Influence of EBT Sand Granulometry on the Free Open Ratio in the EAF

oleh Esther GÓmez, Pamela DÍaz, Esteban RuisÁnchez, Javier MartÍnez

Penerbit - Pasek Minerales S.A.U. (Mina Dunita Landoy, Cariño / A Coruña 15360, Spain)

Kategori - Kejuruteraan & IT

PASEK Minerales extracts and commercializes a rock called dunite from a mine located in the Spanish region of Galicia. Its chemical classification is basic, being olivine and serpentine its principal minerals. The mineralogical composition and physico-mechanical properties makes Dunite PM is a suitable material for use as EBT filler sand in Electric Arc Furnaces. The working principle is based on the formation of a thin layer of fused dunite, in direct contact with the molten steel, which is supported by a body of sand grains. This sealing offers the following advantages: (i) avoids molten steel propagation down the tap hole; (ii) abrupt temperature drops along the tap hole; (iii) shorter times between tap to tap due to the fast free opening In order to offer an EBT sand adapted to each client, the company has carried out several projects to evaluate the behavior of the EBT sand during the casting process. In this way, Pasek Minerales has developed a simulation program based on the finite element method to determine the most suitable EBT sand according to a series of operating parameters of each customer (process temperature, dimensions of tap hole, type of sand...), with the aim of ensuring sand opening ratios higher than 97%. PASEK Minerales extracts and commercializes a rock called dunite from a mine located in the Spanish region of Galicia. Its chemical classification is basic, being olivine and serpentine its principal minerals. The mineralogical composition and physico-mechanical properties makes Dunite PM is a suitable material for use as EBT filler sand in Electric Arc Furnaces. The working principle is based on the formation of a thin layer of fused dunite, in direct contact with the molten steel, which is supported by a body of sand grains. This sealing offers the following advantages: (i) avoids molten steel propagation down the tap hole; (ii) abrupt temperature drops along the tap hole; (iii) shorter times between tap to tap due to the fast free opening In order to offer an EBT sand adapted to each client, the company has carried out several projects to evaluate the behavior of the EBT sand during the casting process. In this way, Pasek Minerales has developed a simulation program based on the finite element method to determine the most suitable EBT sand according to a series of operating parameters of each customer (process temperature, dimensions of tap hole, type of sand...), with the aim of ensuring sand opening ratios higher than 97%.

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