Method for producing aluminum fluoride by using fluosilicic acid

The invention provides a method for producing aluminum fluoride by using fluosilicic acid. The method comprises the following steps: preheating a fluosilicic acid solution to 75-80 DEG C; adding aluminum hydroxide particles into the heated fluosilicic acid solution for heating reaction, controlling the reaction temperature to be 95-105 DEG C in the heating reaction process, thus preparing mixed slurry after the reaction is finished; filtering and washing the obtained mixed slurry to obtain filtrate, and crystallizing the filtrate to obtain aluminum fluoride slurry; centrifuging the aluminum fluoride slurry to obtain aluminum fluoride trihydrate crystals; and drying, calcining and cooling the obtained aluminum fluoride trihydrate crystal to obtain an anhydrous aluminum fluoride finished product. The production process is simple in process, the temperature and time of each step are strictly controlled, so that the raw materials are fully utilized, and thereby, the reaction rate is improved to the maximum extent