FIELD: metallurgy. SUBSTANCE: vacuum pumping is carried out in two stages. Equipment is evacuated when filling it with mixture at the first stage. The second stage of the evacuation is performed when solidification. Evacuation degree and gas flow rate at the first stage are higher than ones at the second stage. Time of evacuation and flow rate decreasing at the second stage is 0.1 - 2.0 s. EFFECT: improvement of sanitary-hygienic labour conditions.
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