2KReO4 + 16HF + 9KI → 2K2[ReF6] + 3K[II2] + 4KF + 8H2O
Potassium perrhenate react with hydrogen fluoride and potassium iodide to produce potassium hexafluororhenate(IV), potassium diiodoiodate(I), potassium fluoride water. Hydrogen fluoride - concentrated solution. Potassium iodide - solid.