FIELD: metallurgy.
SUBSTANCE: proposed method comprises bismuth fusing. Note here that bismuth is fused with sodium hydroxide flux. Then, metallic sodium or bismuth-sodium addition alloy is introduced into bismuth melt. Amount of sodium or sodium in said bismuth-sodium addition alloy makes 0.1-0.3 wt %. Then, said melt is mixed at 340-360°C. Thereafter, melt cleaned of polonium is settled to remove alkaline fusion cake. Note that said melt is mixed at 340-360°C for 2 to 3 hours while settling is performed for, at least, one hour. Thereafter, melt cleaned of polonium is additionally treated by the mix of sodium hydroxide and sodium nitrate.
EFFECT: higher yield and efficiency.
4 cl, 10 ex
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