WO2017057566A1 - 不定形耐火物 - Google Patents
不定形耐火物 Download PDFInfo
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- WO2017057566A1 WO2017057566A1 PCT/JP2016/078806 JP2016078806W WO2017057566A1 WO 2017057566 A1 WO2017057566 A1 WO 2017057566A1 JP 2016078806 W JP2016078806 W JP 2016078806W WO 2017057566 A1 WO2017057566 A1 WO 2017057566A1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
Definitions
- the present invention relates to an irregular refractory mainly used in a steelmaking processing apparatus.
- This application claims priority based on Japanese Patent Application No. 2015-191739 filed in Japan on September 29, 2015, and Japanese Patent Application No. 2016-180517 filed on September 15, 2016 in Japan. And the contents thereof are incorporated herein.
- amorphous refractories of alumina-magnesia and alumina-spinel are widely used as refractories that come into contact with molten steel and slag.
- alumina is used as a binder for these irregular refractories.
- Cement is used.
- These irregular-shaped refractories are given a predetermined shape by pouring construction after being kneaded with water, and Ca 2+ ions and Al (OH) 4 ⁇ ions are eluted and precipitated from the alumina cement of the binder during curing. A hydrate is formed, and the strength required as a structure is developed.
- alumina cement contains CaO ⁇ Al 2 O 3 and CaO ⁇ 2Al 2 O 3 as main components, and some alumina cements contain 12CaO ⁇ 7Al 2 O 3 and Al 2 O 3 as well.
- ⁇ Al 2 O 3 CaO ⁇ 2Al 2 O 3 and 12CaO ⁇ 7Al 2 O 3 from Ca 2+ ions and Al (OH) 4 - ions are eluted.
- alumina cement is an important raw material for imparting strength to the amorphous refractory, but since alumina cement has a high CaO content, it is generated by other raw materials in the amorphous refractory and steelmaking treatment. In order to react with the slag which forms and to form a low melt, there exists a fault which reduces the corrosion resistance with respect to the slag of an amorphous refractory.
- the amorphous refractory cured by the reaction of magnesia and oxycarboxylic acid polyvalent metal salt disclosed in Patent Document 1 reacts with Mg 2+ ions eluted from magnesia raw material and oxycarboxylic acid polyvalent metal salt.
- the bonded portion is generated by gelation. Therefore, in order to obtain a sufficient cured state, a very fine and active magnesia raw material must be used. When a very fine and active magnesia raw material is not used, the elution rate of Mg 2+ ions is slow, so that the strength of the amorphous refractory is very slow and the strength is low.
- magnesia raw material may become inactive due to carbonation due to carbon dioxide in the air or hydroxylation due to water vapor, and if the magnesia raw material is inactivated in this way depending on storage conditions
- the amorphous refractory has very slow strength and low strength.
- the amorphous refractory using Ca X Sr 1-X Al 2 O 4 disclosed in Patent Document 2 as a binder is more hydrated than the conventional refractory using alumina cement. Since the production of is slow, the development of strength is slow and the strength is low. From Ca X Sr 1-X Al 2 O 4 , Sr 2+ ions elute in addition to Ca 2+ ions and Al (OH) 4 ⁇ ions, so it is possible to increase the amount of ultrafine powder and increase the strength by aggregation. However, when the amount of ultrafine powder is increased, sintering proceeds at a high temperature, so that the heat resistant spalling property of the amorphous refractory decreases, and the occurrence of crack peeling during use increases.
- the problem to be solved by the present invention is that alumina cement is not used, or the amount of alumina cement used is very small, the strength expression of the amorphous refractory with low CaO content is accelerated, and There is to make it high strength.
- the content of Ca X Sr 1-X Al 2 O 4 (where 0 ⁇ X ⁇ 0.5) is a proportion of 100% by mass of the refractory raw material having a particle size of 8 mm or less. It is an amorphous refractory having a content of 0.5% by mass or more and 10% by mass or less and a polyvalent metal salt of oxycarboxylic acid of 0.05% by mass or more and 1.0% by mass or less.
- the content of the polyvalent metal salt of the oxycarboxylic acid may be 0.1% by mass or more and 1.0% by mass or less.
- the content of the spinel material having a particle size of 0.1 mm or less is 5% in the proportion of 100% by mass of the refractory material.
- the mass may be not less than 25% by mass.
- the total content of at least one of the above may be 55% by mass or more and 75% by mass or less. It is in.
- a conventional polyvalent metal of magnesia and oxycarboxylic acid is used. Curing is quicker than that using a combination of salts, and a high-strength amorphous refractory can be obtained, and the change with time when stored for a long time is very small. Further, it is possible to obtain an amorphous refractory having a high strength and a much faster curing than using Ca X Sr 1-X Al 2 O 4 alone.
- alumina cement is not used, or the amount of alumina cement used is very small, and the strength development of the amorphous refractory with low CaO content is accelerated, and high The strength can be increased, and the change with time during long-term storage can be reduced.
- the irregular refractory according to an embodiment of the present invention will be described in detail.
- the amorphous refractory according to the present embodiment can be mainly applied to an alumina-magnesia amorphous refractory and an alumina-spinel amorphous refractory.
- the amorphous refractory according to the present embodiment is an alumina-magnesia amorphous refractory, typically, a main raw material comprising an alumina raw material, a magnesia raw material and ultrafine silica, and Ca X Sr 1-X Al It is composed of a binder composed of 2 O 4 (where 0 ⁇ X ⁇ 0.5) and a polyvalent metal salt of oxycarboxylic acid, and an admixture and an admixture used for ordinary amorphous refractories.
- ultrafine silica may not be used.
- a part of the alumina raw material and the magnesia raw material can be replaced with a spinel raw material.
- the amorphous refractory according to the present embodiment is an alumina-spinel-type amorphous refractory, typically, a main raw material composed of an alumina raw material and a spinel raw material, and Ca X Sr 1-X Al 2 O 4 (However, 0 ⁇ X ⁇ 0.5) and a binder composed of a polyvalent metal salt of oxycarboxylic acid, and an admixture and an admixture used for ordinary amorphous refractories.
- a part of the alumina raw material and the spinel raw material can be replaced with a magnesia raw material.
- the admixture refers to organic fibers, Al powder, metal fibers, etc. that are used in ordinary amorphous refractories, and the admixture is a water reducing agent that is used in ordinary irregular refractories, An AE agent, an antifoaming agent, a curing modifier, a fluidity modifier, a magnesia digestion inhibitor, an explosion inhibitor, and the like. And in this specification, the whole raw material of the amorphous refractory except the said admixture is called a refractory raw material.
- the amorphous refractory according to this embodiment uses a polyvalent metal salt of an oxycarboxylic acid together with Ca X Sr 1-X Al 2 O 4 (where 0 ⁇ X ⁇ 0.5) as a binder.
- Ca X Sr 1-X Al 2 O 4 in the amorphous refractory kneaded with water elutes Sr 2+ ions, Ca 2+ ions, Al (OH) 4 ⁇ ions, and the polyvalent metal salt of oxycarboxylic acid is It reacts with these eluted ions to gel and develop strength.
- the formation of hydrates is slow, resulting in slow strength and low strength.
- a polyvalent metal salt of oxycarboxylic acid is used in combination, Since the formation of the bonding portion by the gelation of the polyvalent metal salt of carboxylic acid is added, the strength is quickly developed and the strength is increased.
- the strength expression is faster and higher than the conventional method of generating a bond portion by combining a very fine active magnesia raw material and a polyvalent metal salt of oxycarboxylic acid.
- the reaction of MgO and water is MgO + H 2 O ⁇ Mg (OH) 2 , the amount of Mg (OH) 2 dissolved in 100 g of water (25 ° C.) is about 1 mg, and the pH of the dissolved water is about 10. 5.
- the reaction of SrO and water in Ca X Sr 1-X Al 2 O 4 is SrO + H 2 O ⁇ Sr (OH) 2 , and Sr (OH) 2 into 100 g (25 ° C.) of water.
- the dissolved amount is about 1 g, and the pH of the dissolved water is about 13.5.
- Sr (OH) 2 has a large amount dissolved in water, that is, a large amount of Sr 2+ ions are eluted from Ca X Sr 1-X Al 2 O 4. Is done.
- the pH of the polyvalent metal salt of oxycarboxylic acid increases, gelation proceeds.
- the basic aluminum lactate that is one of the polyvalent metal salts of oxycarboxylic acid has a pH of 10 or more, gelation proceeds. It has been reported.
- the method using Ca X Sr 1-X Al 2 O 4 has a higher ion elution amount and a higher pH than the conventional method using a magnesia raw material. It is estimated that gelation is fast and many gels are formed.
- the combination of the conventional magnesia raw material and the polyvalent metal salt of oxycarboxylic acid exhibits strength only by gel formation of the polyvalent metal salt of oxycarboxylic acid, whereas Ca X Sr 1-X Al 2 O 4
- the combination of polyvalent metal salts of oxycarboxylic acid, the formation of gel of polyvalent metal salt of oxycarboxylic acid and the formation of hydrate of Ca X Sr 1-X Al 2 O 4 occur simultaneously, resulting in higher strength It is estimated that a simple coupling part is generated. This is also considered as a factor that the amorphous refractory according to the present embodiment is stronger in strength than the conventional one and becomes high in strength.
- the conventional method of generating a bond by combining a magnesia raw material and a polyvalent metal salt of oxycarboxylic acid has a small amount of Mg 2+ ion elution from magnesia as described above. In order to increase the production amount, it is necessary to use a very fine active magnesia raw material.
- magnesia raw materials may become inactive due to carbonation by carbon dioxide in the air or hydroxylation by water vapor, and if the magnesia raw material is inactivated in this way depending on storage conditions
- the amorphous refractory exhibits very slow strength and low strength, but the use of the Ca X Sr 1-X Al 2 O 4 of this embodiment causes little deterioration due to such a change with time.
- the present inventors use strontia as a complex oxide of Ca X Sr 1-X Al 2 O 4 , the elution rate of Sr 2+ ions is suppressed, and thus the gelation rate of the polyvalent metal salt of oxycarboxylic acid It was also found that the curing rate can be controlled to be suitable for the construction of the irregular refractory, and the strength becomes high as described above.
- the polyvalent metal salt of oxycarboxylic acid is gelled by Ca 2+ ions and Al (OH) 4 ⁇ ions eluted from the alumina cement.
- the combination of X Sr 1-X Al 2 O 4 and the polyvalent metal salt of oxycarboxylic acid exhibits faster strength and higher strength.
- the amount of Ca X Sr 1-X Al 2 O 4 used is 0.5% by mass or more and 10% by mass or less as a proportion of 100% by mass of the refractory raw material having a particle size of 8 mm or less. And If it is less than 0.5% by mass, curing of the irregular refractory is slow and the strength is insufficient. On the other hand, if it exceeds 10% by mass, the amorphous refractory is hardened too quickly, and is easily sintered at a high temperature, so that the heat-resistant spalling property is lowered. Further, the value of X of Ca X Sr 1-X Al 2 O 4 is set to 0 ⁇ X ⁇ 0.5.
- Ca Y Sr 1-Y Al 4 O 7 (Ca Y Sr 1- X Al 2 O 4, which is the same CaO—SrO—Al 2 O 4 solid solution as Ca X Sr 1-X Al 2 O 4 ( However, 0 ⁇ Y ⁇ 0.5) and 12 (CaO) Z (SrO) 1-Z ⁇ 7Al 2 O 3 (where 0 ⁇ Z ⁇ 0.5) can be used, but Ca X Sr 1 -X Al 2 O 4 and Ca Y Sr 1-Y Al 4 O 7 and 12 (CaO) Z (SrO) 1-Z ⁇ 7Al 2 O 3 in a total use amount of refractory raw material having a particle size of 8 mm or less 100% by mass It is preferable to make it into 10 mass% or less in the ratio for which it accounts for.
- Y and Z are 0 ⁇ Y ⁇ 0.5 and 0 ⁇ Z ⁇ 0.5. This is similar to Ca X Sr 1-X Al 2 O 4 when Y and Z are greater than 0.5. This is because the CaO content increases and the corrosion resistance of the amorphous refractory decreases.
- Ca X Sr 1-X Al 2 O 4 , Ca Y Sr 1-Y Al 4 O 7 , 12 (CaO) Z (SrO) 1- Alumina cement can be used in addition to Z ⁇ 7Al 2 O 3.
- CaO contained in the alumina cement decreases the corrosion resistance of the amorphous refractory, so Ca X Sr 1-X Al 2 O 4 , Ca Y Sr 1-Y Al 4 O 7 , 12 (CaO) Z (SrO) 1-Z ⁇ 7Al 2 O 3
- CaO contained in alumina cement is 0% in proportion to 100% by mass of the refractory raw material having a particle size of 8 mm or less. It is preferable to set it to 5 mass or less.
- limestone mainly CaCO 3
- quick lime mainly CaO
- purified alumina ⁇ -Al 2 O 3 , Al (OH) 3
- bauxite Al 2 O 3 raw material
- strontium ore SrCO 3
- celestite SrSO 4
- melting or firing at a high temperature of 1100 ° C. or higher, preferably 1300 ° C. or higher, more preferably 1500 ° C. or higher in a mold furnace, a shaft kiln, or a rotary kiln.
- a high-purity material in which the total of CaO, Al 2 O 3 and SrO in the raw material is 98% by mass or more is preferable.
- Impurities such as TiO 2 , MgO, Fe 2 O 3 and the like contained in bauxite and celestite may cause a decrease in physical properties at high temperatures, and are preferably as small as possible.
- these raw materials Prior to melting or firing, these raw materials are preferably pulverized by a pulverizer to a 50% average diameter of about 0.5 to 100 ⁇ m. When coarser particles are included, a large number of unreacted portions remain, and the original effect of the amorphous refractory according to the present embodiment may be difficult to be exhibited. Further, after melting or firing, it is preferably cooled and sized by a pulverizer to a particle size of about 1 to 20 ⁇ m. This particle size is a result of measurement by a particle size analyzer such as a laser diffraction method, a laser scattering method, or a sedimentation balance method, and represents a 50% average diameter.
- a particle size analyzer such as a laser diffraction method, a laser scattering method, or a sedimentation balance method, and represents a 50% average diameter.
- the raw materials can be mixed using a mixer such as an Eirich mixer, rotary drum, cone blender, V-type blender, omni mixer, nauter mixer, pan-type mixer.
- a mixer such as an Eirich mixer, rotary drum, cone blender, V-type blender, omni mixer, nauter mixer, pan-type mixer.
- an industrial pulverizer such as a vibration mill, a tube mill, a ball mill, or a roller mill can be used.
- a part of raw material used for an amorphous refractory material can also be grind
- Ca Y Sr 1-Y Al 4 O 7 and 12 (CaO) Z (SrO) 1-Z ⁇ 7Al 2 O 3 have the same composition as that of Ca X Sr 1-X Al 2 O 4 . It can be prepared by blending raw materials so as to have a molar ratio. Further, not only the Ca X Sr 1-X Al 2 O 4 phase but also the Ca Y Sr 1-Y Al 4 O 7 phase or the 12 (CaO) Z (SrO) 1-Z ⁇ 7Al 2 O 3 phase The raw materials can be blended in the same manner.
- the amount of polyvalent metal salt of oxycarboxylic acid used is 0.05% by mass or more and 1.0% by mass or less in a proportion of 100% by mass of the refractory raw material of 8 mm or less. . If it is less than 0.05% by mass, the amorphous refractory is hardened slowly and has insufficient strength. If it exceeds 1.0% by mass, the shrinkage during curing and drying of the amorphous refractory considered to be caused by gel shrinkage is considered. Becomes larger and the volume stability becomes worse.
- the amount of polyvalent metal salt of oxycarboxylic acid used is 100% by mass of a refractory raw material of 8 mm or less in order to accelerate curing. It is preferably 0.1% by mass or more and 1.0% by mass or less as a percentage of the total.
- polyvalent metal salt of oxycarboxylic acid examples include glycolic acid, lactic acid, hydroacrylic acid, oxybutyric acid, glyceric acid, malic acid, tartaric acid, citric acid and other aliphatic oxycarboxylic acid aluminum salts, iron salts, chromium salts, Normal salts and basic salts such as zirconium salts and titanium salts can be used.
- examples thereof include commercially available aluminum lactate, basic aluminum lactate, aluminum glycolate, lactic acid / aluminum glycolate, and basic lactic acid / aluminum glycolate.
- the amorphous refractory according to the present embodiment is an alumina-magnesia amorphous refractory
- Ca X Sr 1-X Al 2 O 4 (provided that the proportion is 100% by mass of the refractory raw material having a particle size of 8 mm or less) 0 ⁇ X ⁇ 0.5) in an amount of 0.5% by mass to 10% by mass and a polyvalent metal salt of oxycarboxylic acid in an amount of 0.05% by mass to 1.0% by mass. It is preferable that 3 mass% or more and 12 mass% or less of magnesia raw materials of 1 mm or less are included. By adjusting in this way, it is possible to obtain an amorphous refractory having an appropriate strength development time, high strength, high corrosion resistance and high slag infiltration resistance, and high heat resistance spalling properties.
- the amorphous refractory according to the present embodiment is an alumina-spinel amorphous refractory
- the Ca X Sr 1-X Al 2 O 4 ( However, 0 ⁇ X ⁇ 0.5) is contained in an amount of 0.5% by mass or more and 10% by mass or less
- a polyvalent metal salt of oxycarboxylic acid is contained in an amount of 0.05% by mass or more and 1.0% by mass or less. It is preferable to contain 5% by mass or more and 25% by mass or less of a spinel raw material of 0.1 mm or less.
- the refractory raw material having a particle size of more than 0.1 mm and not more than 8 mm that serves as an aggregate can mainly comprise at least one of an alumina raw material and a spinel raw material. Typically, it is a proportion of 100% by mass of the refractory raw material having a particle size of 8 mm or less, and the total content of at least one of alumina raw material and spinel raw material having a particle size of more than 0.1 mm and 8 mm or less is 55% by mass to 75% by mass. % Or less.
- refractory raw material main raw material
- amorphous refractory according to the present embodiment examples of the refractory raw material (main raw material) that can be suitably used for the amorphous refractory according to the present embodiment are as follows.
- alumina raw material a raw material manufactured by electromelting or sintering and having a particle size adjusted, and a raw material manufactured by a Bayer method called calcined alumina are used.
- the alumina raw material produced by electromelting or sintering and adjusted in particle size has an Al 2 O 3 content of 90% by mass or more, preferably 99% by mass or more.
- Calcinated alumina is a raw material called reactive alumina or calcined alumina.
- Spinel raw materials include MgO—Al 2 O 3 based compounds, chemical composition of MgO ⁇ Al 2 O 3 stoichiometric composition, and non-stoichiometric composition of MgO or Al 2 O 3 in excessive solid solution
- a raw material that is manufactured by electromelting or sintering and whose particle size is adjusted is used.
- a raw material in which spinel and alumina are combined can also be used.
- magnesia raw material a raw material which is manufactured by electromelting or sintering and whose particle size is adjusted is used. It is preferable to use a magnesia raw material having high digestion resistance so that the magnesia raw material is digested during drying and cracks due to volume expansion do not occur.
- the digestion resistant high magnesia raw material those CaO and low CaO / SiO 2 in the SiO 2 which is an impurity, having no fractured plane, it is like those surface coating.
- magnesia raw material reacts with the alumina raw material during use to produce spinel, so if the fine magnesia raw material is used, the generated spinel becomes finer and corrosion resistance and slag infiltration resistance increase, and if the coarse magnesia raw material is used, volume expansion occurs.
- the rate of spinel formation shown is slowed down, and the irregular refractory exhibits continued residual expansivity, resulting in fewer cracks.
- Ultra fine silica is an amorphous SiO 2 material having a particle size of 1 ⁇ m or less, called silica flour, silica fume, fumed silica, micro silica, evaporated silica, or silica dust, and is composed of Si, Fe—Si, In general, the SiO gas generated during the production of ZrO 2 or the like is generated by oxidation in air.
- Ultrafine silica is an alumina-magnesia amorphous refractory, and it is 100% by mass of refractory raw material with a particle size of 8mm or less for the purpose of preventing digestion of magnesia raw material, reducing expansion due to spinel formation, and imparting creep property during use. It is preferable to use in the range of 2 mass% or less.
- a used refractory brick or a so-called recycled raw material obtained by reusing the irregular refractory can be used.
- the recycled material it is preferable to reuse used refractory bricks or amorphous refractories made of alumina-spinel or alumina-magnesia.
- the refractory raw material having a particle size larger than 8 mm is used for the purpose of preventing crack extension and reducing the occurrence of cracks and peeling, or enhancing the corrosion resistance with a dense and large aggregate.
- the amount used is preferably 40% by mass or less as an outer shell with respect to 100% by mass of the refractory raw material having a particle size of 8 mm or less.
- zirconia, mullite, alumina-zirconia, zirconia-mullite, chromia, etc. can be used as other refractory raw materials. It is preferable to make it 10 mass% or less in the ratio which occupies 100 mass% of refractory raw materials with a diameter of 8 mm or less.
- the amorphous refractory according to this embodiment described above can be suitably used for casting construction and wet spraying construction.
- Tables 1 to 3 show the raw material configurations and evaluation results of Examples 1 to 29 and Comparative Examples 1 to 5 of the present invention.
- sintered alumina having an Al 2 O 3 content of 99.5% by mass, a particle size range of 8-0.1 mm and 0.1 mm or less, and an MgO content of 27 Sintered spinel with a particle size range of 8-0.1 mm and 0.1 mm or less at a mass percent, calcined alumina with an average particle size of 1.5 ⁇ m, a MgO content of 95.2 mass percent and a particle size range of 0.001.
- a polyvalent metal salt of a carboxylic acid, Polycarboxylic acid-based water reducing agent and the curing modifier was appropriately using 0.2 mass% in total as fine admixture.
- Ca X Sr 1-X Al 2 O 4 , Ca Y Sr 1-Y Al 4 O 7 , 12 (CaO) Z (SrO) 1-Z ⁇ 7Al 2 O 3 were produced by the following methods, respectively.
- CaCO 3 having a purity of 99% by mass, SrCO 3 having a purity of 98% by mass, and high-purity ⁇ -alumina having a purity of 99% by mass were used.
- Each raw material was weighed with a balance so as to have the chemical composition shown in Tables 1 to 3 (X value, Y value, Z value), and 1% by mass was externally added to the raw material mixed and ground in a mortar. After granulating and forming by adding water, heat treatment at 1400 ° C.
- the polyvalent metal salt of oxycarboxylic acid used basic aluminum lactate as polyvalent metal salt A of oxycarboxylic acid, and basic lactic acid / aluminum glycolate as polyvalent metal salt B of oxycarboxylic acid.
- Hardening time in Tables 1 to 3 indicates that the hardening time when a material kneaded with an amount of water capable of obtaining an appropriate fluidity is cured at 20 ° C. is 3 hours or more and 8 hours or less. ⁇ is marked as appropriate for construction. In addition, if it is a little shorter than 2 hours and less than 3 hours, or a little longer than 8 hours and within 12 hours, it is marked with ⁇ , and if it is very short as less than 2 hours or longer than 12 hours, X mark.
- “Change over time” is the measurement of the curing time of materials stored in a paper bag for 90 days under the same conditions as “curing time” in the previous section. A mark which is larger than 30% is marked with ⁇ , and a mark which is larger than 30% is marked with X.
- Dry shrinkage refers to a test piece that has been kneaded in a 40 ⁇ 40 ⁇ 160 mm shape with a water content that provides adequate fluidity, cured at 20 ° C. for 24 hours, and then dried at 110 ° C. for 24 hours.
- a circle with a small shrinkage ratio in the longitudinal direction after drying of 0.1% or less is marked.
- a mark larger than 0.1% but within 0.2% is marked with ⁇ , and a mark larger than 0.2% is marked with X.
- “Bending strength” is a three-point bending strength of a test piece after drying at 110 ° C. where “drying shrinkage” was measured. In addition, those with 5 MPa or more and less than 8 MPa are marked with ⁇ , and those with lower strength than 5 MPa are marked with X.
- “Rotating erosion spall” is a test piece prepared by casting a material kneaded with an amount of water that gives an appropriate fluidity, cured at 20 ° C. for 24 hours, dried at 110 ° C. for 24 hours, Using, after the test piece was heated to 1650 ° C., the converter slag was charged and held for 1 hour, and then the slag was discharged and air-cooled for 30 minutes. evaluated. ⁇ mark indicates that melting and cracking were both minor, ⁇ indicates that either is minor, and the other is not extremely bad, and ⁇ indicates that neither is minor. .
- Examples 1 to 29 in Tables 1 and 2 are examples of the present invention, and amorphous refractories with good overall evaluation of curing time, drying shrinkage, bending strength and rotational erosion spall were obtained.
- Example 11 to 15 “Ca X Sr 1-X Al 2 O 4 (where 0 ⁇ X ⁇ 0.5) and Ca Y Sr 1-Y Al 4 O 7 (where 0 ⁇ Y ⁇ 0.5) and 12 (CaO) Z (SrO) 1-Z ⁇ 7Al 2 O 3 (where 0 ⁇ Z ⁇ 0.5) ”is a preferred range (10 mass% or less) of Examples 11 to The overall evaluation of 14 is ⁇ . However, in Example 15 out of the range, a good amorphous refractory can be obtained, but the overall evaluation is a little inferior.
- Examples 16 to 20 Examples 17 to 19 that are in a preferable range (3 to 12% by mass) of “magnesia raw material having a particle size of 0.1 mm or less” have an overall evaluation of “ ⁇ ”. On the other hand, in Examples 16 and 20 out of the range, a good amorphous refractory can be obtained, but the overall evaluation is ⁇ .
- Examples 21 to 25 Examples 22 to 24, which are in a preferable range (5 to 25% by mass) of “spinel raw material having a particle size of 0.1 mm or less”, have an overall evaluation of “ ⁇ ”. On the other hand, in Examples 21 and 25 out of the range, a good amorphous refractory can be obtained, but the overall evaluation is ⁇ .
- Example 26 is an example in which alumina cement is used in combination, and a good amorphous refractory is obtained, but the overall evaluation is ⁇ .
- Example 29 is an example which is within the scope of the present invention but uses a small amount of oxycarboxylic acid. Although a good amorphous refractory can be obtained, the curing time is a little long, the strength is a little low, and the overall evaluation is ⁇ .
- Comparative Example 1 in Table 3 is an example in which a conventional active magnesia and a polyvalent metal salt of oxycarboxylic acid are used in combination. Curing is somewhat slow, change with time is very large, strength is slightly low, and rotational erosion There are a few cracks in the spall.
- Comparative Example 2 is an example in which the amount of Ca X Sr 1-X Al 2 O 4 used is less than the range of the present invention, the curing is slightly slow, the change over time is slightly large, the strength is low, and cracks occur in the rotary erosion spall. Slightly more.
- Comparative Example 3 is an example in which the amount of Ca X Sr 1-X Al 2 O 4 used is larger than the range of the present invention, the curing time is slightly short, the curing shrinkage is slightly large, and there are many cracks in the rotating erosion spall.
- Comparative Example 4 is an example in which the value of X of Ca X Sr 1-X Al 2 O 4 is larger than the range of the present invention, the curing shrinkage is somewhat large, and the corrosion resistance at the rotary erosion spall is poor.
- Comparative Example 5 is an example in which the amount of polyvalent metal salt of oxycarboxylic acid used is less than the range of the present invention, the curing time is very long, and the strength is very low.
- Comparative Example 6 is an example in which the amount of polyvalent metal salt of oxycarboxylic acid used is larger than the range of the present invention, the curing time is slightly short, and the drying shrinkage is very large.
- the alumina cement is not used, or the amount of the alumina cement used is very small, and the strength development of the amorphous refractory having a low CaO content is accelerated and the strength is increased. it can.
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Abstract
Description
本願は、2015年9月29日に、日本に出願された特願2015-191739号、及び、2016年9月15日に、日本に出願された特願2016-180517号に基づき優先権を主張し、その内容をここに援用する。
(1)本発明の一態様は、粒径8mm以下の耐火原料100質量%に占める割合で、CaXSr1-XAl2O4(但し、0≦X≦0.5)の含有量が0.5質量%以上10質量%以下、オキシカルボン酸の多価金属塩の含有量が0.05質量%以上1.0質量%以下である不定形耐火物である。
(2)上記(1)に記載の不定形耐火物では、前記オキシカルボン酸の多価金属塩の含有量が0.1質量%以上1.0質量%以下であってもよい。
(3)上記(1)又は(2)に記載の不定形耐火物では、粒径8mm以下の耐火原料100質量%に占める割合で、CaXSr1-XAl2O4(但し、0≦X≦0.5)とCaYSr1-YAl4O7(但し、0≦Y≦0.5)と12(CaO)Z(SrO)1-Z・7Al2O3(但し、0≦Z≦0.5)の合計の含有量が10質量%以下であってもよい。
(4)上記(1)から(3)のいずれか一項に記載の不定形耐火物では、前記耐火原料100質量%に占める割合で、粒径0.1mm以下のマグネシア原料の含有量が3質量%以上12質量%以下であってもよい。
(5)上記(1)から(3)のいずれか一項に記載の不定形耐火物では、前記耐火原料100質量%に占める割合で、粒径0.1mm以下のスピネル原料の含有量が5質量%以上25質量%以下であってもよい。
(6)上記(1)から(5)のいずれか一項に記載の不定形耐火物では、前記耐火原料100質量%に占める割合で、粒径0.1mm超8mm以下のアルミナ原料及びスピネル原料の少なくとも1種の合計の含有量が55質量%以上75質量%以下であってもよい。
にある。
本実施形態に係る不定形耐火物は、主に、アルミナ-マグネシア質不定形耐火物、アルミナ-スピネル質不定形耐火物に適用することができる。
実施例29は、本発明の範囲内であるがオキシカルボン酸の使用量が少ない例である。良好な不定形耐火物が得られるが、硬化時間が少し長く、強度が少し低く、総合評価が△である。
Claims (6)
- 粒径8mm以下の耐火原料100質量%に占める割合で、CaXSr1-XAl2O4(但し、0≦X≦0.5)の含有量が0.5質量%以上10質量%以下、オキシカルボン酸の多価金属塩の含有量が0.05質量%以上1.0質量%以下である
ことを特徴とする不定形耐火物。 - 前記オキシカルボン酸の多価金属塩の含有量が0.1質量%以上1.0質量%以下である
ことを特徴とする請求項1に記載の不定形耐火物。 - 粒径8mm以下の耐火原料100質量%に占める割合で、CaXSr1-XAl2O4(但し、0≦X≦0.5)とCaYSr1-YAl4O7(但し、0≦Y≦0.5)と12(CaO)Z(SrO)1-Z・7Al2O3(但し、0≦Z≦0.5)の合計の含有量が10質量%以下である
ことを特徴とする請求項1又は2に記載の不定形耐火物。 - 前記耐火原料100質量%に占める割合で、粒径0.1mm以下のマグネシア原料の含有量が3質量%以上12質量%以下である
ことを特徴とする請求項1から3のいずれか一項に記載の不定形耐火物。 - 前記耐火原料100質量%に占める割合で、粒径0.1mm以下のスピネル原料の含有量が5質量%以上25質量%以下である
ことを特徴とする請求項1から3のいずれか一項に記載の不定形耐火物。 - 前記耐火原料100質量%に占める割合で、粒径0.1mm超8mm以下のアルミナ原料及びスピネル原料の少なくとも1種の合計の含有量が55質量%以上75質量%以下である
ことを特徴とする請求項1から5のいずれか一項に記載の不定形耐火物。
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KR1020187008028A KR101945680B1 (ko) | 2015-09-29 | 2016-09-29 | 부정형 내화물 |
ES16851737T ES2785524T3 (es) | 2015-09-29 | 2016-09-29 | Material refractario monolítico |
US15/763,699 US10414695B2 (en) | 2015-09-29 | 2016-09-29 | Monolithic refractory |
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JPH0648845A (ja) * | 1992-07-14 | 1994-02-22 | Taiko Rozai Kk | 不定形耐火材 |
JP2003201183A (ja) * | 2001-12-28 | 2003-07-15 | Kurosaki Harima Corp | 流し込み施工用耐火物 |
WO2009130811A1 (ja) * | 2008-04-25 | 2009-10-29 | 新日本製鐵株式会社 | 不定形耐火物用結合剤及び不定形耐火物 |
WO2011136365A1 (ja) * | 2010-04-28 | 2011-11-03 | 新日本製鐵株式会社 | 不定形耐火物用結合剤、不定形耐火物、及び不定形耐火物の施工方法 |
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JPH0648845A (ja) * | 1992-07-14 | 1994-02-22 | Taiko Rozai Kk | 不定形耐火材 |
JP2003201183A (ja) * | 2001-12-28 | 2003-07-15 | Kurosaki Harima Corp | 流し込み施工用耐火物 |
WO2009130811A1 (ja) * | 2008-04-25 | 2009-10-29 | 新日本製鐵株式会社 | 不定形耐火物用結合剤及び不定形耐火物 |
WO2011136365A1 (ja) * | 2010-04-28 | 2011-11-03 | 新日本製鐵株式会社 | 不定形耐火物用結合剤、不定形耐火物、及び不定形耐火物の施工方法 |
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