CN101717266A - Hydrophobic calcium-based magnesium synthetic clinker - Google Patents
Hydrophobic calcium-based magnesium synthetic clinker Download PDFInfo
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- CN101717266A CN101717266A CN200910231306A CN200910231306A CN101717266A CN 101717266 A CN101717266 A CN 101717266A CN 200910231306 A CN200910231306 A CN 200910231306A CN 200910231306 A CN200910231306 A CN 200910231306A CN 101717266 A CN101717266 A CN 101717266A
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- synthetic clinker
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Abstract
The invention relates to a hydrophobic calcium-based magnesium synthetic clinker and belongs to the technical field of fire-retarding materials. The synthetic clinker is prepared by mixing lightly calcined dolomite, lightly calcined magnesium oxide and additives, rolling the mixture for forming, and drying and sintering the formed product, and comprises the following ingredients in percentage by weight: 55 to 65 percent of lightly calcined dolomite, 35 to 45 percent of lightly calcined magnesium oxide, 0.5 to 1 percent of ferricoxide, 0.5 to 1 percent of rare earth oxide and 6 to 7 percent of forming bonder. By adjusting the ingredients and a preparation process, the protection with high density and a covering layer is obtained; and the high volume density of the clinker blocks the permeation passage of water and vapor and the covering layer reduces the contact between lime and water, so the waterproof effect is good and the hydrolysis problem of the CaO is solved. The synthetic clinker has high thermal shock stability, corrosion resistance, erosion resistance and high temperature strength and is applicable to brick making by using various bonders. Particularly, the magnesia-calcium bricks produced by using the material can be used in burnt belts in cement kilns in place of magnesia-chrome brick stones. The synthetic clinker is an environmentally-friendly pollution-free refractory material.
Description
Technical field
The present invention relates to a kind of hydrophobic calcium-based magnesium synthetic clinker, belong to technical field of refractory materials.
Background technology
The calcining of rhombspar divides one-step calcination method and two step calcination methods, and one-step calcination method firing temperature needs more than 1800 ℃, and two step calcination methods need 1600-1650 ℃, but the dolomite sand common defective that two kinds of calcination methods are produced is the hydrolysis problem that can't solve CaO.
At present, the preventing hydration method of the clinker dolomite of domestic and international market and goods thereof employing has:
(1) uses " coating method " with its covering the grog particle, form protective membrane.
(2) grog particle or refractory product are carried out oil immersion, wax soaks.
(3) vacuum packaging.
But these three kinds of methods are all very easily damaged in actual operation, if protective membrane, wax layer, oil reservoir or wrapper destroy, come off or open, cause the preventing hydration poor effect.
Summary of the invention
The object of the present invention is to provide a kind of hydrophobic calcium-based magnesium synthetic clinker, preventing hydration is effective.
Hydrophobic calcium-based magnesium synthetic clinker of the present invention mixes back compression moulding by light dolomite, light calcined magnesia and additive, makes after drying is burnt till again, and wherein ingredients by weight consists of:
Light dolomite 55-65% and light calcined magnesia 35-45%;
Add ferric oxide 0.5-1%, rare earth oxide 0.5-1% and moulding wedding agent 6-7%.
Light-burned being meant with the calcining of material through 1000-1100 ℃ of firing temperature.
Rare earth oxide is CeO
2, Pr
6O
11And Nd
2O
3Three's arbitrary proportion mixture can equal proportion, also can inequality proportion.
The moulding wedding agent is a Mierocrystalline cellulose, as methylcellulose gum or ethyl cellulose etc.
With 400 tons of pressing machine compression mouldings, pressure is big, the compact density height.
Firing temperature 1600-1650 ℃, soaking time 4-6 hour.
In order to improve the dolomite sand volume density, taked the mode of acceleration of sintering, we have added Fe
2O
3Additive is 1600-1650 ℃ of condition of burning forging * 4h equally, and by detecting, the volume density of dolomite sand has increased 0.5g/cm
3, void content has descended 1.0%, simultaneously Fe
2O
3The eutectic that forms with CaO helps improving the hydration resistance of dolomite sand because of covering the CaO surface.And, in calcination process, can form the low melting point purpose of the side's of being covered in calcium stone plane of crystal mutually in order to reach dolomite sand, through long-time practical studies analysis repeatedly, add rare earth oxide, CeO
2(cerium oxide), Pr
6O
11(Praseodymium trioxide) and Nd
2O
3The mixture of (Neodymium trioxide) (being called for short REO) burns till through 1600-1650 ℃ * 4h, and not only density obviously improves, and reaches 3.4g/cm
3, the mutual solid solubility of the rare earth oxide side of making calcium stone and periclasite increases, and has improved water resistance.
What the present invention adopted is two step calcination methods, adopting the high-quality light dolomite is main raw material(s), adapted part light-magnesite powder adds four kinds of additives, through after the fine grinding with the moulding of 400 tons of pressing machine pressed compacts after, burn till the hydrophobic calcium-based magnesium synthetic clinker that makes chemical ingredients MgO 55-65%, CaO 20-45% through 1600-1650 ℃ * 4h.Characteristics that should synthetic grog are environmentally safe, volume density height, void content low, not aquation, strong, the good thermal shock stability of solidity to corrosion.
Hydrophobic calcium-based magnesium synthetic clinker of the present invention; adjustment by batching and preparation technology; obtained high-density and tectal protection has been arranged; on the one hand; high grog volume density is stopped up water and water vapour soaks into passage; on the other hand; the low melting point that the adding additive forms is the side's of covering calcium stone plane of crystal mutually; reduced contacting of square calcium stone and water; preventing hydration is effective; solved the hydrolysis problem of CaO preferably; its thermal shock resistance; solidity to corrosion; abrasion resistance; hot strength is good, can be used as steel melting furnace VOD with this synthetic grog; VAD; AOD; LF stove refractory materials, the cement kiln clinkering zone substitutes magnesia chrome brick with magnesia-calcium brick; not producing deleterious sexavalent chrome, is the high-grade refractory materials that environment-friendly type does not have any pollution.Be applicable to multiple wedding agent brickmaking, particularly the magnesia-calcium brick with this material production is used for the alternative magnesia chrome brick stone ring guarantor of cement kiln clinkering zone nonstaining property refractory materials.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
Hydrophobic calcium-based magnesium synthetic clinker of the present invention,
Hydrophobic calcium-based magnesium synthetic clinker of the present invention, preparation process carry out according to following steps successively:
Ingredients by weight consists of:
Light dolomite 60% and light calcined magnesia 40%;
Add ferric oxide 0.6%, rare earth oxide 0.6% and moulding wedding agent 6%.
Rare earth oxide is CeO
2, Pr
6O
11And Nd
2O
3The mixture of three's equal proportion.
The moulding wedding agent is a methylcellulose gum.
With the compression moulding at full capacity of 400 tons of pressing machinees.
Under the 100-110 temperature, dry then.
Under firing temperature 1630-1650 ℃, adopt the mode of two step calcination methods to calcine, soaking time got final product in 4 hours.
Experimental result:
(1) chemical composition analysis (weight percentage) result
Calcium magnesia sand grog MgO CaO SiO
2Al
2O
3Fe
2O
3Cut down according to the circumstance
Content % 58.48 33.15 3.55 1.33 2.25 0.3
(2) sintering character and hydration resistance detected result
Volume density 3.4g/cm
3, void content 6.1%, aquation rate of body weight gain 0.3%.
(3) make the effect of refractory brick: the fire-resistant konite brick of producing with the present invention's " hydrophobic calcium-based magnesium synthetic clinker " does not need immersion oil, waxdip to handle not aquation yet.
Embodiment 2
Hydrophobic calcium-based magnesium synthetic clinker of the present invention, preparation process carry out according to following steps successively:
Ingredients by weight consists of:
Light dolomite 56% and light calcined magnesia 44%;
Add ferric oxide 0.7%, rare earth oxide 0.7% and moulding wedding agent 7%.
Rare earth oxide is CeO
2, Pr
6O
11And Nd
2O
3Among the three, CeO
2, Pr
6O
11Respectively be 0.2%, Nd
2O
30.3%.
The moulding wedding agent is a methylcellulose gum.
With the compression moulding at full capacity of 400 tons of pressing machinees.
Under the 90-100 temperature, dry then.
Under firing temperature 1610-1630 ℃ temperature, adopt two common step calcination method modes to calcine, soaking time got final product in 4 hours.
Experimental result:
(1) sintering character and hydration resistance detected result
Volume density 3.5g/cm
3, void content 6.0%, aquation rate of body weight gain 0.3%.
(2) make the effect of refractory brick: the fire-resistant konite brick of producing with the present invention's " hydrophobic calcium-based magnesium synthetic clinker " does not need immersion oil, waxdip to handle not aquation yet.
Embodiment 3
Hydrophobic calcium-based magnesium synthetic clinker of the present invention, preparation process carry out according to following steps successively:
Ingredients by weight consists of:
Light dolomite 63% and light calcined magnesia 37%;
Add ferric oxide 0.65%, rare earth oxide 0.8% and moulding wedding agent 6.5%.
CeO in the rare earth oxide
2Be 0.4%, Pr
6O
11Be 0.1%, Nd
2O
3Three is 0.3%.
The moulding wedding agent is an ethyl cellulose.
With the compression moulding at full capacity of 400 tons of pressing machinees.
Under the 105-115 temperature, dry.
Burn till under firing temperature 1600-1650 ℃, adopt common two steps calcination method calcining, soaking time got final product in 5 hours.
Experimental result:
Sintering character and hydration resistance detected result
Volume density 3.6g/cm
3, void content 6.0%, aquation rate of body weight gain 0.26%.
Embodiment 4
Hydrophobic calcium-based magnesium synthetic clinker of the present invention, preparation process carry out according to following steps successively:
Ingredients by weight consists of: light dolomite 62% and light calcined magnesia 38%;
Add ferric oxide 0.6%, rare earth oxide 0.7% and moulding wedding agent 6%.
CeO in the rare earth oxide
2Be 0.3%, Pr
6O
11Be 0.15%, Nd
2O
3Three is 0.25%.
The moulding wedding agent is a methylcellulose gum.
With the compression moulding at full capacity of 400 tons of pressing machinees.
Under the 110-120 temperature, dry.
Burn till under firing temperature 1610-1630 ℃, adopt common two steps calcination method calcining, soaking time got final product in 4.5 hours.
Experimental result:
Sintering character and hydration resistance detected result
Volume density 3.5g/cm
3, void content 6.0%, aquation rate of body weight gain 0.27%.
Claims (4)
1. a hydrophobic calcium-based magnesium synthetic clinker is characterized in that mixing back compression moulding by light dolomite, light calcined magnesia and additive, makes after drying is burnt till again, and wherein ingredients by weight consists of:
Light dolomite 55-65% and light calcined magnesia 35-45%;
Add ferric oxide 0.5-1%, rare earth oxide 0.5-1% and moulding wedding agent 6-7%.
2. hydrophobic calcium-based magnesium synthetic clinker according to claim 1 is characterized in that rare earth oxide is CeO
2, Pr
6O
11And Nd
2O
3Three's arbitrary proportion mixture.
3. hydrophobic calcium-based magnesium synthetic clinker according to claim 1 and 2 is characterized in that the moulding wedding agent is a Mierocrystalline cellulose.
4. hydrophobic calcium-based magnesium synthetic clinker according to claim 3 is characterized in that firing temperature 1600-1650 ℃, soaking time 4-6 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910231306A CN101717266A (en) | 2009-12-02 | 2009-12-02 | Hydrophobic calcium-based magnesium synthetic clinker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910231306A CN101717266A (en) | 2009-12-02 | 2009-12-02 | Hydrophobic calcium-based magnesium synthetic clinker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101717266A true CN101717266A (en) | 2010-06-02 |
Family
ID=42431912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910231306A Pending CN101717266A (en) | 2009-12-02 | 2009-12-02 | Hydrophobic calcium-based magnesium synthetic clinker |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173839A (en) * | 2011-01-28 | 2011-09-07 | 淄博鑫耐达耐火材料股份有限公司 | Binding agent for unfired magnesia brick rich in CaO and preparation method thereof |
| CN102173841A (en) * | 2011-01-30 | 2011-09-07 | 淄博鑫耐达耐火材料股份有限公司 | Hydrophobic magnesium/calcium synthetic clinker and preparation technique thereof |
| CN102643098A (en) * | 2012-05-11 | 2012-08-22 | 贵阳明通炉料有限公司 | Dolomitic high-temperature ceramic matrix composite |
| CN110357645A (en) * | 2019-07-26 | 2019-10-22 | 贵州大学 | A kind of preparation method preparing magnesite-dolomite refractories using dolomite matter phosphorus tailing |
| CN115322000A (en) * | 2022-09-13 | 2022-11-11 | 中钢集团洛阳耐火材料研究院有限公司 | Magnesium-calcium tundish dry material and preparation method thereof |
-
2009
- 2009-12-02 CN CN200910231306A patent/CN101717266A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173839A (en) * | 2011-01-28 | 2011-09-07 | 淄博鑫耐达耐火材料股份有限公司 | Binding agent for unfired magnesia brick rich in CaO and preparation method thereof |
| CN102173841A (en) * | 2011-01-30 | 2011-09-07 | 淄博鑫耐达耐火材料股份有限公司 | Hydrophobic magnesium/calcium synthetic clinker and preparation technique thereof |
| CN102643098A (en) * | 2012-05-11 | 2012-08-22 | 贵阳明通炉料有限公司 | Dolomitic high-temperature ceramic matrix composite |
| CN110357645A (en) * | 2019-07-26 | 2019-10-22 | 贵州大学 | A kind of preparation method preparing magnesite-dolomite refractories using dolomite matter phosphorus tailing |
| CN115322000A (en) * | 2022-09-13 | 2022-11-11 | 中钢集团洛阳耐火材料研究院有限公司 | Magnesium-calcium tundish dry material and preparation method thereof |
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Application publication date: 20100602 |