CS249886B1 - A method of producing iron-titanium-aluminum-silicon alloys - Google Patents

Abstract

The solution relates to a method of producing an iron-titanium-aluminum-silicon alloy in an electric arc furnace. First, a basic charge consisting of an iron-bearing raw material, e.g. ilmenite, (aluminum or its alloy, ferrosilicon and a slag-forming additive such as lime, is melted. After melting, a secondary raw material containing metallic titanium or its alloy is added to the formed slag in an amount corresponding to 1 to 100% of the desired weight fraction of titanium in the produced alloy.

Description

The present invention relates to a method for producing an iron-titanium-aluminum-silicon alloy in an electric arc furnace. First, the base charge formed by the iron-bearing raw material, e.g., ilmenite, is melted (aluminum or its alloy, ferro-silicon and slag-forming additive such as lime. After melting, the secondary raw material containing titanium metal, or its alloy, is deposited below 1 to 100). % of the desired titanium weight fraction in the produced alloy 249886 249 3

The present invention relates to a method for producing iron-titanium-aluminum-silicon alloys in an electric arc furnace.

The prior art alloys of iron-titanium-aluminum-silicon are based on the reduction of titanium oxides from oxidic titanium raw materials in an electric arc furnace using aluminum and silicon. Lime is used as a slag additive. These production processes are characterized by high consumption of deficient aluminum needed to reduce titanium oxides, high energy demands on unit production of alloy, high slag shortness, which affects the absolute loss of titanium by slag and insufficient compactness of the produced alloy. However, the tendency to increase the titanium content of the alloy is associated with a sharp increase in aluminum consumption.

The aforementioned drawbacks are avoided by the production of iron-titanium-aluminum-silicon alloys in which a mixture of iron-bearing raw material such as ilmenite, ferro-silicon, aluminum or aluminum alloys and slag-forming additives such as lime is melted according to the invention. whereas, after melting the mixture, a piece or compact secondary raw material containing titanium metal or an alloy thereof is deposited under the slag layer in an amount corresponding to 1 to 10% of the desired titanium by weight in the produced alloy. An advantage of the process according to the invention is that the produced alloy is enriched with 95 to 98% utilization of the titanium loaded, since the slag layer formed prevents oxidation of the titanium. Further, the advantage of the solution according to the invention is that the consumption of deficient aluminum is substantially reduced, the power consumption per unit of production is reduced, the slag shorter, the kiln aggregate productivity is increased, and the titanium bearing waste is most importantly used that cannot be used otherwise.

The subject matter of the invention is illustrated by the following examples. Example 1

86 4 ilmenite FeTiO 1 700 kg, CaO lime 1060 kg, aluminum waste 300 kg, aluminum pellets 380 kg, aluminum blocks 550 µg and ferro-silicon FeSi 75% 600 kg were charged into an electric arc furnace. This batch was melted and 160 kg of briquetted chips of titanium alloys containing 92% by weight were placed under the slag 30 minutes before the end of the melt. titanium Ti. 2,100 kilograms of alloy were produced, with a chemical composition of 28.3% titanium Ti, 20.4% Si, 16%, 5% aluminum Al, Fe iron. The use of titanium was 95.2 percent. Power consumption was 1.4 ikWh. kg-1 alloy. Example 2

1400 kg ilmenite, 900 kg lime, 300 kg aluminum waste, 700 kg aluminum blocks and FeSi 75% 700 kg ferrosilicon were charged into the electric arc furnace. This batch was melted and 300 kg of titanium alloy slag bricks containing 92% by weight of the titanium alloys were placed under the slag 30 minutes before the end of the melt. titanium. 2,100 kg of alloy was produced, with a chemical composition of 30.6 percent by weight of titanium, 21.0 percent silicon, 18.0 percent aluminum, iron remaining. The use of titanium was 96%. Electricity consumption was 1.35 kWh. . kg-1 alloy. Example 3

Into the electric arc furnace, ilmenite 1000 kg, lime 900 kg, aluminum waste 300 kg, aluminum blocks 550 kg and ferro-silicon FeSi 75% 700 kg were charged. This batch was melted and 500 kg of titanium alloy slag bricks containing 92% by weight of the titanium alloys were placed under the slag 30 minutes before the end of the melt. titanium. 2,200 kg of alloy was produced, with a chemical composition of 32.1 percent by weight titanium, 20.6 percent silicon, 18.6 percent aluminum, and iron remaining. The use of titanium was 96%. Electricity consumption was 1.3, kWh. .kg'1 alloy.

Claims (1)

SUBJECT A process for producing iron-titanium-aluminum-silicon alloys in which a mixture of an iron-bearing raw material, such as e.g. ilmenite, ferrisilicon, aluminum or aluminum alloys and waxes such as lime, characterized in that after melting the mixture, under the layer formed The slags are charged with a lump or compact secondary raw material containing titanium metal or an alloy thereof in an amount corresponding to 1 to 100% by weight of the titanium in the alloy produced.