RU2506327C2 - Extrusion-type slurry briquette (breks) - Google Patents

Extrusion-type slurry briquette (breks) Download PDF

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RU2506327C2
RU2506327C2 RU2012113389/02A RU2012113389A RU2506327C2 RU 2506327 C2 RU2506327 C2 RU 2506327C2 RU 2012113389/02 A RU2012113389/02 A RU 2012113389/02A RU 2012113389 A RU2012113389 A RU 2012113389A RU 2506327 C2 RU2506327 C2 RU 2506327C2
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iron
carbon
briquette
materials
breks
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RU2012113389/02A
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Russian (ru)
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RU2012113389A (en
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Владимир Николаевич Скороходов
Иван Филиппович Курунов
Дмитрий Николаевич Тихонов
Ричард Бинион Стил
Айтбер Махачевич Бижанов
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Открытое акционерное общество "Новолипецкий металлургический комбинат"
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Abstract

FIELD: metallurgy.
SUBSTANCE: invention refers to ferrous metallurgy, and namely to agglomeration of iron-ore raw material. An extrusion-type slurry briquette obtained by means of a stiff vacuum extrusion method and containing a mineral binding agent, an iron- and/or iron-and-carbon containing wastes, including slurries, and if required, an iron-ore concentrate and/or iron ore, fluxing additives and carbon-containing materials, is used as a blast-furnace charge component. Ratio of weight contents of carbon and oxygen of iron oxides in a briquette does not exceed 0.76, fineness of materials contained in the charge for obtaining a briquette does not exceed 5 mm, and its weight does not exceed 0.5 kg.
EFFECT: invention ensures utilisation of metallurgical slurries and other metallurgical wastes by their briquetting so that high metallurgical properties of a slurry briquette are provided.
4 cl, 5 ex

Description

The invention relates to ferrous metallurgy, in particular to methods for sintering iron ore raw materials, and can be used in the preparation of charge materials for blast furnace smelting.
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, С22В 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 water 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 component of the charge in blast furnaces. This is also hindered by the presence of alkali metals in the briquette (liquid glass), which contribute to the dust formation in shaft furnaces.
This drawback is eliminated in another well-known technical solution, which is iron-containing lumpy material prepared from a mixture of small iron-containing wastes of 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 blast furnace, coarseness [DE 3727576, MKI C22B 1/243 of 08/19/1987]. A trifle formed during crushing of concrete is used in the sinter mixture. The latter is a disadvantage of this known technical solution, as it complicates the technological scheme and lowers the iron content in the sinter.
This drawback is eliminated in the well-known technical solution - a briquette for smelting cast iron, obtained by vibrocompression from a moistened charge, including carbon-containing materials, man-made iron-containing materials, fluxing additives and a mineral binder and plasticizer, in which the ratio of carbon to iron is in the range 0.25- 0.55, basicity is in the range of 0.3 ... 1.6, the size of the materials included in the charge does not exceed 10 mm, the mass of the briquette is 1.5-8 kg, and the ratio of maximum and minimum the size of the briquette does not exceed 1.2 [RF Patent No. 221771, MKI C22B 1/243, C21B 5/00 from 2003.07.03. Published 2004.12.10].
The disadvantage of this known technical solution is that the carbon content in the briquette regulated by it is redundant with respect to stoichiometric for the direct reduction reactions of iron in the briquette. This leads to the accumulation of fine carbon-containing material in the furnace, worsens its drainage ability and increases the viscosity of slag. The briquette in the known technical solution does not provide for the use of natural iron-containing materials in its composition, which worsens the conditions for the formation of an iron-calcium silicate (olivine) matrix, which ensures the strength of the briquette when it is heated above 800-900 ° C. In addition, the dimensions of the briquettes in the known technical solution significantly exceed the optimal sizes of the pieces of charge materials of blast furnace smelting, and the vibrocompression technology, by which the briquette is produced in this technical solution, has limited performance, requires high cement consumption and heat consumption for curing the briquettes.
An object of the invention is to eliminate these drawbacks of known technical solutions - analogues, the disposal of metallurgical sludge and other metallurgical waste by briquetting to ensure high metallurgical properties of the slurry briquette.
The solution to this technical problem is achieved by the fact that, as a component of a blast furnace charge, an extrusion briquette (BREX) is used, which is obtained by hard vacuum extrusion, including mineral binder, iron and / or iron-carbon waste and, if necessary, iron ore concentrate and / or iron ore , fluxing additives and carbon-containing materials.
The solution to this technical problem is also achieved by the fact that the ratio of the mass contents of carbon and oxygen of iron oxides in the BREKS slurry does not exceed 0.76, the size of the materials included in the charge for the production of BREKS does not exceed 5 mm, its mass does not exceed 0.5 kg.
Additionally, the solution of this technical problem is achieved by the fact that, as a fluxing agent, BREKS slurry contains natural and / or technogenic silica and / or silica-silica materials and, if necessary, lime and / or lime-containing waste.
Additionally, the solution of this technical problem is achieved by the fact that, as carbon-containing materials, BREKS slurry contains coke breeze, and / or coal, and / or anthracite, and / or lignite semi-coke, and / or battle of graphite or carbon electrodes, and / or battle of electrolysis baths for the production of aluminum, and / or charcoal, and / or sawdust, and / or shredded plastic waste, and / or other carbon-containing waste.
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 is to prepare a wet mixture based on clay, continuously supplying the mixture to the extruder, removing air from the mixture by vacuum and forcing the mixture under pressure through a single rectangular hole in the extruder die with a section of (40-50) × (60-80) mm, which continuously comes out a dense plastic bar. 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 strength of “raw” bricks necessary for their multilayer stacking on pallets and transportation in the furnace for hardening firing. This fundamentally distinguishes the technology of rigid vacuum extrusion from the discrete briquetting technology by vibropressing.
Laboratory studies have shown the possibility of using vacuum vacuum extrusion pressing technology to agglomerate a mixture of mineral binders of iron and / or iron-carbon waste and, if necessary, iron ore concentrate and / or iron ore, fluxing additives and carbon-containing materials.
When an extruder is used with a die with many round, oval, or other holes at the exit from it, dense plastic rods can be obtained whose length is determined by their density and ductility and the shape and size of the holes of the die. As a result of the growth of the bending moment arising under the influence of the increasing weight of the rods as their length increases upon leaving the die, the rods break off.
The use of hard vacuum extrusion sintering technology in relation to a mixture of mineral binders, iron and / or iron-carbon waste and, if necessary, iron ore concentrate and / or iron ore, fluxing additives and carbon-containing materials in order to obtain slurry briquettes for extrusion (BREKS) for use in as a component of a blast furnace charge having predetermined dimensions, chemical composition and metallurgical properties, ensuring its effective use together with any and other well-known components of the blast charge or separately, the applicant is not known.
The invention consists in the following. The application of the rigid vacuum extrusion method and technology for agglomeration of a mixture of mineral binder, iron and / or iron-carbon waste and, if necessary, iron ore concentrate and / or iron ore, fluxing additives and carbon-containing materials provides rods with an extremely dense (1.8-2.0 g / cm 3 ) and a strong structure, the length of which (120-180 mm) allows them to be used as a component of a blast furnace charge.
In the process of laboratory and semi-industrial research, new, including unexpected, effects of the use of hard vacuum extrusion for agglomerating a mixture of mineral binders, iron and / or iron-carbon waste and, if necessary, iron ore concentrate and / or iron ore, fluxing additives and carbon-containing materials were revealed.
Thus, the high ductility of the rods continuously emerging from the openings of the die determines, under the action of a bending moment (due to the high density and increasing mass of the rods), the formation of two or three transverse microcracks in the upper layer of their bodies, and then the breaking of the rod. During transportation and overloading of rods, microcracks in the core of the rods increase and their division occurs with the formation of 2-4 BREXs, which have dimensions (25-30) × (40-60) mm, ideal for a component of a blast furnace charge, as from the point of view of ensuring gas permeability of the charge column in the furnace, and from the point of view of ensuring the completeness of their recovery to the approach to the melting zone.
Another new effect of hard vacuum extrusion discovered during laboratory research to agglomerate a mixture of mineral binders, iron and / or iron-carbon waste and, if necessary, iron ore concentrate and / or iron ore, fluxing additives and carbon-containing materials is the formation of iron-calcium silicate (olivine) matrix hardening the body of BREKS when it is heated in a reducing atmosphere to a temperature of 800-1000 ° C. The close contact of cement particles and / or fluxing additives with particles of iron-containing waste and iron ore concentrate in the dense structure of BREXA favors the occurrence of solid-phase reactions of formation of iron-calcium silicates, which as a result form a matrix that provides strength BREXA after reducing the strength of the cement stone when heated above 800-900 ° C . Due to the small transverse size of the BREXA, these reactions occur in its entire volume, which is also facilitated by the microporosity of the BREXA, which ensures the penetration of the reducing gas into the inner layers of the BREXA and the reduction of Fe 2 O 3 to FeO, which takes part in the solid-phase reactions of the formation of iron-calcium silicates. In addition, a layer of metallic iron already appears on the surface of the BREXA, forming a surface framework that also strengthens the body of the BREXA. As a result, in a blast furnace, BREKS retains its shape until it enters the temperature zone of 1100-1250 ° C, where it softens and melts. Before coming into this zone, the reduced iron in BREX is partially carburized to form iron carbide due to the carbon and carbon contained in it, which is formed in the Bell reaction (2CO⇒CO 2 + C). In laboratory conditions, when heated in a hydrogen atmosphere, the BREX maintained its shape without deformation when it was heated to 1200 ° C.
Thus, the use of hard vacuum extrusion briquetting technology with respect to iron-containing waste provides new effects, namely, obtaining slurry BREX optimal for blast furnace smelting and obtaining BREX with high hot strength, which remains intact until it arrives in the melting zone. These effects are the result of obtaining a dense and plastic structure of rods emerging from the holes of the die, of a given transverse size and shape and a given length.
The presence of iron ore concentrate and or iron ore in the composition of BREX increases the iron content in it. The presence of carbon-containing materials reduces the consumption of coke in blast furnace smelting. When BREKS are found in a blast furnace, the carbon of carbon-containing material in their composition is involved in the direct reduction of iron and in the Boudoir reaction (C + CO 2 = 2CO) instead of coke carbon, which increases the reducibility of BREKS and reduces the coke consumption for pig iron smelting. The presence of fluxing additives of various nature in the composition of BREKS provides its basicity required to obtain a given slag basicity, taking into account the basicity of other components of the blast furnace charge.
The ratio of the mass contents of carbon and oxygen of iron oxides in BREKS not higher than 0.76 ensures the full use of carbon BREKS in reactions of direct reduction of iron at any degree of oxidation and in the reduction of zinc with carbon before the arrival of BREKS in the melting zone. When this value is exceeded, the carbon in the BREXs will remain and pass into the slag, increasing its viscosity. The use of materials with a particle size of not more than 5 mm for the production of BREKS is due to the transverse dimensions of the BREKSs (25-35 mm) optimal for the blast furnace charge and the corresponding size of the die openings. With larger particles of the mixture materials to obtain BREXs, their ductility at the exit from the die decreases and the energy consumption for extrusion increases. The maximum weight of the BREKS is determined by its transverse size, which should not exceed 25-35 mm to ensure the completeness of iron reduction over the entire cross-section of the BREKS by the time it enters the melting zone. The use of a wide range of materials as carbon-containing components makes it possible to minimize the cost of BREXs and reduce the cost of cast iron smelted using them. The use of silica and / or iron-silica-containing materials and lime and / or lime-containing waste as a part of fluxing additives, if necessary, allows you to adjust the basicity of the fluxes depending on the composition of the blast furnace charge and the basicity of its components, providing a given basic slag when working on zinc-containing charge. In addition, the presence of silica- and iron-silica-containing materials in the composition of BREKS contributes to an increase in its hot strength due to the formation of iron-calcium silicates in the solid phase when the BREKS is heated in a blast furnace.
The use of mineral cement as a binder provides the strength of BREXA both in the cold state and when it is in a blast furnace when it is heated to 800-900 ° C. The presence of bentonite in the briquetted mixture increases its plasticity during extrusion and the strength of BREXA in the first hours after extrusion.
The invention is illustrated by the following examples.
1. Slurry BREX was obtained by hard vacuum extrusion technology on a laboratory extruder from a mixture of converter sludge (45%), blast furnace sludge (31.0%), iron ore concentrate (5%), scale (12%), Portland cement grade 500 (6% ), bentonite (0.5%), gas treatment dust from a furnace for smelting ferrosilicon (0.5%). The mass ratio of carbon and oxygen content of iron oxides in BREKS was 0.56. The crushing strength of the Brex after crushing for 48 hours was 5.5 MPa. After heating BREKS to a temperature of 1200 ° C at a rate of 500 ° C per hour in an atmosphere of 50% hydrogen and 50% nitrogen, their metallization degree was 74%. Carbon in BREKS after heat treatment was not detected.
2. Slurry BREX was obtained by hard vacuum extrusion technology on a laboratory extruder from a mixture of converter sludge (40%), blast furnace sludge (30.0%), scale (15%), Portland cement grade 500 (6%), bentonite (0.5 %), tailings of magnetite quartzite enrichment (1.5%), gas treatment dust from a lime kiln (0.5%), coke breeze (2.5%) and anthracite (4%). The mass ratio of carbon and oxygen oxides of iron in BREKS was 0.62. The crush strength of the Brex after crushing for 48 hours was 5.3 MPa. After heating the BREKSs to a temperature of 1200 ° C in an atmosphere of 50% hydrogen and 50% nitrogen at a rate of 500 ° C per hour, their metallization degree was 78%. Carbon in BREKS after heat treatment was not detected.
3. Sludge BREX was obtained by hard vacuum extrusion technology on a laboratory extruder from a mixture of converter sludge (36%), blast furnace sludge (35.0%), scale (6.0%), iron ore concentrate (10) Portland cement grade 500 (6% ), bentonite (0.5%), gas cleaning dust from a furnace for smelting ferrosilicon (0.5%), coal (2.5%) and the battle of graphite electrodes and electrolysis baths (4%). The mass ratio of carbon and oxygen content of iron oxides in BREKS was 0.68. The crushing strength of the Brex after crushing for 48 hours was 4.9 MPa. After heating BREKSs to a temperature of 1200 ° C in an atmosphere of 50% hydrogen and 50% nitrogen at a rate of 500 ° C per hour, their metallization degree was 83%. Carbon in BREKS after heat treatment was not detected.
4. Slurry BREX was obtained by hard vacuum extrusion technology on a laboratory extruder from a mixture of converter sludge (30%), blast furnace sludge (32.0%), scale (25%), Portland cement grade 500 (6%), bentonite (1.0 %), gas cleaning dust from the furnace for smelting ferrosilicon (1.5%), lime (0.5%) charcoal (2%) and sawdust (2%). The mass ratio of carbon and oxygen content of iron oxides in BREKS was 0.51. The crushing strength of the Brex after crushing for 48 hours was 4.9 MPa. After heating the BREKSs to a temperature of 1200 ° C in an atmosphere of 50% hydrogen and 50% nitrogen at a rate of 500 ° C per hour, their metallization degree was 68%. Carbon in BREKS after heat treatment was not detected.
5. Sludge BREX was obtained by hard vacuum extrusion technology on a laboratory extruder from a mixture of converter sludge (40%), blast furnace sludge (30.0%), scale (10%), iron ore (5%) Portland cement grade 500 (6%) , bentonite (0.5%), gas cleaning dust from a furnace for smelting ferrosilicon (1.5%), lime (0.5%),), coke breeze (4.5%) and plastic waste (2%). The mass ratio of carbon and oxygen content of iron oxides in BREKS was 0.61. The crushing strength of the Brex after crushing for 48 hours was 5.2 MPa. After heating the BREKSs to a temperature of 1200 ° C in an atmosphere of 50% hydrogen and 50% nitrogen at a rate of 500 ° C per hour, their metallization degree was 76%. Carbon in BREKS after heat treatment was not detected.
Computer simulation of blast furnace smelting on a charge including slurry brexes of composition No. 1 (55%) and Lebedinsky pellets (45%) showed a decrease in coke consumption by 17% compared to blast furnace smelting on a mixture of sinter (70%) and pellets (30%) )
Thus, the slurry BREXs obtained in accordance with the invention have high metallurgical properties that can be successfully used in blast furnace with coke saving.

Claims (4)

1. The use of extruded slurry briquette obtained by hard vacuum extrusion containing a mineral binder, iron and / or iron-carbon waste, including sludge, and, if necessary, iron ore concentrate and / or iron ore, fluxing additives and carbon-containing materials, as a component of a blast furnace charge.
2. The use according to claim 1, characterized in that the ratio of the mass contents of carbon and oxygen of iron oxides in the briquette does not exceed 0.76, the fineness of the materials included in the mixture to obtain the briquette does not exceed 5 mm, and its mass does not exceed 0, 5 kg
3. The use according to claim 1, characterized in that, as fluxing additives, the briquette contains natural and / or technogenic silica and / or iron-silica-containing materials and, if necessary, lime and / or lime-containing waste.
4. The use according to claim 1, characterized in that, as the carbon-containing materials, the briquette contains coke breeze, and / or coal, and / or anthracite, and / or lignite semi-coke, and / or the battle of graphite or carbon electrodes, and / or the battle of electrolysis baths for the production of aluminum, and / or charcoal, and / or wood chips, and / or shredded plastic waste, and / or other carbon-containing waste.
RU2012113389/02A 2012-04-09 2012-04-09 Extrusion-type slurry briquette (breks) RU2506327C2 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Non-Patent Citations (2)

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