CN104163642A - Method for improving hydration resistance of calcined magnesium-calcium refractory material - Google Patents
Method for improving hydration resistance of calcined magnesium-calcium refractory material Download PDFInfo
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- CN104163642A CN104163642A CN201410362987.1A CN201410362987A CN104163642A CN 104163642 A CN104163642 A CN 104163642A CN 201410362987 A CN201410362987 A CN 201410362987A CN 104163642 A CN104163642 A CN 104163642A
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Abstract
The invention discloses a method for improving hydration resistance of a calcined magnesium-calcium refractory material, and relates to the field of refractory materials. The method for improving the hydration resistance of the calcined magnesium-calcium refractory material is characterized by comprising the following process: calcining magnesite in the temperature range of 650-850 DEG C, preparing light-burned magnesia after calcination, adding water into the light-burned magnesia, fully hydrating, and then finely grinding; calcining a dolomite ore or a lime ore in the temperature range of 900-1300 DEG C, then evenly mixing the calcined product with the fully-hydrated and finely-ground light-burned magnesia powder and a sintering additive, compacting with the compacting density generally of 1.75-2.40 g/cm<3>, calcining at the temperature of 1600-2000 DEG C with the calcining time of 0.5-20 hours, and thus obtaining dead burned high-calcium magnesite with good hydration resistance. The method can solve the problem of magnesium chloride polluting the environment in a process of producing titanium sponge, and reduces the production cost.
Description
Technical field
The present invention relates to fire resisting material field, be specifically related to the method for the raising calcined magnesium lime refractory hydration resistance in magnesium lime refractory field.
Background technology
Magnesium calcareous material is a kind of refractory materials of excellence, is one of the most stable oxide compound, reacts hardly with various molten metals.Simultaneous oxidation magnesium-lime refractories has the effect of good cleaning molten steel; major cause is the S of CaO easily and in molten steel; the impurity such as P react; and; the material generating after reaction will split away off and float up in protection slag blanket from refractory materials; in the operation in later stage, removed, so just greatly purified molten steel, it can also reduce the effect of O and some nonmetal inclusion simultaneously.Therefore CaO refractory materials is widely used in hot environment field, as the smelting of iron and steel, in the refining and casting industry of alloy.
Along with the development of Iron And Steel Industry and the increase to Clean Steel demand, it is advanced and purifying that steel-smelting technology tends to day by day, and smelting condition is day by day harsh, requirement to refractory materials is more and more higher, should meet work-ing life, environmental protection again, has functionalization, do not pollute molten steel, can cleaning molten steel.Therefore, there is the magnesium calcium series refractory material of high temperature, good slag resistance, resistance to structure spalling, cleaning molten steel in the urgent need to exploitation, to adapt to various exacting terms.
The cleanliness factor of steel and the material of refractory materials, quality, quality and use are closely related.General refractory materials more or less all can pollute molten steel, be not suitable for the requirement that Clean Steel is smelted, and magnesium calcium series refractory material does not only pollute molten steel, also has the function of cleaning molten steel, there is good resistance to elevated temperatures, slag resistance, resistance to heat shocks, high-temperature vacuum stability inferior simultaneously, it is a kind of basic refractory of high-quality, it is the most suitable refractory materials of Clean Steel Smelting, being subject to iron and steel enterprise generally payes attention to, along with the fast development of China's stainless steel and Clean Steel, magnesium calcium series refractory material has entered new developmental stage.
At present, the AOD of refining ladle, VOD stove are with burning till magnesia-calcium brick, unfired magnesia-calcium brick, unfired magnesia-calcium carbon brick, continuous casting tundish lining is that coating, Gunning refractory, magnesium calcium are dry materials with magnesium calcium, ladle is mould material with magnesium calcium, large-scale dry-process cement rotary kiln clinkering zone is with burning till magnesia-calcium brick, magnesia calcium zirconium brick etc., the application of succeeding, but the hydrating capacity of magnesium calcium series refractory material does not also well solve.Develop and there is calcium magnesia sand and series of products thereof technique use value, that hydration resistance is good, production high-quality steel is had to important practical significance, can obtain significant economic benefit and social benefit.
China's rhombspar, konite, magnesite resource are quite abundant, and purity is high, distribute wide, and almost there is dolomite resources in every province, occupies first place in the world, and have the advantageous advantage of exploitation magnesium calcium series refractory material.
But the water resistant problem of magnesium lime refractory does not have fine solution, serious impact the development of magnesium calcium series refractory material, synthetic magnesia-calcium clinker or konite sand generally adopt two step method calcining at present, but there is the poor problem of hydration resistance, two step method is by light dolomite digestion process, the particle of CaO is reduced, make the crystal grain of CaO be eaten up by MgO crystal grain at calcination process, in the lattice of MgO, form sosoloid, cooling rear CaO separates out from MgO sosoloid, be wrapped in the surface of MgO, cause the water resistantization of goods poor, the problem that present method exists for two step method calcined magnesium lime refractory, the new novel process of preparing magnesium lime refractory is proposed, improve the hydration resistance of calcium magnesia sand.
Summary of the invention
The object of the invention is to improve the method for calcined magnesium lime refractory hydration resistance, the method improves calcium magnesia sand hydration resistance, and can solve a difficult problem of producing the magnesium chloride contaminate environment producing in titanium sponge process, can reduce production costs, bring considerable economic benefit and social benefit.
The object of the invention is to be achieved through the following technical solutions:
The method that improves calcined magnesium lime refractory hydration resistance, described method comprises following process: magnesite is calcined within the scope of 650-850 DEG C, made magnesia unslacked after calcining, magnesia unslacked is added water after abundant aquation, fine grinding; Dolomite mineral or square calcium stone ore are calcined within the scope of 900-1300 DEG C, then calcinate is mixed with light-burning magnesium powder and sintering aid after abundant aquation fine grinding, after pressed compact, the density of pressed compact is generally at 1.75-2.40g/cm
3, at the temperature lower calcination of 1600-2000 DEG C, calcination time is 0.5-20 hour, can make the calcium magnesia sand that hydration resistance is good.
The method of described raising calcined magnesium lime refractory hydration resistance, described sintering aid is for sodium-chlor or magnesium chloride hexahydrate or bittern or produce the magnesium chloride producing in titanium sponge process, and the add-on of sintering aid is mass percent 0.1-4.0%.
Advantage and effect
The present invention produces the calcium magnesia sand of large crystal grain CaO, and in process of cooling, MgO will separate out from the saturated solid solution of CaO, covers CaO surface, thereby improves the hydration resistance of calcium magnesia sand.Can solve a difficult problem of producing the magnesium chloride contaminate environment producing in titanium sponge process, reduce production costs, bring considerable economic benefit and social benefit simultaneously.
Brief description of the drawings
Fig. 1 is the embodiment of the present invention 1 process flow sheet;
Fig. 2 is the photo of the embodiment of the present invention 1 sample;
Fig. 3 is the embodiment of the present invention 2 process flow sheets;
Fig. 4 is the photo of the embodiment of the present invention 2 samples;
Fig. 5 is the embodiment of the present invention 3 process flow sheets;
Fig. 6 is the photo of the embodiment of the present invention 3 samples;
Fig. 7 is the embodiment of the present invention 4 process flow sheets;
Fig. 8 is the photo of the embodiment of the present invention 4 samples.
Embodiment
Embodiment 1(NaCl is sintering aid)
Magnesite is calcined within the scope of 650-850 DEG C, after calcining, made magnesia unslacked, caustic-calcined magnesite is added water after abundant aquation, fine grinding.Dolomite mineral is calcined within the scope of 900-1300 DEG C, then calcinate is mixed with passing through abundant aquation the light-burning magnesium powder of fine grinding and the NaCl of 0.10-4.0%, after pressed compact (ball), the density of pressed compact (ball) is generally at 1.75-2.40g/cm
3, at the temperature lower calcination of 1600-2000 DEG C, calcination time is 0.5-20 hour, can make the calcium magnesia sand that hydration resistance is good.Its process flow sheet as shown in Figure 1.
The sample of the calcium magnesia sand making after fragmentation as shown in Figure 2, wherein CaO>=20%, MgO+ CaO>=98.0%, foreign matter content is less than 1.5%, volume density>=3.35g/cm
3, in air, deposit 7 months not aquations.
Embodiment 2(MgCl
26H
2o is sintering aid)
Magnesite is calcined within the scope of 650-850 DEG C, after calcining, made magnesia unslacked, caustic-calcined magnesite is added water after abundant aquation, fine grinding.Calcite ore is calcined within the scope of 900-1300 DEG C, then by calcinate and the abundant aquation of process the light-burning magnesium powder of fine grinding and the MgCl of 0.10-5.0%
26H
2o evenly mixes, and after pressed compact (ball), the density of pressed compact (ball) is generally at 1.75-2.40g/cm
3, at the temperature lower calcination of 1600-2000 DEG C, calcination time is 0.5-20 hour, can make the calcium magnesia sand that hydration resistance is good.Its process flow sheet as shown in Figure 2.
The calcium magnesia sand sample making after fragmentation as shown in Figure 2, CaO>=50%, MgO+ CaO>=98.0%, foreign matter content is less than 2.0%, volume density>=3.35g/cm
3, in air, deposit 5 months not aquations.
Embodiment 3(bittern is sintering aid)
Magnesite is calcined within the scope of 650-850 DEG C, after calcining, made magnesia unslacked, caustic-calcined magnesite is added water after abundant aquation, fine grinding.Calcite ore is calcined within the scope of 900-1300 DEG C, then by calcinate with after fine grinding, evenly mix through the light-burning magnesium powder of abundant aquation and the bittern of 0.10-4.0%, after pressed compact (ball), the density of pressed compact (ball) is generally at 1.75-2.40g/cm
3, at the temperature lower calcination of 1600-2000 DEG C, calcination time is 0.5-20 hour, can make the magnesium calcisphere that hydration resistance is good.Its process flow sheet as shown in Figure 3.
Calcium magnesia sand CaO>=20% making through fragmentation, MgO+ CaO>=98.0%, foreign matter content is less than 2.0%, volume density>=3.35g/cm
3, in air, deposit 7 months not aquations.
It is sintering aid that embodiment 4(produces the magnesium chloride producing in titanium sponge process)
Magnesite is calcined within the scope of 650-850 DEG C, after calcining, made magnesia unslacked, caustic-calcined magnesite is added water after abundant aquation, fine grinding.Calcite ore is calcined within the scope of 900-1300 DEG C, then by calcinate with after fine grinding, evenly mix through the light-burning magnesium powder of abundant aquation and the bittern of 0.10-4.0%, after pressed compact (ball), the density of pressed compact (ball) is generally at 1.75-2.40g/cm
3, at the temperature lower calcination of 1600-2000 DEG C, calcination time is 0.5-20 hour, can make the magnesium calcium block that hydration resistance is good.Its process flow sheet as shown in Figure 3.
Magnesium calcium block CaO>=60% making, MgO+ CaO>=98.0%, foreign matter content is less than 2.0%, volume density>=3.35g/cm
3, in air, deposit 6 months not aquations.
Claims (2)
1. the method that improves calcined magnesium lime refractory hydration resistance, is characterized in that, described method comprises following process: magnesite is calcined within the scope of 650-850 DEG C, made magnesia unslacked after calcining, magnesia unslacked is added water after abundant aquation, fine grinding; Dolomite mineral or square calcium stone ore are calcined within the scope of 900-1300 DEG C, then calcinate is mixed with light-burning magnesium powder and sintering aid after abundant aquation fine grinding, after pressed compact, the density of pressed compact is generally at 1.75-2.40g/cm
3, at the temperature lower calcination of 1600-2000 DEG C, calcination time is 0.5-20 hour, can make the calcium magnesia sand that hydration resistance is good.
2. the method for raising calcined magnesium lime refractory hydration resistance according to claim 1, it is characterized in that, described sintering aid is for sodium-chlor or magnesium chloride hexahydrate or bittern or produce the magnesium chloride producing in titanium sponge process, and the add-on of sintering aid is mass percent 0.1-4.0%.
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| CN201410362987.1A CN104163642B (en) | 2014-07-29 | 2014-07-29 | Improve the method for calcined magnesium lime refractory hydration resistance |
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| CN201410362987.1A CN104163642B (en) | 2014-07-29 | 2014-07-29 | Improve the method for calcined magnesium lime refractory hydration resistance |
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| CN104163642A true CN104163642A (en) | 2014-11-26 |
| CN104163642B CN104163642B (en) | 2016-04-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110372403A (en) * | 2019-07-26 | 2019-10-25 | 贵州大学 | A kind of preparation method using phosphorus tailing preparation hydration-resisting type magnesite-dolomite refractories |
| CN111410443A (en) * | 2020-04-30 | 2020-07-14 | 海城市军刚中档镁砂有限公司 | MgO-CaO-ZrO2Method for producing sand |
| CN111517759A (en) * | 2020-04-30 | 2020-08-11 | 辽宁科技大学 | Preparation method of high-thermal-shock high-hydration-resistance MgO-CaO sand |
| CN113354446A (en) * | 2021-07-13 | 2021-09-07 | 云南铜业股份有限公司西南铜业分公司 | Refractory material for fixed anode furnace and preparation method thereof |
| CN114804899A (en) * | 2022-05-05 | 2022-07-29 | 武汉科技大学 | Rare earth metal ion modified magnesia-calcium sand and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1227827A (en) * | 1999-01-20 | 1999-09-08 | 杨庆广 | Calcining of high-purity Mg-Ca synthesized sand by vertical high-temp. oil kiln and its producing process |
-
2014
- 2014-07-29 CN CN201410362987.1A patent/CN104163642B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1227827A (en) * | 1999-01-20 | 1999-09-08 | 杨庆广 | Calcining of high-purity Mg-Ca synthesized sand by vertical high-temp. oil kiln and its producing process |
Non-Patent Citations (1)
| Title |
|---|
| 万伟伟: "CaO陶瓷的制备及其结构与性能的研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110372403A (en) * | 2019-07-26 | 2019-10-25 | 贵州大学 | A kind of preparation method using phosphorus tailing preparation hydration-resisting type magnesite-dolomite refractories |
| CN111410443A (en) * | 2020-04-30 | 2020-07-14 | 海城市军刚中档镁砂有限公司 | MgO-CaO-ZrO2Method for producing sand |
| CN111517759A (en) * | 2020-04-30 | 2020-08-11 | 辽宁科技大学 | Preparation method of high-thermal-shock high-hydration-resistance MgO-CaO sand |
| CN113354446A (en) * | 2021-07-13 | 2021-09-07 | 云南铜业股份有限公司西南铜业分公司 | Refractory material for fixed anode furnace and preparation method thereof |
| CN114804899A (en) * | 2022-05-05 | 2022-07-29 | 武汉科技大学 | Rare earth metal ion modified magnesia-calcium sand and preparation method thereof |
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| CN104163642B (en) | 2016-04-06 |
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Granted publication date: 20160406 Termination date: 20180729 |