FIELD: metallurgy.
SUBSTANCE: invention relates to refining hard zinc from aluminium impurities. Method includes melting hard zinc and processing the melt by a flux. A thoroughly mixed mixture consisting of potassium and sodium chlorides, potassium fluoraluminate and ammonium chloride, is used as a flux, at the following weight ratios, wt.%: potassium chloride 20 to 30, sodium chloride 12 to 20, potassium fluoroluminate 30, ammonium chloride 20 to 30. The releasing hydrogen is removed with process waste gases.
EFFECT: method reduces the consumption of ammonium chloride.
1 cl, 1 tbl, 2 ex
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