CN104446569A - Magnesia refractory material and preparation method thereof - Google Patents
Magnesia refractory material and preparation method thereof Download PDFInfo
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- CN104446569A CN104446569A CN201410779857.8A CN201410779857A CN104446569A CN 104446569 A CN104446569 A CN 104446569A CN 201410779857 A CN201410779857 A CN 201410779857A CN 104446569 A CN104446569 A CN 104446569A
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Abstract
The invention relates to a magnesia refractory material and a preparation method thereof. The technical scheme is that the preparation method comprises the following steps: uniformly mixing 35-70wt% of talc powder, 25-60wt% of magnesium salts and 0.1-5wt% of a surfactant, and performing ball milling for 1-5 hours to obtain a ball milling material; drying the ball milling material, additionally adding a silica raw material accounting for 5-15wt% of the dried ball milling material, mixing uniformly, and performing mechanical pressing for the first time; then preserving the heat for 1-5 hours at 400-800 DEG C to obtain a pre-sintered material; crushing the pre-sintered material, and ball-milling the crushed pre-sintered material to have a particle size of less than 0.088mm, thereby obtaining abrasive powder; taking 5-10wt% of the abrasive powder, 50-80wt% of magnesia particles, 10-40wt% of magnesia powder and 5-10wt% of the silica raw material to form a mixed material, additionally adding silica sol accounting for 1-5wt% of the mixed material, mixing uniformly, performing mechanical pressing for the second time, and drying; and finally, firing for 2-6 hours at 1500-1600 DEG C to obtain the magnesia refractory material. The magnesia refractory material prepared by the method provided by the invention has the characteristics of excellent high-temperature resistance, high strength, excellent erosion resistance and high thermal shock stability.
Description
Technical field
The invention belongs to technical field of refractory materials.Be specifically related to a kind of magnesite refractory and preparation method thereof.
Background technology
Take magnesium oxide as main component and be that the refractory materials of principal crystalline phase is referred to as magnesite refractory with periclasite.Except principal crystalline phase periclasite, also containing silicate, spinel or other compositions in many magnesia fireproof goods.
Refractoriness is high because having for magnesite refractory, alkali-resistivity slag and the feature such as scum erosional competency is strong, is widely used in the industries such as metallurgy, cement, glass.But the thermal shock resistance of magnesite refractory and resistance to acid gas pickling poor be that it obtains the major obstacle of more widespread use.
Though the magnesite refractory of current preparation has many advantages, but still there is certain defect.As added titanium dioxide, though magnesium titanate can be generated with magnesium oxide promote densifying materials, add aluminum oxide formation aluminium titanates and also there is similar effect, but because the magnesian blending ratio larger with the coefficient of expansion is larger, thus material structure is unstable, and intensity is low, the resistance to fouling problems such as especially resistance to acid gas pickling is poor to cause magnesian to occur.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art, and object is to provide that a kind of resistance to elevated temperatures is excellent, intensity is high, erosion-resisting characteristics is excellent and the magnesite refractory of good thermal shock stability and preparation method thereof.
For achieving the above object, the concrete steps of the technical solution used in the present invention are:
The first step, the tensio-active agent of the talcum powder of 35 ~ 70wt%, the magnesium salts of 25 ~ 60wt% and 0.1 ~ 5wt% to be mixed, ball milling 1 ~ 5h, obtain ball milling material.
Second step, by ball milling material dry 12 ~ 24h under 80 ~ 105 DEG C of conditions, then the siliceous raw material of additional dried ball milling material 5 ~ 15wt%, mixes, first time mechanical pressing, then under 400 ~ 800 DEG C of conditions, be incubated 1 ~ 5h, obtain Preburning material.
3rd step, Preburning material is broken, then be milled to granularity and be less than 0.088mm, obtain grinding material.
4th step, with the siliceous raw material of the grinding material of 5 ~ 10wt%, the magnesia particle of 50 ~ 80wt%, the magnesia powder of 10 ~ 40wt% and 5 ~ 10wt% for compound, the silicon sol of additional compound 1 ~ 5wt% again, mix, second time mechanical pressing, dry 12 ~ 24h under 80 ~ 110 DEG C of conditions, finally under 1500 ~ 1600 DEG C of conditions, burn till 2 ~ 6h, obtain magnesite refractory.
Wherein:
Described magnesium salts is the one in magnesium acetate, magnesium citrate, magnesium chloride, magnesium sulfate and magnesium nitrate;
Described tensio-active agent is glycerin fatty acid ester or is polysorbate;
In described magnesia particle, content of MgO is greater than 90 wt %, and granularity is 0.088 ~ 5mm;
In described magnesia powder, content of MgO is greater than 90 wt %, granularity < 0.088mm;
Described siliceous raw material is the one in simple substance silica flour, white carbon black, silicon powder, fused quartz powder and vein quartz powder;
Described first time, the pressure of mechanical pressing was 80 ~ 120MPa;
The pressure of described second time mechanical pressing is 120 ~ 180MPa.
Owing to adopting technique scheme, the present invention is optimized preparing the structure of main raw material needed for magnesite refractory, therefore use it for after in magnesite refractory, not only have adjusted the structure of magnesite refractory, and prepared magnesite refractory have higher compressive strength (being greater than 100MPa), excellent resistance to fouling, good thermal shock resistance and excellent resistance to elevated temperatures.
Therefore, the magnesite refractory that prepared by the present invention has that resistance to elevated temperatures is excellent, intensity is high, erosion-resisting characteristics is excellent and the feature of good thermal shock stability.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, the restriction not to its protection domain.
For avoiding repetition, first by magnesia particle described in this embodiment and described magnesia powder Unify legislation as follows, repeat no more in embodiment:
In described magnesia particle, content of MgO is greater than 90 wt %, and granularity is 0.088 ~ 5mm;
In described magnesia powder, content of MgO is greater than 90 wt %, granularity < 0.088mm.
embodiment 1
A kind of magnesite refractory and preparation method thereof.Described in the present embodiment, the concrete steps of preparation method are:
The first step, the tensio-active agent of the talcum powder of 35 ~ 45wt%, the magnesium salts of 50 ~ 60wt% and 3 ~ 5wt% to be mixed, ball milling 1 ~ 3h, obtain ball milling material.
Second step, by ball milling material dry 12 ~ 24h under 80 ~ 105 DEG C of conditions, then the siliceous raw material of additional dried ball milling material 5 ~ 10wt%, mixes, first time mechanical pressing, then under 600 ~ 800 DEG C of conditions, be incubated 3 ~ 5h, obtain Preburning material.
3rd step, Preburning material is broken, then be milled to granularity and be less than 0.088mm, obtain grinding material.
4th step, with the siliceous raw material of the grinding material of 8 ~ 10wt%, the magnesia particle of 50 ~ 60wt%, the magnesia powder of 20 ~ 30wt% and 8 ~ 10wt% for compound, the silicon sol of additional compound 3 ~ 5wt% again, mix, second time mechanical pressing, dry 12 ~ 24h under 80 ~ 110 DEG C of conditions, finally under 1500 ~ 1600 DEG C of conditions, burn till 4 ~ 6h, obtain magnesite refractory.
In the present embodiment: described magnesium salts is magnesium citrate; Described tensio-active agent is polysorbate; Described siliceous raw material is white carbon black; Described first time, the pressure of mechanical pressing was 80 ~ 100MPa; The pressure of described second time mechanical pressing is 120 ~ 150MPa.
Magnesite refractory prepared by the present embodiment has the resistance to fouling of higher compressive strength (being greater than 105MPa), excellent resistance to elevated temperatures, good thermal shock stability and excellence.
embodiment 2
A kind of magnesite refractory and preparation method thereof.Described in the present embodiment, the concrete steps of preparation method are:
The first step, the tensio-active agent of the talcum powder of 45 ~ 55wt%, the magnesium salts of 40 ~ 50wt% and 3 ~ 5wt% to be mixed, ball milling 3 ~ 5h, obtain ball milling material.
Second step, by ball milling material dry 12 ~ 24h under 80 ~ 105 DEG C of conditions, then the siliceous raw material of additional dried ball milling material 10 ~ 15wt%, mixes, first time mechanical pressing, then under 400 ~ 600 DEG C of conditions, be incubated 1 ~ 3h, obtain Preburning material.
3rd step, Preburning material is broken, then be milled to granularity and be less than 0.088mm, obtain grinding material.
4th step, with the siliceous raw material of the grinding material of 5 ~ 8wt%, the magnesia particle of 65 ~ 80wt%, the magnesia powder of 10 ~ 25wt% and 5 ~ 8wt% for compound, the silicon sol of additional compound 1 ~ 3wt% again, mix, second time mechanical pressing, dry 12 ~ 24h under 80 ~ 110 DEG C of conditions, finally under 1500 ~ 1600 DEG C of conditions, burn till 2 ~ 4h, obtain magnesite refractory.
In the present embodiment: described magnesium salts is magnesium chloride; Described tensio-active agent is glycerin fatty acid ester; Described siliceous raw material is silicon powder; Described first time, the pressure of mechanical pressing was 100 ~ 120MPa; The pressure of described second time mechanical pressing is 150 ~ 180MPa.
Magnesite refractory prepared by the present embodiment has the resistance to fouling of higher compressive strength (being greater than 120MPa), excellent resistance to elevated temperatures, good thermal shock stability and excellence.
embodiment 3
A kind of magnesite refractory and preparation method thereof.Described in the present embodiment, the concrete steps of preparation method are:
The first step, the tensio-active agent of the talcum powder of 55 ~ 70wt%, the magnesium salts of 25 ~ 40wt% and 3 ~ 5wt% to be mixed, ball milling 1 ~ 3h, obtain ball milling material.
Second step, by ball milling material dry 12 ~ 24h under 80 ~ 105 DEG C of conditions, then the siliceous raw material of additional dried ball milling material 5 ~ 10wt%, mixes, first time mechanical pressing, then under 600 ~ 800 DEG C of conditions, be incubated 3 ~ 5h, obtain Preburning material.
3rd step, Preburning material is broken, then be milled to granularity and be less than 0.088mm, obtain grinding material.
4th step, with the siliceous raw material of the grinding material of 5 ~ 7wt%, the magnesia particle of 50 ~ 60wt%, the magnesia powder of 25 ~ 40wt% and 5 ~ 8wt% for compound, the silicon sol of additional compound 3 ~ 5wt% again, mix, second time mechanical pressing, dry 12 ~ 24h under 80 ~ 110 DEG C of conditions, finally under 1500 ~ 1600 DEG C of conditions, burn till 4 ~ 6h, obtain magnesite refractory.
In the present embodiment: described magnesium salts is magnesium sulfate; Described tensio-active agent is glycerin fatty acid ester; Described siliceous raw material is fused quartz powder; Described first time, the pressure of mechanical pressing was 80 ~ 100MPa; The pressure of described second time mechanical pressing is 120 ~ 150MPa.
Magnesite refractory prepared by the present embodiment has the resistance to fouling of higher compressive strength (being greater than 110MPa), excellent resistance to elevated temperatures, good thermal shock stability and excellence.
embodiment 4
A kind of magnesite refractory and preparation method thereof.Described in the present embodiment, the concrete steps of preparation method are:
The first step, the tensio-active agent of the talcum powder of 60 ~ 70wt%, the magnesium salts of 29 ~ 39wt% and 0.1 ~ 1wt% to be mixed, ball milling 3 ~ 5h, obtain ball milling material.
Second step, by ball milling material dry 12 ~ 24h under 80 ~ 105 DEG C of conditions, then the siliceous raw material of additional dried ball milling material 10 ~ 15wt%, mixes, first time mechanical pressing, then under 400 ~ 600 DEG C of conditions, be incubated 1 ~ 3h, obtain Preburning material.
3rd step, Preburning material is broken, then be milled to granularity and be less than 0.088mm, obtain grinding material.
4th step, with the siliceous raw material of the grinding material of 5 ~ 8wt%, the magnesia particle of 55 ~ 65wt%, the magnesia powder of 20 ~ 30wt% and 5 ~ 8wt% for compound, the silicon sol of additional compound 1 ~ 3wt% again, mix, second time mechanical pressing, dry 12 ~ 24h under 80 ~ 110 DEG C of conditions, finally under 1500 ~ 1600 DEG C of conditions, burn till 2 ~ 4h, obtain magnesite refractory.
In the present embodiment: described magnesium salts is magnesium nitrate; Described tensio-active agent is glycerin fatty acid ester; Described siliceous raw material is vein quartz powder; Described first time, the pressure of mechanical pressing was 100 ~ 120MPa; The pressure of described second time mechanical pressing is 150 ~ 180MPa.
The standby magnesite refractory of this legal system is utilized to have the resistance to fouling of higher compressive strength (being greater than 105MPa), excellent resistance to elevated temperatures, good thermal shock stability and excellence.
embodiment 5
A kind of magnesite refractory and preparation method thereof.Described in the present embodiment, the concrete steps of preparation method are:
The first step, the tensio-active agent of the talcum powder of 45 ~ 57wt%, the magnesium salts of 40 ~ 52wt% and 1 ~ 3wt% to be mixed, ball milling 1 ~ 3h, obtain ball milling material.
Second step, by ball milling material dry 12 ~ 24h under 80 ~ 105 DEG C of conditions, then the siliceous raw material of additional dried ball milling material 5 ~ 10wt%, mixes, first time mechanical pressing, then under 600 ~ 800 DEG C of conditions, be incubated 3 ~ 5h, obtain Preburning material.
3rd step, Preburning material is broken, then be milled to granularity and be less than 0.088mm, obtain grinding material.
4th step, with the siliceous raw material of the grinding material of 8 ~ 10wt%, the magnesia particle of 50 ~ 60wt%, the magnesia powder of 20 ~ 30wt% and 8 ~ 10wt% for compound, the silicon sol of additional compound 3 ~ 5wt% again, mix, second time mechanical pressing, dry 12 ~ 24h under 80 ~ 110 DEG C of conditions, finally under 1500 ~ 1600 DEG C of conditions, burn till 4 ~ 6h, obtain magnesite refractory.
In the present embodiment: described magnesium salts is magnesium acetate; Described tensio-active agent is polysorbate; Described siliceous raw material is simple substance silica flour; Described first time, the pressure of mechanical pressing was 80 ~ 100MPa; The pressure of described second time mechanical pressing is 120 ~ 150MPa.
The standby magnesite refractory of this legal system is utilized to have the resistance to fouling of higher compressive strength (being greater than 115MPa), excellent resistance to elevated temperatures, good thermal shock stability and excellence.
embodiment 6
A kind of magnesite refractory and preparation method thereof.Described in the present embodiment, the concrete steps of preparation method are:
The first step, the tensio-active agent of the talcum powder of 35 ~ 45wt%, the magnesium salts of 50 ~ 60wt% and 3 ~ 5wt% to be mixed, ball milling 3 ~ 5h, obtain ball milling material.
Second step, by ball milling material dry 12 ~ 24h under 80 ~ 105 DEG C of conditions, then the siliceous raw material of additional dried ball milling material 10 ~ 15wt%, mixes, first time mechanical pressing, then under 400 ~ 600 DEG C of conditions, be incubated 1 ~ 3h, obtain Preburning material.
3rd step, Preburning material is broken, then be milled to granularity and be less than 0.088mm, obtain grinding material.
4th step, with the siliceous raw material of the grinding material of 5 ~ 8wt%, the magnesia particle of 65 ~ 80wt%, the magnesia powder of 10 ~ 25wt% and 5 ~ 8wt% for compound, the silicon sol of additional compound 1 ~ 3wt% again, mix, second time mechanical pressing, dry 12 ~ 24h under 80 ~ 110 DEG C of conditions, finally under 1500 ~ 1600 DEG C of conditions, burn till 2 ~ 4h, obtain magnesite refractory.
In the present embodiment: described magnesium salts is magnesium citrate; Described tensio-active agent is polysorbate; Described siliceous raw material is fused quartz powder; Described first time, the pressure of mechanical pressing was 100 ~ 120MPa; The pressure of described second time mechanical pressing is 150 ~ 180MPa.
The standby magnesite refractory of this legal system is utilized to have the resistance to fouling of higher compressive strength (being greater than 110MPa), excellent resistance to elevated temperatures, good thermal shock stability and excellence.
This embodiment is optimized preparing the structure of main raw material needed for magnesite refractory, therefore use it for after in magnesite refractory, not only have adjusted the structure of magnesite refractory, and prepared magnesite refractory have higher compressive strength (being greater than 100MPa), excellent resistance to fouling, good thermal shock resistance and excellent resistance to elevated temperatures.
Therefore, the magnesite refractory that prepared by this embodiment has that resistance to elevated temperatures is excellent, intensity is high, erosion-resisting characteristics is excellent and the feature of good thermal shock stability.
Claims (9)
1. a preparation method for magnesite refractory, is characterized in that the concrete steps of described preparation method are:
The first step, the tensio-active agent of the talcum powder of 35 ~ 70wt%, the magnesium salts of 25 ~ 60wt% and 0.1 ~ 5wt% to be mixed, ball milling 1 ~ 5h, obtain ball milling material;
Second step, by ball milling material dry 12 ~ 24h under 80 ~ 105 DEG C of conditions, then the siliceous raw material of additional dried ball milling material 5 ~ 15wt%, mixes, first time mechanical pressing, then under 400 ~ 800 DEG C of conditions, be incubated 1 ~ 5h, obtain Preburning material;
3rd step, Preburning material is broken, then be milled to granularity and be less than 0.088mm, obtain grinding material;
4th step, with the siliceous raw material of the grinding material of 5 ~ 10wt%, the magnesia particle of 50 ~ 80wt%, the magnesia powder of 10 ~ 40wt% and 5 ~ 10wt% for compound, the silicon sol of additional compound 1 ~ 5wt% again, mix, second time mechanical pressing, dry 12 ~ 24h under 80 ~ 110 DEG C of conditions, finally under 1500 ~ 1600 DEG C of conditions, burn till 2 ~ 6h, obtain magnesite refractory.
2. the preparation method of magnesite refractory according to claim 1, is characterized in that described magnesium salts is the one in magnesium acetate, magnesium citrate, magnesium chloride, magnesium sulfate and magnesium nitrate.
3. the preparation method of magnesite refractory according to claim 1, is characterized in that described tensio-active agent is glycerin fatty acid ester or is polysorbate.
4. the preparation method of magnesite refractory according to claim 1, it is characterized in that in described magnesia particle, content of MgO is greater than 90 wt %, granularity is 0.088 ~ 5mm.
5. the preparation method of magnesite refractory according to claim 1, is characterized in that in described magnesia powder, content of MgO is greater than 90 wt %, granularity < 0.088mm.
6. the preparation method of magnesite refractory according to claim 1, is characterized in that described siliceous raw material is the one in simple substance silica flour, white carbon black, silicon powder, fused quartz powder and vein quartz powder.
7. the preparation method of magnesite refractory according to claim 1, is characterized in that the pressure of described first time mechanical pressing is 80 ~ 120MPa.
8. the preparation method of magnesite refractory according to claim 1, is characterized in that the pressure of described second time mechanical pressing is 120 ~ 180MPa.
9. a magnesite refractory, is characterized in that described magnesite refractory is the magnesite refractory prepared by the preparation method of magnesite refractory described in claim 1 ~ 8.
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| CN201410779857.8A CN104446569B (en) | 2014-12-17 | 2014-12-17 | A kind of magnesite refractory and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106187108A (en) * | 2016-07-22 | 2016-12-07 | 武汉科技大学 | A kind of high temperature kiln magnesia refractories and preparation method thereof |
| CN109279906A (en) * | 2018-11-22 | 2019-01-29 | 武汉科技大学 | A kind of castable and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102786309A (en) * | 2012-04-24 | 2012-11-21 | 上海唐盾材料科技有限公司 | Fire-resistance type magnesium oxide board |
| CN103319147A (en) * | 2013-06-13 | 2013-09-25 | 张家港长盛伟业建材有限公司 | Mothproof waterproof magnesium oxide refractory slab |
| CN103992094A (en) * | 2014-04-21 | 2014-08-20 | 徐高强 | Fireproof glass magnesium board and preparation method |
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2014
- 2014-12-17 CN CN201410779857.8A patent/CN104446569B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102786309A (en) * | 2012-04-24 | 2012-11-21 | 上海唐盾材料科技有限公司 | Fire-resistance type magnesium oxide board |
| CN103319147A (en) * | 2013-06-13 | 2013-09-25 | 张家港长盛伟业建材有限公司 | Mothproof waterproof magnesium oxide refractory slab |
| CN103992094A (en) * | 2014-04-21 | 2014-08-20 | 徐高强 | Fireproof glass magnesium board and preparation method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106187108A (en) * | 2016-07-22 | 2016-12-07 | 武汉科技大学 | A kind of high temperature kiln magnesia refractories and preparation method thereof |
| CN106187108B (en) * | 2016-07-22 | 2018-11-13 | 武汉科技大学 | A kind of high temperature kiln magnesia refractories and preparation method thereof |
| CN109279906A (en) * | 2018-11-22 | 2019-01-29 | 武汉科技大学 | A kind of castable and preparation method thereof |
| CN109279906B (en) * | 2018-11-22 | 2021-06-04 | 武汉科技大学 | Magnesium castable and preparation method thereof |
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| CN104446569B (en) | 2016-03-30 |
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Granted publication date: 20160330 Termination date: 20161217 |