| 摘要 |
The present invention relates to a manufacturing method of a cryolite from hydrofluoric acid waste liquor and, more specifically, a manufacturing method of a high-priced cryolite used as an abrasive from hydrofluoric acid waste liquor whose concentration is high and which is released in a slimming process of glass substrate wherein the manufacturing method of Na_3AlF_6 from hydrofluoric acid comprises a solution generating step of dissolving metal aluminium in hydrofluoric acid waste liquor having HF and generating a solution having H_3AlF_6; and adding Na_2CO_3 or NaOH solution to the H_3AlF_6 solution and settling Na_3AlF_6. |
