UA142228U - BRIQUET FOR STRAIGHT STEEL MELTING - Google Patents

Abstract

The briquette for direct smelting of steel contains waste from processing of dump steel smelting slags of small fraction with the Fezagaln content. not less than 65%, Portland cement and water and additionally contains waste from processing of dump steel smelting slags of average fraction with the content of Fezagaln. not less than 65% and crushed metal shavings.

Description

The useful model belongs to the metallurgical, foundry, and construction industries, and can be used in the technological process of making briquettes for direct smelting of steel from waste processing of waste steelmaking slag and metallurgical production.

Widely known briquettes made from powdered ore materials and metallurgical waste with the use of various types of construction cement as a binding material | see Ravich B.M. Briquetting in non-ferrous and ferrous metallurgy. - M.:

Metallurgy, 1975. - 3. 44-45; Lurie L.A. Briquetting in metallurgy. - M: Metalurgvydannya, 1963. - p. 141-142; Kanaev Y.P., Bondarev A.A. Piling of small ferrosilicon waste. Vol. 3.

Materials of the factory scientific and technical conference, Novokuznetsk, 1997, p. 394-396).

Disadvantages of known briquettes are: - high consumption of grade cement (about 20 95) and water (about 30 95 of water is given for the fluidity of concrete), which will increase the cost of briquettes and worsen the properties of the mixture and briquettes for use in metallurgical production due to the increased content of ballast: cement and water; - low content in the briquettes of the share of useful elements, for example silicon, due to the increased content in the mixture of cement and water; - low activity of a useful element in briquettes, such as silicon, due to the increased content of cement, which blocks the particles of the main material on a much larger area with a strong, low-activity film; - the strength of the briquettes is not high enough.

The closest analogue is the composition of the briquette, declared in the method of obtaining briquettes from powdery materials according to the patent of the Russian Federation Mo 2268246, IPC Соо4828/08 (2006.01), С2281/243 (2006.01), publ. 2006.01.20, containing waste from the processing of waste steelmaking slag of a fine fraction with the content of Rezagal.. not less than 65 95, cement and water.

The above-mentioned briquettes, in order to ensure their functionality, aim to provide such parameters that fully satisfy the requirements of applicability in the process of direct steel smelting. The value of such parameters, for example, under the conditions of OJSC ArcelorMittal Kryvyi

Horn" are given in table 1.

Table 1 measurement value 4 Content of portland cement not more than С

Coo)

The general disadvantage of the above-mentioned briquettes is that their physical and mechanical properties do not meet the parameters according to which this briquette can be used in the process of direct steel smelting, in particular, the parameters of the briquettes, according to the requirements and conditions

OJSC ArcelorMittal Kryvyi Rih, which are listed in Table 1.

This is due to the presence in the briquette of a wide range of components included in the charge, as well as their individual characteristics that affect one or another parameter, in particular, the content of a portion of useful elements in the briquettes, such as silicon, due to the increased content in the mixture of cement and water .

In addition, slag from secondary processing becomes a hygroscopic material, which leads to the gradual appearance of moisture in the briquette. This is the reason for reducing the strength of the briquette and shortening its shelf life. Briquettes gradually lose their strength, and after some time become unsuitable for their further use, as a result of which the parameters and size of briquettes, which affect the quality and parameters of the above briquettes, are not sufficiently researched and established.

The quality of the manufactured briquette depends not only on the initial raw materials (first of all, on the composition and properties of the slag, which also affects the specific density and compressive strength of briquettes of various shapes). Therefore, the briquettes produced by the specified method have a compressive strength of about 85 MPa, a water content of 0.5-95 in terms of the total weight of the briquette, a specific density of 2100 kg/m3, which does not meet the requirements of briquettes intended for use in the process of direct steel smelting.

The useful model is based on the task of improving the briquette for direct steel smelting, by utilizing waste from the processing of steelmaking slag and metalworking and establishing the optimal invariance of the ratio of the components of the briquette in mass 9, to ensure the possibility of obtaining a briquette with stable parameters of applicability in the process of direct steel smelting, and due to this, to increase the volume of recycling waste from the processing of waste steelmaking slags and their return to the technological process of direct steel smelting, to free up useful land areas from the wastes of processing waste slags and thereby reduce their harmful impact on the environment.

The task is solved by the fact that the briquette for direct steel smelting contains waste from the processing of waste steelmaking slag of a fine fraction containing Eezagal. not less than 6595, portland cement and water, according to the useful model, it additionally contains waste from the processing of waste steelmaking slag of the middle fraction with the content of Eetotal. At least 6595 and crushed metal shavings, while the briquette components are taken in the following mass ratio. 9: wastes of processing waste steelmaking slags of fine fraction with the content of Total. Not less than 65 95 64-83 crushed metal shavings 0-30 processing waste of waste steelmaking slag of medium fraction with the content

General Not less than 65 95 0-20 portland cement 7.5-8 water the rest.

A comparative analysis with the closest analogue allows us to conclude that the composition of the proposed briquette differs from the known one by the introduction of new components, namely: waste from the processing of waste steelmaking slag of the medium fraction with the content of Ee. At least 65 95 and crushed metal shavings.

Analysis of known briquettes intended for use in the process of direct steel smelting showed that the components included in the claimed briquette are known. However, their use in briquettes in combination with other components does not provide the briquettes with such properties as they manifest in the claimed briquette, namely obtaining a briquette with stable applicability parameters for their use in the process of direct steel smelting. This made it possible to increase the volume of disposal of waste from the processing of waste steelmaking slag and return it to the process of direct steel smelting, to free up useful land areas from waste and thereby reduce their harmful impact on the environment.

Thus, this composition of components and their ratio in mass. 95 adds a new property to the briquettes, which is that they meet the applicability parameters for use in the direct steel smelting process.

For the experimental verification of the claimed composition, seven types of briquettes with various content of components by weight were prepared. 95 (see Table 2).

The number of components in kg in Table 2 is given based on 1000 kg of initial raw materials according to the recipe.

Table 2

Mo slag and Portland- Water, kg of briquettes and metal fraction (10-40) p/p | fraction (0-10) cement, kg (95) (U) parameters o (0-10) mm, kg (95) mm, kg (90) and mm, Kg (to table 1 1 | 588(588) | - -- 6 yu | 230(23) | 76(76) | obpoein (ZHK 2 | via) | 7-6 YU | go 1 76076) |loo00p0ini 77777

With | 646(646). | -- B yuK| 1840184) | 76(76) |94(94)|yes...:SK"ZHO 4 | 6B2(652) | -----41 4 | 17801178) | 76(76) |94(094)|yes... :KYA)M: 6 | 530053) | 300030) | -- 5 ByuzyuuKZ/| 76(76) |94(094)| yes. -:(Д 7 | 83083) | --- 4 -5yu 4 | - 5BzhyuK KI | 76(76) |94(094)|yes..:// Z

For the preparation of briquettes for direct steel smelting, the initial raw materials were used, as waste from the processing of waste steelmaking slags of a fine fraction with the content of Ee. NE less than 6595, waste from the processing of waste steelmaking slags of the medium fraction with a content of hexagals not less than 6595, crushed metal shavings, portland cement and water in the following ratio of components by mass. 9о: waste processing waste steelmaking slag of fine fraction with content

General Not less than 65 95 64-83 crushed metal shavings 0-30 processing waste of waste steelmaking slag of medium fraction with the content

General Not less than 65 95 0-20 portland cement 7.5-8 water the rest.

Briquettes were obtained by a known method of briquetting, according to which the mixture was prepared by simple mixing of the components, and briquettes from these mixtures were obtained by forming the resulting mixture in the form of briquettes with their subsequent vibration compaction and heat treatment of the briquettes to obtain a commercial product.

The obtained samples of briquettes were examined for iron content, i.e. total, using an electromagnetic iron separator, the magnitude of the magnetic field of which was set equivalent to the density and mass of the briquette. Their compressive strength was tested. Moisture content of briquettes, Portland cement content and density were determined.

The results of research and tests and their compliance with the parameters of the briquettes, according to the requirements and conditions of ArcelorMittal Kryvyi Rih OJSC, are given in Table 2.

Table 2 shows that in addition to Mo 3, 4 and 5 compositions that meet the applicability parameters in the process of direct steel smelting, Mo 6 and 7 compositions also meet. At the same time, the Mo b composition has the highest total Ee content. (dO 80 95), and the composition of Mo 7 - the highest strength (more than 5

MPa for compression). Compositions of Mo 3, 4 and 5 occupy an intermediate position according to these two indicators.

The use of the proposed useful model will allow: - to obtain briquettes with stable applicability parameters for their use in the process of direct steel smelting; - To increase the volume of disposal of waste from the processing of steelmaking slag dumps and their return to the process of direct steel smelting; - to release useful land areas from the waste of processing of waste steelmaking slags and thereby reduce the harmful impact on the environment.

Claims (1)

UTILITY MODEL FORMULA Coo) Briquette for direct steel smelting, containing the processing waste of waste steelmaking slag of a fine fraction containing (ezagal. not less than 6595, portland cement and water, which is characterized by the fact that it additionally contains waste processing of waste steelmaking slag of the medium fraction containing General At least 65 95 and crushed metal shavings, while the components of the briquette are taken in the following ratio, mass. 9о: waste from the processing of waste steelmaking slags of a fine fraction with a total content of E. Not less than 65 95 64-83 crushed metal shavings 0-30 processing waste of waste steelmaking slags of medium fraction with the content of E total. Not less than 65 95 0-20 portland cement 7.5-8 water the rest.