CN112456984A - 一种钢包包底用镁尖晶石质浇注料及其制备方法 - Google Patents
一种钢包包底用镁尖晶石质浇注料及其制备方法 Download PDFInfo
- Publication number
- CN112456984A CN112456984A CN202011416866.2A CN202011416866A CN112456984A CN 112456984 A CN112456984 A CN 112456984A CN 202011416866 A CN202011416866 A CN 202011416866A CN 112456984 A CN112456984 A CN 112456984A
- Authority
- CN
- China
- Prior art keywords
- ladle
- fine powder
- parts
- magnesium spinel
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
-
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3218—Aluminium (oxy)hydroxides, e.g. boehmite, gibbsite, alumina sol
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5212—Organic
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Products (AREA)
Abstract
本发明涉及一种钢包包底用镁尖晶石质浇注料及其制备方法,按重量份包括以下原料:烧结刚玉颗粒50‑60份;烧结刚玉细粉15‑25份;镁铝尖晶石细粉10‑20份;活性氧化铝细粉3‑5份;有机纤维1‑1.5份;铝溶胶2‑4份;聚羧酸盐0.05‑1份。优点是:具有优良的热震稳定性、低侵蚀性,使用寿命有较大幅度提高。采用铝溶胶作为结合剂,能够减少引入的氧化钙杂质。
Description
技术领域
本发明涉及一种钢包包底用镁尖晶石质浇注料及其制备方法。
背景技术
随着钢铁冶炼技术的不断进步,特别是一些高附加值的品种钢冶炼量增多,使得炉外精炼在冶炼过程中所占比重越来越大。随着冶炼温度提高、洁净钢和高品质钢需求的不断增长,炉外精炼比例增大,时间延长,钢包容易损毁,且钢包底部是钢包损毁最严重的部位之一。近年来,国内外许多钢厂为实现钢包使用寿命的稳定化,钢包施工的省力化和降低耐火材料消耗,在钢包包底使用了刚玉-尖晶石浇注料。
发明内容
为克服现有技术的不足,本发明的目的是提供一种钢包包底用镁尖晶石质浇注料及其制备方法,增强热震稳定性,使Al2O3-Mg系包底浇注料的抗渗透、耐侵蚀性能与抗剥落性能同时得到提高,最终实现提高使用寿命之目的。
为实现上述目的,本发明通过以下技术方案实现:
一种钢包包底用镁尖晶石质浇注料,按重量份包括以下原料:
所述的烧结刚玉中各元素按重量份包括:
Al2O3 81wt%-88wt%;Si 4wt%-5wt%;Al 4wt%-5wt%;Fe≤1wt%;Ti 3wt%-5wt%;酚醛树脂1wt%-3wt%。
所述的镁铝尖晶石细粉中氧化铝重量百分比为80%-90%,氧化镁的重量百分比为10%-20%;粒度为200目。
所述的烧结刚玉的体积密度≥3.65g/cm3,显气孔率≤3%,Al2O3含量≥99.00%。
所述的活性氧化铝微粉中Al2O3含量≥99.00%,粒径D50为0.5-2μm。
所述的铝溶胶的固含量为10%-30%
所述的有机纤维为丙纶纤维、涤纶纤维或聚酰亚胺纤维。
所述的烧结刚玉颗粒的粒径为5-3mm;烧结刚玉细粉的粒度为200目。
一种钢包包底用镁尖晶石质浇注料的制备方法,包括以下步骤:
1)将烧结刚玉颗粒、烧结刚玉细粉、镁铝尖晶石细粉、活性氧化铝细粉、有机纤维按所述重量份混合搅匀;
2)向混合料中加入铝溶胶、聚羧酸盐,再向其中混入混合料的5-7wt%的水,搅匀,净混时间不低于15min,出料;
3)将出料产品装入袋中,置于干燥处密封保存。
与现有技术相比,本发明的有益效果是:
钢包包底用镁尖晶石质浇注料具有优良的热震稳定性、低侵蚀性,使用寿命有较大幅度提高。采用铝溶胶作为结合剂,能够减少引入的氧化钙杂质,同时以烧结刚玉为骨料,使得到的钢包包底用镁尖晶石质浇注料具有良好的抗侵蚀性能,且更耐烧氧。且烧结刚玉中Si、Al均匀分散于Al2O3晶格之间,晶界数量多,热震稳定性能优良;添加Ti、Fe元素在制砖过程中还可作为烧结助剂,使钢包包底使用寿命延长。铝溶胶中的纳米氧化铝微粒分散均匀,得到的浇注料结合效果更好。采用了镁铝尖晶石,尖晶石能吸收钢水中钢渣中的Mn2+、Fe2+等二价离子,从而使钢渣的黏度变大,有效提高钢包包底抗渣侵蚀性能,提高高温抗折强度,从而提高钢包的抗渗漏性能。镁铝尖晶石、活性氧化铝粉、有机纤维共存的结合在高温下形成微通道网络,在使用时,贯通微通道网络具有惯性阻力,不易渗渣,降低钢包自身温差和气固界面温度梯度。
具体实施方式
下面结合对本发明进行详细地描述,但是应该指出本发明的实施不限于以下的实施方式。
实施例1-6:
钢包包底用镁尖晶石质浇注料的制备方法包括以下步骤:
1)按照如表1所示的各成分重量份称取烧结刚玉颗粒、烧结刚玉细粉、镁铝尖晶石细粉、活性氧化铝细粉、有机纤维;
其中,镁铝尖晶石细粉中氧化铝重量百分比为80%-90%,氧化镁的重量百分比为10%-20%;粒度为200目。烧结刚玉的体积密度≥3.65g/cm3,显气孔率≤3%,Al2O3含量≥99.00%。活性氧化铝微粉中Al2O3含量≥99.00%,粒径D50为0.5-2μm。铝溶胶的固含量为10%-30%。有机纤维为丙纶纤维、涤纶纤维或聚酰亚胺纤维。烧结刚玉颗粒的粒径为5-3mm;烧结刚玉细粉的粒度为200目。
2)向混合料中加入铝溶胶、聚羧酸盐,再向其中混入混合料的5-7wt%的水,搅匀,净混时间不低于15min,检验合格后出料;
3)将出料产品装入袋中,置于干燥处密封保存。
表1
组分 | 实施例1 | 实施例2 | 实施例3 | 实施例4 | 实施例5 | 实施例6 |
烧结刚玉颗粒 | 50 | 52 | 53 | 55 | 58 | 60 |
烧结刚玉细粉 | 15 | 20 | 12 | 18 | 16 | 16 |
活性氧化铝细粉 | 3 | 4 | 4 | 3 | 5 | 4 |
丙纶纤维 | 1.2 | 1 | 1.2 | |||
涤纶纤维 | 1.5 | 1.2 | ||||
聚酰亚胺纤维 | 1.4 | |||||
铝溶胶 | 20%/2 | 15%/3 | 25%/2 | 20%/4 | 15%/3 | 15%/4 |
聚羧酸盐 | 0.06 | 0.08 | 0.06 | 0.09 | 0.05 | 0.08 |
表1中粒径均为粒径D 50粒径,铝溶胶一行中,“/”前后分别为铝溶胶中的固含量和铝溶胶的重量份。其中,烧结刚玉中各元素按重量份包括:Al2O3 81wt%-88wt%;Si4wt%-5wt%;Al 4wt%-5wt%;Fe≤1wt%;Ti 3wt%-5wt%;酚醛树脂1wt%-3wt%。
上述实施例所采用的烧结刚玉的生产方法,包括以下步骤:
1)将煅烧高岭土研磨至300-600目,并检测其中的SiO2、Fe2O3、TiO2的含量,加入Al粉,Al粉的质量依据目标产物中Si、Al量根据质量守恒定律算得。
2)将上述原料加入内有刚玉球的球磨机中进行干磨,干磨2-3h后放料;
3)得到的混合物料加入湿辗机或强制式搅拌机,向混合粉料中加入酚醛树脂混5-10min,避免Al的水化氧化;
4)将步骤3)得到的混料在100-150MPa下压坯,得到的坯体装入隧道窑车或入倒焰窑中,以30-50℃/h的升温速率对坯体焙烧,烧至1500-1550℃,保温2-8h后进行冷却,对冷却后的坯体进行破碎、磨粉。
对成品浇注料进行测试,见表2。
表2
可见本发明的钢包包底用镁尖晶石质浇注料具有优良的热震稳定性、低侵蚀性,使用寿命有较大幅度提高。
Claims (9)
2.根据权利要求1所述的一种钢包包底用镁尖晶石质浇注料,其特征在于,所述的烧结刚玉中各元素按重量份包括:
Al2O3 81wt%-88wt%;Si 4wt%-5wt%;Al 4wt%-5wt%;Fe≤1wt%;Ti 3wt%-5wt%;酚醛树脂1wt%-3wt%。
3.根据权利要求1所述的一种钢包包底用镁尖晶石质浇注料,其特征在于,所述的镁铝尖晶石细粉中氧化铝重量百分比为80%-90%,氧化镁的重量百分比为10%-20%;粒度为200目。
4.根据权利要求1所述的一种钢包包底用镁尖晶石质浇注料,其特征在于,所述的烧结刚玉的体积密度≥3.65g/cm3,显气孔率≤3%,Al2O3含量≥99.00%。
5.根据权利要求1所述的一种钢包包底用镁尖晶石质浇注料,其特征在于,所述的活性氧化铝微粉中Al2O3含量≥99.00%,粒径D50为0.5-2μm。
6.根据权利要求1所述的一种钢包包底用镁尖晶石质浇注料,其特征在于,所述的铝溶胶的固含量为10%-30%。
7.根据权利要求1所述的一种钢包包底用镁尖晶石质浇注料,其特征在于,所述的有机纤维为丙纶纤维、涤纶纤维或聚酰亚胺纤维。
8.根据权利要求1所述的一种钢包包底用镁尖晶石质浇注料,其特征在于,所述的烧结刚玉颗粒的粒径为5-3mm;烧结刚玉细粉的粒度为200目。
9.根据权利要求1-8任意一项所述的一种钢包包底用镁尖晶石质浇注料的制备方法,其特征在于,包括以下步骤:
1)将烧结刚玉颗粒、烧结刚玉细粉、镁铝尖晶石细粉、活性氧化铝细粉、有机纤维按所述重量份混合搅匀;
2)向混合料中加入铝溶胶、聚羧酸盐,再向其中混入混合料的5-7wt%的水,搅匀,净混时间不低于15min,出料;
3)将出料产品装入袋中,置于干燥处密封保存。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011416866.2A CN112456984A (zh) | 2020-12-07 | 2020-12-07 | 一种钢包包底用镁尖晶石质浇注料及其制备方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011416866.2A CN112456984A (zh) | 2020-12-07 | 2020-12-07 | 一种钢包包底用镁尖晶石质浇注料及其制备方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
CN112456984A true CN112456984A (zh) | 2021-03-09 |
Family
ID=74801499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202011416866.2A Withdrawn CN112456984A (zh) | 2020-12-07 | 2020-12-07 | 一种钢包包底用镁尖晶石质浇注料及其制备方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN112456984A (zh) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5932506A (en) * | 1998-02-23 | 1999-08-03 | Bogan; Jeffrey E. | Alumina-silicon carbide-carbon refractory castable containing magnesium aluminate spinel |
CN102718512A (zh) * | 2012-06-28 | 2012-10-10 | 洛阳利尔耐火材料有限公司 | 一种抗热震刚玉-尖晶石质耐火浇注料及其制备方法 |
CN103482989A (zh) * | 2013-09-06 | 2014-01-01 | 浙江自立股份有限公司 | 刚玉镁铝尖晶石浇注料以及使用浇注料制备预制砖的方法 |
CN103979992A (zh) * | 2014-06-09 | 2014-08-13 | 武汉科技大学 | 一种钢包透气砖及其制备方法 |
CN105036773A (zh) * | 2015-08-03 | 2015-11-11 | 丹东播磨耐火材料有限公司 | 钢包包底浇注料 |
CN105645979A (zh) * | 2016-01-15 | 2016-06-08 | 浙江自立高温科技有限公司 | 一种钢包透气砖及其制备方法 |
CN108585882A (zh) * | 2018-05-15 | 2018-09-28 | 李明建 | 一种功能烧结刚玉的原料及其生产方法 |
CN109608174A (zh) * | 2019-01-09 | 2019-04-12 | 武汉科技大学 | 可水合氧化铝结合刚玉-尖晶石浇注料及其制备方法 |
-
2020
- 2020-12-07 CN CN202011416866.2A patent/CN112456984A/zh not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5932506A (en) * | 1998-02-23 | 1999-08-03 | Bogan; Jeffrey E. | Alumina-silicon carbide-carbon refractory castable containing magnesium aluminate spinel |
CN102718512A (zh) * | 2012-06-28 | 2012-10-10 | 洛阳利尔耐火材料有限公司 | 一种抗热震刚玉-尖晶石质耐火浇注料及其制备方法 |
CN103482989A (zh) * | 2013-09-06 | 2014-01-01 | 浙江自立股份有限公司 | 刚玉镁铝尖晶石浇注料以及使用浇注料制备预制砖的方法 |
CN103979992A (zh) * | 2014-06-09 | 2014-08-13 | 武汉科技大学 | 一种钢包透气砖及其制备方法 |
CN105036773A (zh) * | 2015-08-03 | 2015-11-11 | 丹东播磨耐火材料有限公司 | 钢包包底浇注料 |
CN105645979A (zh) * | 2016-01-15 | 2016-06-08 | 浙江自立高温科技有限公司 | 一种钢包透气砖及其制备方法 |
CN108585882A (zh) * | 2018-05-15 | 2018-09-28 | 李明建 | 一种功能烧结刚玉的原料及其生产方法 |
CN109608174A (zh) * | 2019-01-09 | 2019-04-12 | 武汉科技大学 | 可水合氧化铝结合刚玉-尖晶石浇注料及其制备方法 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN107805058B (zh) | 一种钢包用刚玉质包底砖及其制备方法 | |
CN107473759B (zh) | 一种均化料增韧的铝碳下水口砖及其生产方法 | |
US10519065B2 (en) | Lightweight micro-closed-pore corundum composite refractory, method for preparing the same | |
CN101613207A (zh) | 一种精炼钢包用低碳刚玉尖晶石砖及其制备方法 | |
KR20130093609A (ko) | 크롬 옥사이드 파우더 | |
CN106588059B (zh) | 一种石灰回转窑用预制件及其制备方法 | |
CN107805059A (zh) | 一种钢包底座砖及其制备方法 | |
CN108083765B (zh) | 低导热抗剥落砖及其制备方法 | |
CN101602595A (zh) | 硅溶胶结合刚玉浇注料及制备耐磨预制件的方法 | |
CN111253164A (zh) | 钢包永久层用轻质耐火砖 | |
CN113800895A (zh) | 一种耐磨锆铝复合球及制备方法 | |
CN113233908A (zh) | 一种再生无碳砖及其制备方法 | |
CN110483023B (zh) | 一种微孔化刚玉砖及其制备方法 | |
EP4349797A1 (en) | Ca6-based refractory material with medium volume density, preparation method therefor, and use thereof | |
CN112194471A (zh) | 一种超低气孔高铝砖及其制备工艺 | |
CN109970459B (zh) | 一种柱状莫来石高耐磨砖及其制备方法 | |
CN113968724B (zh) | 一种金属改性镁砂、低碳转炉镁质滑板及它们的制备方法 | |
CN114163228A (zh) | 一种铝钙碳质转炉挡渣滑板及其制备方法 | |
CN113061045B (zh) | 一种水泥窑烧成带用镁铁锌铝复合尖晶石耐火砖及其制备方法 | |
CN106699142B (zh) | 一种浇注高锰钢用金属铝结合无硅低碳铝锆碳滑板及其生产方法 | |
CN107043265B (zh) | 一种冶金、有色熔炼炉用不烧镁铬砖及其制备方法 | |
CN112745134A (zh) | 一种含刚玉陶瓷球的透气砖及其制备方法 | |
CN112960973A (zh) | 用于高温合金真空熔炼的高纯板状刚玉坩埚及其制备方法 | |
CN109180205B (zh) | 一种铬铁矿耐火材料及其制备方法 | |
CN107473719A (zh) | 一种低碳高强耐火材料及其制备工艺 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
WW01 | Invention patent application withdrawn after publication | ||
WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210309 |