Abstract
Heating and melting of mould powders in a steel caster may lead to harmful gaseous emissions into the atmosphere. In the present work the volatility of commercial mould powders used in continuous casting processes was studied by the mass spectrometric Knudsen effusion method. Partial pressures of the vapour phase components were measured under vacuum conditions in the temperature range 50‐1550°C at a heating rate of 100°C/hour. In the temperature interval 50‐600°C gas phase is formed by H2O and CO2. At higher temperatures the principle vapour species are Na, NaF, Na2F2, KF, SiF4, SiF2, SiO, CaF2, and CO. Gaseous AIF3, MgF2 and AIOF were identified less reliably. A preliminary decarburised sample exhibited a noticeably different vaporisation pattern. HF was not detected. Under plant conditions SiF4 was pointed out as the most probable air polluting vapour component.
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