English to Russian Tech/Engineering Metallurgy / Casting

As can readily be seen from the Al-Fe phase diagram, the purer the product stream is made, the less contaminated the downgrade stream will be. However, for an economic process a low volume of a highly contaminated downgrade stream is desirable.
The performance of a basic fractional crystallisation process can be improved by using a multistage or *counter current fractional crystallisation process* but the limit for the contamination of the downgrade stream with the alloying element is determined by the eutectic composition.