| 摘要 |
PROBLEM TO BE SOLVED: To continuously produce sodium fluoride from a sodium hydroxide soln. and hydrofluoric acid. SOLUTION: A sodium hydroxide soln. having <45 wt.%, preferably 20-40 wt.% concn. and hydrogen fluoride or hydrofluoric acid are separately introduced into a satd. NaF soln. prepd. by suspending 4-50 wt.%, preferably 5-30 wt.% solid NaF and adjusting a temp. to 20-80 deg.C, preferably 30-600 deg.C.
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