RU2499061C1 - Flushing extrusion-type briquette (feb) - Google Patents

Flushing extrusion-type briquette (feb) Download PDF

Info

Publication number
RU2499061C1
RU2499061C1 RU2012113391/02A RU2012113391A RU2499061C1 RU 2499061 C1 RU2499061 C1 RU 2499061C1 RU 2012113391/02 A RU2012113391/02 A RU 2012113391/02A RU 2012113391 A RU2012113391 A RU 2012113391A RU 2499061 C1 RU2499061 C1 RU 2499061C1
Authority
RU
Russia
Prior art keywords
iron
materials
extrusion
exceed
feb
Prior art date
Application number
RU2012113391/02A
Other languages
Russian (ru)
Other versions
RU2012113391A (en
Inventor
Иван Филиппович Курунов
Дмитрий Николаевич Тихонов
Айтбер Махачевич Бижанов
Original Assignee
Открытое акционерное общество "Новолипецкий металлургический комбинат"
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Открытое акционерное общество "Новолипецкий металлургический комбинат" filed Critical Открытое акционерное общество "Новолипецкий металлургический комбинат"
Priority to RU2012113391/02A priority Critical patent/RU2499061C1/en
Publication of RU2012113391A publication Critical patent/RU2012113391A/en
Application granted granted Critical
Publication of RU2499061C1 publication Critical patent/RU2499061C1/en

Links

Abstract

FIELD: metallurgy.
SUBSTANCE: extrusion-type briquettes (FEB) produced using a method of stiff vacuum extrusion from the mixture of a mineral binding agent, technogenic and/or natural iron-containing and/or iron-and-manganese-containing materials and fluxing additives at atomic relation of oxygen of iron oxides to iron in FEB of 1.0-1.35 and the relation of oxides of calcium and silicon (CaO/SiO2), which does not exceed 1.0, are used as a flushing component for blast-furnace charge. Size of particles of the materials includes in FEB composition does not exceed 5 mm, and its weight does not exceed 0.5 kg. As technogenic iron-containing material of FEB, which is used as a flushing component of blast-furnace charge, contains scale; as fluxing additives, it contains tails of benefication of ferruginous magnetite quartzites and/or dust of gas cleaning of ferrosilicon or silicomanganese production, and/or slag of ferrosilicon or silicomanganese production, and if necessary, natural or technogenic materials containing CaF2.
EFFECT: obtaining a flushing component with an extremely dense and ductile structure, which has high flushing properties.
3 cl, 1 ex

Description

The invention relates to ferrous metallurgy, in particular to methods for sintering iron ore, and can be used in the preparation of charge materials for washing the furnaces of blast furnaces.
A technical solution is known - a briquette for metal smelting, having the correct geometric shape and prepared from finely divided 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 flushing properties due to the presence of carbon-containing materials in it. In addition, the strength of the briquette when heated decreases, 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, which contribute to the scaling in shaft furnaces.
Part of these drawbacks is eliminated in another well-known technical solution, which is 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 of the size required for loading into a blast furnace [ DE 3727576, MKI C22B 1/243 of 08.19.1987]. A trifle formed during crushing of concrete is used in the sinter mixture. However, this charge material is not suitable for washing the hearth of a blast furnace due to the presence of carbon-containing materials in it.
Another well-known technical solution is a briquette for washing the hearth of blast furnaces, obtained by pressing in rolls, including iron, manganese, carbon-containing materials and fluxing additives with mass ratios of elements and oxides in the briquette: C / Fe, Mn / Fe, CaO / SiO 2 , MgO / Al 2 O 3, respectively, in the range of 0.05 ... 0.15, 0.03 ... 0.2, 0.6 ... 1.2, 0.2 ... 0.6 (RF Patent No. 221759, MKI C21B 3 / 00. From 2003.12.03).
The disadvantages of this known technical solution is the use of an organic binder that does not provide the strength of the briquette when heated, the presence of carbon-containing materials in the briquette and a high upper limit to the basicity of the briquette.
An object of the invention is to remedy these disadvantages of known technical solutions - analogues, providing high strength and flushing properties of the washing component of the blast furnace charge.
The solution to this technical problem is achieved by the fact that as a washing component of a blast furnace charge, an extrusion briquette (BREKS) is used, obtained by the method of hard vacuum extrusion, including mineral binder, industrial and / or natural iron-containing and / or ferromanganese-containing materials and fluxing additives.
The solution to this technical problem is also achieved by the fact that the atomic ratio of oxygen of iron oxides to iron in BREKS used as a washing component of the blast furnace charge is 1.0-1.35, the ratio of calcium and silicon oxides (CaO / SiO 2 ) does not exceed 1 , 0, the particle size of the materials included in the BREX does not exceed 5 mm, and its mass does not exceed 0.5 kg.
The solution to this technical problem is also achieved by the fact that BREKS, used as a washing component of a blast furnace charge, includes scale as an anthropogenic iron-containing material, and includes fluxing tailings for ferrous magnetite quartzite and / or gas cleaning dust from ferrosilicon or silicomanganese, and / or slag produced by ferrosilicon or silicomanganese, and, if necessary, containing CaF 2 natural or man-made materials.
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 rectangular single 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 laying 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 hard extrusion pressing technology for sintering natural and / or man-made iron and / or manganese-containing materials using various types of mineral binders, including cement, and fluxing agents. 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 exiting the die, the rods break off.
Application of hard vacuum extrusion sintering technology in relation to technogenic and / or natural iron-containing and / or ferromanganese-containing materials in order to obtain extrusion briquettes (BRECs) for use as a washing component of a blast furnace charge having specified dimensions, chemical composition and metallurgical properties, providing its effective use for washing the hearth of blast furnaces, the applicant is not known.
The invention consists in the following. The application of the method and technology of rigid vacuum extrusion for agglomeration of a mixture of mineral binders, industrial and / or natural iron and / or ferromanganese-containing materials and fluxing additives in order to obtain a washing component of a blast furnace charge provides rods with an extremely dense (2.1-2.3 g / cm 3 ) and a plastic structure, the length of which (100-150 mm) allows them to be used as a component of a blast furnace charge, cases of fire when unloading them from the hopper are unlikely.
In the process of laboratory and semi-industrial studies, new, including unexpected, effects of the use of hard vacuum extrusion for agglomerating a mixture of technogenic and / or natural iron-containing and / or ferromanganese-containing materials and fluxing additives 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 increasing mass of the rods), the formation of one or two 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 fracture with the formation of 2-3 BREXs, which are ideal for the washing component of a blast furnace charge (25-30) × (40-50) mm in terms of ensuring the completeness of solid-state reactions the formation in BREKS of fusible, hardly recoverable ferromanganese silicates up to the approach to the temperature zone of 1100-1200 ° C, where these silicates form an easily movable ferromanganese slag with high flushing properties.
Another new effect of hard vacuum extrusion discovered during laboratory studies for sintering technogenic and / or natural iron and / or iron-manganese-containing materials and fluxing additives is the formation of an iron-silicate or ferromanganese-silicate matrix, which strengthens the BREX body when it is heated in a reducing atmosphere to a temperature of 800-1000 ° C. The close contact of the particles of acid fluxing additives with particles of technogenic and / or natural iron and / or ferromanganese-containing materials in the dense structure of BREX favors the occurrence of solid-phase reactions of formation of ferruginous and ferromanganese silicates, which as a result form a matrix that provides briquette strength when the strength of cement stone is reduced when heated above 800-900 ° C. Due to the small transverse size of the BREX, these reactions proceed in its entire volume, which is also facilitated by the microporosity of the BREX, which ensures the penetration of the reducing gas into the inner layers of the BREX and the reduction of Fe 2 O 3 to FeO, which takes part in the solid-state reactions of the formation of ferrous silicates. In addition, a layer of metallic iron already appears on the surface of the BREX, forming a surface framework that also strengthens the body of the BREX. As a result, in a blast furnace, BREKS retains its shape until it enters the temperature zone 1100-1250 ° C, where it softens and melts. In laboratory conditions, the BREX retained its shape without deformation when it was heated in a hydrogen atmosphere to 1200 ° C.
The washing properties of charge materials are determined by the presence of ferrous and silicon oxides in them in the form of iron-calcium olivines or fayalit (EF Wegman. Oskusovanie ore and concentrates. M. 1976, p. 86-89). Maintaining the atomic ratio of oxygen of iron oxides to iron in the BREKS in the range of 1.0-1.35 ensures that when the BREKS is loaded into the blast furnace, the presence of iron monoxide in its structure, which is then involved in the solid-phase reactions of the formation of ferrous silicates. This accelerates the formation of a hardening and hardly recoverable silicate matrix. The ratio of CaO / SiO 2 in BREKS not more than 1.0 also contributes to the formation in the BREKS when it is heated to 900-1100 ° C of refractory ferromanganese silicates, forming primary slag after their melting and effective washing of the coke packing in the furnace. The same effect is achieved due to the use, in the composition of BREX, of tailings for the enrichment of ferruginous magnetite quartz and / or dust from the gas treatment of ferrosilicon or silicomanganese production, and / or slag from the production of ferrosilicon or silicomanganese. The use of natural or technogenic materials as fluxing additives containing CaF 2 increases the fluidity and washing properties of the slags formed in the blast furnace when using the washing component of the blast furnace charge. The maximum particle size of the components of the BREKS components of 5 mm is due to the transverse size 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 30-35 mm to ensure the completeness of the solid-phase reactions of the formation of fusible ferromanganese silicates throughout the entire cross-section of the BREKS by the time it enters the melting zone.
The invention is illustrated by the following example. BREKS flushing was obtained using hard vacuum extrusion technology on a laboratory extruder from a mixture of mill scale (70%), iron ore concentrate (7%), blast furnace sludge (5%), tailings for the enrichment of magnetite quartzite (5%), manganese ore (5%), dust gas purification production of ferrosilicon (3%) and Portland cement grade 500 (5%), the humidity of the mixture was 14% at a pressure on the mixture in the extruder of 1.85 MPa. The size of the mixture materials did not exceed 3 mm. The atomic ratio of oxygen of iron oxides to iron in BREKS was 1.19, and the ratio of CaO / SiO 2 was 0.85. The crushing strength of the Brex after crushing for 48 hours was 5.5 MPa. When the BREKS were heated to a temperature of 1100 ° C in an atmosphere of 50% hydrogen and 50% nitrogen at a rate of 500 ° C per hour, the softening and fusion of the BREKS began at 1170 ° C.
Thus, in washing BREXs manufactured in accordance with the invention, when heated to 900-1100 ° C, in the reactions in the solid phase, low-melting refractory carbon monoxide and hydrogen ferromanganese silicates are formed having high washing properties, which can be successfully used in blast furnaces to release coke nozzle from coke breeze, reducing its permeability and drainage ability.

Claims (3)

1. The use of extrusion briquette obtained by rigid vacuum extrusion containing a mineral binder, industrial and / or natural iron and / or iron-manganese-containing materials and fluxing additives with an atomic ratio of oxygen of iron oxides to iron of 1.0-1.35, as a washing component of a blast furnace charge.
2. The use according to claim 1, characterized in that the ratio of calcium and silicon oxides (CaO / SiO 2 ) in the extrusion briquette does not exceed 1.0, the particle size of the materials contained in it 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 the technogenic iron-containing material, the extrusion briquette contains scale, and as fluxing additives it includes tailings for the ferrous magnetite quartzite and / or gas cleaning dust from the production of ferrosilicon or silicomanganese, and / or slag from the production of ferrosilicon or silicomanganese and, if necessary, containing CaF 2 natural or man-made materials.
RU2012113391/02A 2012-04-09 2012-04-09 Flushing extrusion-type briquette (feb) RU2499061C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2012113391/02A RU2499061C1 (en) 2012-04-09 2012-04-09 Flushing extrusion-type briquette (feb)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2012113391/02A RU2499061C1 (en) 2012-04-09 2012-04-09 Flushing extrusion-type briquette (feb)

Publications (2)

Publication Number Publication Date
RU2012113391A RU2012113391A (en) 2013-10-20
RU2499061C1 true RU2499061C1 (en) 2013-11-20

Family

ID=49356708

Family Applications (1)

Application Number Title Priority Date Filing Date
RU2012113391/02A RU2499061C1 (en) 2012-04-09 2012-04-09 Flushing extrusion-type briquette (feb)

Country Status (1)

Country Link
RU (1) RU2499061C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2609888C1 (en) * 2015-12-29 2017-02-06 Александр Николаевич Шаруда Flushing extrusion briquette for blast-furnace process

Citations (6)

* 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
RU2000345C1 (en) * 1992-06-29 1993-09-07 Геннадий Алексеевич Лазарев Method for manufacture of bricks for producing chromium ferroalloys
RU2015851C1 (en) * 1990-05-14 1994-07-15 Ереванский политехнический институт Method of preparing of powder alloy on copper-base
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
CN101851086A (en) * 2010-03-26 2010-10-06 王爱瑞 Method for producing sludge self-insulation brick

Patent Citations (6)

* 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
RU2000345C1 (en) * 1992-06-29 1993-09-07 Геннадий Алексеевич Лазарев Method for manufacture of bricks for producing chromium ferroalloys
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
CN101851086A (en) * 2010-03-26 2010-10-06 王爱瑞 Method for producing sludge self-insulation brick

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ХАВКИН А.Я., БЕРМАН Р.З. Кирпичные заводы малой мощности с применением технологии жесткой экструзии. Строит. материалы, 2000, №4, с.18-19. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2609888C1 (en) * 2015-12-29 2017-02-06 Александр Николаевич Шаруда Flushing extrusion briquette for blast-furnace process

Also Published As

Publication number Publication date
RU2012113391A (en) 2013-10-20

Similar Documents

Publication Publication Date Title
CN105039728A (en) Method for treating copper slag
KR101903438B1 (en) Non-roasting Pellet Composition Prepared By Using Melted Iron slags and Melted Iron Process By-products, and Pellet Preparation Method
CN107849637B (en) Improved slag from non-ferrous metal production
Mymrin et al. Environment friendly ceramics from hazardous industrial wastes
Chen et al. Preparation of prereduced pellets by pyrite cinder containing nonferrous metals with high temperature chloridizing-reduction roasting technology
RU2241771C1 (en) Briquette for cast iron smelting
RU2502812C2 (en) Metal extrusion-type briquette (breks)
EP3242958A1 (en) Process for dephosphorization of molten metal during a refining process
CN102766717A (en) Method for treating high phosphorus ore by using direct reduction process
Mandal et al. Characterization of fluxed iron ore pellets as compared to feed material for blast furnace
AU2005250105B2 (en) Agglomerated stone for using in shaft furnaces, corex furnaces or blast furnaces, method for producing agglomerated stones, and use of fine and superfine iron ore dust
EP2949765B1 (en) Composite briquette and method for making a steelmaking furnace charge
RU2499061C1 (en) Flushing extrusion-type briquette (feb)
RU2506325C2 (en) Method for producing extrusion-type briquette (breks) for metal melting
RU2506326C2 (en) Extrusion-type briquette (breks) - component of blast-furnace charge
RU2653746C1 (en) 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
RU2506327C2 (en) Extrusion-type slurry briquette (breks)
RU2244026C1 (en) Briquette for metal smelting
KR20060072793A (en) Method for manufacturing something replacing steel scraps using slag of steel-making process
RU2228377C2 (en) Briquette for metallurgical transformation
Kurunov et al. Stiff Vacuum Extrusion for Agglomeration of Natural and Anthropogenic Materials in Metallurgy
RU2549029C1 (en) Briquette for metallurgical treatment
RU2241760C1 (en) Briquette as component of blast-furnace batch
RU2352648C2 (en) Charge for manufacturing of bricks for metallurgical production
CZ2005629A3 (en) Ingredient scrap briquette and process for producing thereof