Production process method of low-density aluminum fluoride

The invention relates to a production process method of low-density aluminum fluoride in the technical field of aluminum fluoride preparation. The preparation method comprises the following steps of:S1, adding a template agent into a reaction tank filled with fluosilicic acid, uniformly mixing, heating to 45-50 DEG C, adding sodium bicarbonate in batches, adding sulfuric acid when the addition amount of sodium bicarbonate is 1/3 of the total amount, heating to 80-90 DEG C, completing the adding of sodium bicarbonate, reacting for 1-1.5 hours, filtering, washing, and taking filtrate to obtaina reaction solution 1; S2, heating the reaction solution 1 to 60-65 DEG C, adding aluminum chloride hexahydrate under a stirring condition, reacting for 0.5-1h, adding a template agent, heating to 125-130 DEG C, adjusting the air pressure in a crystallization tank to 290-310kpa, and condensing to obtain crystals and a wet material; and S3, drying the wet material at 70-80 DEG C and then carrying out segmented temperature-c