Ammonium fluoroborate is obtained by fluorinating boric acid with 40% HF and then neutralizing it with ammonia. It can also be made from ammonium fluoride, boric acid and potassium hydroxide.
Specific steps are:
(1) add 35%-50% potassium hydroxide solution in the reaction tank, and then add boric acid at room temperature, when the boric acid is completely dissolved, the temperature reaches 80 C-110 C, and continue to stir for 10-30 minutes, to produce a mixed solution;
(2) ammonium fluoride solution into the concentration of the reaction tank, and add the desired (2) The ammonium fluoride solution is pumped into the concentration reaction tank, and the desired mixed solution is added, and after the addition is completed, the temperature is raised and concentrated, and the solid ammonium fluoroborate gradually precipitates out in the process of concentration, and the ammonium fluoroborate ointment is obtained;
(3) The ammonium fluoroborate ointment is dried, and the finished product can be produced.
