SU939564A1 - Reagent for thinning melallurgical and refining slags - Google Patents

Description

The invention relates to ferrous metallurgy and for the dilution of slag.

Known thinner steelmaking slag - catalyst K-5 C1] ·

However, the use of catalyst K ~ 5 is limited by the presence in it of up to 20% silica and its rather high cost (up to 80 rubles per 1 ton).

In recent years, a number of factories use staurolite concentrate, which is a by-product formed during the processing of polymetallic ores, as a diluent for steelmaking slag [2]. The chemical composition is as follows, wt.%:

Alqoy 48-50 dusty powder fraction up S ΙΟίχ 25-28 70 microns and has the following chemical GeoR ", 13-15 composition, wt.%: Ti0 _α 2-3 Al 2.O3 68-76 ΖΓΟη 1.0-1.5 20 S ΐ 0 J 8-10 The lack of stavrolithogone concentrate Cr qO-j 7-10 rata - the presence of significant to _r about 2-3 quantity silica (up to 30%) for FeO ^< 'J binding which in slag is necessary bulk density 1.5 g / cm.

I can also add lime, in addition, the concentrate contains up to 15% of iron oxides, which increase the oxidation of slag.

The purpose of the invention is the improvement of the process of slag formation, waste disposal of the chemical industry and reducing the cost of refining.

This goal is achieved by using a spent catalyst for the production of synthetic rubber as a reagent for liquefying metallurgical and refined slags in steel production.

The specified material represents

The IM-2201 catalyst does not find proper use in the national economy and is mainly exported to the dumps by the corresponding enterprises, thereby worsening the ecology of the environment. The IM-2201 catalyst can be successfully used in the metallurgical industry both as a pure diluent to intensify the formation of steelmaking slags and, as a liquefying component, in solid slag-forming mixtures to produce refined slags. Its advantage is obvious even in comparison with the K-5 catalyst, half the silica content, the presence of a strong thinner KqO - 2 ^_ 3%, low cost (10-15 rubles per 1 ton) “Having a fine fraction, almost dusty material, the catalyst can successfully used to blow it into the bath with the help of known devices.

In consumer plants, the use of IM-2201 catalyst waste does not require any special equipment or additional measures.

Examples of the use of waste catalyst IM-2201.

1. IM-2201 catalyst waste is delivered to a metallurgical plant in covered gondola cars or cement trucks and stored in special reinforced concrete bunkers in the bulk materials department.

On the furnace span of the open-hearth shop, the waste is delivered in tons and introduced into the furnace for the ka during the polishing period by the polishing machine.

In order to avoid waste entrainment and clogging of slag by them, they are added to the slag surface with a minimum supply of air and gas to the furnace or their complete shutdown. Testing the use of waste catalyst IM-2201 for liquefaction and induction of slag on 300 tons of open-hearth furnaces shows that the length of the time for finishing the smelting, compared with the use of bauxite, decreased on average by

939564 4 min, pure bale improved and slag oxidation decreased (FeO content in slag decreased from 22 to 17%) · This, in turn, contributes to a better occurrence of metal desulfurization and dephosphorization processes and deeper preliminary dissolution.

The use of IM-2201 catalyst waste in double-hearth steelmaking units is possible by filling in a mixture with limestone or on the surface of the slag waste with less than full lime, not

2. Catalyst waste IM-2201 is used as a fluidizing component in a solid slag-forming mixture composition,

Calcined lime. Catalyst IM-2201 Sludge and feldspar.

1.5% of the mass of metal on low and medium carbon steels receive a degree of desulfurization on average 43%. An approximate calculation showed that using IM-2201 catalyst waste as a slag thinner can be obtained economically in

IS

EO liquefaction slag filling dust-like during lapping. Pouring a mixture promotes boron dissolution and assimilation, reducing the basicity of slag.

weight.% :

55-65

25-40

5-10 mixtures for processing 1,0y effect in the amount of 150-250 thousand rubles. year.

Claims (2)

(St) REAGENT FOR DILUTING METALLURGICAL AND REFINING SLAGS The invention relates to ferrous metallurgy and relates to diluting slag. A thinner of steelmaking slag is known - K-5 catalyst 1. However, the use of K-5 catalyst is limited to 20% silica in it, and K-5 catalyst is used. cost (up to 80 rubles. Per 1 ton). In recent years, staurolite concentrate has been used as a diluent for steel-smelting slags in a number of factories, which is a by-product resulting from the hardening of polymetallic ORD 2. Its chemical composition is 2-3 ZrO (i, 1.0-1.5 Lack of staurolite concentrate - the presence in it of a significant amount of silica (up to 30%) to bind which in the slag it is necessary to additionally add lime, in addition, the concentrate contains up to 15 % iron oxides that increase the oxidation of slag The aim of the invention is to improve the slagging process, to utilize the wastes of the chemical industry and reduce the cost of refining. and has the following chemical composition, weight D: FeO 1.5 g / cm3 mass The catalyst IM-2201 does not find proper use in n native host ystve and mainly vyvozits respective enterprise E in the blade thereby deteriorating the environment Ambient environment. The IM-2201 catalyst can be successfully used in the metallurgical industry as a pure diluent to intensify the formation of steel slag and as a thinning component in the composition of solid slag-forming mixtures to produce refined slag. Its advantage is evident even in comparison with the K-5 catalyst — half the silica content, the presence of a strong diluent — 2-3, the cost is low (10–15 rubles per ton). Having a fine fraction, a practically pulverized material, the catalyst can be successfully used to blow it into the bath using known devices. In consumer plants, the use of catalyst waste IM-2201 does not require any special tools or additional measures. Examples of the use of catalyst waste IM-2201. 1. Waste catalyst IM-2201 is delivered to the metallurgical plant in covered open wagons or cement trucks and stored in special reinforced concrete bins in the bulk materials department. On the kiln span of the open-hearth plant, the waste is delivered in pulp and introduced into the kiln to thin the slag during the polishing period of the melting machine. In order to avoid the entrainment of dust waste and the clogging of slags, they are applied to the slag surface with a minimum supply of air and gas to the furnace or their complete shutdown. Testing the use of IM-2201 catalyst waste for the times of slurry and slag spreading on 300 tons of Martenovsky furnaces shows that the length of time for finishing melting. in comparison with the use of bauxite, it decreased on average by E 4 13 min, the net bale improved and the slag oxidation decreased (the FeO content in the slag decreased from 22 to 1). This in turn contributes to a better course of the processes of desulfurization and dephosphorization of the metal, a deeper preliminary deoxidation. On dual steel-smelting units, the use of IM-2201 catalyst waste may be in the filling mixed with limestone or onto the surface of the slag during the finishing period. The presence of waste in the mixture contributes to a more complete dissolution and absorption of lime, without reducing the basicity of the slag. 2. Waste catalyst IM-2201 is used as a diluting component in a solid slag-containing mixture of composition, wt.%: Calcined 55-65 lime Catalyst IM-2201 P roto k you and 5-10 From the mass of metal on low and medium carbon steels, the average degree of desulfurization is 431. A rough calculation showed that using IM-2201 catalyst waste as a diluent slag can produce an economic effect of 150-250 thousand rubles. in year. Claims The use of spent catalyst for the production of synthetic rubber as a reagent for liquefying metallurgical and refining slags in steelmaking. Sources of information taken into account during the examination 1. USSR author's certificate number 418528, cl. C 21 C 5/52, 1972. 2. USSR Author's Certificate No. 501078, cl. C 21 C 5/52, 197i.