CN109071360A - Refractory material aggregate, its manufacturing method and the refractory material using the aggregate - Google Patents

Refractory material aggregate, its manufacturing method and the refractory material using the aggregate Download PDF

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CN109071360A
CN109071360A CN201780021773.XA CN201780021773A CN109071360A CN 109071360 A CN109071360 A CN 109071360A CN 201780021773 A CN201780021773 A CN 201780021773A CN 109071360 A CN109071360 A CN 109071360A
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aggregate
refractory material
particle
mass
raw material
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CN109071360B (en
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野野垣良三
平田慧
小山厚德
池田达哉
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Denka Co Ltd
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Denki Kagaku Kogyo KK
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    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
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Abstract

Project: it is utilizing with CaO6Al2O3(CA6) in the unsetting refractory material for the thermal insulation aggregate manufacture of the Porous of crystalline phase, it is ensured that enough intensity inhibits removing, fragmentation.Solution: water absorption rate when sieving the partial size for 3mm more than and less than 6mm, based on boiling method specified in JIS R 2205:1992 is 50% or more and 100% hereinafter, bulk density is made to be 0.40g/cm3Above and 0.60g/cm3Hereinafter, thus improving the breakdown strength of CA6 particle, and using CA6 particle manufacture refractory material, the area at the interface of CA6 particle and base matter in refractory material increases, and binding force enhancing, the intensity of refractory material is improved.

Description

Refractory material aggregate, its manufacturing method and the refractory material using the aggregate
Technical field
The present invention relates to the refractory material aggregate that can be used in fields of refractory materials such as furnace material relevant to steel etc., systems Make method, and using the refractory material of the aggregate, more particularly to thermal insulation, application property, long-time stability refractory material With aggregate and its manufacturing method.
In extensive refractory material relevant to the steel field using one of field as refractory material aggregate, previous Brickwork engineering method based on setting refractory material is for the mechanization bring the realized in recent years Labor-saving constructed and the section of repairing Resource-saving, to having used the brickwork method of unsetting refractory material to change.In the brickwork method for having used unsetting refractory material, Produce the necessity largely constructed using force lift.
On the other hand, in recent years, due to environmental problem and must not will not power in CO2Emission reduction, have studied following scheme: logical The thermal insulation for improving refractory material used in heating furnace relevant to steel etc. is crossed to cut down CO2Discharge rate.
The insulation used as previous related to steel, in order to improve thermal insulation, main stream approach is will be ceramic fine Dimension is inserted between refractory material and supporting mass, still, in Japan, is implemented since in November, 2015 to labor safety correlation method Following revision: " the second class object of management refractory ceramic fibre (RCF) being appended in " particular chemicals (the second substance) " In matter ", the exploitation of high refractory material is promoted not using ceramic fibre and thermal insulation.
Background technique
Following scheme is proposed in patent document 1: using CaO6Al in refractory material aggregate2O3(calcium hexaluminate, this It is also denoted as CA6 afterwards), thus a kind of refractory material that thermal insulation is excellent is provided.The refractory material of proposition is the CA6 grain of Porous with aggregate Son, thermal insulation is high, heat resistance, mechanical strength, to be expected to as high not using ceramic fibre and thermal insulation The aggregate of refractory material.The volume of the stomata of the per unit weight of aggregate is bigger, and thermal insulation is higher.It can be by being based on JIS R The water absorption rate of the boiling method of defined in 2205:1992 " measuring method of the apparent porosity water absorption rate specific gravity of refractory brick " Measuring method the volume of the stomata of per unit weight is evaluated.
Following insulating refractory is proposed in patent document 2, the insulating refractory contain fire resistance powder composition and Construction water, the fire resistance powder composition are combined in coarse grain domain with CaO6Al2O3For the thermal insulation of the Porous of crystalline phase Aggregate is combined with aluminum oxide raw material and alundum cement in particle domain, which can be used in adding steel disc The insulation of the coverings such as hot stove, the skid pipe of soaking pit or support tube that the skid pipe is supported.
Existing technical literature
Patent document
Patent document 1:PCT/WO00/30999 bulletin
Patent document 2: Japanese Unexamined Patent Publication 2009-203090 bulletin
Summary of the invention
Subject to be solved by the invention
One of construction method as unsetting refractory material, has carried out following construction method: will contain refractory material aggregate And the casting material and water of alundum cement mix resulting unsetting refractory material material pour cast from it is framed.If after construction Intensity is insufficient, then refractory material can generate removing, fragmentation, leads to CO because of thermal insulation deficiency2Discharge rate increases, in addition to this, also The rising of cost can be generated due to the repairing to refractory material.
Be formed as constructing as follows using CA6 particle as the refractory material of aggregate: the CA6 particle as porous body is scattered in surrounding The matrix part being made of aluminum oxide raw material and alundum cement.It is believed that the situation of the breakdown strength deficiency in CA6 particle In the case that the combination at lower or CA6 particle and matrix interface is insufficient, removing, the fragmentation of refractory material can be caused.
In order to solve the above problems, the present inventor is concentrated on studies, result obtain following opinion from And complete the present invention: maintaining high using the porosity and the CA6 particle of broken shape that bulk density is low manufacture refractory material In the case of, the area at the interface of CA6 particle and base matter in refractory material is big, binding force enhances, thus the intensity of refractory material Improved.
In addition, present inventor obtains following opinion so as to complete the present invention in the manufacturing process of CA6 particle: passing through Suitable borax is added in raw material, the CA6 particle of the low broken shape of bulk density is easy to get, is utilizing the CA6 particle In the case where manufacturing refractory material, breakdown strength is improved.
Means for solving the problems
That is, being characterized the present invention relates to a kind of unsetting refractory material aggregate and being that crystalline phase is CA6, screening is 3mm Water absorption rate when partial size more than and less than 6mm, based on boiling method specified in JIS R 2205:1992 be 50% or more and 100% or less and bulk density be 0.40g/cm3Above and 0.60g/cm3Refractory material aggregate below, preferably comprises 0.02 mass % or more and 0.4 mass % boron below.
In addition, the refractory material uses the refractory material aggregate, by alundum cement the invention further relates to a kind of refractory material As bond material.
Moreover, it relates to a kind of manufacturing method of refractory material aggregate, wherein make containing calcium oxide raw material with And after the aggregate raw material of alumina raw material is mixed with water, formed, it is burnt into and is obtained described resistance at 1000 DEG C~1700 DEG C Fiery object aggregate, which is characterized in that add borax in the aggregate raw material.The manufacturing method is preferably following refractory material bone The manufacturing method of material, wherein the additive amount for being added to the borax in the aggregate raw material is 0.1 mass % or more and 4.0 matter Measure % or less.
The effect of invention
According to the present invention, it in the refractory material aggregate that crystalline phase is CA6, the porosity is maintained high and accumulates being made In the case where the CA6 particle of low density broken shape, the area at the interface of CA6 particle and base matter in refractory material increases, Binding force enhancing, can improve the intensity of refractory material.
Detailed description of the invention
Fig. 1 is to show the X-ray diffraction of the CA6 particle of the embodiment of the present invention in a manner of comparing with comparative example Analyze the figure of result.
Specific embodiment
Hereinafter, the present invention is described in detail.
In the manufacture of CA6 particle, it is preferable that other than the aggregates raw material such as calcium oxide raw material and alumina raw material, also Mixing borax or mixing borax are simultaneously crushed, by the CaO and Al of the calcium aluminate finally synthesized2O3Molar ratio be deployed into greatly The component ratio of about 1:6 after being kneaded and formed together with water, is burnt into 1000 DEG C~1700 DEG C of temperature, for Thus obtained substance, is crushed using pulverizer and manufactures CA6 particle.
As calcium oxide raw material, powdered lime stone, quick lime or CaOAl can be used2O3(CA)、CaO· 2Al2O3(CA2)、12CaO·7Al2O3(C12A7)、3CaO·Al2O3(C3A) etc., it can also be applied in combination in above-mentioned raw materials Plurality of raw materials.
As alumina raw material, aluminium oxide (Al can be used2O3), gibbsite (Al (OH)3), boehmite (AlO (OH)) Deng the plurality of raw materials in above-mentioned raw materials can also be applied in combination.However, it is known that preferably making to synthesize the CA6 particle of porous body It is used as the gibbsite of the hydrate of aluminium.By using the alumina raw material containing gibbsite, it is easy to get squamaceous Porous body made of the primary crystallization cohesion of CA6 constructs, thus it is preferred that.
In addition, the porous body of the synthesis more CA6 of stomata is effective in order to embody higher thermal insulation.Therefore, excellent Pore creating material is added in choosing in the feed.For example, being added to inflammable substance as pore creating material in raw material, pore creating material is fired in firing It burns, gasification, CA6 particle in post synthesis forms gap, forms the CA6 particle more than stomata.As pore creating material, starch can be used (cornstarch), polyvinyl alcohol, methylcellulose, acrylic resin, latex etc..Wherein, if using starch (cornstarch), Then less expensive and be capable of forming tens μm size gap, thus it is preferred that.
By cornstarch be used as pore creating material in the case where, preferably its additive amount be total raw material in 5 mass % or more and 50 mass % or less.This is because adding if additive amount can not obtain sufficient effect less than 5 mass %, as pore creating material In the case that dosage is greater than 50 mass %, the volume of stomata becomes excessive, to can not obtain enough as refractory material aggregate Mechanical strength, in addition to this, also composition cost increase the main reason for.
In the manufacturing method of refractory material aggregate of the invention, borax (Na is added preferably in aggregate raw material2B4O5 (OH)4·8H2O).By adding borax, following effect can be obtained: the borax plays a role in firing as fluxing agent, leads to The diffusion for being formed by liquid phase and promoting various raw materials is crossed, the residual of unreacting material is inhibited, in addition, squamaceous Combination enhancing between the primary crystallization of CA6, so that the intensity as CA6 particle improves.
Preferably, the additive amount for being added to the borax in aggregate raw material is 0.1 mass % or more and 4.0 mass % or less. The reason is that if additive amount less than 0.1 mass %, is unable to fully obtain the effect of improved strength, in addition, if additive amount is big In 4.0 mass %, then densified because of the progress of sintering, the volume of the stomata of the per unit weight of aggregate reduce and can not Obtain sufficient thermal insulation.
As the method mixed to raw materials such as calcium oxide raw material, alumina raw material, pore creating material, boraxs, have no especially It limits, each material can be cooperated with defined ratio, be mixed using V-type mixing machine, taper blender, nauta mixer, disc type The mixing machines such as machine and Ao Muning mixing machine (omni mixer) are equably mixed.Special limit is had no for incorporation time Fixed, optimum value is different according to mixing machine, and preferably 5 minutes or more, more preferable 15 minutes or more.And not specified incorporation time is upper Limit.
In the manufacturing method of refractory material aggregate of the invention, it is preferable that contain calcium oxide raw material and oxidation After the mixed raw material and water of aluminum feedstock are mixed, formed, puts into firing furnace, burnt with 1000 DEG C~1700 DEG C of temperature At.If firing temperature is lower than 1000 DEG C, firing is become inadequate, and unreacting material residual becomes the intensity as refractory material The bad reason of stability insufficient, under high temperature when use.In addition, to firing temperature is set higher than 1700 DEG C, then equipment Can become enlargement, on the other hand, with 1700 DEG C at a temperature of carry out being burnt into resulting substance compared with, the physical property of CA6 particle Almost have not been changed.As process for calcining, the equipment such as electric furnace, shuttle kiln, rotary kiln can be used.
In the manufacturing method of refractory material aggregate of the invention, the CA6 burned material of firing is crushed to using pulverizer Granularity appropriate.It as the pulverizer used, is not defined, but preferably ball mill, hammer grinding machine, vibrating mill, tower mill The pulverizers such as machine, ring-roller mill, injector-type mill.
It was found by the inventors of the present invention that when CA6 burned material made of addition borax will be utilized to crush as targeted particle size, appearance The CA6 particle for easily obtaining the low broken shape of bulk density, using CA6 particle manufacture refractory material, in refractory material CA6 particle and base matter interface area is big, binding force enhances, the intensity of refractory material is improved.
It is believed that the abrasion of section when crushing is inhibited by the mechanical strength for enhancing CA6 burned material, so as to Enough CA6 particles for manufacturing the low broken shape of bulk density after being pulverized.It is preferred that containing in the unsetting refractory material aggregate of CA6 particle The amount of some boron is 0.02 mass % or more and 0.4 mass % or less.The reason is that if being difficult to less than 0.02 mass % The effect of improved strength is sufficiently obtained, in addition, then densified because of the progress of sintering if more than 0.4 mass %, aggregate The volume of the stomata of per unit weight reduces and is difficult to obtain sufficient thermal insulation.
If just to manufacture the low CA6 particle of bulk density, such as can be by increasing the amount of pore creating material, improving The volume of the stomata of CA6 particle and realize, still, if stomata is more, the mechanical strength of CA6 particle itself can be damaged, therefore, use The intensity of refractory material when refractory material aggregate can be damaged.Therefore, press down by the volume of the stomata of the per unit weight of aggregate Bulk density is reduced in the state that system is within the scope of certain to be necessary the improved strength of refractory material.
In addition, the inventors found that: when the CA6 burned material using addition borax manufacture is crushed, it is easy The CA6 particle with desired water absorption rate (porosity) and bulk density is obtained, other than borax, if there is addition to remain same The raised additive of water absorption rate and hardness of sample or the breaking method that can obtain desired bulk density, then also can be realized Effect of the invention.
The target value of the pore volume of per unit weight as aggregate, can be by being based on advising in JIS R2205:1992 The measuring method of the water absorption rate of fixed boiling method is evaluated.The present inventor is to the sufficient intensity for obtaining refractory material The required water absorption rate of CA6 particle and the range of bulk density is investigated, as a result, it has been found that: when screening is 3mm or more and small The water absorption rate when partial size of 6mm, being obtained based on boiling method specified in JIS R 2205:1992 be 50% or more and 100% or less, bulk density 0.40g/cm3Above and 0.60g/cm3When range below, the intensity and thermal insulation of refractory material Equilibrium condition it is excellent.If water absorption rate is lower than 50%, the small in size and thermal insulation of stomata is reduced, if water absorption rate is greater than 100%, The then remitted its fury of the strength reduction of CA6 particle and refractory material.Similarly, if bulk density is lower than 0.40g/cm3, then refractory material Remitted its fury, if bulk density be greater than 0.60g/cm3, then thermal insulation reduces.
Unsetting insulating refractory of the invention by by the water of specified amount be added to containing crystalline phase be CA6, screening be Water absorption rate when partial size of the 3mm more than and less than 6mm, being obtained based on boiling method specified in JIS R 2205:1992 is 50% or more and 100% or less and bulk density be 0.40g/cm3Above and 0.60g/cm3Refractory material aggregate below and In the casting material of alundum cement, the substance after mixing is poured and casts from framed and forms.
For example, using the CA6 particle of the invention containing 40 mass of mass %~70 %, 40 mass of mass %~60 % Alundum cement, 0 mass of mass %~10 % alumina powder of the partial size less than 45 μm casting material.If CA6 particle is matched Resultant is greater than 70 mass %, then the intensity of refractory material is insufficient, if the use level of CA6 particle can not be obtained less than 40 mass % Sufficient thermal insulation.In addition, sufficient thermal insulation can not be obtained if the use level of alundum cement is greater than 60 mass %, if The use level of alundum cement is less than 40 mass %, then the intensity of refractory material is insufficient.Alumina powder of the partial size less than 45 μm because With reacting for alundum cement and become the matrix composition of insulating refractory, with the unmated alumina powder the case where compared with, by force Degree is improved, even if alumina powder is set as to be greater than 10 mass %, also can not further improve intensity.
Special limit is had no for the mixed method of each material in the manufacturing method of unsetting insulating refractory of the invention It is fixed, it can be following method, based on the manufacturing method of common unsetting refractory material, cooperated in a manner of becoming defined ratio It is each to constitute raw material, it is mixed using ball mill, V-type mixing machine, taper blender, nauta mixer, pan type mixer and Ao Muning The mixing machines such as conjunction machine are equably mixed.
In the construction of unsetting insulating refractory of the invention, the water of specified amount is added in the casting material and is carried out Allotment is kneaded.It is preferred that the use level of the water added is calculated as 40 matter of mass %~60 relative to tret other than the total amount of casting material Measure %.If being unable to ensure sufficient mobility less than 40 mass %, be easy to appear construction it is bad, in addition, if more than 60 matter % is measured, then causes strength reduction because the density of refractory material reduces.
Hereinafter, based on embodiment, invention is further explained.
[Examples 1 to 5, comparative example 1~3]
Calcium carbonate or calcium hydroxide as calcium oxide raw material are being weighed, as alumina raw material using proportion shown in table 1 Aluminium hydroxide, the cornstarch as pore creating material, after the borax as additive, mixed using nauta mixer. In addition, the ratio of calcium oxide raw material and alumina raw material shown in setting table 1 is to form CaO6Al2O3。
< uses material >
Calcium carbonate: stern mine stern lime stone
Calcium hydroxide: industry system is stepped in position
Aluminium hydroxide: Sumitomo Chemical C301N
Cornstarch: Nihon Cornstarch corporation Y-3P
Borax: and Wako Pure Chemical Industries Dehybor
Mixed raw material is shaped to about using pan-type pelletizerHereinafter, being loaded into the appearance of oxidation aluminum Device, (air atmosphere) is burnt into electric furnace with temperature shown in table 1.Then, CA6 natural cooling obtained is burnt It is crushed at object using ring-roller mill and the unsetting refractory material aggregate using CA6 as crystalline phase has been made.Pass through ICP (inductance coupling Closing plasma, Inductively Coupled Plasma) luminescence analysis contains the boron of the aggregate of CA6 particle obtained Amount is determined.In addition, being partial size of the 3mm more than and less than 6mm by the aggregate screening of CA6 particle obtained, to water suction Rate, bulk density, aggregate are resistance to loaded to be determined.Its result is shown in table 1.
< water absorption rate measuring method >
By based on rule in JIS R 2205:1992 " apparent porosity of refractory brick-water absorption rate-specific gravity measuring method " The measuring method of the water absorption rate of fixed boiling method is determined.Water absorption rate due to aggregate and the refractory material using its manufacture Therefore thermal conductivity negative correlation can obtain the water absorption rate of the refractory material of sufficiently low thermal conductivity and then set for 50% or more For zero (qualification), it is set as less than 50% × (unqualified).
< sedimentating density measuring method >
It is 15.8cm that the aggregate of CA6 particle obtained, which is packed into internal volume,3Vial in until from the bottle of vial It mouthful overflows, implements tapping (falling from the height of 1cm) several times and then strike off the aggregate overflowed from the bottleneck of vial, it will be by Internal volume is set as bulk density except the resulting value of incrementss of the weight of vial.
The resistance to measuring method > loaded of < aggregate
The aggregate of the CA6 particle of 1 3mm~6mm is placed on horizontal platform, the face having with platform parallel is utilized Load measurement device pressing CA6 particle aggregate, it is resistance to loaded that the maximum load until aggregate destruction is set as aggregate.This Place, as the resistance to qualified or not determinating reference loaded of aggregate, 10N or more is then set as zero (qualification), be then set as less than 10N × (unqualified).
The case where by the Examples 1 to 5 of table 1 it is found that in the range of boron content is in the 0.02 mass % of mass %~0.4 Under, the resistance to up to 10N or more loaded of aggregate.On the other hand, in the case where being not added with borax and manufacture CA6 particle, stomata is more And water absorption rate is made to be more than 100%, therefore, the resistance to value loaded of aggregate is lower than 10N.In addition, containing as shown in comparative example 2 in boron In the case that amount is more than 0.4 mass %, although the resistance to up to 66.3N loaded of aggregate, the value of water absorption rate is 50% below low Value, it is believed that be unfavorable for insulating characteristics.The aggregate of the CA6 particle of comparative example 3 contains the boron of 0.02 mass % or more, although tool Have so that the stomata that water absorption rate is 50% or more, but the value of bulk density is 0.6g/cm3Above high level.It can consider this It is because firing temperature is low, and the effect for adding boron becomes inadequate, in the crushing of CA6 burned material, it is difficult to obtain broken shape CA6 particle.
The X-ray diffraction analysis evaluation of the aggregate of the CA6 particle of Examples 1 to 5 and comparative example 1~3 is shown in table 1 As a result, shown in Fig. 1 embodiment 1, embodiment 3, comparative example 3 CA6 particle aggregate X-ray diffraction spectra.As implemented 1~embodiment of example 5 and Comparative Examples 1 and 2 are such, in the case where firing temperature is 1450 DEG C, using calcium carbonate or calcium hydroxide When as calcium oxide raw material, it is respectively formed almost single-phase CA6.On the other hand, by comparative example 3 it is found that being lower than in firing temperature In the case where 1000 DEG C, a large amount of Al as unreacting material of residual2O3, CaO and the CaO as reaction intermediate 2Al2O3(CA2), firing temperature is too low.
[table 1]
[embodiment 6~10, comparative example 4~6]
The aggregate for the CA6 particle that will be obtained in Examples 1 to 5 and comparative example 1~3 is weighed with proportion shown in table 2 Screening is for 3mm more than and less than the partial size of 6mm (coarse grain), 1mm more than and less than the partial size of 3mm (middle grain), the partial size less than 1mm (particle) resulting substance, the alumina powder that average grain diameter is 2 μm, alundum cement, then add the water of specified amount, utilize The mixing of omnipotent mixer, then pour cast from 40mm × 40mm × 160mm it is framed in, 20 DEG C at a temperature of solidified, taken off Mould, then 110 DEG C at a temperature of implement drying in 24 hours, thus to obtain using CA6 particle as the refractory material of aggregate.
< uses material >
Alumina powder: Showa electrician AL-170
Alundum cement: DENKA High Alumina Cement Super
It is assumed that use condition of the refractory material in practical furnace, has carried out 1400 DEG C to refractory material obtained using electric furnace After heat treatment, bending strength is determined.Its result is shown in table 2.
The measuring method > of < bending strength
It is surveyed by documented method in JIS R 2553:1992 " Strength Testing Methods of casting material refractory material " It is fixed.Herein, the determinating reference qualified or not as bending strength, 1.5MPa or more are set as zero (qualification), are set as less than 1.5MPa × (unqualified).
By the embodiment 6~10 of table 2 it is found that the refractory material of the aggregate manufacture for the CA6 particle using Examples 1 to 5 For, bending strength is up to 1.5MPa or more.On the other hand, in the aggregate of the CA6 particle using the comparative example 1 for being not added with borax Comparative example 4 refractory material in the case where, the value of bending strength is lower than 1.5MPa.In addition, being more than 0.5 matter using boron content In the case where the refractory material for measuring the comparative example 5 of the aggregate manufacture of the CA6 particle of the comparative example 2 of %, although bending strength is up to 2.5MPa, but as previously mentioned, the value of the water absorption rate of comparative example 2 is 50% low value below, so as to think to be unfavorable for be insulated Characteristic.In the case where the refractory material of the comparative example 6 of the aggregate of the CA6 particle using comparative example 3 manufacture, although aggregate is resistance to loaded Lotus is 10N or more, but the value of bending strength is lower than 1.5MPa.As comparative example 3, it is in the water absorption rate of the aggregate of CA6 particle 50% or more, bulk density is higher than 0.60g/cm3In the case where, the CA6 particle of cracked shape can not be obtained, fire resisting is being made In the case where object, base matter and the area at the interface of CA6 particle are small, and binding force weakens, the remitted its fury of refractory material.
[table 2]
Industrial availability
In the manufacture of CA6 particle, by adding suitable borax in the feed, so that the breakdown strength of CA6 particle obtains To improvement, and when the CA6 burned material using addition borax manufacture and when being crushed into targeted particle size, it is close that accumulation can be made The CA6 particle for spending low broken shape, CA6 particle and base using CA6 particle manufacture refractory material, in refractory material The area at the interface of body substance is big, and binding force enhancing, the intensity of refractory material is improved.Therefore, the present invention is industrially extremely It is useful.

Claims (5)

1. a kind of refractory material aggregate, which is characterized in that crystalline phase CaO6Al2O3, sieve as 3mm more than and less than 6mm's Water absorption rate when partial size, based on boiling method specified in JIS R 2205:1992 be 50% or more and 100% hereinafter, and Bulk density is 0.40g/cm3Above and 0.60g/cm3Below.
2. refractory material aggregate according to claim 1, which is characterized in that contain 0.02 mass % or more and 0.4 matter Measure % boron below.
3. refractory material according to claim 1 or 2 is used aggregate as aggregate, by alundum cement by a kind of refractory material As bond material.
4. a kind of manufacturing method of refractory material aggregate as claimed in claim 2, which is characterized in that make containing calcium oxide raw material And after the aggregate raw material of alumina raw material is mixed with water, formed, it is burnt at 1000 DEG C~1700 DEG C and obtains right It is required that refractory material aggregate described in 2, wherein add borax in the aggregate raw material.
5. the manufacturing method of refractory material aggregate according to claim 4, wherein the boron being added in the aggregate raw material The additive amount of sand is 0.1 mass % or more and 4.0 mass % or less.
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