Production method of anhydrous aluminum fluoride

The invention discloses a production method of anhydrous aluminum fluoride. The production method comprises the following steps: S1, preparing crude hydrogen fluoride gas from fluorite; S2, condensingthe crude hydrogen fluoride gas to obtain hydrogen fluoride liquid and waste gas; S3, transferring the hydrogen fluoride liquid into a storage tank, adding an oxidizing agent for complexing reaction,and then transferring into a rectifying tower for rectification; and S4, evaporating the rectified hydrogen fluoride into gas, and reacting the gas with aluminum hydroxide to obtain anhydrous aluminum fluoride. Before hydrogen fluoride and aluminum hydroxide react to produce aluminum fluoride, a purification process system is additionally arranged, the characteristic that hydrogen fluoride prepared from fluorite and impurities contained in the hydrogen fluoride have different boiling points under the same condition is fully utilized, the impurities in the hydrogen fluoride are removed, and high-purity hydrogen fluorid