SU515799A1 - The method of desulfurization of iron-carbon melts - Google Patents

Description

one

Known are the desulfurization of iron and steel, which are solid chlorine-containing compounds (sodium chloride, chloride, calcium), soda, norio-like lime, silage, magnesium, and liquid synthetic slags.

Methods are also known to desulfurize iron-carbonic melts by blowing various basins with solid desulfurizing materials into them, for example, the process of blowing liquid metals, especially iron and steel, to desulfurize them with desulfurizing reagents (lime, dolomitized molds; Oxides of alkali and rare metals or their mixtures), introduced into the metal bath in the state of fine dispersion with high pressure gases (I).

However, with such methods, a relatively low desulfurization rate of the metal was noted due to the possible reversibility of this process, since sulfur is nonrecurrent into the compound (CaS, MgS, Na2S, K2S, etc.) remaining in the slag phase. In addition, desulfurization of metal by injecting solid reagents into its reagents is associated with the necessity of grinding them and constructing complex, working Hj, HX under pressure, devices for transporting a desulphurizer in the bulk of the metal.

2

The purpose of the invention is to provide deep desulfurization and degassing.

D, h of this, according to the proposed method, a liquid megalol is blown with bunks of 20.2% hydrochloric acid introduced in an amount of 0.6–0.7 m with 0.01% sulfur per 1 ton of metal into the melt with the help of a gas (oxidizing , restorative or neutral - depending on the nature of the techno, the togic process). In this desulfurprusion component is hydrochloric acid vapor, reacting with cepoii metha, tala, and reaction;

FeS + 2HCI I28 („:

Fed .:

The final reaction products, being at a process temperature (1300-1700 ° C) gaseous substances, cause additional melt sparging and removal of gases and non-metallic inclusions from it.

Claims (3)

The proposed method of desulfurization can be used in mass production of iron and steel - blast furnace, open-hearth, oxygen-converter, Bessemer, electric steel melting, while the metal desulfurization process can be carried out both directly in the smelting units and outside the unit (when blowing metal in ). Below are examples of the implementation of the proposed method of desulfurization of metal. Example 1. Diluted hydrochloric acid vapors are injected into an air blast of a Bessemer-type converter. Example 2. In the production of steel in oxygen converters, hydrochloric acid vapors without special technical difficulties are introduced into the oxygen blast in a similar manner to water as it is carried out on the well-known oxygen-blowing iron in the converter. Example 3. Desulfurization of the metal can be carried out in gauntlets, the introduction of hydrochloric acid vapors into the inert gas used to blow the melt. The theoretical flow rate of 1 concentrated hydrochloric acid is about 0.03% by weight of the melt to be treated for each 0.01% of sulfur removed from it. The proposed desulfurization method is distinguished by high manufacturability, providing a deep degree of metal desulfurization due to the irreversibility of the process, allows to significantly increase the productivity of the smelting units, reduce, and in some cases eliminate, the consumption of hot-melting materials. The best effect of the proposed method of desulfurization will give in the conditions of vacuum metal processing. The proposed desulphurisation method does not pose a risk of contaminating the environment with chlorine, since the latter binds completely to the compound FES. Pe also represents a danger of poisoning the atmosphere with hydrogen sulfide, since H2S can be neutralized with water in which it is well soluble. The invention of the method for desulfurization of iron-carbon melts, which consists in the melting of the melt with a desulfurizing agent, which is injected so that, in order to ensure deep desulfurization and degassing, a vapor of 20.2% of the solution is blown into the melt hydrochloric acid, 0.6 - 0.7 m for every 0.01% of sulfur per 1 ton of metal. Sources of information taken into account in the examination. 1. Patent number 1168646, Cl. From 21c, France, 21.02.57.