WO2014010467A1 - Agent d'accélération de prise pulvérulent et procédé d'application par pulvérisation de matière réfractaire monolithique - Google Patents

Agent d'accélération de prise pulvérulent et procédé d'application par pulvérisation de matière réfractaire monolithique Download PDF

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WO2014010467A1
WO2014010467A1 PCT/JP2013/068108 JP2013068108W WO2014010467A1 WO 2014010467 A1 WO2014010467 A1 WO 2014010467A1 JP 2013068108 W JP2013068108 W JP 2013068108W WO 2014010467 A1 WO2014010467 A1 WO 2014010467A1
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Prior art keywords
powder
alumina
refractory
setting agent
nozzle
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PCT/JP2013/068108
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English (en)
Japanese (ja)
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誠司 花桐
内田　貴之
洋一 古田
淳一 佃
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黒崎播磨株式会社
新日鐵住金株式会社
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Application filed by 黒崎播磨株式会社, 新日鐵住金株式会社 filed Critical 黒崎播磨株式会社
Priority to BR112015000361-3A priority Critical patent/BR112015000361B1/pt
Priority to CN201380035044.1A priority patent/CN104507893B/zh
Priority to KR1020147028223A priority patent/KR101604259B1/ko
Publication of WO2014010467A1 publication Critical patent/WO2014010467A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/10—Monolithic linings; Supports therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
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Definitions

  • the present invention relates to a powder rapid setting agent to be added to a refractory composition that is conveyed by airflow in a pipe and a method for spraying an amorphous refractory in the spraying of an amorphous refractory.
  • Refractories are applied to the inner surface of molten metal containers such as ladle and converter.
  • This refractory is in an environment that is easily destroyed by slag contained in the molten metal or exposed to thermal shock due to the entry and exit of the molten metal. For this reason, when a refractory material is destroyed, repair of the part which was worn out by spraying the irregular refractory material is performed.
  • the quick setting agent is air-flowed through the pipe by an air compressor and mixed with the refractory composition by a nozzle.
  • the quick setting agent such as slaked lime are fine powders of about 100 ⁇ m or less, when mixed with the refractory composition, it is difficult to penetrate the refractory composition, and the quick setting agent and the refractory composition are sufficient. There was a problem of not mixing.
  • the quick setting agent is a fine particle, it has a characteristic of easily adhering to the inside of the pipe.
  • fine particles adhere to the inside of the pipe, there is also a problem that the adhering amount deviates from the designed blending components.
  • Patent Document 3 Even with the method of Patent Document 3, the mixing property between the refractory composition and the powder quick-setting agent is still insufficient, and the adhesion rate may not be improved. Further, the method of Patent Document 3 has a problem that the suppression of particulate adhesion in the pipe is insufficient, and the quick setting agent adheres to the pipe and becomes blocked.
  • the problem to be solved by the present invention is that, when spraying an amorphous refractory, when the quick setting agent is added to the refractory composition by air flow, the mixing property of the quick setting agent and the refractory composition is improved. It is to improve and prevent the powder rapid setting agent from adhering to the pipe.
  • the particle size of the refractory fine powder to be mixed with the powder quick-setting agent is such that the mixability between the fire-resistant composition and the quick setting agent,
  • it has a large influence on the adhesion property, and surprisingly, particles having a particle size of more than 0.5 mm are 5% by mass or more, and particles having a particle size of 0.1 mm or more and 5 mm or less are 30% by mass or more. It has been found that the inclusion of the quick setting agent and the refractory composition can be improved, and that the powder quick setting agent can be prevented from adhering to the pipe.
  • the gist of the present invention is as follows. (1) The powder rapid setting agent of the present invention is used when spraying a refractory, and when the refractory composition is air-flowed toward the nozzle through a pipe, the refractory composition is placed in front of the nozzle or the nozzle.
  • a powder rapid setting agent added to a product by air flow conveyance comprising: a first powder material that cures the refractory composition; and a second powder material that is a refractory raw material,
  • the powder material of No. 2 is characterized by containing 5% by mass or more of particles having a particle size of more than 0.5 mm and 30% by mass or more of particles having a particle size of 0.1 to 5 mm. .
  • the second powder material contains 10% by mass or more of particles having a particle size of 5 mm or less and more than 0.5 mm. It is preferable to do.
  • the first powder material and the second powder material may have a mass ratio of 1: 3 to 3: When the ratio of 1 (in other words, the total amount of the first powder material and the second powder material is 100% by mass), the first powder material is 25 to 75% by mass and the second powder is The material is preferably contained at 75 to 25% by mass.
  • the first powder material is slaked lime, aluminate, silicate, magnesium hydroxide, One or more selected from the group consisting of Portland cement, sulfated clay, calcium carbonate, calcium chloride, calcium oxide, calcium hydroxide and sodium phosphate are preferred.
  • the second powder material may be alumina, siliceous, alumina-silica, alumina- Spinel, alumina-magnesia, alumina-carbon, alumina-silicon carbide, alumina-silicon carbide-carbon, magnesia, magnesia-carbon, carbon, silicon carbide, silicon nitride, zirconia, calcia It is preferably one or more refractory materials selected from the group consisting of qualities, dolomite, chromia, chromia-magnesia, magnesia-lime and magnesia-alumina.
  • the present invention is a method for spraying an amorphous refractory using the powder quick-setting agent according to any one of (1) to (5) above, wherein the method is applied by airflow through a pipe.
  • the powder rapid setting agent is added to the refractory composition discharged from the nozzle by airflow conveyance in the nozzle or in the pipe before the nozzle.
  • the second powder material comprises 5% by mass or more of particles having a particle size of more than 0.5 mm, and 30% by mass or more of particles having a particle size of 0.1 mm or more. Since it contains, it has the characteristic that the particle
  • FIG. 1 is a schematic diagram showing an example of an irregular refractory spray construction apparatus.
  • a spray construction apparatus 1 shown in FIG. 1 is an apparatus for spraying and constructing an irregular refractory material on an inner wall surface of a ladle, a converter, etc., as an air flow type material conveying means 11, a material kneading means 12, and a material spraying means.
  • Nozzle 13 and quick setting agent supply means 14 are connected to each other via pipes 15, 16, 17, and 18.
  • the airflow type raw material conveying means 11 conveys the refractory composition constituting the amorphous refractory by airflow using an air compressor or the like.
  • this air flow type material conveying means 11 is provided with a tank for supplying a refractory composition, and when the refractory composition is supplied from the tank, the refractory composition is discharged from the pipe 15 using an air flow by an air compressor. And conveyed to the material kneading means 12.
  • the flow velocity in the pipe 15 is preferably 10 (m / s) or more and 30 (m / s) or less.
  • the piping 16 is connected to the upstream side of the connection portion of the piping 15 with the material kneading means 12, and the air compressor is connected to the upstream side of the piping 16, although not shown. Mist-like water is sent into the inside of the pipe 16 using the airflow of the air compressor, and the mist-like water is added from the pipe 16 to the refractory composition in the pipe 15. That is, the air compressor and the pipe 16 function as water adding means.
  • the material kneading means 12 stirs and kneads the material obtained by adding water to the refractory composition conveyed by the airflow type material conveying means 11 through the pipe 16, and the nozzle 13 mixes the material kneaded by the material kneading means 12. Spray on the construction surface.
  • the kneaded material is conveyed from the outlet of the material kneading means 12 through a pipe 17 having a length of 5 m to 20 m, for example, and discharged from the nozzle 13.
  • the quick setting agent supply means 14 conveys the powder quick setting agent by an air flow using an air compressor or the like.
  • the powder quick-setting agent is conveyed by airflow through the pipe 18 and added to the refractory composition (kneading material) in the nozzle 13 at the nozzle 13.
  • the addition amount of the powder setting agent is about 0.5 to 10% by mass as an outer shell with respect to 100% by mass of the refractory composition.
  • the flow velocity in the pipe 18 is preferably 10 (m / s) or more and 40 (m / s) or less.
  • the refractory composition used in such a spray construction apparatus 1 is not particularly limited in its material, and the main refractory raw materials are alumina, siliceous, alumina-silica, alumina-spinel, Alumina-magnesia, alumina-carbon, alumina-silicon carbide, alumina-silicon carbide-carbon, magnesia, magnesia-carbon, carbon, silicon carbide, silicon nitride, zirconia, calcia, dolomite
  • the material which is quality, chromia, chromia-magnesia, magnesia-lime, magnesia-alumina, and combinations thereof can be used without problems.
  • a material having a mineral composition similar to the refractory to be sprayed may be selected.
  • the powder quick-setting agent of the present invention contains a first powder material that cures the refractory composition and a second powder material that is a refractory raw material having fire resistance.
  • the powder quick-setting agent of the present invention needs to be a dry powder. This is because the strength of the construction body is reduced when moisture is added to the powder rapid setting agent.
  • the first powder material slaked lime, aluminate (sodium aluminate, potassium aluminate, calcium aluminate), silicate (sodium silicate, potassium silicate), magnesium hydroxide, Portland cement, sulfated clay, carbonic acid It is preferable to use a known quick-setting agent such as calcium, calcium chloride, calcium oxide, calcium hydroxide, sodium phosphate, or a combination thereof. Most of the first powder material is preferably one having a particle size of 0.075 mm or less.
  • the second powder material is not particularly limited as long as it is a refractory raw material, and the same material as the above refractory composition can be used without any problem.
  • the second powder material alumina, siliceous, alumina-silica, alumina-spinel, alumina-magnesia, alumina-carbon, alumina-silicon carbide, alumina-silicon carbide-carbon , Magnesia, magnesia-carbon, carbon, silicon carbide, silicon nitride, zirconia, calcia, dolomite, chromia, chromium-magnesia, magnesia-lime, magnesia-alumina It is preferable to use a refractory material that is a material and a combination thereof.
  • the first powder material will be described as slaked lime
  • the second powder material will be described as alumina.
  • alumina contains 5% by mass or more of particles having a particle size of more than 0.5 mm and 30% by mass or more of particles having a particle size of 0.1 to 5 mm.
  • the powder quick-setting agent according to the present invention is compared with a powder quick-setting agent that does not contain alumina, and a powder quick-setting agent that contains alumina but does not satisfy the above conditions. It has the characteristic of being easily pierced. This characteristic is due to the presence of a predetermined amount or more of 0.1 mm or more particles contained in alumina.
  • a predetermined amount or more of 0.1 mm or more particles contained in alumina One specific reason is that particles of 0.1 mm or more contained in alumina have a larger particle size than most slaked lime.
  • alumina has a higher specific gravity than slaked lime. For this reason, the 0.1 mm or more particle
  • grains of 0.1 mm or more contained in an alumina have the characteristic which is easy to pierce into a refractory composition rather than slaked lime.
  • the presence of particles of 0.5 mm or more in a predetermined amount or more increases the kinetic energy of the quick setting agent as a whole, and has the property of being easily stuck into the refractory composition.
  • slaked lime is mostly fine particles of particles smaller than 0.075 mm, it has the property of easily entering the uneven portions of alumina. For this reason, slaked lime has the property of being pierced into the refractory composition together with particles of 0.1 mm or more of alumina.
  • the powder quick-setting agent according to the present invention has a characteristic that it is easy to penetrate into the refractory composition as compared with the powder quick-setting agent not containing alumina. Thereby, the effect which improves the mixability of a powder quick-setting agent and a refractory composition is exhibited.
  • alumina needs to contain particles of 0.1 mm or more. Furthermore, particles larger than 0.5 mm have a high kinetic energy when the quick setting agent is conveyed by airflow conveyance in the pipe, and the particles larger than 0.5 mm are very effective due to the presence of a predetermined amount or more. It is possible to prevent the pipe from adhering.
  • alumina when the particles of 0.1 mm or more and 5 mm or less are less than 30% by mass or the particles of more than 0.5 mm are less than 5% by mass, the above-mentioned effects cannot be obtained sufficiently.
  • alumina contains coarse particles.
  • the particle size is 100% by mass with respect to the total amount of alumina of 100% by mass. It is preferable to contain at least 10% by mass of particles exceeding 0.5 mm.
  • the upper limit of the particle size of coarse particles in alumina is preferably 5 mm.
  • the upper limit of the particle size of coarse particles in alumina is limited by the diameter of the pipe 18.
  • the diameter of the pipe 18 is preferably about 10 mm or more and 20 mm or less.
  • the diameter of the pipe 18 is less than 10 mm, since the diameter is small, the powder rapid setting agent is likely to be blocked.
  • the diameter of the pipe 18 exceeds 20 mm, it is necessary to increase the air flow rate (air flow rate) for air-conveying the powder quick-setting agent as the diameter increases.
  • air flow rate air flow rate
  • the diameter of the pipe 18 is preferably 10 mm or more and 20 mm or less.
  • the diameter of the pipe 18 is 10 mm and the particle diameter of alumina exceeds 5 mm, the tendency of the alumina to be blocked by the pipe 18 increases.
  • the particle size of alumina is preferably 5 mm or less.
  • the content of coarse particles having a particle size of 0.1 mm or more or a particle size exceeding 0.5 mm in the above-mentioned alumina there is no upper limit to the content of coarse particles having a particle size of 0.1 mm or more or a particle size exceeding 0.5 mm in the above-mentioned alumina, and all of the alumina particles have a particle size of 0.1 mm or more or a particle size of 0.5 mm or more. It may be. Even if alumina does not contain fine particles, the refractory composition usually contains fine particles, and the amount of alumina added is very small compared to the refractory composition, which adversely affects the quality of the sprayed body. Will not affect.
  • the blending ratio of the slaked lime and alumina is from 1: 3 to 3: 1 in mass ratio, in other words, when the total amount of slaked lime and alumina is 100% by mass, It is preferable to blend slaked lime in a proportion of 25 to 75% by mass and alumina in a proportion of 75 to 25% by mass.
  • the content of slaked lime is less than 25% by mass, the component for curing the refractory composition is insufficient, and the adhesion rate to the construction surface tends to decrease.
  • the content ratio of alumina is less than 25% by mass, air transportability is lowered, and the powder quick-setting agent may adhere to the pipe in the pipe, which may block the pipe.
  • a powder quick-setting agent made of only the first powder material such as slaked lime, which is generally used in the past, is held in a storage tank for storage, or the quick-setting agent in FIG. 1 is supplied during construction.
  • the powder rapid setting agent solidifies due to reaction with water vapor in the air, making it impossible to carry the air current, so it could only be held for several hours to one day.
  • the powder quick-setting agent of the present invention is used, the presence of the second powder material such as alumina inhibits the consolidation of the first powder material such as slaked lime and holds it continuously for one week or more.
  • the powder quick-setting agent does not solidify and can maintain a state in which the air current can be conveyed over a long period of time.
  • the construction test was conducted with the spray construction equipment shown in FIG.
  • an alumina raw material whose particle size was adjusted as a refractory composition was used, and various powder quick setting agents shown in Table 1 were added.
  • the addition amount of the powder setting agent was 3% by mass as an outer shell with respect to 100% by mass of the refractory composition.
  • the powder rapid setting agent slaked lime and sodium aluminate having a particle size of 0.075 mm or less as the first powder material, and the electric powder having the predetermined particle size distribution shown in Table 1 as the second powder material. Fused alumina was used.
  • the blockage in the pipe and the adhesion rate were evaluated.
  • the adhesion rate is improved.
  • the adhesion rate was also evaluated as an evaluation item.
  • the evaluation of the blockage in the pipe was performed by the blockage rate by the powder quick-set agent on the cross section of the pipe 18 in FIG. ⁇ indicates a blocking rate of 0%, ⁇ indicates a blocking rate of 10% or less, and x indicates a blocking rate of 100%.
  • a construction object 500 mm ⁇ 500 mm shape panel, construction temperature 900 ° C. construction flow rate (output flow rate of an air compressor (not shown) connected to the airflow type material conveyance means 11 via a conveyance path) 4 to 5 (m3) / Min), a refractory composition transport rate of 20 (m / s), and a powder rapid setting agent transport rate of 25 (m / s).
  • FIG. 2 using the spray construction apparatus of FIG. 1, the mass ratio of the powder quick setting agent slaked lime and fused alumina is 1: 1, and the particle size distribution of fused alumina is changed.
  • the relationship between the adhesion rate of the obtained construction body and the apparent porosity is shown.
  • FIG. 2 shows that when the adhesion rate is 80% or more, the apparent porosity is stable at a low level, and a good construction body can be obtained.
  • (1) occlusion in the pipe is ⁇ and the adhesion rate is 80% or more, ⁇ , (2) occlusion in the pipe is o or ⁇ , and the adhesion rate is 78% or more, (3 )
  • the blockage in piping was ⁇ or x, and the adhesion rate was 75% or less as x.
  • Examples 1 to 6, Examples 8 to 10, and Examples 14 and 15 were all evaluated as ⁇ ⁇ , and good results were obtained.
  • Example 7 has a comprehensive evaluation of ⁇ , which is slightly inferior to the other examples.
  • ⁇ since the proportion of slaked lime in the total amount of slaked lime and fused alumina is as small as 20% by mass, it is estimated that the component for curing the refractory composition is insufficient and the adhesion rate is slightly reduced.
  • Example 7 is ⁇ in the comprehensive evaluation and is superior to the comparative example described later, it is at a level that is sufficiently practical in other than a severe environment.
  • Examples 11, 12 and 13 have a comprehensive evaluation of ⁇ , which is slightly inferior to the other examples. Since Examples 11, 12, and 13 contain more than 5 mm of fused alumina, it is presumed that the tendency to block the pipe 18 has increased. However, since Examples 11, 12, and 13 have a comprehensive evaluation of “ ⁇ ” and are superior to Comparative Examples described later, they are at a sufficiently practical level.
  • Comparative Examples 1 to 3 the proportion of particles having a particle size of 0.1 mm or more and 5 mm or less in the fused alumina is less than 30% by mass, the evaluation of the plugging ability is lowered, and the adhesion rate is also lowered. Yes.
  • Comparative Example 3 the ratio of fused alumina to the total amount of slaked lime and fused alumina is as low as 20% by mass.
  • Comparative Example 4 the proportion of particles having a particle size of more than 0.5 mm in the fused alumina is less than 5% by mass. For this reason, the evaluation of the piping blocking property is lowered, and the adhesion rate is also lowered.
  • Comparative Example 5 is an example in which the powder quick-setting agent contains only slaked lime. In this case, the powder quick-setting agent is difficult to penetrate into the refractory composition, and the powder quick-setting agent and the refractory composition are not sufficiently mixed.
  • the second powder material contains 5% by mass or more of particles having a particle size of more than 0.5 mm and 30% by mass or more of particles having a particle size of 0.1 mm or more.
  • the second powder material preferably contains 10% by mass or more of particles having a particle size of 5 mm or less and more than 0.5 mm.
  • the powder accelerating agent was sometimes retained in the rapid accelerating agent supply means 14 shown in FIG. 1 for one week or more. I was able to carry it.
  • the powder rapid setting agent of the present invention includes, for example, a converter, ladle, blast furnace, firewood, kneading car, electric furnace, secondary refining furnace, tundish, rotary kiln, waste melting furnace, waste ash melting furnace, incineration
  • the present invention can be widely used for spraying an irregular refractory material for repairing a lining of a molten metal container such as a furnace, a cement plant furnace, a soaking furnace, or a heating furnace, or for forming an initial lining.
  • the powder rapid setting agent of this invention can be utilized for both hot construction and cold warm construction.

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Abstract

La présente invention a pour but d'améliorer, dans une application par pulvérisation d'une matière réfractaire monolithique, non seulement l'aptitude au transport d'un agent d'accélération de prise qui est à ajouter par transport pneumatique à une composition réfractaire mais également l'aptitude au mélange de l'agent avec la composition réfractaire. La présente invention concerne un agent d'accélération de prise pulvérulent qui est à utiliser dans une application par pulvérisation d'une matière réfractaire et qui est à ajouter par transport pneumatique soit à une buse (13) soit sur le côté amont de la buse (13) à une composition réfractaire qui est transportée de façon pneumatique par la buse (13) par un tuyau (17). Cet agent d'accélération de prise pulvérulent est caractérisé en ce que : l'agent d'accélération de prise pulvérulent comprend une première matière pulvérulente qui peut durcir la composition réfractaire et une seconde matière pulvérulente qui est une matière brute réfractaire ; et la seconde matière pulvérulente contient au moins 5 % en masse de particules ayant des diamètres dépassant 0,5 mm et au moins 30 % en masse de particules ayant des diamètres de 0,1 mm ou plus.
PCT/JP2013/068108 2012-07-11 2013-07-02 Agent d'accélération de prise pulvérulent et procédé d'application par pulvérisation de matière réfractaire monolithique WO2014010467A1 (fr)

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CN201380035044.1A CN104507893B (zh) 2012-07-11 2013-07-02 粉体速凝剂及不定形耐火物的喷附施工方法
KR1020147028223A KR101604259B1 (ko) 2012-07-11 2013-07-02 분체 급결제 및 부정형 내화물의 분사 시공 방법

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EP3702338A4 (fr) 2018-03-14 2021-01-06 Denka Company Limited Agent de prise rapide en poudre, matériau à prise rapide, produit durci à base de matériau à prise rapide, et procédé de pulvérisation
JP6420922B1 (ja) * 2018-03-23 2018-11-07 黒崎播磨株式会社 不定形耐火物の吹付け施工方法及びそれに使用する吹付け材料
US11572654B2 (en) 2018-04-03 2023-02-07 Lg Electronics Inc. Clothing treatment apparatus
JP6756794B2 (ja) * 2018-10-02 2020-09-16 黒崎播磨株式会社 熱間用乾式吹付材及び熱間乾式吹付施工方法
JP7024147B1 (ja) * 2021-08-06 2022-02-22 黒崎播磨株式会社 焼成炉用の乾式吹付材
CN115652024B (zh) * 2022-12-08 2023-04-07 北京科技大学 一种再生钢铁原料电炉炼钢流程高效脱Cu的方法

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JP2001199774A (ja) * 2000-01-13 2001-07-24 Kawasaki Steel Corp 不定形耐火物の湿式吹付け施工方法

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KR101604259B1 (ko) 2016-03-17
JP5865200B2 (ja) 2016-02-17
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TWI510602B (zh) 2015-12-01

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