METHOD OF PRODUCTION OF AN IRON-MAGNESIUM ALLOY ON A BASE OF SILICON Russian patent published in 2004 - IPC

FIELD: iron and steel industry; production of an iron-magnesium alloy on a base of silicon.

SUBSTANCE: the invention is pertinent to iron and steel industry, in particular, to production of iron - magnesium alloys on a base of the silicon for intended the cast irons inoculation. The method provides for formation of a powdery charge made of ferrosilicon, oxides and fluorides of alloying components, including a magnesium; smelting and doping of ferrosilicon; refrigerating of the alloy and separation of a slag. The charge is formed as three layers located one over another. At that the smelting and doping of ferrosilicon is conducted in the upper layer, in the middle layer they execute precooling of melt of the alloyed ferrosilicon, and in the lower layer of the charge the magnesium silicide is produced which is used for additional doping ferrosilicon. The melt of ferrosilicon is preliminary cooled to the temperature of 1200-1400°С, excluding decomposition of magnesium silicide. At that the upper layer of the charge contains ferrosilicon and magnetite and in the capacity of the alloying components the charge - aluminum, calcium, rare earths and magnesium fluorides. In the capacity of rare earths - cerium group elements: mainly cerium, lanthanum, neodymium, praseodymium, samarium. Alloyed in the charge upper layer ferrosilicon contains: magnesium in amount of no more than 2.5 % from mass of ferrosilicon. The middle layer of the charge is made of calcium fluoride and magnesia oxide in the ratio of (in mass %): 1:0.15-0.20. At that the mass of the middle layer makes 0.62-0.81 % from mass of the upper layer. The low layer of the charge contains a silicon oxide, ferrosilicon and a magnesium. At that the silicon oxide and a magnesium are taken in a stoichiometric ratio necessary for production of magnesium silicide, and in mass ratio of ferrosilicon to a magnesium, equal 0.1-0.15:1. The invention allows to increase a degree of conversion of magnesium in iron - magnesium alloy up to 46 % at magnitude of losses of magnesium in a gas phase of 0.5-0.8 %.

EFFECT: the invention allows to increase a degree of conversion of magnesium in iron - magnesium alloy up to 46 % at magnitude of losses of magnesium in a gas phase of 0.5-0.8 %.

6 cl, 2 ex