CN101269985A - MgO-CaO series fire resistive material castable and preparing method - Google Patents
MgO-CaO series fire resistive material castable and preparing method Download PDFInfo
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- CN101269985A CN101269985A CNA200810047558XA CN200810047558A CN101269985A CN 101269985 A CN101269985 A CN 101269985A CN A200810047558X A CNA200810047558X A CN A200810047558XA CN 200810047558 A CN200810047558 A CN 200810047558A CN 101269985 A CN101269985 A CN 101269985A
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Abstract
The present invention relates to a casting material of MgO-CaO refractory materials, and a preparation method thereof. In the technical proposal, 45 to 70 weight percent of magnesia-calcia, 25 to 50 weight percent of magnesia, 0.5 to 5 weight percent of sodium hexametaphosphate, 0.5 to 5 weight percent of sodium tripolyphosphate and 0.5 to 4 weight percent of micro silicon powder are mixed; one or both of 0.1 to 4 weight percent of aluminium dihydric phosphate and 0.1 to 4 weight percent of ammonium dihydrogen phosphate are added; 5 to 12 weight percent of water are added into the mixed materials; the mixture is mixed well and molded through vibration; finally, the mixture is maintained at the room temperature for 20 to 60 hours, and then the mould is stripped. In the preparation method, the acid-base reaction of the aluminium dihydric phosphate, the ammonium dihydrogen phosphate and the raw materials of the MgO-CaO is faster than the hydration reaction of the raw materials of the MgO-CaO; and the acid-base reaction generates higher bond strength that takes the leading position and further eliminates or inhibits the tension that results from the cubic dilatation in the hydration reaction. Therefore, the refractory material of the MgO-CaO, which is prepared in the preparation method, has the characteristics of low cost and excellent anti-hydration performances.
Description
Technical field
The invention belongs to MgO-CaO series refractory material technical field.Be specifically related to a kind of MgO-CaO series refractory material mould material and preparation method thereof.
The patent background
The MgO-CaO series refractory material has the refractoriness height, and slag resistance is strong, and thermodynamic property is stable, can catch the Al in the molten steel
2O
3, non-iron contamination such as S, P and purify hot metal, characteristics such as resource exception is abundant are smelted as Clean Steel and to be caused the very big concern of countries in the world with refractory materials.
The defective that the MgO-CaO series refractory material is the most fatal is an aquation very easily.In order to reduce the hydration rate of MgO-CaO series refractory material, Chinese scholars was done many trials and research work.Conclude and get up to mainly contain sintering process, surperficial coating method:
Coating method in surface makes the CaO surface wrap one deck hydration resistance material exactly, makes CaO and water isolated, thereby plays the effect of anti-aquation; Treatment agent organism low temperature easily decomposed down during the surface coated, and adopted CO during carbonating is handled separately
2Treatment effect is not good, is adopting CO
2When handling, feed water vapour, because the easier CaO aquation that makes of water vapour needs strict control CO
2With flow, treatment temp and the time of water vapour, technology is difficult to stablize.
Sintering process is when sintering, adds some additives, makes additive and CaO reaction generate eutectic or sosoloid, or adopting activated sintering technology, acceleration of sintering improves density, reduce the area that contacts with water, perhaps make CaO become the water resisting property mineral, thereby improve hydration resistance.Two step calcining procesies of sintering process are loaded down with trivial details, introduce additive, or high temperature forms eutectic down, influence its high-temperature behavior, or additive cost height, rare earth addition also has certain radioactivity, or forming stable compound, the molten steel that has but lost the free CaO excellence is smelted function.
Though these anti-aquation methods have been improved the hydration resistance of MgO-CaO series refractory material to some extent, but from actual preventing hydration effect, all also do not address this problem well, so, this class material, particularly adopting MgO-CaO is the refractory castable that raw material is made, and is not widely used in ferrous metallurgy and other field.
Summary of the invention
It is mould material and preparation method thereof that task of the present invention provides the MgO-CaO that a kind of cost is low, hydration resistance is good.
For finishing above-mentioned task, the technical solution used in the present invention is: earlier the calcium magnesia sand of 45～70wt%, the magnesia of 25～50wt%, the Sodium hexametaphosphate 99 of 0.5～5wt%, the tripoly phosphate sodium STPP of 0.5～5wt%, the silicon powder of 0.5～4wt% are mixed, add in the ammonium di-hydrogen phosphate of aluminium dihydrogen phosphate, 0.1～4wt% of 0.1～4wt% one or both again, add the water of 5～12wt% of above-mentioned compound then, after vibration moulding, the maintenance demoulding in 20～60 hours at ambient temperature at last stir.
Described calcium magnesia sand is: MgO content is 34～75wt%, and CaO content is 21～62wt%, and volume density is 3.20～3.40g/cm
3, granularity is 8～0mm.
Described magnesia is: MgO content is 88～98wt%, and volume density is 3.20～3.35g/cm
3, grain composition is: granularity is that 5～3mm is that 11～20wt%, 3～1mm are that 13～22wt%, 1～0mm are that 17～25wt%, 0.088～0mm are 35～43wt%.
Owing to adopt technique scheme, it is that raw material, magnesia, wedding agent are mixed and made into mould material that the present invention directly adopts aluminium dihydrogen phosphate, ammonium di-hydrogen phosphate etc. and MgO-CaO, at normal temperatures, because aluminium dihydrogen phosphate, ammonium di-hydrogen phosphate and MgO-CaO are the raw material acid alkali reaction is that the raw material hydration reaction is faster than MgO-CaO, and produce bigger cohesive strength and dominate, thereby offset or suppressed the tension force that volumetric expansion produced that hydration reaction is followed.Therefore, the prepared MgO-CaO series refractory material mould material of the present invention has the advantages that cost is low, hydration resistance is good.
Embodiment
Only the invention will be further described below in conjunction with concrete embodiment, rather than limiting the scope of the invention.
Embodiment 1
A kind of MgO-CaO is mould material and preparation method thereof.Calcium magnesia sand, the magnesia of 40～50wt%, the Sodium hexametaphosphate 99 of 0.5～3wt%, the tripoly phosphate sodium STPP of 1～5wt%, the ammonium di-hydrogen phosphate of 0.1～1wt%, the aluminium dihydrogen phosphate of 1～4wt%, 0.5～3wt% silicon powder with 45～55wt% mixes earlier, add the water of 5～8wt% of above-mentioned compound again, after vibration moulding, maintenance demoulding after 20～40 hours at ambient temperature then stir.
In the present embodiment 1, calcium magnesia sand is: MgO content is 34～49wt%, and CaO content is 47～62wt%, and volume density is 3.32～3.40g/cm
3, granularity is 8～0mm;
The MgO of magnesia is 94～98wt%, and volume density is 3.30～3.35g/cm
3, grain composition is: granularity is that 5～3mm is that 11～20wt%, 3～1mm are that 13～22wt%, 1～0mm are that 17～25wt%, 0.088～0mm are 35～43wt%.
The prepared mould material of present embodiment 1 is after testing: behind the 110 ℃ * 24h, volume density is 3.03g/cm
3, folding strength is 8.8MPa, compressive strength is 78MPa.
Embodiment 2
A kind of MgO-CaO is mould material and preparation method thereof.Calcium magnesia sand, the magnesia of 33～43wt%, the Sodium hexametaphosphate 99 of 1.0～5.0wt%, the tripoly phosphate sodium STPP of 0.5～3wt%, the ammonium di-hydrogen phosphate of 1～3wt%, the aluminium dihydrogen phosphate of 0.1～2wt%, 1～3wt% silicon powder with 52～62wt% mixes earlier, add the water of 7～10wt% of above-mentioned compound again, after vibration moulding, maintenance demoulding after 30～50 hours at ambient temperature then stir.
In the present embodiment 2, calcium magnesia sand that is adopted and magnesia are with embodiment 1.
Prepared mould material is after testing: behind the 110 ℃ * 24h, volume density is 3.01g/cm
3, folding strength is 8.6MPa, compressive strength is 72MPa.
Embodiment 3
A kind of MgO-CaO is mould material and preparation method thereof.Calcium magnesia sand, the magnesia of 25～35wt%, the Sodium hexametaphosphate 99 of 0.5～4wt%, the tripoly phosphate sodium STPP of 0.5～2wt%, the ammonium di-hydrogen phosphate of 0.1～2wt%, the aluminium dihydrogen phosphate of 0.5～3wt%, 1.5～4wt% silicon powder with 60～70wt% mixes earlier, add the water of 9～12wt% of above-mentioned compound again, after vibration moulding, maintenance demoulding after 45～60 hours at ambient temperature then stir.
In the present embodiment 3, calcium magnesia sand that is adopted and magnesia are with embodiment 1
Prepared mould material is after testing: behind the 110 ℃ * 24h, volume density is 3.00g/cm
3, folding strength is 8.1MPa, compressive strength is 67MPa.
Embodiment 4
A kind of MgO-CaO is mould material and preparation method thereof.Calcium magnesia sand, the magnesia of 41～50wt%, the Sodium hexametaphosphate 99 of 0.5～3wt%, the tripoly phosphate sodium STPP of 1～5wt%, the aluminium dihydrogen phosphate of 1～3wt%, 0.5～2.5wt% silicon powder with 45～54wt% mixes earlier, add the water of 5～9wt% of above-mentioned compound again, after vibration moulding, maintenance demoulding after 20～35 hours at ambient temperature then stir.
In the present embodiment 4, calcium magnesia sand is: MgO content is 49～64wt%, and CaO content is 32～47wt%, and volume density is 3.28～3.35g/cm
3, granularity is 8～0mm;
The MgO of magnesia is 90～95wt%, and volume density is 3.28～3.34g/cm
3, grain composition is: granularity is that 5～3mm is that 11～20wt%, 3～1mm are that 13～22wt%, 1～0mm are that 17～25wt%, 0.088～0mm are 35～43wt%.
Prepared mould material is after testing: behind the 110 ℃ * 24h, volume density is 2.95g/cm
3, folding strength is 8.2MPa, compressive strength is 69MPa.
Embodiment 5
A kind of MgO-CaO is mould material and preparation method thereof.Calcium magnesia sand, the magnesia of 34～44wt%, the Sodium hexametaphosphate 99 of 1.0～5wt%, the tripoly phosphate sodium STPP of 0.5～3wt%, the aluminium dihydrogen phosphate of 2～4wt%, 1～3wt% silicon powder with 51～61wt% mixes earlier, add the water of 7～11wt% of above-mentioned compound again, after vibration moulding, maintenance demoulding after 30～55 hours at ambient temperature then stir.
In the present embodiment 5, calcium magnesia sand that is adopted and magnesia are with embodiment 4.
Prepared mould material is after testing: behind the 110 ℃ * 24h, volume density is 3.00g/cm
3, folding strength is 8.0MPa, compressive strength is 71MPa.
Embodiment 6
A kind of MgO-CaO is mould material and preparation method thereof.Calcium magnesia sand, the magnesia of 25～34wt%, the Sodium hexametaphosphate 99 of 0.5～4wt%, the tripoly phosphate sodium STPP of 0.5～2wt%, the aluminium dihydrogen phosphate of 0.1～3wt%, 2～4wt% silicon powder with 61～70wt% mixes earlier, add the water of 8～12wt% of above-mentioned compound again, after vibration moulding, maintenance demoulding after 45～60 hours at ambient temperature then stir.
In the present embodiment 6, calcium magnesia sand that is adopted and magnesia are with embodiment 4
Prepared mould material is after testing: behind the 110 ℃ * 24h, volume density is 2.98g/cm
3, folding strength is 7.9MPa, compressive strength is 69MPa.
Embodiment 7
A kind of MgO-CaO is mould material and preparation method thereof.Calcium magnesia sand, the magnesia of 42～50wt%, the Sodium hexametaphosphate 99 of 0.5～3wt%, the tripoly phosphate sodium STPP of 2～5wt%, the ammonium di-hydrogen phosphate of 1.5～4wt%, 0.5～3wt% silicon powder with 45～53wt% mixes earlier, add the water of 5～8wt% of above-mentioned compound again, after vibration moulding, maintenance demoulding after 20～40 hours at ambient temperature then stir.
In the present embodiment 7, calcium magnesia sand is: MgO content is 64～75wt%, and CaO content is 21～32wt%, and volume density is 3.20～3.30g/cm
3, its granularity is 8～0mm;
The MgO of magnesia is 88～92wt%, and volume density is 3.20～3.30g/cm
3, grain composition is: granularity is that 5～3mm is that 11～20wt%, 3～1mm are that 13～22wt%, 1～0mm are that 17～25wt%, 0.088～0mm are 35～43wt%.
Prepared mould material is after testing: behind the 110 ℃ * 24h, volume density is 2.96g/cm
3, folding strength is 7.6MPa, compressive strength is 68MPa.
Embodiment 8
A kind of MgO-CaO is mould material and preparation method thereof.Earlier with the tripoly phosphate sodium STPP of the Sodium hexametaphosphate 99 of the magnesia of the calcium magnesia sand of 53～62wt%, 33～42wt%, 1.0～5wt%, 0.5～3wt%,, the ammonium di-hydrogen phosphate of 0.1～2.5wt%, 0.5～2.5wt% silicon powder mix, add the water of 8～10wt% of above-mentioned compound again, after vibration moulding, maintenance demoulding after 24～36 hours at ambient temperature then stir.
In the present embodiment 8, calcium magnesia sand that is adopted and magnesia are with embodiment 7.
Prepared mould material is after testing: behind the 110 ℃ * 24h, volume density is 2.94g/cm
3, folding strength is 7.5MPa, compressive strength is 63MPa.
Embodiment 9
A kind of MgO-CaO is mould material and preparation method thereof.Calcium magnesia sand, the magnesia of 25～34wt%, the Sodium hexametaphosphate 99 of 0.5～4wt%, the tripoly phosphate sodium STPP of 0.5～2wt%, the ammonium di-hydrogen phosphate of 1～3wt%, 1～4wt% silicon powder with 60～70wt% mixes earlier, add the water of 7～12wt% of above-mentioned compound again, after vibration moulding, maintenance demoulding after 36～45 hours at ambient temperature then stir.
In the present embodiment 9, calcium magnesia sand that is adopted and magnesia are with embodiment 7.
Prepared mould material is after testing: behind the 110 ℃ * 24h, volume density is 2.98g/cm
3, folding strength is 8.0MPa, compressive strength is 67MPa.
Claims (4)
1, a kind of preparation method of MgO-CaO series refractory material mould material, it is characterized in that earlier the calcium magnesia sand of 45～70wt%, the magnesia of 25～50wt%, the Sodium hexametaphosphate 99 of 0.5～5wt%, the tripoly phosphate sodium STPP of 0.5～5wt%, the silicon powder of 0.5～4wt% being mixed, add in the ammonium di-hydrogen phosphate of aluminium dihydrogen phosphate, 0.1～4wt% of 0.1～4wt% one or both again, add the water of 5～12wt% of above-mentioned compound then, after vibration moulding, the maintenance demoulding in 20～60 hours at ambient temperature at last stir.
2, the preparation method of MgO-CaO series refractory material mould material according to claim 1, it is characterized in that described calcium magnesia sand is: MgO content is 34～75wt%, and CaO content is 21～62wt%, and volume density is 3.20～3.40g/cm
3, granularity is 8～0mm.
3, the preparation method of MgO-CaO series refractory material mould material according to claim 1, it is characterized in that described magnesia is: MgO content is 88～98wt%, volume density is 3.20～3.35g/cm
3, grain composition is: granularity is that 5～3mm is that 11～20wt%, 3～1mm are that 13～22wt%, 1～0mm are that 17～25wt%, 0.088～0mm are 35～43wt%.
4, according to the prepared MgO-CaO series refractory material mould material of preparation method of each described MgO-CaO series refractory material mould material in the claim 1～3.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810047558XA CN101269985A (en) | 2008-04-30 | 2008-04-30 | MgO-CaO series fire resistive material castable and preparing method |
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| CNA200810047558XA CN101269985A (en) | 2008-04-30 | 2008-04-30 | MgO-CaO series fire resistive material castable and preparing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103553678A (en) * | 2013-10-31 | 2014-02-05 | 宁夏天纵泓光余热发电技术有限公司 | Refractory castable for tundish cover |
| CN107200564A (en) * | 2017-06-30 | 2017-09-26 | 张静芬 | A kind of high-strength refractory insulated pouring material |
| CN107235739A (en) * | 2017-06-30 | 2017-10-10 | 长兴泓矿炉料有限公司 | A kind of high CaO content low-loss magnesia-calica refractory castable and preparation method thereof |
-
2008
- 2008-04-30 CN CNA200810047558XA patent/CN101269985A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103553678A (en) * | 2013-10-31 | 2014-02-05 | 宁夏天纵泓光余热发电技术有限公司 | Refractory castable for tundish cover |
| CN103553678B (en) * | 2013-10-31 | 2015-04-08 | 宁夏天纵泓光余热发电技术有限公司 | Refractory castable for tundish cover |
| CN107200564A (en) * | 2017-06-30 | 2017-09-26 | 张静芬 | A kind of high-strength refractory insulated pouring material |
| CN107235739A (en) * | 2017-06-30 | 2017-10-10 | 长兴泓矿炉料有限公司 | A kind of high CaO content low-loss magnesia-calica refractory castable and preparation method thereof |
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Open date: 20080924 |