FIELD: silicon production. SUBSTANCE: invention relates to removing impurities from silicon melt by way of treating silicon melt placed in vessel with slag capable to remove impurities, in particular, boron. Slag is continuously added to melt and simultaneously inactivated or removed from melt as soon as equilibrium between slag and silicon melt regarding impurities is achieved. EFFECT: simplified process and reduced cost. 10 cl, 2 dwg
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