Automatic method for producing fluorine-containing crystalline product from hydrofluoric acid solution

An automatic method for producing a fluorine-containing crystalline product from a hydrofluoric acid solution, the method comprising:

• providing the hydrofluoric acid solution and a reaction solution with a predetermined concentration, wherein the reaction solution is an aluminate solution or a silicate solution;
• sensing a fluoride ion concentration of the hydrofluoric acid solution and presetting a feeding flow rate of the hydrofluoric acid solution;
• outputting a predetermined flow rate of the reaction solution by an automatic control module based on the fluoride ion concentration and the feeding flow rate of the hydrofluoric acid solution and the predetermined concentration of the reaction solution;
• feeding the reaction solution into a reaction area at the predetermined flow rate, and feeding the hydrofluoric acid solution into the reaction area at the feeding flow rate, so as to perform a crystallization reaction and form a mixed solution in the reaction area;
• sensing a fluoride ion concentration of the mixed solution in the reaction area in real time while feeding the reaction solution and the hydrofluoric acid solution, receiving an in-situ parameter of the fluoride ion concentration of the mixed solution in the reaction area by the automatic control module, and controlling a feeding flow rate of the reaction solution in real time by the automatic control module under conditions that:
• when the in-situ parameter of the fluoride ion concentration received by the automatic control module falls within a range of a targeted crystal nucleation concentration ±5%, the feeding flow rate of the reaction solution is controlled to be equal to the predetermined flow rate of the reaction solution;
• when the in-situ parameter of the fluoride ion concentration is higher than 5% above the targeted crystal nucleation concentration, the feeding flow rate of the reaction solution is controlled to be greater than the predetermined flow rate of the reaction solution;
• and
• when the in-situ parameter of the fluoride ion concentration is lower than 5% below the targeted crystal nucleation concentration, the feeding flow rate of the reaction solution is controlled to be less than the predetermined flow rate of the reaction solution;
• sensing multiple fluorine-containing crystals produced by the crystallization reaction and precipitated to a crystal collection area in real time, and controlling whether to discharge a solution comprising the fluorine-containing crystals by the automatic control module based on whether the fluorine-containing crystals reach a predetermined height;
• and
• collecting a fluorine-containing crystalline product from a solution comprising the fluorine-containing crystals.