CN105692661A - Magnesium oxide material and preparing method thereof - Google Patents
Magnesium oxide material and preparing method thereof Download PDFInfo
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- CN105692661A CN105692661A CN201610152314.2A CN201610152314A CN105692661A CN 105692661 A CN105692661 A CN 105692661A CN 201610152314 A CN201610152314 A CN 201610152314A CN 105692661 A CN105692661 A CN 105692661A
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 87
- 239000000463 material Substances 0.000 title claims abstract description 47
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title description 7
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000011259 mixed solution Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 15
- 239000000243 solution Substances 0.000 claims abstract description 15
- WPJWIROQQFWMMK-UHFFFAOYSA-L beryllium dihydroxide Chemical compound [Be+2].[OH-].[OH-] WPJWIROQQFWMMK-UHFFFAOYSA-L 0.000 claims abstract description 14
- 229910001865 beryllium hydroxide Inorganic materials 0.000 claims abstract description 14
- 239000011268 mixed slurry Substances 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052790 beryllium Inorganic materials 0.000 claims 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims 1
- 238000001816 cooling Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 10
- 239000011819 refractory material Substances 0.000 abstract description 10
- 230000036571 hydration Effects 0.000 abstract description 9
- 238000006703 hydration reaction Methods 0.000 abstract description 9
- 230000003628 erosive effect Effects 0.000 abstract description 4
- 239000004615 ingredient Substances 0.000 abstract description 2
- 239000001095 magnesium carbonate Substances 0.000 description 6
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 6
- 235000014380 magnesium carbonate Nutrition 0.000 description 6
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 239000011449 brick Substances 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 229910019440 Mg(OH) Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910052599 brucite Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011823 monolithic refractory Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/02—Magnesia
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
本发明涉及一种氧化镁材料及其制备方法。其技术方案是：先按氧化镁细粉和混合溶液的质量比为1∶2配料，置于混合机中共混0.5~8小时，得混合浆料；再将混合浆料滤干，在110℃条件下干燥24小时，得到混合料块；然后将混合料块于1000~1300℃条件下保温1~6小时，冷却，球磨至1~200μm，即得氧化铝材料。所述混合溶液为氢氧化铍和草酸溶液的混合溶液，其中：氢氧化铍为5~30wt%，草酸溶液为70~95wt%。本发明所制备的氧化镁材料具有抗水化性能好、高温性能稳定、高温强度大和耐侵蚀形优良的特点，是制备高温工业用高级耐火材料的新型原料。The invention relates to a magnesium oxide material and a preparation method thereof. The technical plan is: firstly mix the ingredients according to the mass ratio of magnesia fine powder and the mixed solution at 1:2, put them in the mixer and mix them for 0.5~8 hours to obtain the mixed slurry; Dry under the same conditions for 24 hours to obtain a mixture block; then keep the mixture block at 1000~1300°C for 1~6 hours, cool, and ball mill to 1~200μm to obtain an alumina material. The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein the content of beryllium hydroxide is 5-30wt%, and the oxalic acid solution is 70-95wt%. The magnesium oxide material prepared by the invention has the characteristics of good hydration resistance, stable high-temperature performance, high-temperature strength and excellent erosion-resistant shape, and is a new type of raw material for preparing high-grade refractory materials for high-temperature industries.
Description
技术领域technical field
本发明属于耐火材料技术领域。尤其涉及一种氧化镁材料及其制备方法。The invention belongs to the technical field of refractory materials. In particular, it relates to a magnesium oxide material and a preparation method thereof.
背景技术Background technique
镁质材料是目前应用最广泛的耐火材料品种，其主要矿物原料为镁砂(化学成分为氧化镁)。镁砂主要分为烧结镁砂、海水镁砂和电熔镁砂三种。烧结镁砂主要由菱镁矿、水镁矿或从海水中提取的氢氧化镁经高温煅烧而成。以天然菱镁矿为原料烧制的烧死镁砂称为烧结镁砂，以菱镁矿等为原料经电弧炉熔炼达到熔融状态冷却后形成的称为电熔镁砂，从海水中提取氧化镁制成的称为海水镁砂。随着高温工业的技术的进步和耐火材料技术的发展，对镁砂的品位提出了多种要求。其中，高纯镁砂是选用天然特级菱镁矿石浮选提纯经轻烧、细磨、压球、超高温竖窑煅烧而成，是制砖和不定耐火材料优质原料；中档镁砂是以轻烧氧化镁为原料，经压球、高温竖窑煅烧等工艺生产而成，产品烧结程度好，结晶致密，是生产中档镁质耐火制品的优质原料，也可用于制造各种镁砖、镁铝砖、捣打料、补炉料等。含镁砂的镁质耐火材料具有烧后线变化较小、强度高、抗碱性渣侵蚀的能力强以及耐钠盐熔融物侵蚀能力强等优点，而且制造成本适中，因而在高温工业中有着广泛的应用，既可以制成定型产品也可以制成不定形产品使用，如镁碳砖、镁铝碳砖、镁钙砖、镁质涂料和镁质浇注料等等。Magnesia material is the most widely used refractory material at present, and its main mineral raw material is magnesia (chemical composition is magnesium oxide). Magnesia is mainly divided into three types: sintered magnesia, seawater magnesia and fused magnesia. Sintered magnesia is mainly calcined at high temperature by magnesite, brucite or magnesium hydroxide extracted from seawater. The burnt magnesite fired with natural magnesite as raw material is called sintered magnesite, and the magnesite is smelted with electric arc furnace as raw material to reach a molten state and then cooled, which is called fused magnesia, which is extracted from seawater and oxidized. Magnesium is called seawater magnesia. With the technical progress of high temperature industry and the development of refractory material technology, various requirements are put forward for the grade of magnesia. Among them, high-purity magnesia is made of natural super-grade magnesite ore flotation purification, light burning, fine grinding, ball pressing, and ultra-high temperature shaft kiln calcination. It is a high-quality raw material for brick making and indeterminate refractory materials; Magnesium is used as a raw material, and it is produced by pressing balls, calcining in a high-temperature shaft kiln, etc. The product has a good sintering degree and dense crystallization. It is a high-quality raw material for the production of mid-range magnesia refractory products. Ramping material, repairing material, etc. The magnesia refractory material containing magnesia has the advantages of small line change after burning, high strength, strong ability to resist alkaline slag erosion and strong erosion resistance to sodium salt melt, and the manufacturing cost is moderate, so it has a certain role in high temperature industry. Wide range of applications, it can be made into shaped products or unshaped products, such as magnesia-carbon bricks, magnesia-alumina-carbon bricks, magnesia-calcium bricks, magnesia coatings and magnesia castables, etc.
但是，不定形和不含碳的镁质耐火材料有着普遍的缺点，即：抗渣渗透性较差，易剥落、易水化和干燥过程容易产生裂纹等问题影响到了镁质产品的使用效果，这就导致了当浇注料已成为目前国内外主要不定形耐火材料品种时，而镁质浇注料在其中的比重却很低的局面。其原因主要有两个方面：1)镁砂容易水化及镁质浇注料在干燥过程容易产生裂纹；2)镁砂的化学成分为MgO，高温下MgO容易和其它杂质氧化物如CaO、SiO2、Fe2O3和Al2O3等发生化学反应形成低熔点化合物，即降低了镁质材料的荷重软化温度，又降低了镁质材料的抗渣渗透能力。因此，对镁砂或氧化镁材料进行改性，已成为提高镁质材料尤其是镁质浇注料性能的重要途径。However, amorphous and carbon-free magnesia refractories have common disadvantages, namely: poor slag permeability, easy peeling, easy hydration, and cracks during drying, which affect the use of magnesia products. This has led to a situation where the proportion of magnesia castables is very low when castables have become the main variety of monolithic refractory materials at home and abroad. There are two main reasons for this: 1) magnesia is easy to hydrate and magnesia castables are prone to cracks during the drying process; 2) the chemical composition of magnesia is MgO, and MgO easily reacts with other impurities such as CaO and SiO at high temperatures. 2. Fe 2 O 3 and Al 2 O 3 react chemically to form low-melting point compounds, which not only lowers the load softening temperature of magnesia materials, but also reduces the slag penetration resistance of magnesia materials. Therefore, modifying magnesia or magnesia materials has become an important way to improve the performance of magnesia materials, especially magnesia castables.
发明内容Contents of the invention
本发明旨在克服现有技术不足，目的是提供一种氧化镁材料的制备方法，用该方法制备的氧化镁材料抗水化性能好、高温性能稳定、高温强度大和耐侵蚀性优良，是高温工业用高级耐火材料的新型原料。The purpose of the present invention is to overcome the deficiencies of the prior art, and the purpose is to provide a preparation method of magnesia material. The magnesia material prepared by the method has good hydration resistance, stable high-temperature performance, high-temperature strength and excellent corrosion resistance, and is a high-temperature A new type of raw material for industrial advanced refractories.
为实现上述目的，本发明所采用的技术方案是：先按氧化镁细粉和混合溶液的质量比为1∶2配料，置于混合机中共混0.5～8小时，得混合浆料；再将混合浆料滤干，在110℃条件下干燥24小时，得到混合料块；然后将混合料块于1000～1300℃条件下保温1～6小时，冷却，球磨至1～200μm，即得氧化铝材料。In order to achieve the above object, the technical scheme adopted in the present invention is: firstly, the mass ratio of magnesium oxide fine powder and mixed solution is 1: 2 ingredients, placed in a mixer and blended for 0.5 to 8 hours to obtain a mixed slurry; The mixed slurry is filtered and dried at 110°C for 24 hours to obtain a mixed block; then the mixed block is kept at 1000-1300°C for 1-6 hours, cooled, and ball milled to 1-200 μm to obtain alumina Material.
所述混合溶液为氢氧化铍和草酸溶液的混合溶液，其中：氢氧化铍为5～30wt％，草酸溶液为70～95wt％。The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein the content of beryllium hydroxide is 5-30wt%, and the oxalic acid solution is 70-95wt%.
所述氧化镁细粉中MgO含量≥95wt％；粒径为1～200μm。The MgO content in the magnesium oxide fine powder is more than or equal to 95% by weight; the particle size is 1-200 μm.
所述氢氧化铍中Be(OH)2含量≥97wt％；粒径为1～500μm。The content of Be(OH) 2 in the beryllium hydroxide is more than or equal to 97wt%; the particle size is 1-500 μm.
所述草酸溶液的摩尔浓度为0.2～1mol/L。The molar concentration of the oxalic acid solution is 0.2-1 mol/L.
由于采用上述技术方案，本发明与现有技术相比具有如下积极效果：Owing to adopting above-mentioned technical scheme, the present invention has following positive effect compared with prior art:
本发明于高温制备时，在共混过程中包裹与氧化镁颗粒表面的Be(OH)2会分解形成BeO，即MgO颗粒表面将包裹一薄层BeO。BeO高温稳定性比MgO要好，甚至优于ZrO2，高温稳定性极好。BeO层的存在，可以带来如下良好的效果：When the present invention is prepared at high temperature, the Be(OH) 2 coated on the surface of magnesium oxide particles will be decomposed to form BeO during the blending process, that is, a thin layer of BeO will be wrapped on the surface of MgO particles. The high temperature stability of BeO is better than that of MgO, even better than that of ZrO 2 , and the high temperature stability is excellent. The existence of the BeO layer can bring the following good effects:
1)制备浇注料时，BeO层将氧化镁材料和水隔离，能保护氧化镁颗粒免于水化，避免因氧化镁颗粒水化后在其表面形成的Mg(OH)2于预热过程中导致材料开裂的现象；1) When preparing castables, the BeO layer isolates the magnesium oxide material from water, which can protect the magnesium oxide particles from hydration, and avoid the Mg(OH) 2 formed on the surface of the magnesium oxide particles after hydration in the preheating process Phenomena that lead to cracking of the material;
2)BeO层将氧化镁材料和其它杂质氧化物隔离，避免高温下产生过多的低熔点物相，有利于提高镁质材料的荷重软化温度。2) The BeO layer isolates the magnesium oxide material from other impurity oxides, avoids excessive low melting point phases at high temperatures, and is beneficial to increase the load softening temperature of the magnesium material.
本发明制备的氧化镁材料经检测：MgO含量≥94wt％；显气孔率≤4％。The magnesium oxide material prepared by the invention is tested: the content of MgO is more than 94% by weight; the apparent porosity is less than or equal to 4%.
因此，本发明所制备的氧化镁材料具有抗水化性能好、高温性能稳定、高温强度大和耐侵蚀形优良的特点，是制备高温工业用高级耐火材料的新型原料。Therefore, the magnesium oxide material prepared by the present invention has the characteristics of good hydration resistance, stable high-temperature performance, high-temperature strength and excellent erosion resistance, and is a new type of raw material for preparing high-grade refractory materials for high-temperature industries.
具体实施方式detailed description
下面结合具体实施方式对本发明做进一步的描述，并非对其保护范围的限制。The present invention will be further described below in combination with specific embodiments, which are not intended to limit the protection scope thereof.
为避免重复，现将本具体实施方式所涉及的技术参数统一描述如下，实施例中不再赘述：In order to avoid repetition, the technical parameters involved in this specific embodiment are now described in a unified manner as follows, and will not be repeated in the embodiments:
所述氧化镁细粉中MgO含量≥95wt％；粒径为1～200μm。The MgO content in the magnesium oxide fine powder is more than or equal to 95% by weight; the particle size is 1-200 μm.
所述氢氧化铍中Be(OH)2含量≥97wt％；粒径为1～500μm。The content of Be(OH) 2 in the beryllium hydroxide is more than or equal to 97wt%; the particle size is 1-500 μm.
所述草酸溶液的摩尔浓度为0.2～1mol/L。The molar concentration of the oxalic acid solution is 0.2-1 mol/L.
实施例1Example 1
一种氧化镁材料及其制备方法。先按氧化镁细粉和混合溶液的质量比为1∶2配料，置于混合机中共混0.5～3小时，得混合浆料；再将混合浆料滤干，在110℃条件下干燥24小时，得到混合料块；然后将混合料块于1100～1300℃条件下保温1～3小时，冷却，球磨至1～100μm，即得氧化铝材料。A magnesium oxide material and a preparation method thereof. First, the mass ratio of magnesium oxide fine powder and mixed solution is 1:2, put in a mixer and mix for 0.5 to 3 hours to obtain a mixed slurry; then filter the mixed slurry and dry it at 110°C for 24 hours , to obtain a mixture block; then heat the mixture block at 1100-1300° C. for 1-3 hours, cool, and ball mill to 1-100 μm to obtain an alumina material.
所述混合溶液为氢氧化铍和草酸溶液的混合溶液，其中：氢氧化铍为5～10wt％，草酸溶液为90～95wt％。The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein the content of beryllium hydroxide is 5-10wt%, and the oxalic acid solution is 90-95wt%.
本实施例制备的氧化镁材料经检测：MgO含量≥94wt％；显气孔率≤4％。The magnesium oxide material prepared in this example is tested: MgO content ≥ 94 wt %; apparent porosity ≤ 4%.
实施例2Example 2
一种氧化镁材料及其制备方法。先按氧化镁细粉和混合溶液的质量比为1∶2配料，置于混合机中共混3～6小时，得混合浆料；再将混合浆料滤干，在110℃条件下干燥24小时，得到混合料块；然后将混合料块于1100～1200℃条件下保温3～5小时，冷却，球磨至100～150μm，即得氧化铝材料。A magnesium oxide material and a preparation method thereof. Firstly, the mass ratio of magnesium oxide fine powder and mixed solution is 1:2, and mixed in a mixer for 3 to 6 hours to obtain a mixed slurry; then the mixed slurry is filtered and dried at 110°C for 24 hours , to obtain a mixture block; then heat the mixture block at 1100-1200° C. for 3-5 hours, cool, and ball mill to 100-150 μm to obtain an alumina material.
所述混合溶液为氢氧化铍和草酸溶液的混合溶液，其中：氢氧化铍为10～20wt％，草酸溶液为80～90wt％。The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein: the beryllium hydroxide is 10-20 wt%, and the oxalic acid solution is 80-90 wt%.
本实施例制备的氧化镁材料经检测：MgO含量≥95wt％；显气孔率≤3％。The magnesium oxide material prepared in this example is tested: MgO content ≥ 95 wt %; apparent porosity ≤ 3%.
实施例3Example 3
一种氧化镁材料及其制备方法。先按氧化镁细粉和混合溶液的质量比为1∶2配料，置于混合机中共混6～8小时，得混合浆料；再将混合浆料滤干，在110℃条件下干燥24小时，得到混合料块；然后将混合料块于1200～1300℃条件下保温5～6小时，冷却，球磨至1～200μm，即得氧化铝材料。A magnesium oxide material and a preparation method thereof. Firstly, the mass ratio of magnesium oxide fine powder and mixed solution is 1:2, and mixed in a mixer for 6-8 hours to obtain a mixed slurry; then the mixed slurry is filtered and dried at 110°C for 24 hours , to obtain a mixture block; then heat the mixture block at 1200-1300° C. for 5-6 hours, cool, and ball mill to 1-200 μm to obtain an alumina material.
所述混合溶液为氢氧化铍和草酸溶液的混合溶液，其中：氢氧化铍为20～30wt％，草酸溶液为70～80wt％。The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein: the beryllium hydroxide is 20-30 wt%, and the oxalic acid solution is 70-80 wt%.
本实施例制备的氧化镁材料经检测：MgO含量≥98wt％；显气孔率≤2％。The magnesium oxide material prepared in this example is tested: MgO content ≥ 98wt%; apparent porosity ≤ 2%.
本具体实施方式与现有技术相比具有如下积极效果：Compared with the prior art, this specific embodiment has the following positive effects:
本具体实施方式制备的氧化镁材料在共混过程中，包裹与氧化镁颗粒表面的Be(OH)2会分解形成BeO，即MgO颗粒表面将包裹一薄层BeO。BeO高温稳定性比MgO要好，甚至优于ZrO2，高温稳定性极好。BeO层的存在，可以带来如下良好的效果：During the blending process of the magnesium oxide material prepared in this specific embodiment, the Be(OH) 2 wrapped on the surface of the magnesium oxide particles will be decomposed to form BeO, that is, a thin layer of BeO will be wrapped on the surface of the MgO particles. The high temperature stability of BeO is better than that of MgO, even better than that of ZrO 2 , and the high temperature stability is excellent. The existence of the BeO layer can bring the following good effects:
1)制备浇注料时，BeO层将氧化镁材料和水隔离，能保护氧化镁颗粒免于水化，避免因氧化镁颗粒水化后在其表面形成的Mg(OH)2于预热过程中导致材料开裂的现象；1) When preparing castables, the BeO layer isolates the magnesium oxide material from water, which can protect the magnesium oxide particles from hydration, and avoid the Mg(OH) 2 formed on the surface of the magnesium oxide particles after hydration in the preheating process Phenomena that lead to cracking of the material;
2)BeO层将氧化镁材料和其它杂质氧化物隔离，避免高温下产生过多的低熔点物相，有利于提高镁质材料的荷重软化温度。2) The BeO layer isolates the magnesium oxide material from other impurity oxides, avoids excessive low melting point phases at high temperatures, and is beneficial to increase the load softening temperature of the magnesium material.
本具体实施方式制备的氧化镁材料经检测：MgO含量≥94wt％；显气孔率≤4％。The magnesium oxide material prepared in this specific embodiment is tested: MgO content ≥ 94wt%; apparent porosity ≤ 4%.
因此，本具体实施方式所制备的氧化镁材料具有抗水化性能好、高温性能稳定、高温强度大和耐侵蚀形优良的特点，是制备高温工业用高级耐火材料的新型原料。Therefore, the magnesium oxide material prepared in this specific embodiment has the characteristics of good hydration resistance, stable high-temperature performance, high-temperature strength and excellent corrosion resistance, and is a new type of raw material for preparing high-grade refractory materials for high-temperature industries.
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