Extruded coke briquette (brec)

FIELD: metallurgy.

SUBSTANCE: invention relates to application of BREC produced by stiff vacuum extrusion.Said process comprises coke fines, mineral binder and, if required, brown-coal char to be used as reducer in metallurgical furnace. Mineral binder in production of BREC is normally a cement and, if required, bentonite. Particle size of materials of the mix for BREC production does not exceed 5 mm, BREC weight not exceeding 0.3 kg.

EFFECT: optimum size, higher cold and hot strength.

3 cl, 2 ex

 

The invention relates to the technology of briquetting carbonaceous materials, and can be used in metallurgy for the disposal of coke breeze.

Known technical solution is formed in various ways briquettes from small classes coke having a specific shape, covered with a protective layer domain or steel slag and having a high heat resistance and durability (Patent RF №2374308. C10L 5/32 21.04.2008). The disadvantage of this technical solution is an extremely complex, time-consuming and inefficient technology of manufacturing briquettes, requiring manual labor on the individual pinning briquettes Garabakh in the flask to fill them with liquid slag. In addition, the slag layer on the surface of the briquettes limits their use in metallurgical processes and excludes their use as fuel.

Know another technical solution - briquettes produced from lignite coke used as a reducing agent in metallurgical processes and as a smokeless fuel for domestic and industrial furnaces. Briquettes coke is produced by mixing lignite char and solution of slaked lime, pressing the mixture, drying the resulting briquettes and their impregnation with a solution of liquid glass (Patent RF №2376342, C10L 5/12, from 09.07.2008). It is those who practical solution partially eliminates the above disadvantages, but its disadvantage is the complexity and multi-stage process, as well as the presence of liquid glass in the finished briquettes, which reduces the value of briquettes from lignite char when used in blast furnaces due to the presence of an alkali metal.

Know another technical solution - briquettes from small classes coke generated from their wet mixture with liquid glass and pulverized silica and subjected to subsequent drying (Patent RF №2325433. C10L5/12 dated 29.01.2007). The briquettes on this technical solution suitable proportion of use as a reductant in metallurgical processes, however, the presence of liquid glass or makes them unsuitable for use in blast furnaces.

Known technical solution - briquettes from a mixture of coke breeze and thermoantracite stuff with lignosulfonate and products formed under a pressure of 25 MPa (RF Patent No. 2298028, C10L 5/10, C10L 5/28, dated 16.01.2006). This solution eliminates the disadvantages of the above solutions. The resulting briquettes are heat-resistant and high calorific value, so you can use them as and reductant in metallurgical processes and as fuel in industrial and domestic furnaces. However, the disadvantage of this technical solution is the increased sulphur content in the Brik the Ah for use as a binder of lignosulfonate and petroleum products.

An object of the invention is to eliminate these disadvantages of the known technical solutions and ensuring receipt using the minimum amount of binder briquettes with sufficient strength, high reactivity and optimal sizes for use in metallurgical furnaces, as a reductant.

The solution to this technical problem is achieved by the fact that as a reductant for metallurgical furnaces used briquette extrusion (BREX) coke, obtained by the method of the hard vacuum extrusion, including coke breeze, mineral binder and, if necessary, brown coal char. The solution to this technical problem is achieved by the fact that as a mineral binder use cement and, if necessary, the bentonite.

The solution to this technical problem is achieved by the fact that the particle size of the materials included in the mixture for the production Brex does not exceed 5 mm, weight Brex not exceed 0.3 kg and the total content of mineral binders and bentonite does not exceed 3%.

Widely used the concept of "mineral binder includes cement, bentonite, clay, water glass, lime, gypsum, alabaster and other substances, not of organic origin, with astringent properties, and are not polymers.

Technology Ososkov is of dispersed material by stiff vacuum extrusion method known. This technology, in particular, is widely used in the manufacture of bricks from the charge mixture on the basis of clay (YA Khavkin, R.Z. Berman. Brick plants of small capacity. Building materials. 2000, No. 4, p.18-19). Its essence lies in the preparation of wet charge mixture on the basis of clay, the continuous supply of the mixture in the extruder, removing the air from the mixture by vacuum and burst mixture under pressure through a single rectangular hole in filiere extruder section (40-50)×(60-80) mm, which continuously comes out thick plastic lumber. Raw bricks are produced by periodic instantaneous cutting beam emerging from the die, wire cutter on equal parts of length 160-200 mm Thus, the principle of this technology is continuous and provides the strength of raw bricks required for multi-layer stacking on pallets and transport in the furnace for hardening firing.

Laboratory studies have shown the possibility of applying the technology of pressing the stiff vacuum extrusion method for sintering coke breeze and, if necessary, brown coal char in a mixture of mineral binders and bentonite.

When used in the extruder die with many of the holes are round, oval or other shape on the exit it is possible to obtain a dense square is a partial rods, the length of which is determined by their density and plasticity and shape and size of the Spinneret holes. The increase in bending moment arising under the influence of increasing the weight of the rods with the growth of their length at the die exit, the rods are cut.

The use of technology sintering method hard vacuum extrusion against coke breeze and, if necessary, lignite char, with the aim of obtaining extrusion briquettes (Brex) coke used as a reducing agent in metallurgical furnaces and having a given size and composition, ensuring their effective application, the applicant does not know..

The invention consists in the following. The application of the method and technology of hard vacuum extrusion process for sintering coke breeze and, if necessary, brown coal char in a mixture with mineral binders and bentonite ensures rods with thick (1.5 to 1.6 g/cm3and plastic structure, the length of which (150-200 mm) does not exclude their kostrena when unloading from the hopper.

In the process of laboratory and pilot-scale studies have identified new, including the unexpected, effects of hard vacuum extrusion process for sintering coke breeze and, if necessary, brown coal char in a mixture with mineral binder.

T is to the high plasticity of the rods, continuously coming out of the holes of the die, causes under the action of bending moment (because of the increasing mass of the rods), education in the upper layer of their bodies transverse microcracks, and then breaking the rod. During transportation and loading rods cracks in the body of the rods increases and there is their division with the formation of several Brex with ideal for use as a reductant in metallurgical furnaces, sizes (25-30)×(30-60) mm

Other new found during laboratory studies, the effect of hard vacuum extrusion process for sintering coke breeze and, if necessary, brown coal char is an increased hot strength compared to coke briquettes obtained by other technologies briquetting, and at a lower binder content in the Brex. This is due to the higher density of Brex, compared with density alternative briquettes obtained through the technology hard vacuum extrusion process.

Thus, applying the technology of briquetting method hard vacuum extrusion relative to the coke breeze and, if necessary, the lignite coke mixed with mineral binders, provides the new effects, namely getting Brex optimal RA is a measure for metallurgical furnaces bulk reductant, with increased cold and hot strength compared to coke briquettes produced by other technologies. These effects are a consequence of obtaining a dense and plastic patterns coming out of the holes of the die rods predetermined transverse size and shape and of a given length.

The ultimate particle size of components Brex (5 mm) due to optimal for metallurgical furnaces of the transverse dimensions of the Brex (25-30 mm) and the corresponding size of the Spinneret holes. When larger particles of the material mixture to obtain Brex reduced their plasticity at the die exit and increases the power consumption for extrusion. Weight limits Brex is determined by its cross-sectional dimension, which should not exceed 25-30 mm to ensure the homogeneity of the particle size distribution of the charge of metallurgical furnaces.

The invention is illustrated by the following examples

Example 1. Brex coke received on technology hard vacuum extrusion process on a laboratory extruder from a mixture of coke breeze (94,5%) cement (5%) and bentonite (0.5 percent). Tests obtained brex showed their high tensile splitting strength (180 kgf/cm2), and tested according to standard method ISO on hot strength and reactivity gave values of CSR and CRI 20% and 45.6%, respectively. Polucen the e brex can be used as a reducing agent in smelting and blast furnaces, as well as the carburizing material in electric arc and induction furnaces.

Example 2. Brex coke received on technology hard vacuum extrusion process on a laboratory extruder from a mixture of coke breeze (60%), lignite char (35%) cement (4.5%) and bentonite (0.5 percent). Tests obtained brex showed their high tensile splitting strength (175 kgf/cm2), and tested according to standard method ISO on hot strength and reactivity gave values of CSR and CRI of 22% and 41.5%, respectively. Received brex can be used as a reducing agent in smelting in blast furnaces, as well as the carburizing material in electric arc and induction furnaces.

Thus, the use of brex made by hard vacuum extrusion for use as a reductant in metallurgical furnaces in accordance with the invention, reduces the cost of the melted metal through them to replace coke.

1. The use of pellet extrusion (Brex) coke, obtained by the method of the hard vacuum extrusion, including coke breeze, mineral binder and, if necessary, brown coal coke as a reductant in metallurgical furnaces.

2. Application Brex according to claim 1, characterized by the fact that ka is este mineral binder is cement and if necessary, the bentonite.

3. Application Brex according to claim 1, characterized in that the particle size of the materials included in the mixture for the production Brex, does not exceed 5 mm, weight Brex not exceed 0.3 kg



 

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