CN102320849B - Inorganically bonded magnesia-carbon brick - Google Patents
Inorganically bonded magnesia-carbon brick Download PDFInfo
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- CN102320849B CN102320849B CN 201110247063 CN201110247063A CN102320849B CN 102320849 B CN102320849 B CN 102320849B CN 201110247063 CN201110247063 CN 201110247063 CN 201110247063 A CN201110247063 A CN 201110247063A CN 102320849 B CN102320849 B CN 102320849B
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Abstract
Belonging to the technical field of refractory material preparation, the invention relates to an inorganically bonded magnesia-carbon brick, specifically an environment friendly magnesia-carbon brick. The brick of the invention is prepared by the main components of magnesia and carbon, additionally with 2.2-4 parts of lime slurry and 0.1-0.5 part of silica fume, and 0-5 parts of antioxidant can also be added. The brick is prepared by the steps of: mixing the magnesia, carbon, lime slurry, silica fume and antioxidant, then placing them in a die, conducting compression moulding with a pressing machine of high tonnage; putting a moulded green brick into a kiln channel for baking, and taking the brick out of the kiln channel, thus obtaining a finished product of inorganically bonded magnesia-carbon brick. Compared with original technologies, the magnesia-carbon brick produced in the invention saves energy and manpower, reduces pollutant discharge. And the inorganic binding agent employed in the production process of the brick of the invention does not volatilize any toxic gas.
Description
Technical field
The present invention is a kind of inorganic in conjunction with magnesia carbon brick, and specifically the environment friendly magnesium carbon brick belongs to the refractory materials preparing technical field.
Background technology
Magnesian fusing point is 2800 ℃, has very strong heat-resisting ability, but its heat-shock resistance, slag penetration resistance are poor.Carbon materials take graphite as representative also has very strong heat-resisting ability, and its thermal expansivity is low, heat-shock resistance is very excellent, at high temperature be difficult for infiltrating with molten steel, slag, the two is compound according to a certain percentage, by the wedding agent combination, form a kind of refractory materials-magnesia carbon brick of good combination property.Magnesia carbon brick is mainly used in making steel refractory materials, such as converter, steel-smelting electric furnace, ladle etc.Because promoting the use of of magnesia carbon brick improved life-span and the security of lining of steel-smelting furnace, reduced the refractory wear in the steelmaking process, promoted the raising of Iron And Steel Industry production capacity.
Wedding agent is the key component of magnesia carbon brick, and magnesia carbon brick now adopts the organic bond combination usually, and organic bond mainly is phenolic resin binder and pitch wedding agent.All containing poisonous and hazardous material in these two kinds of wedding agents, is inevitable contaminate environment all in the production and application process of wedding agent or magnesia carbon brick.
Summary of the invention
The object of the present invention is to provide a kind of magnesia carbon brick of inorganic combination, this magnesia carbon brick uses the inorganic bonding agent combination, the environmental pollution that can avoid organic bond to produce.
According to technical scheme provided by the invention, inorganic preparation method in conjunction with magnesia carbon brick, formula rate is counted by weight, and step is as follows:
(1) preparation of lime white: get 2-4 part water and 1 part of unslaked lime or slaked lime and add in the container, leave standstill after the mixing above 48h, the upper strata clear solution is liming, and lower floor's emulsion is lime white;
(2) mixing: adding 80-99 part magnesia, 1-20 part carbon element, 2.2-4 part lime white, silicon ash 0.1-0.5 part mix in mixing machine and obtain mixing pug in the mixing roll;
(3) extrusion forming: put into press die mixing pug, the 150-250MPa extrusion forming becomes adobe;
(4) baking: the kiln road is put in the adobe after the moulding toasted, pass into reducing gas N
2Or CO, storing temperature is 190-250 ℃, it is inorganic in conjunction with magnesia carbon brick namely to get product.
In mixing roll, add again in the step (2) greater than 0 less than 5 parts antioxidant;
Described antioxidant is: one or more in aluminium powder, silica flour, silicon carbide, norbide, silicon nitride or the Sialon.
The ratio of lime is 25%-50% in the described lime white.
Described carbon element is one or more in graphite, carbon black and the asphalt powder.
Described inorganic bonding agent is the combination of lime white and silicon ash.Lime white is the suspension liquid that unslaked lime or slaked lime form in water.The silicon ash be iron alloy when smelting duriron and industrial silicon (Pure Silicon Metal), produce the very strong SiO of a large amount of volatility and Si gas in the ore-smelting furnace, form with the rapid oxidation condensation of air precipitation behind the gaseous emission, it is the by product during large industry is smelted.
The effect of magnesia is high thermal resistance, the resistance to slag corrosion that keeps magnesia carbon brick.
The effect of carbon element is to keep inorganic hot strength in conjunction with magnesia carbon brick, heat-shock resistance, slag penetration resistance.
The silicon ash generates silica gel and plays keying action at the high-temperature steam Water Under.The silicon ash can also suppress the aquation of magnesia in the magnesia carbon brick.
The lime white that forms after the unslaked lime slaking is the colloid of spherical fine particle high dispersing, and the surface has reduced the frictional force between the particle with thicker moisture film, has good plasticity.Calcium hydroxide and silicon ash produce the bonding force that is similar to calcium silicate cement under hot environment.Present most kilns road all be to heat by burning carbonaceous fuel.Contain carbonic acid gas in the stack gas wherein.Carbonic acid gas and calcium hydroxide can react generation calcium carbonate.Calcium carbonate has higher intensity, can improve the normal temperature strength of magnesia carbon brick.
Calcium hydroxide is produced calcium oxide behind pyrolytic decomposition, improve the calcium oxide ratio of magnesia carbon brick matrix part, can improve slag penetration resistance and the heat-shock resistance of magnesia carbon brick, also is conducive to reduce the inclusion in the steel.
Can also add the Partial Antioxidation agent and stop that carbon element and non-oxidized substance are oxidized.Antioxidant can with oxygen reaction, stop up pore, make the matrix of magnesia carbon brick fine and close, the protection carbon element is not oxidized.The antioxidant such as aluminium powder, silica flour also can the part aquation produce keying action in bake process.The lime borate liquid that at high temperature can generate of calcium oxide and boracic antioxidant covers the magnesia carbon brick surface, intercepts carbon element and oxygen, improves antioxidant effect.
Beneficial effect of the present invention: compare original technology, the magnesia carbon brick that the present invention produces has been saved the energy and manpower, has reduced the discharging of pollutent, and its employed inorganic bonding agent in the production and application process can not volatilize toxic gas.
Embodiment
Following Example formulations ratio is by weight:
Embodiment 1
(1) preparation of lime white: get 3 parts of water and 1 part of unslaked lime or slaked lime and add in the container, leave standstill after the mixing above 48h, upper transparent solution is liming, and the emulsion of bottom is lime white;
(2) mixing: as to get 80 parts of magnesia, be divided into magnesia particle and magnesia powder; Add magnesia particle, 4 parts of lime whites, 0.5 part of silicon ash in the mixing roll, mixing 3min adds 19 parts of mixing 5min of graphite again, adds at last magnesia powder, 1 part of mesophase pitch powder and 0.5 part of norbide and mixes and obtain mixing pug;
(3) extrusion forming: put into press die mixing pug, the 250MPa extrusion forming becomes adobe;
(4) baking: the kiln road is put in the adobe after the moulding toasted, pass into reducing gas, the highest storing temperature is 250 ℃, and it is inorganic in conjunction with magnesia carbon brick namely to get product.
Products obtained therefrom compressive strength 〉=30MPa.
Embodiment 2
(1) preparation of lime white: get 3 parts of water and 1 part of unslaked lime or slaked lime and add in the container, leave standstill after the mixing above 48h, upper transparent solution is liming, and the emulsion of bottom is lime white;
(2) mixing: get 94 parts of magnesia, granularity is 6 ~ 0mm; Add 94 parts of magnesia, 5 parts of graphite, 1 part of N220 carbon black, 3 parts of lime whites, 0.3 part of silicon ash in the high speed mixing smelting machine, mixing 10min obtains mixing pug;
(3) extrusion forming: put into press die mixing pug, the 200MPa extrusion forming becomes adobe;
(4) baking: the kiln road is put in the adobe after the extrusion forming toasted, pass into reducing gas, the highest storing temperature is 190 ℃, and it is inorganic in conjunction with magnesia carbon brick namely to get product.
Products obtained therefrom compressive strength 〉=35MPa.
Embodiment 3
(1) preparation of lime white: get 3 parts of water and 1 part of unslaked lime or slaked lime and add in the container, leave standstill after the mixing above 48h, upper transparent solution is liming, and the emulsion of bottom is lime white;
(2) mixing: as to get 99 parts of magnesia, be divided into magnesia particle and magnesia powder; Add magnesia particle, 2.2 parts of lime whites, 0.1 part of silicon ash in the mixing roll, mixing 2min adds magnesia powder, 0.5 part of N220 carbon black, 0.5 part of mesophase pitch powder, 5 parts of carborundum powder mixing 20min again and obtains mixing pug;
(3) extrusion forming: put into press die mixing pug, the 150MPa extrusion forming becomes adobe;
(4) baking: the kiln road is put in the adobe after the extrusion forming toasted, pass into reducing gas, storing temperature is 250 ℃, and it is inorganic in conjunction with magnesia carbon brick namely to get product.
Claims (4)
1. inorganic preparation method in conjunction with magnesia carbon brick, it is characterized in that: formula rate is counted by weight, and step is as follows:
(1) preparation of lime white: get 2-4 part water and 1 part of unslaked lime or slaked lime and add in the container, leave standstill after the mixing above 48h, the upper strata clear solution is liming, and lower floor's emulsion is lime white;
(2) mixing: adding 80-99 part magnesia, 1-20 part carbon element, 2.2-4 part lime white, silicon ash 0.1-0.5 part mix in mixing machine and obtain mixing pug in the mixing roll;
(3) extrusion forming: put into press die mixing pug, the 150-250MPa extrusion forming obtains adobe;
(4) baking: the kiln road is put in adobe after the extrusion forming toasted, pass into reducing gas CO, storing temperature is 190-250 ℃, and it is inorganic in conjunction with magnesia carbon brick namely to get product.
2. described inorganic preparation method in conjunction with magnesia carbon brick according to claim 1 is characterized in that: add in mixing roll in the step (2) greater than 0 less than 5 parts antioxidant again;
Described antioxidant is: one or more in aluminium powder, silica flour, silicon carbide, norbide, silicon nitride or the Sialon.
3. described inorganic preparation method in conjunction with magnesia carbon brick according to claim 1, it is characterized in that: the ratio of lime is 25%-50% in the described lime white.
4. described inorganic preparation method in conjunction with magnesia carbon brick according to claim 1, it is characterized in that: described carbon element is one or more in graphite, carbon black and the asphalt powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110247063 CN102320849B (en) | 2011-08-24 | 2011-08-24 | Inorganically bonded magnesia-carbon brick |
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| CN 201110247063 CN102320849B (en) | 2011-08-24 | 2011-08-24 | Inorganically bonded magnesia-carbon brick |
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| CN102320849A CN102320849A (en) | 2012-01-18 |
| CN102320849B true CN102320849B (en) | 2013-01-23 |
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| DE212016000023U1 (en) | 2015-12-16 | 2017-06-08 | Calderys France | Castable refractory compositions comprising zeolite microstructures, and uses thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1412146A (en) * | 2001-10-16 | 2003-04-23 | 同济大学 | Mixed high-performance light concrete and its production process |
| CN100534954C (en) * | 2007-02-09 | 2009-09-02 | 江苏苏嘉集团新材料有限公司 | Non-oxide composite low-carbon magnesia-carbon brick |
| CN101654375B (en) * | 2009-09-24 | 2012-10-31 | 武汉钢铁(集团)公司 | Low-carbon magnesia carbon brick |
| CN101928480B (en) * | 2010-09-07 | 2012-05-23 | 武汉科技大学 | Method for preparing magnesia carbon brick non-aluminum antioxidant coating |
| CN102040391B (en) * | 2010-11-18 | 2012-12-19 | 江苏苏嘉集团新材料有限公司 | Boron iron powder-containing magnesia carbon product |
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