METHOD FOR WASTE-FREE PRODUCTION OF ALLOY OF IRON -CONTAINING CHARGE Russian patent published in 2006 - IPC C22C33/04 

FIELD: metallurgy, namely production of alloy with stainless properties including iron as main component.

SUBSTANCE: method is realized at using melting with rotation and liquid phase reduction. Iron-containing charge is melt on metallic phase according to calculated doze of ferrosilicon. Part of iron contained in ferrosilicon and added to ferrosilicon melt at reduction of iron oxides from melt charge is remained in melting chamber. Before providing predetermined chemical composition of iron alloy, metals reduced from secondary slag by means of aluminum are added to remained iron for producing tertiary slag. Metals characterized by free energy of oxide formation exceeding that of silicon are transferred from newly prepared liquid metallic phase back to tertiary slag in order to produce ferrosilicon and replenished tertiary slag. Metals of replenished tertiary slag are added to remained ferrosilicon for reducing them by means of aluminum while adding designed quantity of calcium oxide to final slag. Then tap holes are successively open and remained ferrosilicon with added metals is poured off through tap hole for metal draining and final slag is poured off through tap hole for draining slag. After pouring off operations tap holes are closed and preliminarily reduced iron is returned to melting chamber from special tank and subjected to rotation; metals are dissolved in it according to predetermined chemical composition. Alloy is completely poured off from melting chamber of melting aggregate and after closing tap hole preliminarily poured off liquid ferrosilicon is added to melting chamber where its is subjected to rotation and next batch of iron containing charge is fed. Invention provides possibility to add titanium from replenished tertiary slag to remained ferrosilicon for producing master alloy containing iron, silicon and titanium till 50%. It is also allows to dissolve in preliminarily reduced iron returned to melting chamber such metals that provide stainless properties of alloy in merchant metallic products being no less than such properties of chrome-nickel steel. For example, it is possible to dissolve metallic chrome in quantity sufficient for achieving its content in alloy 10 -20% or to dissolve metallic chrome, nickel, titanium for achieving their content in alloy respectively 18%, 10% and up to 1%.

EFFECT: enhanced efficiency of process, improved quality of alloy.

5 cl, 1 dwg, 1 ex