SU1534079A1 - Steel-melting briquette, and method of producing same - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used for the manufacture of briquettes and their use as a charge for steelmaking. The aim of the invention is to reduce the labor intensity and energy intensity of manufacturing and melting the briquette. Briquette consists of crushed iron-containing scrap, carbon-containing and slag-forming materials. The briquette contains crushed aluminum-containing scrap in the amount of (3.0-5.0 wt.%) And pyrocarbon and / or lignin (7.0-9.5 wt.%) Is used as carbon-containing materials, and slag-forming materials - hydrated lime (5.0-7.0 wt.%). Initially, 25-75% of crushed iron-containing scrap is loaded, distributed over the surface of the matrix. Then, 25-75% of the crushed aluminum-containing scrap is loaded, placing it in the central part of the matrix, 1 / 10-1 / 4 side from the walls or the diameter of the matrix, and pyrocarbon and / or lignin and hydrated lime are loaded into the center of the matrix. which is loaded with the remaining part of the crushed aluminum-containing scrap, placing it in the same way as during the initial loading. Lastly, the remaining ground iron scrap is loaded. This method of manufacture

Description

3153

crushed iron-containing scrap, as well as the thermal conditions of melting the briquette deteriorate, which entails an increase in specific energy consumption. With a content of more than 5.0% by weight, these parameters do not significantly improve, however, the production of a briquette is more expensive.

The pyrocarbon used as a carbon-containing material, which is a product of thermal processing of household or industrial waste, and / or lignin, which is a waste of the microbiological industry, is introduced into the briquette in an amount of J, 0 - 9.5 wt%. When the content of pyrocarbon and / or lignin in the briquette is less than 7.0 wt.%, The carbon content in the briquette decreases, which leads to an increase in the melting point of the briquette and an increase in the specific intensity of melting. When briquette contains pyrocarbon and / or lignin & the amount of more than 9.5 wt.% deterioration of the volume prepressing of the components occurs, which entails a decrease in the adhesion strength of the materials in the briquette. The content of slaked lime in the briquette is 5.0-7.3 May. D. With a lower consumption of lime, the descapping capacity of the stick decreases, while the strength properties of the briquette deteriorate.

The drawing is a schematic diagram implementing a method of manufacturing a briquette in a press matrix With the initial arrangement of the poured components.

The diagram shows the press matrix 1, crushed iron-containing scrap 2, crushed aluminum-containing scrap 3, pyrocarbon and / ip lignin and lime 4, punch 5 of the press, press chamber 6,

A method for making a briquette is as follows.

At the bottom of the matrix 1 press load 25-27% of the crushed iron-containing scrap 2, its distribution evenly over the entire area of the matrix. Then 35-65% of crushed aluminum-containing scrap 3 is loaded from above. It is distributed in the central part of the matrix 1 at a distance from the walls of the matrix 1 equal to 1 / 10-1 / 4 of the side or diameter below. The top is then loaded with PSA amount of pyrocarbon and / or leagues.

0

five

with

0

five

0

five

0

five

Nina and hydrated lime 4, distribute them in the center of the matrix 1. Next, load the remaining amount of crushed aluminum-containing scrap 3, distribute it in the central part of the matrix 1 at a distance from the walls equal to 1 / 10-1 / 4 of the side or diameter of matrix 1. Last the remaining amount of crushed iron-containing scrap 2 is loaded; it is distributed over the entire area of the matrix 1. At the end of the loading, briquetting is performed.

In addition to the function of removing sulfur from the melt, slaked lime performs the function of a binder material, entering into a physicochemical interaction with carbon dioxide in the air during the manufacture and storage of briquettes with the formation of calcium hydrosilicate, which cement the briquette structure, thereby reducing the specific energy consumption for manufacturing briquette. Eliminating the grinding and mixing of components in the manufacture of a briquette reduces the specific energy consumption and laboriousness of making a briquette. Pyrocarbon and / or lignin and slaked lime are hard-to-briquette materials, so they are placed in the matrix in such a way that they are inside the briquette. The crushed aluminum-containing scrap in briquetting performs the function of a binder material between pyrocarbon and / or lignin and slaked lime and crushed iron-containing scrap due to the high ductility of aluminum-based materials.

When loading crushed iron-containing scrap in an amount of less than 25%, a too thin bottom layer of this component is formed, which leads to premature melting of crushed aluminum-containing scrap, its outflow from the briquette and oxidation due to oxygen in the furnace space, and not due to the oxygen of the briquette. When loading crushed apium-containing scrap in an amount of less than 35%, the thin layer formed of this component does not provide sufficient adhesion of the crushed iron-containing scrap to pyrocarbon and / or lignin and slaked lime. At initial loading of crushed aluminum-containing scrap in the amount of

a thinner upper layer of this component also does not provide sufficient adhesion of the rest of the briquette components.

Placing shredded aluminum-containing scrap at a distance of less than 1/10 of the side or diameter of the matrix 1 from the matrix 1 results in a too thin side layer of shredded iron-containing scrap, which causes the crushed aluminum-containing scrap to melt prematurely, flow out of the briquette and oxidize due to oxygen furnace space, and not due to the oxygen briquette.

When placing shredded aluminum-containing scrap at a distance from the walls of matrix 1 is more than 1 / side or the diameter of the matrix, either the top layer of this component is too thin when initially loaded in an amount of 65%, which does not ensure sufficient adhesion of the crushed iron-containing scrap to the pyrocarbon and / or lignin and hydrated lime, or shedding of the top layer of crushed aluminum-containing scrap occurs closer to the wall of the matrix 1 than 1 / side or the diameter of the matrix 1 (when initially loaded in The amount of 35%).

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scrap, carbon-containing and slag-forming materials, characterized in that, in order to reduce labor-intensive and energy-intensive production and melting of the briquette, it additionally contains crushed aluminum-containing scrap, as carbon-containing materials, briquette contains pyrocarbon and / or lignin, and as slag-forming - ing - slaked lime in the following ratio of components, wt.%: Ground aluminum-containing scrap 3.0-5.0 Pyrocarbon and / or

7.0-9.5

Rest

lignin

Slaked lime 5,0-7,0 Crushed iron-containing scrap

2. A method of manufacturing a briquette for smelting steel, including loading components into the matrix of the press 5 and briquetting, characterized in that, in order to reduce the labor intensity and specific energy consumption of manufacturing and melting the briquette, crushed iron-containing scrap is loaded into the press matrix over the entire area dies, then shredded aluminum-containing scrap,

it is distributed in the central part. Using the invention of the matrix, then in the center of the matrix it will significantly (to kG%) reduce the specific energy consumption and the duration of melting of the briquettes when steel is smelted from them. In this case, an increase in the productivity of the steelmaking unit is achieved.

Claims (1)

Invention Formula 1. Steelmaking briquette containing crushed iron containing pyrocarbon and / or lignin and hydrated lime, after which the rest of the crushed aluminum-containing scrap is placed, and then the rest of the crushed 4Q finished iron-containing scrap. 3. The method according to claim 2, characterized in that the crushed aluminum-containing scrap is placed in the central part of the matrix at a distance of 5 from the walls of the matrix, equal to 1 / 10-1A side or diameter. pyrocarbon and / or lignin and hydrated lime are squeezed, after which the rest of the crushed aluminum-containing scrap is placed, and then the rest of the crushed iron-containing scrap. 3. The method according to claim 2, characterized in that the crushed aluminum-containing scrap is placed in the central part of the matrix at a distance of from the walls of the matrix, equal to 1 / 10-1A side or diameter.