Preparation of anhydrous aluminum fluoride
RESULTS IN CHEMISTRY(2023)
摘要
Because direct roasting of aluminum fluoride hydrate will hydrolysis, resulting in higher alumina content in aluminum fluoride products. To solve this problem, a two-step process for the preparation of anhydrous AlF3 from AlF3.3H2O and NH4HF is described in this paper. First, AlF3.3H2O was dried at 220 degrees C for 9-12 h, and then NH4HF (the mass ratio of AlF3.3H2O to NH4HF was 1:20) was added, and the mixture was roasted from room temperature to 650 degrees C. The results showed that the hydrolysis of aluminum fluoride can be avoided effectively by the two-step roasting method with NH4HF, the purity of the anhydrous AlF3 was 99.8 wt%, and the concentration of alumina, the main impurity, was less than 0.1 wt%.
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关键词
Anhydrous aluminum fluoride, Aluminum electrolyte, Roasting reaction, Two step method
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