SU910825A1 - Alloying mixture - Google Patents

Description

(S) MEATING ELEMENTS

This invention relates to metallurgy and can be used in foundry and steelmaking.

Closest to the proposed. The technical essence and the achieved effect of the invention is a dopant mixture 1-1, containing components in the following amounts, weight .: Ferrosiliconadium 5-50

Carborundum1-10

Lime0,5-20

Fluorspar 0, Vanadium-containing slagEverything else

A disadvantage of the known doping mixture is its high cost (the presence of expensive ferrosilicane copper). The process of vanadium reduction from such a mixture requires a long period of time and high temperatures, since the dissolution of the ferrosilicate bath occurs at 1500 ° C and higher, and also does not provide a deep reduction of iron oxides and vanadium due to the low content of carborundum. To restore vanadium pentoxide and iron oxides contained in 1 G of vanadium slag, 0,, 20 g of carborundum is needed. The specified minimum limits for the content of components in the alloying mixture give the ratio of carborundum to anadium slag only 0.011, which is not enough to achieve an acceptable degree of vanadium recovery .. Even with a content of 10 carborundum and 93% vanadium slag in the mixture, this ratio does not exceed 0.11, i.e. . almost two times lower than necessary, therefore (. with the preferential reduction of iron oxides} the reduction of vanadium pentoxide is difficult, and the recovery of vanadium from the mixture does not exceed 50%.

20

The aim of the invention is to reduce the cost of the alloying mixture, increase the recovery of vanadium and carbon dioxide.

iron from vanadium-containing slags

and intensification of the doping process.

To achieve this goal, the alloying mixture, containing vanadium-containing slag, carborundum and calcium containing component, as feces. It contains limestone for the following component ratio, wt. |: Vanadium-containing slag 70-75 Carborundum 12-16 Known to Else The effect of the doping mixture is based on the active course of the process of reducing vanadium and iron oxides with silicon carbide at temperatures above 1200 ° C, .After entering the alloying. the mixture and its melting, silicon carbide reduces the oxides, iron, CO is contained in the vanadium slag, and then vanadium oxides in order of increasing the affinity for oxygen. The indicated amount of silicon carbide is 1.31, 5 times the stoichiometrically necessary amount, which is sufficient for almost complete extraction of the vanadium and iron contained in the composition. A decrease in the percentage of silicon carbide leads to a decrease in the reduction of vanadium and iron. Increasing the content of silicon carbide in the mixture above the specified limit increases the viscosity of the slag, making it difficult to reduce vanadium and iron. At the same time, silicon carbide consumption increases. Known to, interacting with the liquid metal, decomposes with the formation of CaO and C0g |. The lime produced allows for optimum viscosity of the slag, while the release of COQ contributes to the energetic mixing of the slag and the acceleration of the diffusion processes of the reduction of vanadium and iron. The specified content of vanadium slag in the alloying mixture is determined by

from the ratio of silicon carbide to slag, which, on condition that vanadium is completely removed from the slag, is 0.15-0.20, if there is 12-16% silicon carbide in the mixture, it determines the proportion of vanadium slag. Unlike the known alloying mixture, which is effective when used in the temperature range of 1500–1600 ° C with a processing time of 20–30 min, the proposed composition is effective in processing iron – carbon melts with a temperature of 1015 min. Example: Test melts are carried out in a laboratory furnace with a graphite heater. Weight of cast iron containing weight: C 3.36; Si 2.21; Mp 0.5b; Cr traces; S 0.057 P 0.093, is 1 kg. The alloying mixture is introduced in the amount of S% by weight of the liquid metal at. The holding time is 10 min. In the experimental swimming trunks Vanadium slag is used, containing, wt.%: U, 5; CaO 23.0; SiO, j 19.0; FeO, 8, silicon carbide slurry (Si C) and limestone (99.5% CaCOj). After the breakage, the components are mixed in the proportions indicated in the table, where the results of the experimental heats are given. Carried out the same melting using limestone. alloying mixture. The use of the proposed doping mixture provides, in comparison with the known composition, an increase in vanadium extraction with doping by 1.0-1.2%, an increase in the degree of iron extraction from slag by 25%, a reduction in the alloying time twice and a decrease in the cost of the alloying mixture by 45- 60%. The cost reduction of 1 ton of alloyed iron or steel using the proposed alloying mixture is 19.0-7.22 - 11.78 rubles.

Out50

10 is known

Claims (1)

Invention Formula An alloying mixture containing vanadium containing slag, carborundum and a calcium-containing component, characterized in that, in order to reduce its cost, increase the extraction of vanadium and iron from vanadium-containing slag and intensify the doping process, as a calcium-containing component 98.0 thirty 30.0 ten it contains limestone for the following ratio of components, weight .: Vanadium-containing slag 70-75 Carborundum 12-16 .Knvest the rest Sources of Information taken into account in the examination 1, USSR Author's Certificate No. i42596i, cl. C 22 C 35/00, 197.