Synthetic method of Lead Fluoride PbF2
After 3 hours of heat preservation, the crystals were filtered out, washed with water until pH ≥ 5, filtered by suction and dried to obtain the finished product of Lead Fluoride PbF2.
1. Dissolve the reagent lead nitrate in water so that the relative density of the solution is 1.08 (40ºC). After filtering out the insoluble matter, pass through the ammonia gas to completely precipitate the lead hydroxide, and wash with water until the NO3- ion is qualified. Then add water and stir well until it becomes a paste, then slowly add hydrofluoric acid under constant stirring to complete the reaction. After 3 hours of heat preservation, the crystals were filtered out, washed with water until pH ≥ 5, filtered by suction and dried to obtain the finished product of Lead Fluoride PbF2.
2. Put 110g of 20% hydrofluoric acid into a polyethylene beaker, cool the outside of the beaker, add 130g of lead carbonate or basic lead carbonate prepared from lead acetate little by little under stirring, after adding, put the beaker Stir in warm water for one day to remove carbon dioxide. After standing overnight, pour off the supernatant liquid, add about 200mL of water, stir, filter, and collect the precipitate. After the precipitate was further washed with water, it was transferred to a platinum dish and dried at below 100°C. Then put the platinum dish into an electric furnace and heat it to 800-850°C to remove the attached hydrogen fluoride. After cooling, 100-110 g of colorless Lead Fluoride PbF2 powder can be obtained.
The stoichiometric lead nitrate and sodium fluoride were formulated into solutions and then mixed, and the Lead Fluoride PbF2 precipitate was also formed immediately. The precipitate was collected by filtration, washed with water and acetone successively. Then dry it in the air below 100°C, and then dry it under reduced pressure at room temperature to prepare completely anhydrous Lead Fluoride PbF2.