CN107176845A - A kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick - Google Patents
A kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick Download PDFInfo
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
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Abstract
The invention provides a kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick, its process flow steps is by the classification of waste and old refractory brick, selection, on the basis of reworked material gross mass, according to MgO >=86%, SiO2≤ 3.5%, Al2O3≤ 4.5%, surplus carries out dispensing, broken, iron removal by magnetic separation, gradation, heat drying for the proportioning of impurity, and high pressure is formed by a firing after charging kneading, and regenerative magnesia-carbon brick is obtained after cooling.The present invention produces regenerative magnesia-carbon brick using waste and old refractory brick, and technique is simple, it is possible to reduce the waste to waste and old refractory brick, is conducive to the regeneration of waste material and the raising of added value, and obtained regenerative magnesia-carbon brick properties are good, with considerable economic benefit.
Description
Technical field
Regenerative magnesia-carbon brick is produced the present invention relates to technical field of refractory materials, more particularly to a kind of waste and old refractory brick of utilization
Method.
Background technology
In recent years, with the swift and violent growth of China's iron and steel output, the consumption of domestic refractory material is also greatly increased, wherein
Waste and old refractory material proportion reaches the 45% of refractory material total flow, and the processing mode of current waste and old refractory material
Be still it is most of be taken as industrial refuse to bury, only utilized on a small quantity by coarse.Waste and old refractory material is taken as garbage disposal
Fall, this not only adds processing cost, certain pollution is caused to environment, the resource of preciousness is wasted again, very unfortunately.Mesh
Before, domestic waste refractory materials reuse ratio is not high, its Land use systems excessively simple, unification, not with advanced technology
It is combined.
" a kind of method that recycling discards magnesite-dolomite refractories ", its notification number are disclosed in Chinese patent literature
For CN 105481351A, the invention is calcareous to discarded magnesium by process procedures such as cutting, crushing, screening, dispensing, granulation, sintering
Dross layer, the metamorphic layer of refractory material take recycling, can largely handle discarded magnesia-calcium brick, realize the calcareous fire proofed wood of magnesium
The recycling of material.But, the invention is not high to the recovery utilization rate for discarding magnesite-dolomite refractories, in addition, not right
The basic performance indices of reconstituted product detect that its performance can not be guaranteed.Therefore, how to strengthen and economize on resources and environmental protection meaning
Know, using technological innovation as power, improve the regeneration rate of waste and old refractory material, exploitation high-performance reconstituted product is this area skill
Art personnel technical problem urgently to be resolved hurrily.
The content of the invention
The present invention causes the wasting of resources, then make profits to overcome current domestic waste refractory materials processing mode unreasonable
With rate, there is provided a kind of waste and old refractory brick production regeneration of the utilization that regeneration rate is high, reconstituted product performance is good the problem of not high
The method of magnesia carbon brick.
To achieve these goals, the present invention uses following technical scheme：
A kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick, is comprised the following steps：
（1）Waste and old refractory brick is divided into magnesium carbonaceous, magnalium carbonaceous, four kinds of classifications of aluminium carbonaceous and aluminium silicon carbide carbonaceous；
（2）Choose step（1）In classified waste and old refractory brick, on the basis of reworked material gross mass, according to following component content
Proportioning carries out dispensing：MgO >=86%, SiO2≤ 3.5%, Al2O3≤ 4.5%, surplus is impurity, obtains reworked material；
（3）Reworked material is crushed, regenerated granule material is obtained, and iron removal by magnetic separation is carried out to regenerated granule material；
（4）Regenerated granule material after iron removal by magnetic separation is subjected to gradation；
（5）Regenerated granule material after classification is thermally dried；
（6）Weighing is first carried out according to the proportioning of following parts by weight：65 parts of regenerated granule material, 15 parts of thermosetting resin, 8 parts of graphite,
12 parts of oxidationization aluminium regenerative micro powder, 10 parts of corundum powder, 5 parts of bonding agent, then charging kneading is carried out, charging sequence is：First add
Regenerated granule material, adds the thermosetting resin for accounting for thermosetting resin total amount 2/3, then sequentially adds graphite, oxidationization aluminium again
Raw micro mist, remaining thermosetting resin, are eventually adding corundum powder and bonding agent, 20 ~ 30min of batch mixing under the conditions of 60 ~ 80 DEG C；
（7）By step（6）The mixture of gained carries out high-pressure molding, is burnt in 1400 DEG C ~ 1600 DEG C of hyperthermia tunnel Kilns
Into 6 ~ 8h of insulation obtains regenerative magnesia-carbon brick after cooling.
Step（1）In, the dry slag layer impurity on waste and old refractory brick surface is removed while classification.The present invention is in reworked material
Agent can be burnt as rush by adding appropriate aluminum oxide so that be more densified in product sintering process, while can also be by filling out
Stomata in product is filled, the bulk density of regenerative magnesia-carbon brick is improved so that the performance of regenerative magnesia-carbon brick is lifted accordingly.Graphite
With high temperature resistant, heat conduction, conduction, lubrication, plastic and anticorrosive etc. performance, the performance of regenerative magnesia-carbon brick can be strengthened.Use height
Warm tunnel cave is fired, and is worked using countercurrent action, it has preheating zone, clinkering zone, the temperature of the part of cooling zone three, can keep
Certain temperature range, is easily mastered the rule of burning till of regenerative magnesia-carbon brick, therefore the quality of obtained regenerative magnesia-carbon brick is preferable, breaks
Loss rate is low.Preferably, step（2）Described in impurity amount be no more than 6%, appropriate impurity can improve regenerative magnesia-carbon brick
Corrosion resistance.
Preferably, on the basis of regenerated granule material gross mass, step（4）The regenerated granule material of gained after middle gradation
Grade and weight/mass percentage composition be respectively：5 ~ 3mm particle account for 25% ~ 35%, 3 ~ 1mm particle account for 45% ~ 55% and 0.5 ~
0.1mm particle accounts for 10% ~ 25%.
The consistency of the paired base substrate of particle group of blank has a great impact, and certain amount is added in the composition of bulky grain
The less particle of size, is filled in the gap of bulky grain, and the porosity of base substrate can be caused to decline, bulk density increase, makes embryo
Body becomes the product with certain size, shape and structural strength so that the bulk density of material, compressive resistance and high temperatures
It can be improved, be obviously improved the physicochemical property of regenerative magnesia-carbon brick.
Preferably, step（5）The process conditions of middle heat drying are：5 ~ 10 DEG C/min of heating rate, is warming up to 350 DEG C
5 ~ 8h is incubated afterwards, and control heating rate to be heated evenly in the sintering procedure of regenerative magnesia-carbon brick, not easy to crack, and increase uses strong
Degree.
Preferably, the one kind of the thermosetting resin in polybutadiene, organic siliconresin and furane resins.
The carbonation rate of thermosetting resin dispensing is high, caking property is good, and the blank strength of shaping is high, can strengthen regenerative magnesia-carbon brick
Performance.
Preferably, step（6）Described in graphite particle diameter be 50 ~ 150 mesh, the bonding agent be pitch.
Preferably, step（7）The pressure limit of mesohigh shaping is obtained magnesium in 200 ~ 260Mpa, this pressure limit
Carbon brick bulk density is high, and performance is good.
The present invention has the advantages that：
（1）Regenerative magnesia-carbon brick is generated using waste and old refractory brick, technique is simple, it is possible to reduce the waste to waste and old refractory brick；
（2）The recycling of waste and old refractory material is conducive to the regeneration of waste material and the raising of added value；
（3）The regenerative magnesia-carbon brick properties produced using waste and old refractory brick as raw material are good, with considerable economic benefit.
Embodiment
Below by specific embodiment, technical scheme is described in further detail.
Embodiment 1
（1）Waste and old refractory brick is divided into magnesium carbonaceous, magnalium carbonaceous, four kinds of classifications of aluminium carbonaceous and aluminium silicon carbide carbonaceous；
（2）Choose step（1）In classified waste and old refractory brick, on the basis of reworked material gross mass, according to following component content
Proportioning carries out dispensing：86% MgO, 3.5% SiO2, 4.5% Al2O3, surplus is impurity, obtains reworked material；
（3）Reworked material is crushed, regenerated granule material is obtained, and iron removal by magnetic separation is carried out to regenerated granule material；
（4）Regenerated granule material after iron removal by magnetic separation is subjected to gradation, on the basis of regenerated granule material gross mass, middle particle point
The grade and weight/mass percentage composition of the regenerated granule material of gained are respectively after level：The particle that 5 ~ 3mm particle accounts for 35%, 3 ~ 1mm is accounted for
55% and 0.5 ~ 0.1mm particle accounts for 10%.
（5）Heating rate by the regenerated granule material after classification in 10 DEG C/min is thermally dried, and is warming up to after 350 DEG C
It is incubated 8h；
（6）Weighing is first carried out according to the proportioning of following parts by weight：65 parts of regenerated granule material, 15 parts of polybutadiene, graphite 8
Part, 12 parts of oxidationization aluminium regenerative micro powder, 10 parts of corundum powder, 5 parts of bonding agent, then charging kneading is carried out, charging sequence is：First plus
Enter regenerated granule material, add the polybutadiene for accounting for polybutadiene total amount 2/3, then sequentially adding average grain diameter is
The graphite of 50 mesh, oxidationization aluminium regenerative micro powder, remaining polybutadiene, are eventually adding corundum powder and pitch, in 60 DEG C
Under the conditions of batch mixing 20min；
（7）By step（6）The mixture of gained carries out high-pressure molding in 200Mpa, in 1400 DEG C ~ 1600 DEG C of hyperthermia tunnel Kiln
It is interior to be burnt till, 6h is incubated, regenerative magnesia-carbon brick is obtained after cooling.
Embodiment 2
（1）Waste and old refractory brick is divided into magnesium carbonaceous, magnalium carbonaceous, four kinds of classifications of aluminium carbonaceous and aluminium silicon carbide carbonaceous；
（2）Choose step（1）In classified waste and old refractory brick, on the basis of reworked material gross mass, according to following component content
Proportioning carries out dispensing：90% MgO, 2.5% SiO2, 2.5% Al2O3, surplus is impurity, obtains reworked material；
（3）Reworked material after iron removal by magnetic separation is crushed, regenerated granule material is obtained, and magnetic separation is carried out to regenerated granule material and remove
Iron；
（4）Regenerated granule material is subjected to gradation, on the basis of regenerated granule material gross mass, obtained by after middle gradation again
The grade and weight/mass percentage composition of raw particulate material be respectively：5 ~ 3mm particle account for 30%, 3 ~ 1mm particle account for 45% and 0.5 ~
0.1mm particle accounts for 25%.
（5）Heating rate by the regenerated granule material after classification in 5 DEG C/min is thermally dried, and is warming up to after 350 DEG C
It is incubated 5h；
（6）Weighing is first carried out according to the proportioning of following parts by weight：65 parts of regenerated granule material, 15 parts of organic siliconresin, 8 parts of graphite,
12 parts of oxidationization aluminium regenerative micro powder, 10 parts of corundum powder, 5 parts of bonding agent, then charging kneading is carried out, charging sequence is：First add
Regenerated granule material, adds the organic siliconresin for accounting for organic siliconresin total amount 2/3, then sequentially adds average grain diameter for 100 mesh
Graphite, oxidationization aluminium regenerative micro powder, remaining organic siliconresin, corundum powder and pitch are eventually adding, under the conditions of 80 DEG C
Batch mixing 30min；
（7）By step（6）The mixture of gained carries out high-pressure molding in 260Mpa, in 1400 DEG C ~ 1600 DEG C of hyperthermia tunnel Kiln
It is interior to be burnt till, 8h is incubated, regenerative magnesia-carbon brick is obtained after cooling.
Embodiment 3
（1）Waste and old refractory brick is divided into magnesium carbonaceous, magnalium carbonaceous, four kinds of classifications of aluminium carbonaceous and aluminium silicon carbide carbonaceous；
（2）Choose step（1）In classified waste and old refractory brick, on the basis of reworked material gross mass, according to following component content
Proportioning carries out dispensing：95% MgO, 1.5% SiO2, 0.5% Al2O3, surplus is impurity, obtains reworked material；
（3）Reworked material after iron removal by magnetic separation is crushed, regenerated granule material is obtained, and magnetic separation is carried out to regenerated granule material and remove
Iron；
（4）Regenerated granule material is subjected to gradation, on the basis of regenerated granule material gross mass, obtained by after middle gradation again
The grade and weight/mass percentage composition of raw particulate material be respectively：5 ~ 3mm particle account for 25%, 3 ~ 1mm particle account for 52% and 0.5 ~
0.1mm particle accounts for 23%.
（5）Heating rate to the regenerated granule material after classification in 5 DEG C/min is thermally dried, and is warming up to after 350 DEG C
It is incubated 5h；
（6）Weighing is first carried out according to the proportioning of following parts by weight：65 parts of regenerated granule material, 15 parts of furane resins, 8 parts of graphite, oxygen
12 parts of changeization aluminium regenerative micro powder, 10 parts of corundum powder, 5 parts of bonding agent, then charging kneading is carried out, charging sequence is：First add again
Raw particulate material, adds the furane resins for accounting for furane resins total amount 2/3, then sequentially add graphite that average grain diameter is 150 mesh,
Oxidationization aluminium regenerative micro powder, remaining furane resins, are eventually adding corundum powder and pitch, the batch mixing 25min under the conditions of 70 DEG C；
（7）By step（6）The mixture of gained carries out high-pressure molding in 230Mpa, in 1400 DEG C ~ 1600 DEG C of hyperthermia tunnel Kiln
It is interior to be burnt till, 8h is incubated, regenerative magnesia-carbon brick is obtained after cooling.
Performance detection is carried out to regenerative magnesia-carbon brick made from the present embodiment：Each 3 pieces of sample preparation of embodiment difference, at 110 DEG C
Vacuumized after drying to constant weight, detection bulk density and the porosity；Each 3 pieces of sample preparation of embodiment difference, in 110 DEG C of drying to perseverance
Weight, detects cold crushing strength.Testing index is as shown in table 1：
Table 1. utilizes the physical and chemical index of regenerative magnesia-carbon brick made from waste and old refractory brick
| Embodiment | Apparent porosity（%） | Bulk density（g/cm3） | Cold crushing strength (Mpa) |
| Embodiment 1 | 4.1 | 2.95 | 42 |
| Embodiment 2 | 3.6 | 2.97 | 45 |
| Embodiment 3 | 3.8 | 2.98 | 50 |
According to the comparativeanalysis detected to regenerative magnesia-carbon brick, the present invention utilizes regenerative magnesia-carbon brick made from waste and old refractory brick
Physical and chemical index is very excellent, has reached the index level of normal magnesia carbon brick, can be applied to heating furnace, hot air duct and blast furnace slag
The working lining of ditch, realizes the purpose turned waste into wealth.
The present invention generates regenerative magnesia-carbon brick using waste and old refractory brick, and technique is simple, it is possible to reduce to the wave of waste and old refractory brick
Take；The recycling of waste and old refractory material is conducive to the regeneration of waste material and the raising of added value；Made with waste and old refractory brick
Not only have the advantages that cost performance is high for the regenerative magnesia-carbon brick that raw material is produced, and the recycling of waste resource can be realized, have
Beneficial to environmental protection, with good economic benefit and social benefit.
Claims (8)
1. a kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick, it is characterised in that comprise the following steps：
（1）Waste and old refractory brick is divided into magnesium carbonaceous, magnalium carbonaceous, four kinds of classifications of aluminium carbonaceous and aluminium silicon carbide carbonaceous；
（2）Choose step（1）In classified waste and old refractory brick, on the basis of reworked material gross mass, according to following component content
Proportioning carries out dispensing：MgO >=86%, SiO2≤ 3.5%, Al2O3≤ 4.5%, surplus is impurity, obtains reworked material；
（3）Reworked material is crushed, regenerated granule material is obtained, and iron removal by magnetic separation is carried out to regenerated granule material；
（4）Regenerated granule material after iron removal by magnetic separation is subjected to gradation；
（5）Regenerated granule material after classification is thermally dried；
（6）Weighing is first carried out according to the proportioning of following parts by weight：65 parts of regenerated granule material, 15 parts of thermosetting resin, 8 parts of graphite,
12 parts of oxidationization aluminium regenerative micro powder, 10 parts of corundum powder, 5 parts of bonding agent, then charging kneading is carried out, charging sequence is：First add
Regenerated granule material, adds the thermosetting resin for accounting for thermosetting resin total amount 2/3, then sequentially adds graphite, oxidationization aluminium again
Raw micro mist, remaining thermosetting resin, are eventually adding corundum powder and bonding agent, 20 ~ 30min of batch mixing under the conditions of 60 ~ 80 DEG C；
（7）By step（6）The mixture of gained carries out high-pressure molding, is burnt in 1400 DEG C ~ 1600 DEG C of hyperthermia tunnel Kilns
Into 6 ~ 8h of insulation obtains regenerative magnesia-carbon brick after cooling.
2. a kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick according to claim 1, it is characterised in that step
Suddenly（2）Described in impurity amount be no more than 6%.
3. a kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick according to claim 1, it is characterised in that with
On the basis of regenerated granule material gross mass, step（4）The grade and quality percentage of the regenerated granule material of gained contain after middle gradation
Amount is respectively：The particle that 5 ~ 3mm particle accounts for 25% ~ 35%, 3 ~ 1mm accounts for 45% ~ 55% and 0.5 ~ 0.1mm particle and accounts for 10% ~ 25%.
4. a kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick according to claim 1, it is characterised in that step
Suddenly（5）The process conditions of middle heat drying are：5 ~ 10 DEG C/min of heating rate, is warming up to 5 ~ 8h of insulation after 350 DEG C.
5. a kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick according to claim 1, it is characterised in that institute
State the one kind of thermosetting resin in polybutadiene, organic siliconresin and furane resins.
6. a kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick according to claim 1, it is characterised in that institute
The particle diameter for stating graphite is 50 ~ 150 mesh.
7. a kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick according to claim 1 or 6, its feature is existed
In the bonding agent is pitch.
8. according to any a kind of described methods that regenerative magnesia-carbon brick is produced using waste and old refractory brick of claim 1-6, its feature
It is, step（7）The pressure limit of mesohigh shaping is 200 ~ 260Mpa.
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Cited By (7)
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| CN108002818A (en) * | 2017-11-30 | 2018-05-08 | 长兴科创科技咨询有限公司 | The method of the recycling of waste and old refractory material |
| CN108675806A (en) * | 2018-06-15 | 2018-10-19 | 甘肃酒钢集团科力耐火材料股份有限公司 | A kind of regenerative magnesia-carbon brick particle disposal technique |
| CN109678534A (en) * | 2018-12-17 | 2019-04-26 | 武汉钢铁集团耐火材料有限责任公司 | Ladle Furnace Lining aluminium-magnesia carbon brick |
| CN112279555A (en) * | 2020-10-15 | 2021-01-29 | 天津炜润达新材料科技有限公司 | Method for recycling waste refractory materials |
| CN112430105A (en) * | 2020-10-30 | 2021-03-02 | 云南濮耐昆钢高温材料有限公司 | Aluminum-magnesium-carbon brick prepared from regenerated tabular corundum and preparation method thereof |
| WO2023026802A1 (en) * | 2021-08-27 | 2023-03-02 | Ｊｆｅスチール株式会社 | Recycling method for magnesia carbon bricks |
| CN116514527A (en) * | 2023-05-19 | 2023-08-01 | 洛阳利尔功能材料有限公司 | Method for preparing tundish retaining wall by using reclaimed materials |
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