SU1073315A1 - Charge for producing ferrovanadium - Google Patents

Abstract

The CHARGE FOR PREPARING FERRANOVADIUM, including vanadium pentoxide, ferrosilicon, aluminum, metal scrap and lime, characterized in that, in order to reduce the phosphorus, manganese and carbon content in the alloy, to increase the durability of the furnace lining and productivity, it additionally contains iron oxides in the following Ratio of components, May.%: Vanadium thioxide 25-35 10-18 Ferrosilicon 1.5-5.0 Aluminum 0.5-8.0 Metal waste 3-15 Iron oxides Ostrov Lime O: A :)

Description

The invention relates to a metal sheet, in particular to the production of ferroalloys, namely, ferroalloy. The known charge for the production of ferrovanadium is of the following composition by weight:% polyoxide 25 ferro-silicon 13 Aluminum2 Metal waste 10 Lime Else l. The disadvantage of the charge is high degree of assimilation of harmful impurities obtained by ferrovanadium, in which the phosphorus content exceeds 0.08%, manganese - 1.2%. The closest in composition and achievable effect to the proposed is the charge to produce ferrovanadium with the following ratio of components, wt.%: Vanadium dioxide 31 Ferrosilicium ALUMINUM Metal waste 10 Lime The rest 2 Ferrovanadium smelted i on this mixture meets the requirements of GOST 4760 -49 and contains,%: V 45-50; Si 1.5-2.5; Mp 3-4,5; Р 0.08-0.1; G 0.4-0.6; N, 0.08-0.1. However, for doping special purpose steels, ferrovanadium is required with a content of 0.02-0.2% carbon, 0.4-1.8% / 1gr and not more than 0.02% phosphorus (TU 1 5-98-78, TU-14-193-77-77). The disadvantages of the known mixture include the high content of phosphorus, manganese and carbon in the alloy, low lining durability (refractories consumption is 540 kg per 1 ton of 38% ferrovanadium and low productivity (610 kg of 38% ferrovanadium on mountain | Chii hour), the purpose of the invention is to reduce the phosphorus, manganese and carbon content in the alloy, increasing the lining durability and productivity. The goal is achieved by the fact that the charge for producing ferrovanadium, including PENTIUM, vanadium, ferrosilicon, aluminum, metal wastes and lime, will complement contains iron oxides in the following ratio of components, wt.%: Vanadium dioxide 25-35 Ferrosilicon 10-18 Aluminum 1.5-5.0 0.5-8.0 Metal waste 3-15 Iron oxides Else Lime As oxides iron uses scale, ferrous ore, concentrate, and other materials, mainly iron-ore sintering. Melting the charge contributes to a better absorption of lime, reducing the viscosity of the slag and the formation of a low-melting system. The higher term thermality of the charge ensures its melting due to self-heating when the arcs are turned off and reduces slag overheating by 150-160 ° C, which creates more favorable energy conditions for the process, reduces the transition rate of manganese and phosphorus into the metal and prevents carburization of the metal. This reduces power consumption and increases furnace productivity. The rapid recovery of iron and early assimilation of lime by the melt leads to a relative decrease in the concentration of silicon and aluminum in the metal and an increase in the basicity of intermediate melts, which, together with a low slag temperature, leads to a slow destruction of the slag garnissgyh or to preserve it during the whole melting and thereby ensures less wear of refractories. Carrying out the process on more low-melting slags using the effect of self-heating allows shortening the duration of smelting and, thus, increasing the production of the process, as well as lightening the conditions of lining operation and reducing the consumption of refractories per ton of ferrovanadium. When the consumption of iron oxides in the amount of less than 3% of the heat of exothermic reactions is not enough to carry out the process without the supply of heat from the outside, as a result of which carbonization of the metal occurs, moreover, effective removal of phosphorus and manganese does not occur. With the consumption of iron oxides in the amount of more than 15%, the concentration of vanadium in the alloy becomes lower than permissible. The consumption of aluminum in the charge in an amount of less than 1.5% worsens the initial conditions of reduction as a result of a decrease in the charge thermality and carbonization of the metal. . An excess of aluminum in the charge (more than 5% 3 leads to an undesirable reduction of manganese and phosphorus.

The lack of silicon in the charge (less than 10%) reduces the proportion of silicic acid in the slag and, thus, contributes to the transition of manganese to metals.

An excess of silicon (over 18%) leads to slag overproduction of silica and a decrease in vanadium extraction.

It should be noted that a very significant advantage in the proposed technical injury is that the necessary excess heat is obtained not due to the increased consumption of aluminum (this would lead, as mentioned above, to an undesirable reduction of phosphorus and manganese), but due to the introduction of iron oxides, which to a large extent allows the oxidative capacity of shleak to be increased and the process to be carried out in the absence of contact with electroplating agents.

Examples of ferrovanadium smelting using the proposed mixture are given in table. 1. Melting was carried out by JB arc furnace DS-bN with magnesite footer. Composed

Component Name

The batch was used vanadium pentoxide (TU 14-5-92-77), FS-75 ferrosilicon, ACh-2 granulated aluminum, metal waste (.glume fraction of converter converter 11C1ac tto VIADI 11-1-178-79.). The charge is charged in batches.

The chemical composition of the preparation is given in table. 2

In tab. 3 shows the effect

0 composition of the charge on the consumption of refractories and on the performance of the furnace At the hot hour. .

An analysis of the results obtained shows that the use of a premix of the charge dp for ferrovanadium smelting makes it possible simultaneously to reduce the content in the alloy of phosphorus, carbon, manganese, silicon and nitrogen. At the same time, the lining durability increases 2.8-3 times, and the productivity of the furnace increases 1.5-1.6 times.

The economic effect in the production of 1 ton of ferrovanadium on the proposed charge due to an increase in the quality of the metal and a reduction in the consumption of non-stoppers will amount to about 900 thousand.

rub. in year.

i. . BUT .

I T a b L (and c a 1

The composition of the mixture, wt.%

table 2

Refractory consumption, kg / t 38% ferrovanadium

Furnace productivity, kg 38% ferrovanadi / h

289 182 176 188 184

925 940 960 938 914

Claims (1)

MIXTURE FOR PRODUCING FERROVANADIUM, including vanadium pentoxide, ferrosilicon, aluminum, metal waste and lime, characterized in that, in order to reduce the content of phosphorus, manganese and carbon in the alloy, to increase the lining resistance and furnace productivity, it additionally contains iron oxides in the next ratio of components, May.%: Vanadium Pentoxide 25-35 Ferrosilicon Aluminum Metal waste Iron oxide 10-18 1,5-5,0 0.5-8.0 3-15 Lime The rest _aa SU, „1073315> I