5°C for 80 minutes to prepare an ammonium fluoride solution, and then the solution was transferred to into a 1000 ml round-bottomed three-neck flask, add 96 g of lithium chloride and 300 ml of water, stir and react at 45°C for 90 minutes, then filter the system, wash the resulting solid with deionized water until the pH of the washing solution is 7, and then Dry at 150° C. for 13 hours to obtain 48.8 g of dried lithium fluoride solid with a purity of 99.86%. In addition, the filtered mother liquor is heated and concentrated at 95°C in a device equipped with a tail gas conduit until no hydrogen fluoride gas escapes from the system, wherein the tail gas is absorbed by water, the mother li...
Embodiment 2
[0027]This example is used to illustrate the preparation method of lithium fluoride provided by the present invention.
[0028] 106 grams of 47% by weight of hydrofluoric acid and 174 grams of 25% by weight of ammonia were mixed in a reaction vessel containing a polytetrafluoroethylene liner at 30°C for 30 minutes to prepare an ammonium fluoride solution, and then the solution was transferred to into a 1000 ml round-bottomed three-neck flask, add 76 g of lithium chloride and 200 ml of water, stir and react at 35°C for 110 minutes, then filter the system, wash the resulting solid with deionized water until the pH of the washing solution is 7, and then Dry at 350°C for 6 hours to obtain 37.8 g of dry lithium fluoride solid with a purity of 99.9%. In addition, heat and concentrate the filtered mother liquor at 95°C in a device equipped with a tail gas conduit until no hydrogen fluoride gas escapes from the system, wherein the tail gas is absorbed by water, the mother liquor is sl...
Embodiment 3
[0030] This example is used to illustrate the preparation method of lithium fluoride provided by the present invention.
[0031] 66 grams of lithium chloride, 200 milliliters of water and 174 grams of ammonium fluoride solution with a concentration of 33% by weight were added together in a 1000 milliliter round-bottomed three-necked flask, stirred and reacted at 80° C. for 30 minutes, and then the system was filtered to obtain a solid Wash with deionized water until the pH of the washing solution is 7, and then dry at 250° C. for 9 hours to obtain 37.7 g of dry lithium fluoride solid with a purity of 99.9%. In addition, heat and concentrate the filtered mother liquor at 98°C in a device equipped with a tail gas conduit until no hydrogen fluoride gas escapes from the system, wherein the tail gas is absorbed by water, the mother liquor is slowly cooled to 8°C, and filtered to obtain 77.6 grams of ammonium chloride crystals, the mother liquor is collected for later use.
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Abstract
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