SU1320240A1 - Desulfurizing mixture - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular to the compositions of slag-forming mixtures used for steel processing. The aim of the invention is to increase the degree of desulfurization of steel. The mixture contains, in wt.%: Converter slag 25-40; lime- 5-35; sludge production of butadiene 40-55. The use of the mixture for out-of-furnace desulphurization of steel makes it possible to increase the degree of desulphurization by 20%. 1 tab. (L S T to Uib

Description

The invention relates to ferrous metallurgy, in particular to the compositions of slag-forming mixtures used for metal processing.

The aim of the invention is to increase the degree of desulfurization of steel.

The proposed desulfur bleach contains a converter putty, lime and sludge from the production of butadiene with the following ratio of components, in%:

Converter slag 25-40 Lime 5-35

Butadiene Production Sludge40-55

Butadiene sludge sodozhit, wt.%:

Carbon 10-30

Volatile3-10

Chromium oxide 5-10

Alumina Else Converter Slag contains, May. CaO44-57

10-20 1-2 1-3 10-20 3-10 3-8

0.1-0.4 0.5-1.5

Lime is used commonly used in metallurgical production.

The converter slag in the mixture serves as an oxidizing agent, fluxing component and filler. Its content in the mixture of converter slag less than 25 wt.% Does not ensure effective mixing of the components and economy of lime. When the content in the mixture exceeds 40% by weight of the converter pshka, the refining properties of slag decrease, since the SiOj content increases, which leads to an increase in viscosity and an increase in the melt temperature.

Lime is introduced into the desulfurizing mixture to increase its basicity. By reducing the consumption of lime, the need for CaO is replenished by an increase in the consumption of the converter pork. When the mixture contains more than 35% by weight of lime, the resulting slag has a high viscosity and melting point.

Butadiene production sludge performs a deoxidizing and thinning agent.

Due to the presence of AljOj in the sludge, slag can be obtained, which has sufficient fluidity. Carbon monoxide, which is formed by the interaction

carbon and iron oxide, and volatile. substances contribute to the intensive mixing of the slag and the averaging of its composition, create a neutral atmosphere in the ladle. When the content in the mixture is more than 55% by weight of sludge, the melting point of the resulting donkey becomes higher. In addition, due to the release of large amounts of gaseous substances,

material emissions from the bucket. When the content in the mixture is less than 40 wt.% Of tham, the amount of AljOj entering the slag is not enough to liquefy it.

The selected ratio of mixture components allows slags to be obtained with m.p. nSO-UyO C.

The mixture is prepared as follows.

Butadiene production sludge is premixed with lime. During the mixing process, the carbon of the sludge infiltrates and coats the lime particles, creating a burned and non-dusting mass. At the end of the metal purge in the converter, the specified amount is drunk into the casting ladle. Converter lshaka. After incorporation into the molten converter slag

lime and sludge intensive interaction of the sludge carbon with the liquid phase occurs, the release of volatile substances and due to this the mixing of the components. After the mixing is stopped and a uniform slag is formed in the ladle, steel is released into the ladle. The consumption of the mixture is 30-80 kg / t of the steel being processed.

Example. Testing of the desulfurizing mixture of compounds 1-10 (see table) was carried out in the smelting of carbon steel in an oxygen converter. After blowing metal into the steel-teeming ladle, the final converter putty was poured in the amount of 10-30 kg / t of the steel being processed. A mixture of lime and sludge was added to the slag.

After termination of the slag deacidification reaction, the steel semi-product was poured into the ladle from the converter. During the release of the melt, metal flow and alloying agents were introduced into the metal stream.

31320240

providing steel of a given chemical composition.

The test data in the table shows that it used

bath mixture containing components of butadiene production at the following

Claims (1)

in the proposed ratios, it allows to increase the degree of desulfurization of steel by about 20%. Invention Formula Desulfurizing mixture, containing | Q sch converter and slag and lime, about the ratio of components, wt.%: Converter Slag Lime Sludge production butadiene 25-40 5-35 40-55 Desulfurizing mixture The content of components in desulgi riating mixture, wt.% Lime Butadiene Production Sludge one 2 3 four five 6 7 eight 9 0 (izvestna)  five 20 35 40 2.5 37.5 2.5 37.5 50 57.5 55 47.5 40 37.5 60 35 52.5 42.5 Compiled by K. Sorokin. Editor I. Rybchenko Tehred A. Kravchuk Proofreader A. Obruchar  - ------------------ - ™.-. --- .-----. ™. In., -. “C. ..“. C. c.-., "in" and and .... in,. "...„ ..,. Order 2613/23 Circulation 549Subscription VGOSHPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 . Production and printing company, Uzhgorod, Projecto st., 4 that, in order to increase the degree of desulfurization of steel, it additionally contains ra; acidifier and thinner - sludge the ratio of components, wt.%: Converter Slag Lime Sludge production butadiene The degree of desulfurization of steel Converter pshak Slag electrothermal production of silumin 20 63 73 85 71 59 66 62 69 63 60