Elkem Asa

Sinvent As

Elkem As

Gabriella Maria Tranell

Erik Enebakk

Ragnar Tronstad

Casper Van Der Eijk

Leiv Olav Kolbeinsen

Oystein Grong

Øystein Grong

Ragnar Tronstrad

The present invention concerns a new type of grain refiners for steel, in the form of a particulate composite material, containing a high volume fraction of tailor-made dispersed particles, with the purpose of acting as potent heterogeneous nucleation sites for iron crystals during solidification and subsequent thermo-mechanical treatment of the steel. The material comprises a position of particles of XSor XOand the element(s) X, where X is one or more elements selected from the group Ce, La, Pr, Nd, Y, Ti, Al, Zr, Ca, Ba, Sr, Mg, Si, Mn, Cr, V, B, Nb, Mo and Fe, and S is sulphur, (O is oxygen), wherein said material additionally contains oxygen, sulphur, carbon and nitrogen, wherein the sulphur (or oxygen) content is between 2 and 30% by weight of said material, while the total content of oxygen (or sulphur), carbon and nitrogen and said other elements selected from the group X is between 98 and 70% by weight of said material, and the said material contains a high volume fraction of finely dispersed XSor XOparticles embedded in a metallic matrix X. The invention further concerns methods for production and use of the composite material.

Grain refiners for steel-manufacturing methods and use

The present invention concerns a new type of grain refiners for steel, in the form of a particulate composite material, containing a high volume fraction of tailor-made dispersed particles, with the purpose of acting as potent heterogeneous nucleation sites for iron crystals during solidification and subsequent thermo-mechanical treatment of the steel. The material comprises a composition of particles of XSor XOand the element(s) X, where X is one or more elements selected from the group Ce, La, Pr, Nd, Y, Ti, Al, Zr, Ca, Ba, Sr, Mg, Si, Mn, Cr, V, B, Nb, Mo and Fe, and S is sulphur, (O is oxygen), wherein said material additionally contains oxygen, sulphur, carbon and nitrogen, wherein the sulphur (or oxygen) content is between 2 and 30% by weight of said material, while the total content of oxygen (or sulphur), carbon and nitrogen and said other elements selected from the group X is between 98 and 70% by weight of said material, and the said material contains a high volume fraction of finely dispersed XSor XOparticles embedded in a metallic matrix X. The invention further concerns methods for production and use of the composite material.

The present invention relates to a calcium-silicate based slag having a phosphorus content of less than 3 ppmw. The invention further relates to a method for producing low phosphorus calcium-silicate based slag, where molten calcium-silicate based slag is treated with a molten ferrosilicon alloy in a vessel, whereby phosphorus in the calcium-silicate based slag is transferred to the ferrosilicon alloy, and a low phosphorus calcium-silicate based slag is removed from the vessel.

Calcium-silicate based slag for treatment of molten steel

The present invention relates to a calcium-silicate based slag having a phosphorous content of less than 3 ppmw. The invention further relates to a method for producing a low phosphorous calcium-silicate based slag, where molten calcium-silicate based slag is treated with a molten ferrosilicon alloy in a vessel, whereby phosphorous in the calcium-silicate based slag is transferred to the ferrosilicon alloy, and a low phosphorous calcium-silicate to based slag is removed from the vessel.

Calcium-silicate based slag for treatment of molten silicon

A method for making solar grade silicon from metallurgical grade silicon is accomplished by treating a calcium silicate based slag with ferrosilicon in the first vessel so as to obtain a purification of the calcium silicate based slag. In a second vessel, the purified calcium based silicate slag is used to treat metallurgical grade silicon in order to obtain a solar grade silicon. The purification of calcium silicate based slag in the first vessel is accomplished to reduce phosphorous to a level of less than 3 ppmw.

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Trondheim, Norway

Gabriella Maria Tranell