Elkem Asa

Svein Harsaker

Magne Dastol

Eldar O Dingsoyr

Halvard Tveit

Per Ronning

The present invention relates to a method for producing microsilica having a reflectivity between 65 and 90% in a smelting furnace for production of ferrosilicon or silicon by using a charge comprising an SiO source and a solid carbonaceous reduction agent, where microsilica is recovered from the off-gases from the smelting furnace, wherein the solid reduction agent supplied to the furnace contains an amount of volatile matters of less than 1.25 kg per kg produced microsilica and that the temperature in the gas atmosphere in the furnace above the charge is kept above 500&deg; C.

Growing community of inventors

Orkanger, Norway

Svein Harsaker