SU653298A1 - Charge for obtaining synthetic slag - Google Patents

Description

(54) CHARGE TO GET SYNTHETIC SLAG Fluke spar5--7 LimeExtra Application of synthetic slag, obtained from this mixture for steel alloying with vanadium and niobium, reduces the cost of niobium-containing and vanadium-containing steel. This is achieved by the fact that the synthetic slag is combined with the smelting of vanadium master alloy by reducing it; It was made of vanadium slag converter production, the cost of which is significantly lower than the cost of ferrov1-. t nadi .-. In addition, the obtained with the use of the well-known steel batch, have higher - TG: Sha with the same indicators and impact viscosity (for example, for the same steel 12X1 IFA, the relative elongation is 25%, the relative narrowing is 75%, the impact viscosity 18 kgf-m / cm), due to the increased desulfurizing ability of the resulting synthetic slag (degree of desulfurization 45-600 / 0). However, the cost of the steel obtained using this mixture remains quite high. The purpose of the invention is to reduce the cost of steel. For this, a mixture of vanadium slag, a reducing agent and lime is additionally introduced into the charge to obtain a TiWeCKOfo slag synthesis, with the following ratio of ingredients, weight. %: Vanadium slag. 40-50 Reducing agent 15-20 Pyrochloric concentrate 2-12 LimeEverything While this pyrochloric concentrate has the following composition, weight. %: Niobium thioxide 20-40 Silica 10-12 Titanium dioxide 10-12 Calcium oxide -14-18 Oxides of the silk-earth metals. The remaining Introduction of pyrochloric concentrate to the charge will reduce the cost of steel due to the elimination of expensive ferroniobium, which is added to the alloyed and alloying materials, which are used for expensive ferroniobium, which is added to the oxidizer and the alloying material, which is used for expensive ferroniobi, which is added to the oxidizer and alloying, which will be used for the expensive ferroniobi, which is added to the oxidizer and the alloying material, which will be used for the expensive ferroniobi, which is added to the alloy, and the alloying material that is used for expensive ferroniobi, which is added to the oxidizer, will lower and alloying. when using synthetic slag obtained from the known charge 2. The mechanical properties of the steel, in particular 12X1MFB, are at the same level as that of the steel smelted using the known charge. The use of pyrochloric concentrate within the specified limits is explained by the fact. The IronMine content of any obi in steel (0.02%), it is necessary to introduce into Sastav synthetic slag at least 2% pyrochloric concentrate. The introduction of more than 12% pyrochloro-O concentrate into the slag mixture is impractical because the retention of niobium in steel will be more than 12%, and at the same time no further increase in the mechanical properties of the flock is observed, but its cost increases. Below is an example of the use of the written charge in the smelting of steel 2H1MFB combined process. The open-hearth billet (smelting NZ-844) was melted in the main open-hearth furnace with a capacity of 70 tons according to the existing technology in the enterprise. Liquid alloying alloy and synthetic slag were prepared in 5-ton electric. During the smelting of a liquid master alloy, electric furnaces were loaded in kg: Waste from carbon steel 700 Ferromanganese blast 250 45% FeSi580 Ferrochrome 800200 Ferrochrome 100620 During smelting, to prevent oxidation of the charge in the furnace, they gave 200 kg to lead. After dissolving the electrical fluxes, synthetic slags began to be induced into the electric trails. For slagging, an electric furnace was loaded, kg: Vanadium-containing slag985 Pyrochloric concentrate (Nba0.34%) 150 Aluminum waste (reducing agent), 340 Lime1400 45% FeSi .50 Pyrochlorine concentrate has the following composition, weight,%: Pyioxy 20% titanium 10-12 Silica 10 -12 Calcium oxide 14-18 Oxides of silk-earth metals Remaining The chemical composition of the synthetised slag obtained is as follows,%: The chemical composition of the Liquid master alloy after the release is as follows,%:

V. .4,75

NS0.57

In the open-hearth metal before release contained,%:. C, 0.08

MP0.16

Cg0.12

, P0.01

. S.0.023

Mo0.29

After the release of the -marten billet and processing it with synthetic slag with a liquid alloy, the following chemical composition of steel was obtained,%:

S0,13

Mp0,63

Cr1,12

Si0.37

Р0,014

S0,012

Mo0,28

Y0.23

Nt0.05

Ni0.17

C0.21

The resulting chemical composition satisfies 4MTU-1-668-69.

The content of pyrochlore concentrate and niobium for MPX steel 12X1 is given in the table.

5.2

- 1844 0.02 3543 2.0

12.0 1890 1.0 - 3022

14.0 - 6415

As can be seen from the table, the introduction of pyrochlore concentrate into the charge in an amount of less than 2 ° / o and more than 12% does not provide the required niobium content for 12H1MFB steel, which in turn leads either to a decrease in mechanical properties (melting Hi - 3022), or to the rise in the cost of steel (smelting Hi - 6415).

Experimental testing showed that the cost of one ton of steel smelted using the proposed mixture, decreased by 1.5 rubles. while maintaining the quality of the metal.

Claims (2)

Invention Formula 15 . 1. A mixture for obtaining synthetic slag, containing vanadium slag, a reducing agent and lime, characterized in that, in order to reduce the cost of steel, pyrochlore concentrate is additionally introduced into the mixture in the following ratio of ingredients, weight. %: Vanadium slag40-50 Restorer 15-20 Pyrochloric five concentrate2-12 LimeEverything 2. The mixture in accordance with claim 1, wherein the pyrochloric concentrate has the following composition, wt. %: 0 Niobium thioxide 20-40 10-12 silica 10-12 Titanium dioxide 14-18 Calcium Oxide 0.05 Alkaline oxidesOther metals 35 Sources of information, taken into consideration, 12 1. USSR Author's Certificate 0.01 No. 370243, cl. C 21 C 5/54, 1970 2. USSR author's certificate OD4 0 No. 438708, cl. C 21 C 5/54, 1973.