CN103058684A - Medium-density spinel brick used for rotary kiln and preparation method thereof - Google Patents
Medium-density spinel brick used for rotary kiln and preparation method thereof Download PDFInfo
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- CN103058684A CN103058684A CN2013100291233A CN201310029123A CN103058684A CN 103058684 A CN103058684 A CN 103058684A CN 2013100291233 A CN2013100291233 A CN 2013100291233A CN 201310029123 A CN201310029123 A CN 201310029123A CN 103058684 A CN103058684 A CN 103058684A
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Abstract
The invention discloses a medium-density spinel brick used for a rotary kiln and a preparation method thereof. The density of a product is reduced by introducing lightweight aggregate into a high-density spinel brick, and the medium-density spinel brick adopts the following raw materials in parts by weight: 25-65 parts of 0-5mm magnesia, 11-25 parts of magnesia powder of not more than 180 meshes, 9-22 parts of spinel powder of not more than 180 meshes, 10-30 parts of lightweight aggregate and 4-8 parts of additional binding agent. The preparation process comprises the steps of mixing, shaping, drying, firing and the like. Compared with a high-density spinel brick, the medium-density spinel brick prepared by the invention has the advantages of low heat conductivity, excellent thermal shock resistance, light weight and the like; and during the using process, the radiation loss can be reduced, the consumption of energy and equipment power can be reduced, and the effects of improving a working environment, saving energy and reducing emission can be realized.
Description
Technical field
The present invention relates to density spinel brick and preparation method thereof in a kind of rotary kiln usefulness, belong to technical field of refractory materials.
Background technology
Along with the continuous appearance of manufacture of cement new technology, the manufacture of cement main process equipment increases output, improves quality, saves energy and reduce the cost, reduces cost becomes increases benefit in the production management key to the maximization future development.Existing refractory brick and insulating brick are single structure mostly, need during use the brick of various performances is used, if on relatively fixed equipment, such as tunnel furnace, down-draft kiln, are used and can both meet the demands; But on the equipment of some relative movement, such as rotary kiln, be used and just be difficult to meet the demands.Some producers and research unit are studied this and tackle key problems, and have released the composite brick that some heavys and lightweight combine, but because lightweight working lining structural strength is excessively low, and can't satisfy service requirements and do not promote on a large scale, or take the heavy brick as main.Take present existing rotary kiln as example, front transitional zone uses spinel brick, clinkering zone to use magnesia chrome brick, since the thermal conductivity of the magnesia chrome brick that spinel brick and clinkering zone use large (〉=2.7W/mK) so that kiln cylinder body outside wall temperature higher (about about 380 ℃, can reach 420 ℃ during high temperature greatly).The cylinder body outer wall temperature is higher, the kiln cylinder body heat radiation is increased, thereby strengthen heat consumption of clinker, causes that the grog unit cost increases; Very easily make on the other hand the cylindrical shell expanded by heating, cause kiln middle part support roller Wa Wendu to raise, especially using the normal operation to equipment of later stage or summer to bring larger hidden danger.Cylindrical shell is the excessively heat gain damage probability of mechanical means, accelerated barrel distortion, and barrel distortion has accelerated the physical disturbance of liner, consequently falls brick, stop kiln, affects the operation factor of cement rotary kiln.If therefore can use at this position composite brick fire-resistant, heat insulation dual-use function that the barrel temperature at transitional zone position is reduced, reduce heat lost by radiation, and be conducive to maintenance of the equipment, improve operation rate.Although use heavy lightweight stratiform composite brick can obviously reduce heat lost by radiation, but the bonding strength between heavy layer and the light layer and Performance Match are insoluble problems always, the present invention reduces product density by introduce aglite in the high-density spinel brick, then can avoid this problem to produce, and can reach same energy-saving effect.
Summary of the invention
For the deficiency that above-mentioned prior art exists, the purpose of this invention is to provide density spinel brick in a kind of rotary kiln usefulness, it has, and thermal conductivity is low, and thermal shock resistance is good, and corrosion resistance is strong, lightweight advantage.The invention also discloses the preparation method of density spinel brick in this rotary kiln usefulness.
To achieve these goals, the technical solution adopted in the present invention is: density spinel brick during rotary kiln is used includes particulate material, powder, wedding agent and aglite in its component.
The density of density spinel brick was 2.0 ~ 2.5 g/cm during described rotary kiln was used
3
Described aglite is at least a in magnesium oxide hollow ball, Magnalium hollow ball, magnesium chromium hollow ball, magnesium calcium hollow ball, the magnesium titanium hollow ball.
The granularity specification of described aglite is at least a among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm.
Described particulate material includes: the magnesia of 0 ~ 5mm.
Described powder includes: be not more than 180 purpose spinel powders, be not more than 180 purpose magnesia powders.
Described wedding agent is a kind of in industrial lignin sulfonic acid salts solution, methocel solution, the yellow starch gum liquation.
In the component of described middle density spinel brick, by weight, include: 25 ~ 65 parts in the magnesia of 0 ~ 5mm, be not more than 11 ~ 25 parts of 180 purpose magnesia powders, be not more than 9 ~ 22 parts of 180 purpose spinel powders, 10 ~ 30 parts of aglites, add 4～8 parts of wedding agents.
Rotary kiln of the present invention with in the advantage that has of density spinel brick be: thermal conductivity is low, thermal shock resistance good, lightweight.The density spinel brick increased aglite and has reduced product density during rotary kiln of the present invention was used in high-density spinel brick component commonly used.Simultaneously because the thermal conductivity of aglite is lower, then make this rotary kiln with in the density spinel brick have lower thermal conductivity.And aglite can with the preferably combination of other components, thereby this rotary kiln with in the thermal shock resistance of density spinel brick better.After tested, the density of density spinel brick was 2.0 ~ 2.5g/cm during this rotary kiln was used
3, 350 ℃ of thermal conductivitys are not more than 1.4W/m.k, all are lower than mean density and the thermal conductivity of high-density spinel brick.And this rotary kiln with in the density spinel brick be not less than 35MPa, can satisfy the needs of actual use.That is: this rotary kiln with in can reduce heat lost by radiation in the use procedure of density spinel brick, reduce the energy and equipment dynamic consumption, play the effect that improves Working environment and energy-saving and emission-reduction.
The preparation method of density spinel brick during rotary kiln of the present invention is used may further comprise the steps successively:
A, batching: after particulate material and aglite and wedding agent mixed in proportion, it was even to add in proportion powder stirring again;
B, moulding: the equal refining that steps A is formed adds in the mould mechanical pressing;
C, drying and burn till: the base substrate that step B is formed is after 80～150oC oven dry, and loading of kiln forms finished product in 1550 ~ 1720oC insulation, 6～12h.
Among the described step B during mechanical pressing breakage rate of aglite be not more than 15%.
The method guaranteed preferably this rotary kiln with in the mass parameter of density spinel brick, and processing parameter, method, equipment all have no special requirements, and is easy to realize.
Embodiment
The following stated only is preferred embodiment of the present invention, does not therefore limit protection scope of the present invention.
In following examples: aglite is at least a in magnesium oxide hollow ball, Magnalium hollow ball, magnesium chromium hollow ball, magnesium calcium hollow ball, the magnesium titanium hollow ball.Particulate material includes: the magnesia of 0 ~ 5mm.Powder includes: be not more than 180 purpose spinel powders, be not more than 180 purpose magnesia powders.Wedding agent is a kind of in industrial lignin sulfonic acid salts solution, methocel solution, the yellow starch gum liquation.Make the density of density spinel brick in this rotary kiln usefulness be by adding aglite and mechanical pressing: 2.0 ~ 2.5g/cm
3
Embodiment 1
The raw material that adopts in the present embodiment and weight part are: 65 parts in the magnesia of 0 ~ 5mm, be not more than 11 parts of 180 purpose magnesia powders, be not more than 14 parts of 180 purpose spinel powders, 10 parts of 0 ~ 5mm magnesium oxide hollow balls, add 4 parts of wedding agent industry lignin sulfonic acid salts solutions.
The preparation method of density spinel brick during rotary kiln is used may further comprise the steps successively:
A, batching: after particulate material and aglite and wedding agent mixed in proportion, it was even to add in proportion powder stirring again;
B, moulding: the equal refining that steps A is formed adds in the mould, and vibrating forming is base substrate on the vibrations press, and vibrations pressure is 30 tons, and product density is 2.5g/cm
3, hollow ball percentage of damage 10%;
C, drying and burn till: the base substrate that step B is formed is after the 80oC oven dry, and loading of kiln forms finished product in 1550oC insulation 12h.
The granularity of magnesium oxide hollow ball also can be a kind of among 0 ~ 1mm, the 0 ~ 3mm in the present embodiment, or granularity is at least 2 kinds arbitrary combination among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm.
Embodiment 2
The raw material that adopts in the present embodiment and weight part are: 25 parts in the magnesia of 0 ~ 5mm, be not more than 25 parts of 180 purpose magnesia powders, be not more than 20 parts of 180 purpose spinel powders, 15 parts of 0～1mm Magnalium hollow balls, 15 parts of 0～3mm magnesium chromium hollow balls, add 8 parts of wedding agent methocel solutions.
The preparation method of density spinel brick during rotary kiln is used may further comprise the steps successively:
A, batching: after particulate material and aglite and wedding agent mixed in proportion, it was even to add in proportion powder stirring again;
B, moulding: the equal refining that steps A is formed adds in the mould, adopts 300 tons of press impact briquettings, and the control stroke keeps product size to fix, and it is 2.0g/cm that product reaches density
3, the aglite percentage of damage is 8%;
C, drying and burn till: the base substrate that step B is formed is after the 150oC oven dry, and loading of kiln forms finished product in 1720oC insulation 6h.
Embodiment 3
The raw material that adopts in the present embodiment and weight part are: 47 parts in the magnesia of 0 ~ 5mm, be not more than 23 parts of 180 purpose magnesia powders, be not more than 9 parts of 180 purpose spinel powders, 21 parts of 0 ~ 3mm magnesium calcium hollow balls, add 6 parts of wedding agent yellow starch gum liquations.
The preparation method of density spinel brick during rotary kiln is used may further comprise the steps successively:
A, batching: after particulate material and aglite and wedding agent mixed in proportion, it was even to add in proportion powder stirring again;
B, moulding: the equal refining that steps A is formed adds in the fixing mould of size, and vibrating forming is base substrate on the vibrations press, and vibrations pressure is 30 tons, and product density is 2.2g/cm
3, the aglite percentage of damage is 11%;
C, drying and burn till: the base substrate that step B is formed is after the 110oC oven dry, and loading of kiln forms finished product in 1650oC insulation 8h.
The granularity of magnesium calcium hollow ball also can be a kind of among 0 ~ 1mm, the 0 ~ 5mm in the present embodiment, or granularity is at least 2 kinds arbitrary combination among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm.
Embodiment 4
The raw material that adopts in the present embodiment and weight part are: 50 parts in the magnesia of 0 ~ 5mm, be not more than 13 parts of 180 purpose magnesia powders, be not more than 22 parts of 180 purpose spinel powders, 15 parts of 0 ~ 1mm magnesium titanium hollow balls, add 5 parts of wedding agent yellow starch gum liquations.
The preparation method of density spinel brick during rotary kiln is used may further comprise the steps successively:
A, batching: after particulate material and aglite and wedding agent mixed in proportion, it was even to add in proportion powder stirring again;
B, moulding: the equal refining that steps A is formed adds in the mould, adopts the moulding of 150 tons of press oil pressure, and the control stroke keeps product size to fix, and product density is 2.3g/cm
3, the aglite percentage of damage is 15%;
C, drying and burn till: the base substrate that step B is formed is after the 80oC oven dry, and loading of kiln forms finished product in 1600oC insulation 10h.
The granularity of magnesium titanium hollow ball also can be a kind of among 0 ~ 3mm, the 0 ~ 5mm in the present embodiment, or granularity is at least 2 kinds arbitrary combination among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm.
Embodiment 5
The raw material that adopts in the present embodiment and weight part are: 40 parts in the magnesia of 0 ~ 5mm, be not more than 19 parts of 180 purpose magnesia powders, be not more than 16 parts of 180 purpose spinel powders, 25 parts of 0 ~ 3mm magnesium calcium hollow balls, add 6 parts of wedding agent yellow starch gum liquations.
The preparation method of density spinel brick during rotary kiln is used may further comprise the steps successively:
A, batching: after particulate material and aglite and wedding agent mixed in proportion, it was even to add in proportion powder stirring again;
B, moulding: the equal refining that steps A is formed adds in the fixing mould of size, and vibrating forming is base substrate on the vibrations press, and vibrations pressure is 30 tons, and product density is 2.2g/cm
3, the aglite percentage of damage is 12%;
C, drying and burn till: the base substrate that step B is formed is after the 100oC oven dry, and loading of kiln forms finished product in 1700oC insulation 8h.
Embodiment 6
Only be with the difference of embodiment 1: the magnesium oxide hollow ball replaces with Magnalium hollow ball.
Embodiment 7
Only be with the difference of embodiment 3: magnesium calcium hollow ball replaces with magnesium chromium hollow ball.
Embodiment 8
Only be with the difference of embodiment 4: magnesium titanium hollow ball is with at least two kinds of replacements in magnesium oxide hollow ball, Magnalium hollow ball, magnesium chromium hollow ball, magnesium calcium hollow ball, the magnesium titanium hollow ball, and their granularity take among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm any one or multiple.
Get above embodiment gained finished product and carry out the normal experiment analysis, the parameter comparison of each end properties parameter and high-density spinel brick sees the following form:
Among the present invention prepared rotary kiln with in the performance comparison of density spinel brick and high-density spinel brick commonly used
| ? | The high-density spinel brick | Density spinel brick in this |
| Volume density (g/cm 3） | 2.8~3.0 | 2.0~2.5 |
| Compressive strength (MPa) | ≥45 | ≥35 |
| 350 ℃ of thermal conductivitys (W/m.k) | 1.4~1.8 | 1.0~1.4 |
| 1100 ℃ of water-cooleds (inferior) | ≥8 | ≥10 |
| Maximum operation (service) temperature (℃) | 1700 | 1700 |
As seen from the above table, the density spinel brick had certain advantage at density, 350 ℃ of thermal conductivitys, 1100 ℃ of aspects such as water-cooled number of times of tolerance during the prepared rotary kiln of the present invention was used for high-density spinel brick commonly used.Reached service requirements in compressive strength and maximum operation (service) temperature.
Claims (10)
1. density spinel brick during rotary kiln is used includes particulate material, powder, wedding agent and aglite in its component.
2. density spinel brick during rotary kiln according to claim 1 is used is characterized in that: the density of density spinel brick was 2.0 ~ 2.5 g/cm during described rotary kiln was used
3
Rotary kiln according to claim 2 with in the density spinel brick, it is characterized in that: described aglite is at least a in magnesium oxide hollow ball, Magnalium hollow ball, magnesium chromium hollow ball, magnesium calcium hollow ball, the magnesium titanium hollow ball.
Rotary kiln according to claim 3 with in the density spinel brick, it is characterized in that: the granularity specification of described aglite is at least a among 0 ~ 1mm, 0 ~ 3mm, the 0 ~ 5mm.
5. density spinel brick during rotary kiln according to claim 4 is used, it is characterized in that: described particulate material includes: the magnesia of 0 ~ 5mm.
6. density spinel brick during rotary kiln according to claim 5 is used, it is characterized in that: described powder includes: be not more than 180 purpose spinel powders, be not more than 180 purpose magnesia powders.
Rotary kiln according to claim 6 with in the density spinel brick, it is characterized in that: described wedding agent is a kind of in industrial lignin sulfonic acid salts solution, methocel solution, the yellow starch gum liquation.
8. density spinel brick during rotary kiln according to claim 7 is used, it is characterized in that: in the component of described middle density spinel brick, by weight, include: 25 ~ 65 parts in the magnesia of 0 ~ 5mm, be not more than 11 ~ 25 parts of 180 purpose magnesia powders, be not more than 9 ~ 22 parts of 180 purpose spinel powders, 10 ~ 30 parts of aglites, add 4～8 parts of wedding agents.
According to claim 1 in 8 each described rotary kiln with in the preparation method of density spinel brick, may further comprise the steps successively:
A, batching: after particulate material and aglite and wedding agent mixed in proportion, it was even to add in proportion powder stirring again;
B, moulding: the equal refining that steps A is formed adds in the mould mechanical pressing;
C, drying and burn till: the base substrate that step B is formed is after 80～150oC oven dry, and loading of kiln forms finished product in 1550 ~ 1720oC insulation, 6～12h.
Rotary kiln according to claim 9 with in the preparation method of density spinel brick, it is characterized in that: among the described step B during mechanical pressing breakage rate of aglite be not more than 15%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105130471A (en) * | 2015-09-09 | 2015-12-09 | 郑州瑞泰耐火科技有限公司 | Magnesium-aluminum-iron spinel brick and preparation method thereof |
| CN113443898A (en) * | 2021-06-17 | 2021-09-28 | 鞍山市奥鞍耐火材料有限责任公司 | Low-thermal-conductivity spinel refractory homogeneous brick and preparation method and application thereof |
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| JP2001302363A (en) * | 2000-04-26 | 2001-10-31 | Yotai Refractories Co Ltd | Magnesia-alumina-based spinel refractory |
| CN101712554A (en) * | 2009-10-28 | 2010-05-26 | 郑州真金耐火材料有限责任公司 | Production method of magnesium-aluminum spinel bricks |
| CN101863673A (en) * | 2010-06-07 | 2010-10-20 | 长兴锅炉耐火器材厂 | Magnesia-alumina spinel structure heat insulation integral composite brick and preparation method thereof |
| CN102285807A (en) * | 2011-06-06 | 2011-12-21 | 浙江大学 | Magnesium-spinel-zirconium structure and thermal insulation integrated composite brick and preparation method thereof |
-
2013
- 2013-01-25 CN CN2013100291233A patent/CN103058684A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001302363A (en) * | 2000-04-26 | 2001-10-31 | Yotai Refractories Co Ltd | Magnesia-alumina-based spinel refractory |
| CN101712554A (en) * | 2009-10-28 | 2010-05-26 | 郑州真金耐火材料有限责任公司 | Production method of magnesium-aluminum spinel bricks |
| CN101863673A (en) * | 2010-06-07 | 2010-10-20 | 长兴锅炉耐火器材厂 | Magnesia-alumina spinel structure heat insulation integral composite brick and preparation method thereof |
| CN102285807A (en) * | 2011-06-06 | 2011-12-21 | 浙江大学 | Magnesium-spinel-zirconium structure and thermal insulation integrated composite brick and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105130471A (en) * | 2015-09-09 | 2015-12-09 | 郑州瑞泰耐火科技有限公司 | Magnesium-aluminum-iron spinel brick and preparation method thereof |
| CN113443898A (en) * | 2021-06-17 | 2021-09-28 | 鞍山市奥鞍耐火材料有限责任公司 | Low-thermal-conductivity spinel refractory homogeneous brick and preparation method and application thereof |
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Application publication date: 20130424 |