CN105272282A - Prefabticated member for detecting compressive strength of dry ramming material, and making method thereof - Google Patents
Prefabticated member for detecting compressive strength of dry ramming material, and making method thereof Download PDFInfo
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- CN105272282A CN105272282A CN201510632868.8A CN201510632868A CN105272282A CN 105272282 A CN105272282 A CN 105272282A CN 201510632868 A CN201510632868 A CN 201510632868A CN 105272282 A CN105272282 A CN 105272282A
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- prefabricated component
- mullite
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- powder
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Abstract
The invention relates to a prefabticated member for detecting the compressive strength of a dry ramming material. The prefabticated member comprises, by weight, 65-75 parts of mullite particles, 10-15 parts of mullite fine powder, 4-7 parts of silicon micro-powder, 10-15 parts of alumina micro-powder and 0.3-0.7 parts of an additive. The prefabticated member for detecting the dry ramming material is produced from mullite through a casting technology, the dimension of the prefabticated member accords with national standards, and measurement is accurate. Compared with a traditional sintered magnesia brick surface punching method, a method disclosed in the invention has the advantages of small difficulty and ideal formation.
Description
Technical field
The present invention relates to the field that dry type ramming material compressive strength is measured, particularly relating to a kind of prefabricated component for detecting dry type ramming material compressive strength and preparation method thereof.
Background technology
Along with the increase of countries in the world steel scrap output and the enhancing of energy-conservation environmental protection consciousness, the proportion that Electric furnace steel making output accounts for crude steel output is increasing, and since 21st century, Electric furnace steel making output has accounted for more than 30% of crude steel output.In China, Electric furnace steel making is started late, but development recent years rapidly, and China has had more than 3000 electric furnace according to statistics, and electric furnace is also more and more to ultra high power and large scale development.Advancing by leaps and bounds of Electric Furnace Steelmaking, make electric furnace refractory materials also and then quick to high life low cost future development, EAF bottom dry type ramming material is exactly low with its cost, and the features such as easy construction capture rapidly electric furnace market of fire resisting material.Dry type ramming material, at normal temperatures without bonding agent, arrives certain compressive strength by the reaction sintering at high temperature between each composition, the object playing anti-molten steel and slag action and wash away.In order to ensure the safe operation of electric furnace, electric furnace refractory materials must obtain could using after the assay was approved, and the inspection of EAF bottom dry type ramming material is the difficult problem that investigators face.
At present, the detection method of EAF bottom dry type ramming material compressive strength is: get the qualified burning magnesia brick (MZ-95) 2 pieces being of a size of (230 × 115 × 65) mm, with the hollow drill of diameter 65mm, every block is uniformly distributed in the short transverse of brick and gets out diameter × height: 3 holes of (65 × 65) mm, then the brick having bored hole is put into loft drier, dry 2h at 150 DEG C.Dried boring brick being placed on previously prepd is of a size of on the pad brick of (230 × 115 × 65) mm, boring brick and pad brick require surfacing, boring brick is forbidden there is gap with pad brick contact surface, and boring brick is for subsequent use as one group of mould together with pad brick.
Learn from else's experience and judge qualified product, after again mixing, pour diameter × height into: in 3 holes of (65 × 65) mm, manually beat reality with ramming instrument.Density after ramming should be greater than 2.7g/cm3, the material surface after ramming should with brick at grade.
Carry out with gage method, hole brick, before not putting into material, measures the height dimension of 3 borings respectively with slide calliper rule, respectively get one group of sample be placed in reheating inspection High Temperature Furnaces Heating Apparatus as the size before material burning, respectively at 1300 DEG C and 1600 DEG C of constant temperature 3h, intensification and speed of cooling are undertaken by the regulation of GB/T5988.Compressive strength is tested by GB/T5072.2.
As can be seen from detection method above, the method for making sample for compressive strength test set is more difficult, and first sintered magnesia brick intensity is very high, and getting out diameter is that the hole of 65mm is very difficult, and will have special drilling machine.Second sintered magnesia brick material is more crisp, is easy to brick to smash during boring, and the grinding tool yield rate of making is very low.3rd compressive strength is tested by GB GB/T5072.2, and GB/T5072.2 requires that sample is of a size of the right cylinder of diameter 50mm ± 2mm, high 50mm ± 2mm, and specimen size is above the right cylinder of (65 × 65) mm.Therefore can not meet the requirement of GB, the result measured has certain error.
Summary of the invention
(1) technical problem that will solve
The sintered magnesia brick material hardness used existed in the process of measurement dry type ramming material for prior art is large, crisp and frangible, the defect not easily realized, the invention provides a kind of for detecting prefabricated component of dry type ramming material (EAF bottom) compressive strength and preparation method thereof.
(2) technical scheme
Prefabricated component of the present invention, the raw material comprising following weight part is prepared from: mullite particle 65 ~ 75 parts, mullite fine powder 10 ~ 15 parts, silicon powder 4 ~ 7 parts, alumina powder 10 ~ 15 parts and additive 0.3 ~ 0.7 part.
Prefabricated component of the present invention adopts above-mentioned raw materials, can ensure that prefabricated component purity is high, volume density is large, weave construction is fine and close, compressive strength is high, creep rate is low, line change is little, has higher thermal shock resistance, well ensures institute's sample preparation block physical dimension and work-ing life.
Described mullite particle volume density>=2.5g/cm
3, preferably, Al
2o
3massfraction be 50% ~ 77%, S
io
2massfraction be massfraction≤1% of 20% ~ 40%, CaO.
The particle size range of described mullite is below 8mm, preferably the mixture of the particle of particle diameter 8 ~ 5mm, 5 ~ 3mm, 3 ~ 1mm and below 1mm; Mix by weight 11 ~ 15:15 ~ 20:19 ~ 22:20 ~ 25.
Adopt said ratio to carry out the mixture mixed, coarse particles plays skeleton function, and middle particle is just filled in coarse particles and piles up in the space formed, and fine particle just insert thick in granuloplastic space, like this, reach closestpacking, can be conducive to pour mass weave construction fine and close, intensity is high.
The particle size range of mullite fine powder of the present invention is 200 orders; Preferred wherein Al
2o
3content be 62% ~ 75%.
The particle size range of silicon powder of the present invention is 5 microns; Preferred wherein SiO
2content be greater than 97%.
The particle size range of alumina powder of the present invention is 1 micron; Preferred wherein Al
2o
3content be greater than 98%.
Prefabricated component of the present invention, wherein additive is trimerization and JG-2 (can purchased from Beijing Zhong Xing trading company), examples of such additives is conducive to dispersion, wetting and lubrication refractory raw material, affects the change of refractory materials zeta-potential, and reaches the object of prefabricated component water consumption minimizing.
Prefabricated component of the present invention is rectangular-shaped, and size range is generally preferably 350mm × 150mm × 50mm.
It is ± 2mm that prefabricated component of the present invention is provided with equally distributed 3 diameters, and height is the cylindrical bore of 50 ± 2mm.
Preferably, the raw material preparing prefabricated component of the present invention comprises mullite particle 65 ~ 75 parts, mullite fine powder 10 ~ 15 parts, silicon powder 4 ~ 7 parts, alumina powder 10 ~ 15 parts and additive 0.3 ~ 0.7 part;
Described do not come particle volume density>=2.5g/cm
3, Al
2o
3massfraction be 50% ~ 77%, S
io
2massfraction≤1% of massfraction 20% ~ 40%, CaO;
Particle diameter 200 order of described mullite fine powder; The particle diameter of described silicon powder is 5 microns, and the particle diameter of described alumina powder is 1 micron.
Utilize formula y=100 (d/D)
qcarry out the best particle size gradation of raw material, wherein, d is grain graininess; D is Particles at Critical granularity; Q is size-grade distribution coefficient, and y is a certain grade (d) less-than cumulation per-cent; Q value gets 0.26 ~ 0.35.
Another object of the present invention is to provide the preparation method of prefabricated component of the present invention, comprises the steps:
1) by load weighted alumina powder, mullite particle, mullite fine powder, silicon powder and additive are poured in forced stirrer and are stirred, and add the clean tap water that weight ratio is 4 ~ 5%, stir 3 ~ 5 minutes, obtain mould material;
2) described mould material is injected mould, vibrating forming, obtains the prefabricated component of casting complete;
3) by the demoulding after the prefabricated component of described casting complete in a mold natural curing, then secondary maintenance in maintaining box, through baking, calcines to obtain described prefabricated component.
Preferred described step 3) be specially: by the prefabricated component of described casting complete natural curing 22 ~ 26h in a mold, the demoulding, then maintenance 22 ~ 26h in the maintaining box of ambient moisture about 90 ~ 98%, after putting into 100 ~ 120 DEG C of baking oven baking 22 ~ 26h, finally in temperature 1600 ~ 1700 DEG C of high temperature reheating stoves, calcine 2.5 ~ 3.5h, obtain described prefabricated component.
Another object of the present invention is the mould of protection preparation prefabricated component of the present invention.
Mould of the present invention comprises the upper die and lower die being bolted and can freely fastening, described counterdie is rectangular-shaped upper shed cavity, described patrix be bottom opening and with the rectangular-shaped cavity of described counterdie mating shapes, the top of described patrix is provided with three right cylinders for the formation of prefabricated component cylindrical bore.
(3) beneficial effect
The prefabricated component of measurement dry type ramming material of the present invention adopts mullite to be raw material, produces, the size conforms national standard of producing, measure more accurate with casting.Compare in the method for sintered magnesia brick surface punching with traditional, method difficulty of the present invention is little, is shaped desirable.
Accompanying drawing explanation
Fig. 1 is the sectional view of prefabricated component of the present invention;
Fig. 2 is the vertical view of prefabricated component of the present invention;
Fig. 3 is the sectional view of prefabricated-member mould of the present invention;
Fig. 4 is the vertical view of prefabricated-member mould of the present invention;
In figure 1, patrix; 2, counterdie; 3, bolt; 4, right cylinder; 5, cylindrical bore.
Embodiment
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
The present embodiment relates to a kind of prefabricated component measuring dry type ramming material compressive strength, and its raw material is:
Mullite particle 65kg, mullite fine powder 10kg, silicon powder 4kg, alumina powder 10kg, additive 0.3kg, described additive is trimerization and JG-2.
Wherein, do not come particle volume density>=2.5g/cm
3, Al
2o
3massfraction be 72%, SiO
2massfraction≤1% of quality 20% ~ 40%, CaO;
Described mullite particle is particle diameter 8 ~ 5mm, 5 ~ 3mm, the particle of 3 ~ 1mm and below 1mm mixes by weight 11 ~ 15:15 ~ 20:19 ~ 22:20 ~ 25;
The Al of mullite fine powder
2o
3be 72%, particle size range is 200 orders;
The SiO of silicon powder
2be 97.3%, particle diameter is 5 microns;
The Al of alumina powder
2o
3be 98.5%, particle diameter is 1 micron.
Utilize formula y=100 (d/D)
qcarry out best particle size gradation, wherein, d is grain graininess; D is Particles at Critical granularity; Q is size-grade distribution coefficient, and y is a certain grade (d) less-than cumulation per-cent, and q value gets 0.26.
Prefabricated component rectangular parallelepiped prepared by the present embodiment, it is of a size of (230 × 115 × 65) mm, being uniformly distributed with three diameters is thereon 50mm, and height is the cylindrical hole 5 of 50mm.(its sectional view and vertical view are as Fig. 1 and Fig. 2)
Embodiment 2
The present embodiment relates to a kind of prefabricated component measuring dry type ramming material compressive strength, and its raw material is:
Mullite particle 72kg, mullite fine powder 12kg, silicon powder 5kg, alumina powder 12kg, additive 0.5kg, described additive is trimerization and JG-2.
Roughly the same embodiment 1 is identical for the kind of raw material described in the present embodiment.
The q value of the present embodiment prefabricated component raw material gets 0.3;
Prefabricated component prepared by the present embodiment is rectangular parallelepiped, it is of a size of (230 × 115 × 65) mm, and being uniformly distributed with three diameters is thereon 50mm, and height is the cylindrical hole 5 of 50mm.
Embodiment 3
The present embodiment relates to a kind of prefabricated component measuring dry type ramming material compressive strength, and its raw material is:
Al
2o
3content is the mullite particle 75kg of 72%, mullite fine powder 15kg, silicon powder 7kg, alumina powder 15kg, additive 0.7kg, and described additive is trimerization and JG-2.
Roughly the same embodiment 1 is identical for the kind of raw material described in the present embodiment.
The q value of the present embodiment prefabricated component raw material gets 0.32.
Prefabricated component prepared by the present embodiment is rectangular parallelepiped, it is of a size of (230 × 115 × 65) mm, and being uniformly distributed with three diameters is thereon 50mm, and height is the cylindrical hole 5 of 50mm.
Embodiment 4
The present embodiment relates to the preparation method of prefabricated component described in claim 1, comprises the steps:
1) by load weighted mullite particle, mullite fine powder, silicon powder and alumina powder and additive are poured in forced stirrer, stir 1 ~ 2 minute, add the clean tap water that weight ratio is 4 ~ 5%, stir 3 ~ 5 minutes, obtain mould material;
2) described mould material is injected mould, vibrating forming, obtains the prefabricated component of casting complete;
3) by the prefabricated component of described casting complete natural curing 24h in a mold, the demoulding, then maintenance 24h in the maintaining box of ambient moisture about 95%, put into after 100 ~ 120 DEG C of baking ovens toast 24h, calcine 1650 DEG C × 3h in final high temperature reheating stove, obtain prefabricated component.
Embodiment 5
Described in embodiment 2 ~ 3, the preparation method of prefabricated component, comprises the steps:
1) will weigh mullite particle, mullite fine powder, micro mist and additive are poured in forced stirrer, stir 1 ~ 2 minute, add the clean tap water that weight ratio is 4 ~ 5%, stir 3 ~ 5 minutes, obtain mould material;
2) described mould material is injected mould, vibrating forming, obtains the prefabricated component of casting complete;
3) by the prefabricated component of described casting complete natural curing 22 ~ 26h in a mold, the demoulding, then maintenance 24h in the maintaining box of ambient moisture about 90 ~ 98%, after putting into 100 ~ 120 DEG C of baking oven baking 22 ~ 26h, calcine (1600 ~ 1700 DEG C) × (2.5 ~ 3.5) h in final high temperature reheating stove, obtain prefabricated component.
Embodiment 6
What the present embodiment related to prefabricated component of the present invention prepares mould, and its structure as shown in Figure 3 and Figure 4.This mould comprises fixes the patrix 1 and counterdie 2 that can freely fasten by bolt 3.Wherein, counterdie 2 is rectangular-shaped upper shed cavity, patrix 1 be bottom opening and with the rectangular-shaped cavity of counterdie 2 mating shapes.In addition, the top of patrix 1 is provided with three right cylinders 4 for the formation of prefabricated component cylindrical bore 5.
Although above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, all belong to the scope of protection of present invention.
Claims (10)
1. one kind for detecting the prefabricated component of dry type ramming material compressive strength, it is characterized in that, the raw material comprising following weight part is prepared from: mullite particle 65 ~ 75 parts, mullite fine powder 10 ~ 15 parts, silicon powder 4 ~ 7 parts, alumina powder 10 ~ 15 parts and additive 0.3 ~ 0.7 part.
2. prefabricated component according to claim 1, is characterized in that, the volume density>=2.5g/cm of described mullite particle
3, preferably, Al
2o
3massfraction be 50% ~ 77%, SiO
2massfraction be massfraction≤1% of 20% ~ 40%, CaO.
3. prefabricated component according to claim 1 and 2, it is characterized in that, the particle size range of described mullite particle is below 8mm, and preferably the particle of particle diameter 8 ~ 5mm, 5 ~ 3mm, 3 ~ 1mm and below 1mm mixes by weight 11 ~ 15:15 ~ 20:19 ~ 22:20 ~ 25.
4. the prefabricated component according to any one of claim 1-3, is characterized in that, the particle diameter of described mullite fine powder is 200 orders, preferably wherein Al
2o
3content is 62% ~ 75%.
5. the prefabricated component according to any one of claim 1-3, is characterized in that, the particle diameter of described silicon powder is 5 microns, preferably wherein SiO
2content is greater than 97%.
6. the prefabricated component according to any one of claim 1-3, is characterized in that, the particle size range of described alumina powder is 1 micron, preferably wherein Al
2o
3content is greater than 98%.
7. the prefabricated component according to any one of claim 1-3, is characterized in that, described additive is trimerization and JG-2.
8. the prefabricated component according to any one of claim 1-3, is characterized in that, described prefabricated component is rectangular-shaped, and it is 50 ± 2mm that described prefabricated component is provided with equally distributed 3 diameters, and height is the cylindrical bore of 50 ± 2mm.
9. the preparation method of the prefabricated component described in any one of claim 1 ~ 8, is characterized in that, comprises the steps:
1) by load weighted alumina powder, mullite particle, mullite fine powder, silicon powder and additive are poured in forced stirrer and are stirred, and add the clean tap water that weight ratio is 4 ~ 5%, stir 3 ~ 5 minutes, obtain mould material;
2) described mould material is injected mould, vibrating forming, obtains the prefabricated component of casting complete;
3) by the demoulding after the prefabricated component of described casting complete in a mold natural curing, then secondary maintenance in maintaining box, through baking, calcines to obtain described prefabricated component;
Preferred described step 3) be specially: by the prefabricated component of described casting complete natural curing 22 ~ 26h in a mold, the demoulding, then maintenance 22 ~ 26h in the maintaining box of ambient moisture about 90 ~ 98%, after putting into 100 ~ 120 DEG C of baking oven baking 22 ~ 26h, finally in temperature 1600 ~ 1700 DEG C of high temperature reheating stoves, calcine 2.5 ~ 3.5h, obtain described prefabricated component.
10. prepare the mould of prefabricated component described in any one of claim 1 ~ 8 for one kind, described mould comprises the upper die and lower die being bolted and can freely fastening, described counterdie is rectangular-shaped upper shed cavity, described patrix be bottom opening and with the rectangular-shaped cavity of described counterdie mating shapes, the top of described patrix is provided with three right cylinders for the formation of prefabricated component cylindrical bore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510632868.8A CN105272282A (en) | 2015-09-29 | 2015-09-29 | Prefabticated member for detecting compressive strength of dry ramming material, and making method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510632868.8A CN105272282A (en) | 2015-09-29 | 2015-09-29 | Prefabticated member for detecting compressive strength of dry ramming material, and making method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105272282A true CN105272282A (en) | 2016-01-27 |
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|---|---|---|---|
| CN201510632868.8A Pending CN105272282A (en) | 2015-09-29 | 2015-09-29 | Prefabticated member for detecting compressive strength of dry ramming material, and making method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2381457Y (en) * | 1999-06-08 | 2000-06-07 | 朱其聪 | Multifunctional cement brick mould |
| JP2004050196A (en) * | 2002-07-16 | 2004-02-19 | Kurosaki Harima Corp | High-heat resistant impact property sliding nozzle plate brick |
| CN101580401A (en) * | 2009-06-18 | 2009-11-18 | 安徽宁火新材料有限公司 | High-strength wearable casting material |
| CN103264431A (en) * | 2013-04-27 | 2013-08-28 | 李峰 | Autoclaved aerated concrete masonry block and production method thereof |
| CN104326755A (en) * | 2014-10-11 | 2015-02-04 | 河南中原特种耐火材料有限公司 | Low-thermal-conductivity mullite tin bath combined top cover brick |
-
2015
- 2015-09-29 CN CN201510632868.8A patent/CN105272282A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2381457Y (en) * | 1999-06-08 | 2000-06-07 | 朱其聪 | Multifunctional cement brick mould |
| JP2004050196A (en) * | 2002-07-16 | 2004-02-19 | Kurosaki Harima Corp | High-heat resistant impact property sliding nozzle plate brick |
| CN101580401A (en) * | 2009-06-18 | 2009-11-18 | 安徽宁火新材料有限公司 | High-strength wearable casting material |
| CN103264431A (en) * | 2013-04-27 | 2013-08-28 | 李峰 | Autoclaved aerated concrete masonry block and production method thereof |
| CN104326755A (en) * | 2014-10-11 | 2015-02-04 | 河南中原特种耐火材料有限公司 | Low-thermal-conductivity mullite tin bath combined top cover brick |
Non-Patent Citations (2)
| Title |
|---|
| 江东亮等: "《无机非金属材料手册（下）》", 31 July 2009, 化学工业出版社 * |
| 王诚训等: "《耐火浇注料及其技术发展》", 30 April 2015, 冶金工业出版社 * |
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Application publication date: 20160127 |
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