RU2502812C2 - Metal extrusion-type briquette (breks) - Google Patents

Metal extrusion-type briquette (breks) Download PDF

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Publication number
RU2502812C2
RU2502812C2 RU2012113386/02A RU2012113386A RU2502812C2 RU 2502812 C2 RU2502812 C2 RU 2502812C2 RU 2012113386/02 A RU2012113386/02 A RU 2012113386/02A RU 2012113386 A RU2012113386 A RU 2012113386A RU 2502812 C2 RU2502812 C2 RU 2502812C2
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Russia
Prior art keywords
briquette
metal
charge
breks
mixture
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RU2012113386/02A
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Russian (ru)
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RU2012113386A (en
Inventor
Иван Филиппович Курунов
Айтбер Махачевич Бижанов
Геннадий Алексеевич Фарнасов
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Айтбер Махачевич Бижанов
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Abstract

FIELD: metallurgy.
SUBSTANCE: metal extrusion briquette obtained by means of a rigid vacuum extrusion method, which contains disperse metal waste, mineral binding agent, and if required, fluxing agents, are used as a charge component in metal melting furnaces. Size of particles of charge components for production of a briquette does not exceed 5 mm, and its weight does not exceed 1.0 kg. As fluxing agents, a briquette contains lime and/or burned dolomite.
EFFECT: obtaining agglomerated charge component for melting of steel, cast iron and ferroalloys, which has sizes, electrical conductivity, high strength and required basicity, which are optimum for use together with other charge components.
3 cl

Description

The invention relates to metallurgy, in particular to methods for the disposal of dispersed metal wastes generated during their casting, in metalworking processes or in the production of metallized pellets and briquettes from them, and can be used in the preparation of charge materials for smelting steel, cast iron and ferroalloys in ore-thermal , arc and induction furnaces, in cupola furnaces and in blast furnaces.
A technical solution is known - a briquette for metal smelting, having the correct geometric shape and prepared from finely dispersed iron-containing waste, finely divided carbon-containing material and a binder, which is used as a mechanical mixture of natural materials - loam, clay or feldspar and sodium carbonate [RF Patent No. 2154680, C22B 1/243, 7/00, 2000, BIPM No. 23]. The briquette for smelting metal according to a known technical solution is obtained by pressing a mixture of these materials moistened with an aqueous solution of liquid glass, followed by drying of the resulting briquette. The disadvantage of this known technical solution is that the briquette for metal smelting, obtained by the described technology, does not have sufficient hot strength, which does not allow it to be used as a charge component in shaft or ore-thermal furnaces.
This drawback is eliminated in another well-known technical solution, which is an iron-containing lumpy material prepared from a mixture of small iron-containing waste from metallurgical production, crushed carbon-containing material and alumina cement by making concrete from this mixture and crushing it into pieces necessary for loading into a metallurgical furnace [DE 3727576, MKI C22B 1/243 of 08/19/1987]. A trifle formed during crushing of concrete is used in the sinter mixture. The disadvantage of this technical solution is the multi-stage and low productivity of the process of manufacturing bulk material and a significant yield of the fine fraction, which must be disposed of using another technology.
The disadvantages of this technical solution are eliminated in the briquette for the production of chromium ferroalloys manufactured in a known manner [RF Patent No. 2000345, MKI C22B1 / 243. 06/29/1992 Published on 09/07/1993. Bull. No. 33-36].
This briquette contains natural and technogenic metal-containing materials, carbon-containing materials and fluxing additives, and as a binder it uses a complex inorganic binder consisting of aluminum slag concentrate and liquid glass.
A disadvantage of the known briquette for the production of chromium ferroalloys is the limited scope of its application and use as a binder of liquid glass.
Another well-known technical solution is a briquette for smelting ferroalloys, manufactured on roll presses from a charge, including natural and man-made metal-containing dispersed materials, carbon-containing materials and a binder in the form of an aqueous solution of lignosulfonate and liquid glass. [RF patent No. 2201976, MKI C22B 1/242, 04.17.2001. Published April 10, 2003].
A disadvantage of this known briquette for smelting ferroalloys is also the use of a binder containing undesirable elements (alkali and sulfur) and not providing the hot strength of the briquettes.
An object of the invention is the elimination of these disadvantages of the known technical solutions, the provision of obtaining agglomerated component of the charge for smelting steel, cast iron and ferroalloys in ore-thermal, arc and induction furnaces, cupola furnaces and blast furnaces, which is optimal for use with other components of the charge dimensions, electrical conductivity , high strength and essential basicity.
The solution to this technical problem is achieved by the fact that an extrusion briquette (BREKS) obtained by hard vacuum extrusion, including a mineral binder, dispersed metal waste and, if necessary, fluxing additives is used as a charge component for metal smelting.
The solution to this technical problem is also achieved by the fact that the fineness of the materials included in the charge for the production of BREKS does not exceed 5 mm, and its mass does not exceed 1.0 kg.
The solution to this technical problem is achieved in addition to the fact that as fluxing additives BREX contains lime and / or calcined dolomite.
The technology of agglomeration of dispersed materials by hard vacuum extrusion is known. This technology, in particular, is widely used in the production of bricks from a mixture of clay-based mixtures (A.Ya. Khavkin, RZ Berman. Brick factories of low power. Building materials. 2000, No. 4, p. 18-19). Its essence consists in continuous forcing under pressure through a single rectangular hole in the die with the size of (60-80) × (40-50) mm of a wet clay-based charge. The charge mass in front of the die passes through a vacuum chamber in which air is removed from this mass. As a result, the density of the charge mass, from which, when it passes under pressure through the hole in the die, the beam is continuously formed, increases. Raw bricks are obtained by periodically instantly cutting the beam exiting the die with a multi-wire cutter into equal parts with a length of 160-200 mm. Thus, according to the principle of operation, this technology is continuous and provides the necessary strength of "raw" bricks for their further multi-row stacking on pallets and transportation to reinforcing firing.
Laboratory studies have shown the possibility of using hard vacuum extrusion technology for sintering dispersed metal wastes mixed with mineral binders and, if necessary, with fluxing additives. The research used fines produced during the production of metallized pellets and their briquetting, fines from ferroalloys formed during their crushing, cast iron shavings and sawdust. Fluxing additives were also added to briquetted materials. During operation of the extruder, dense plastic rods continuously exit the die opening. As a result of the growth of the bending moment arising under the influence of the increasing mass of the rods upon reaching their critical mass and length, the rods break off, forming extrusion briquettes (BREXs).
The length of the formed BREXs is determined by the density and ductility of the rods continuously emerging from the holes of the die, i.e. the composition of the charge mixture to obtain BREKS, as well as the shape and cross-sectional area of the holes in the die. By influencing these factors, you can change the size of the BREXs depending on the requirements of the process for which they are intended. The use of hard vacuum extrusion sintering technology in relation to dispersed metal wastes in order to obtain metal BREXs for use as a component of a metal smelting charge in steelmaking, ore-thermal, induction and blast furnaces or in cupola furnaces having a given chemical composition and metallurgical properties, ensuring its effective use together with any other components of the mixture for smelting metals or separately, the applicant is not known.
The invention consists in the following. The technology of rigid vacuum extrusion ensures that rods with an extremely dense (3.5-5.0 g / cm 3 ) and fairly plastic structure are obtained at the exit of the die of the extruder. In the process of laboratory research revealed new, including unexpected, effects of the use of hard vacuum extrusion for agglomeration of a mixture of metal waste, mineral binder and, if necessary, fluxing additives. Thus, the high density and sufficient ductility of the rods formed from the mixture, continuously cantilever emerging from the holes of the die, causes under the action of the bending moment (due to the increasing mass of the rods) the breaking of the rods with the formation of BREXs, the length of which (40-80 mm) excludes their bonding at unloading from the hopper and is determined by the component composition of the briquetted mixture, as well as the shape and size of the holes in the die. These factors allow you to adjust the length and transverse dimensions of the BREXs depending on its purpose and the type of furnace for use in which they are produced. Those. for use as a component of the charge in oxygen converters, electric arc, ore-thermal and induction furnaces, in cupola furnaces or in blast furnaces, it is possible to obtain optimal size BRECs for these units and charge supply paths to them.
Another new effect of laboratory vacuum research, the use of hard vacuum extrusion for sintering dispersed metal waste separately or in a mixture with fluxing additives, is to ensure, due to their dense structure, high conductivity of BREXs, which accelerates their melting in electric furnaces.
Another effect of using rigid vacuum extrusion for sintering dispersed metal wastes separately or in a mixture with fluxing additives, discovered during laboratory tests, is the possibility of loading and unloading BREXs using an electromagnetic washer.
Another effect, the use of rigid vacuum extrusion for sintering dispersed metal waste separately or in a mixture with fluxing additives, discovered during laboratory tests, is the effect of accelerating slag formation and complete assimilation of slag in the metallurgical furnace of fluxing additives that are part of BREKS. In addition, the presence in the BREKS of the main oxides CaO and MgO, which are part of the mineral binder, reduces the consumption of fluxes used in metal smelting. The presence of fluxing additives in the composition of BREXs has the same effect.
The maximum particle size of the components of the BREKS (5 mm) is due to the maximum transverse dimensions of the BREKS (30-40 mm) for metallurgical furnaces and the corresponding hole size of the die. With larger particles of BREX materials, its ductility decreases and the energy consumption for extrusion increases. The maximum weight of the BREKS is determined by its transverse size, which should not exceed 30-40 mm to accelerate the heating of the metal over the entire cross-section of the BREKS by the time it enters the melting zone. Using the necessary fluxing additives as part of BRECs reduces the consumption of fluxes for metal smelting and the removal of lime from the furnace with exhaust gas.
The invention is illustrated by the following examples.
1. BREKS metal was obtained using hard vacuum extrusion technology on a laboratory extruder from a mixture of dispersed wastes of metallized pellets, Portland cement (6%) and lime (1%) on a laboratory extruder with a hole diameter of 35 mm in the die.
The particle size of all materials in the mixture did not exceed 5 mm. The resulting BREKSs were 50-60 mm long, had high magnetic susceptibility and low electrical resistivity (2400 Ohm · mm 2 / m). BREKSs were used together with small steel scrap for metal smelting in a laboratory induction furnace. Melting of BREKSs occurred simultaneously with steel scrap. The mineral binder and lime of BREKS formed liquid slag.
2. BREX metal was obtained on a laboratory extruder from a mixture of dispersed silicomanganese waste, suction dust from silicomanganese production, Portland cement grade 500. The lime content in the mixture was 3%. The particle size of all materials in the mixture did not exceed 5 mm. The obtained BRACKS had a specific electrical resistance of 2900-3000 Ohm · mm 2 / m, ensuring the passage of electric current through them in electric furnaces. BREX was melted in a crucible in a Tamman furnace. The resulting alloy corresponded to the composition of silicomanganese. The mineral binder and lime of BREKS formed liquid slag.
Thus, BREKS metal, obtained in accordance with the invention, has high metallurgical properties, allowing it to be successfully used in metallurgical furnaces.

Claims (3)

1. The use of extruded metal briquette obtained by hard vacuum extrusion containing dispersed metal waste, a mineral binder and, if necessary, fluxing additives as a component of the charge in metal smelting furnaces.
2. The use according to claim 1, characterized in that the particle size of the components of the mixture for the production of briquettes does not exceed 5 mm, and its mass does not exceed 1.0 kg
3. The use according to claim 1, characterized in that, as fluxing additives, the briquette contains lime and / or calcined dolomite.
RU2012113386/02A 2012-04-09 2012-04-09 Metal extrusion-type briquette (breks) RU2502812C2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2579706C1 (en) * 2014-11-17 2016-04-10 Айтбер Махачевич Бижанов Extrusion-type briquette (breks)-component of charge of shaft furnaces direct production of iron
RU2584836C1 (en) * 2015-07-29 2016-05-20 Александр Николаевич Шаруда Method of producing extrusion briquette
RU2609884C1 (en) * 2016-02-18 2017-02-06 Александр Николаевич Шаруда Extrusion briquette for steel production
RU2653746C1 (en) * 2016-12-28 2018-05-14 Александр Николаевич Шаруда Composition for manufacture of formed products from waste of metallurgical manufactures, a method for obtaining a composition and a method for manufacture of formed products

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SU757601A1 (en) * 1978-06-05 1980-08-23 Kalininsk Polt Inst Method of briquet production from finely grinded mineral raw material
SU1134295A1 (en) * 1983-04-21 1985-01-15 Витебский технологический институт легкой промышленности Device for extrusion moulding of articles from powders
RU2015851C1 (en) * 1990-05-14 1994-07-15 Ереванский политехнический институт Method of preparing of powder alloy on copper-base
WO1996010477A1 (en) * 1994-10-04 1996-04-11 E. Khashoggi Industries Placing filaments within extruded hydraulically settable compositions
CN2344145Y (en) * 1998-08-18 1999-10-20 新汶矿业集团有限责任公司机械厂 Vacuum stiff brick extruding machine
RU2241771C1 (en) * 2003-07-03 2004-12-10 Открытое акционерное общество "Новолипецкий металлургический комбинат" Briquette for cast iron smelting
CN101851086A (en) * 2010-03-26 2010-10-06 王爱瑞 Method for producing sludge self-insulation brick

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* Cited by examiner, † Cited by third party
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SU757601A1 (en) * 1978-06-05 1980-08-23 Kalininsk Polt Inst Method of briquet production from finely grinded mineral raw material
SU1134295A1 (en) * 1983-04-21 1985-01-15 Витебский технологический институт легкой промышленности Device for extrusion moulding of articles from powders
RU2015851C1 (en) * 1990-05-14 1994-07-15 Ереванский политехнический институт Method of preparing of powder alloy on copper-base
WO1996010477A1 (en) * 1994-10-04 1996-04-11 E. Khashoggi Industries Placing filaments within extruded hydraulically settable compositions
CN2344145Y (en) * 1998-08-18 1999-10-20 新汶矿业集团有限责任公司机械厂 Vacuum stiff brick extruding machine
RU2241771C1 (en) * 2003-07-03 2004-12-10 Открытое акционерное общество "Новолипецкий металлургический комбинат" Briquette for cast iron smelting
CN101851086A (en) * 2010-03-26 2010-10-06 王爱瑞 Method for producing sludge self-insulation brick

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2579706C1 (en) * 2014-11-17 2016-04-10 Айтбер Махачевич Бижанов Extrusion-type briquette (breks)-component of charge of shaft furnaces direct production of iron
RU2584836C1 (en) * 2015-07-29 2016-05-20 Александр Николаевич Шаруда Method of producing extrusion briquette
RU2609884C1 (en) * 2016-02-18 2017-02-06 Александр Николаевич Шаруда Extrusion briquette for steel production
RU2653746C1 (en) * 2016-12-28 2018-05-14 Александр Николаевич Шаруда Composition for manufacture of formed products from waste of metallurgical manufactures, a method for obtaining a composition and a method for manufacture of formed products

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