CN107382333A - 一种抗渣钢包浇注料的制备方法 - Google Patents
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Abstract
本发明公开了一种抗渣钢包浇注料的制备方法,属于不定形耐火材料制备技术领域。本发明将铝矾土、白刚玉硅等为原料制得混合稀浆液,并将聚氨酯海绵用混合稀浆液浸泡后保温烧结,制得多孔基体,随后将八水合氧氯化锆、萤石等混磨过筛后与乙酰丙酮混合分散,将混合分散液加热反应得混合反应液,再将其过滤后将滤饼干燥碾磨,得改性粉末后与石英、钠长石等混磨过筛,得球磨釉料粉末,并与去离子水、聚乙烯醇溶液混合分散,得釉料分散液,并用其浸泡多孔基体,最后取出基体烧结冷却,即可得抗渣钢包浇注料,本发明制得的钢包浇注料具有较好的抗渣侵蚀性能,能有效延长钢包使用寿命,是一种理想的不定形耐火材料。
Description
技术领域
本发明公开了一种抗渣钢包浇注料的制备方法,属于不定形耐火材料制备技术领域。
背景技术
钢包作为钢铁生产过程尤其是短流程炼钢中一个重要设备,是炼钢和连铸之间的中间容器。钢液由加热容器出钢至绕筑过程结束都盛装在钢包内。而出于连铸钢材的质量要求,进入中间包的钢液需要一定的温度,而钢包的保温效果决定了转炉出钢温度和钢包、中间包加热的能耗。钢包的浇注料对于钢液的保温起到主要作用,所以钢包浇注料的热稳定性参数的优化是转炉炼钢节能的重要途径。
钢包浇注料是不定性耐火材料的一种,具有良好的流动性,作为钢包内衬的永久层使用时,可提高钢包的保温性能。现有钢包浇注料通常采用的材质有刚玉质、尖晶石质、高铝质、莫来石质等,钢包浇注料不仅承担容器作用,还参与冶炼过程的物理和化学反应,对钢的质量有重要影响。目前,与炉渣接触的钢包浇注料易受到炉渣的侵蚀和渗透的影响,一方面,与炉渣接触的耐火材料会溶解到熔渣以及钢水中,另一方面,炉渣的渗透也会导致钢包浇注料发生变质甚至剥落。这不仅会影响钢包浇注料的服役寿命,而且也会因钢包浇注料的蚀损影响钢水的品质。因此开发出抗渣性能优良、稳定的钢包浇注料,是本领域技术人员的关注重点之一。
申请号CN104418598A公开了一种钢包用耐火浇注料,其以高铝熟料、矾土水泥、硅微粉、氧化铝和电熔镁砂为原料制备了一种钢包用耐火浇注料,所制备的钢包用耐火浇注料虽然具有成本低的优点,但是单纯依靠耐火原料的的抗渣能力,浇注料不具有理想的抗渣性能,寿命较短。
综上所述,开发一种抗渣性能优异,使用寿命较长的钢包浇注料成为业内亟待解决的问题。
发明内容
本发明主要解决的技术问题:针对现有钢包浇注料抗渣性能不理想,使用寿命较短的缺陷,提供了一种抗渣钢包浇注料的制备方法。
为了解决上述技术问题,本发明所采用的技术方案是:
(1)按重量份数计,分别称量45~50份铝矾土、15~20份白刚玉、5~10份铝酸钙水泥、3~5份氧化铝和1~2份硅微粉混合并球磨过200目筛得混合粉末,按质量比1:15,将混合粉末与去离子水混合,得混合稀浆液,取聚氨酯海绵,将其浸泡至混合稀浆液中,随后取出并保温烧结,静置冷却至室温,得多孔基体;
(2)按质量比1:10:50,将八水合氧氯化锆、六水合硝酸钇和萤石混合,球磨过200目筛得混合粉末,按质量比1:10,将混合粉末与乙酰丙酮混合,超声分散得混合分散液,将混合分散液置于反应釜中,保温加热反应后静置冷却至室温,得混合反应液;
(3)对混合反应液过滤,得滤饼,洗涤干燥并碾磨,得改性粉末,按重量份数计分别称量10~15份石英、6~8份钠长石、3~5份石灰石、5~7份高岭土和5~8份改性粉末混合,球磨过250目筛,得球磨釉料粉末;
(4)按重量份数计,分别称量65~70份去离子水、15~20份质量分数10%聚乙烯醇溶液和8~10份球磨釉料粉末搅拌混合,超声分散得釉料分散液,按质量比1:10,将多孔基体浸泡至釉料分散液中,浸泡处理后取出基体,预热后程序升温,保温烧结后静置冷却至室温,即可制备得一种抗渣钢包浇注料。
步骤(1)所述的保温烧结温度为650~700℃。
步骤(3)所述的洗涤是采用无水乙醇洗涤3~5次。
步骤(4)所述的程序升温为按8℃/min升温至850~900℃。
本发明的有益效果是:
(1)本发明通过制备多孔基体,再通过将萤石颗粒作为釉料层涂覆并烧结至材料表面,使其在孔道内部形成包覆的孔道釉层,由于萤石的掺入,降低基体材料孔道的表面能,使熔渣不易负载和渗透至材料内部;
(2)本发明以氧氯化锆和硝酸钇为原料制备氧化锆作为保护层,使其在材料表面形成致密的保护层,由于材料中的ZrO2与渣中的氧化钙反应生成CaZrO3达到一定程度后,与CaO反应首先生成Ca6Zr19O44化合物,但该化合物并不稳定,随着ZrO2溶解量增加,ZrO2即与氧化锆反应生成CaZrO3,由于CaZrO3为高熔点化合物,在渣中以固体的形式存在,CaZrO3—旦生成,便会作为晶种促进其余的CaZrO3链式的形式快速形成、长大,溶解在渣中的ZrO2与氧化钙反应生成CaZrO3致密层,与负载的萤石颗粒协同作用,阻止熔渣的负载和对材料内部的渗透。
具体实施方式
按重量份数计,分别称量45~50份铝矾土、15~20份白刚玉、5~10份铝酸钙水泥、3~5份氧化铝、1~2份硅微粉混合并置于球磨罐中,控制球磨速率为350~400r/min,待球磨3~5h后,过200目筛得混合粉末,按质量比1:15,将混合粉末与去离子水混合,在室温下搅拌10~15min后,再在200~300W下超声分散10~15min,制备得混合稀浆液,取聚氨酯海绵,将其置于混合稀浆液中,将海绵浸没至浆液液面以下,浸泡处理5~10min后,取出并置于125~130℃下马弗炉中,预热25~30min后,再按15℃/min升温至650~700℃,保温烧结2~3h后,静置冷却至室温,用去离子水冲洗3~5次后,在85~90℃下干燥6~8h,制备得多孔基体,按质量比1:10:50,将八水合氧氯化锆、六水合硝酸钇和萤石混合,在室温下置于350~400r/min下球磨3~5h,过200目筛得混合粉末,按质量比1:10,将混合粉末与乙酰丙酮混合并置于200~300W下超声分散10~15min,得混合分散液,将混合分散液置于反应釜中,在200~220℃下保温加热反应10~12h,静置冷却至室温得混合反应液,过滤得滤饼,用无水乙醇洗涤3~5次后真空干燥并碾磨,得改性粉末;按重量份数计分别称量10~15份石英、6~8份钠长石、3~5份石灰石、5~7份高岭土和5~8份改性粉末混合,球磨过250目筛,得球磨釉料粉末,按重量份数计,分别称量65~70份去离子水、15~20份质量分数10%聚乙烯醇溶液和8~10份球磨釉料粉末搅拌混合,超声分散处理得釉料分散液,按质量比1:10,将多孔基体浸泡至釉料分散液中,浸泡处理10~12h后,取出基体并置于120~150℃马弗炉中,预热10~15min后,再按8℃/min升温至850~900℃,保温烧结1~2h后,静置冷却至室温,即可制备得一种抗渣钢包浇注料。
实例1
按重量份数计,分别称量45份铝矾土、15份白刚玉、5份铝酸钙水泥、3份氧化铝、1份硅微粉混合并置于球磨罐中,控制球磨速率为350r/min,待球磨3h后,过200目筛得混合粉末,按质量比1:15,将混合粉末与去离子水混合,在室温下搅拌10min后,再在200W下超声分散10min,制备得混合稀浆液,取聚氨酯海绵,将其置于混合稀浆液中,将海绵浸没至浆液液面以下,浸泡处理5min后,取出并置于125℃下马弗炉中,预热25min后,再按15℃/min升温至650℃,保温烧结2h后,静置冷却至室温,用去离子水冲洗3次后,在85℃下干燥6h,制备得多孔基体,按质量比1:10:50,将八水合氧氯化锆、六水合硝酸钇和萤石混合,在室温下置于350r/min下球磨3h,过200目筛得混合粉末,按质量比1:10,将混合粉末与乙酰丙酮混合并置于200W下超声分散10min,得混合分散液,将混合分散液置于反应釜中,在200℃下保温加热反应10h,静置冷却至室温得混合反应液,过滤得滤饼,用无水乙醇洗涤3次后真空干燥并碾磨,得改性粉末;按重量份数计分别称量10份石英、6份钠长石、3份石灰石、5份高岭土和5份改性粉末混合,球磨过250目筛,得球磨釉料粉末,按重量份数计,分别称量65份去离子水、15份质量分数10%聚乙烯醇溶液和8份球磨釉料粉末搅拌混合,超声分散处理得釉料分散液,按质量比1:10,将多孔基体浸泡至釉料分散液中,浸泡处理10h后,取出基体并置于120℃马弗炉中,预热10min后,再按8℃/min升温至850℃,保温烧结1h后,静置冷却至室温,即可制备得一种抗渣钢包浇注料。
实例2
按重量份数计,分别称量48份铝矾土、18份白刚玉、8份铝酸钙水泥、4份氧化铝、1份硅微粉混合并置于球磨罐中,控制球磨速率为375r/min,待球磨4h后,过200目筛得混合粉末,按质量比1:15,将混合粉末与去离子水混合,在室温下搅拌13min后,再在250W下超声分散13min,制备得混合稀浆液,取聚氨酯海绵,将其置于混合稀浆液中,将海绵浸没至浆液液面以下,浸泡处理8min后,取出并置于128℃下马弗炉中,预热28min后,再按15℃/min升温至675℃,保温烧结2h后,静置冷却至室温,用去离子水冲洗4次后,在88℃下干燥7h,制备得多孔基体,按质量比1:10:50,将八水合氧氯化锆、六水合硝酸钇和萤石混合,在室温下置于375r/min下球磨4h,过200目筛得混合粉末,按质量比1:10,将混合粉末与乙酰丙酮混合并置于250W下超声分散13min,得混合分散液,将混合分散液置于反应釜中,在210℃下保温加热反应11h,静置冷却至室温得混合反应液,过滤得滤饼,用无水乙醇洗涤4次后真空干燥并碾磨,得改性粉末;按重量份数计分别称量13份石英、7份钠长石、4份石灰石、6份高岭土和7份改性粉末混合,球磨过250目筛,得球磨釉料粉末,按重量份数计,分别称量68份去离子水、18份质量分数10%聚乙烯醇溶液和9份球磨釉料粉末搅拌混合,超声分散处理得釉料分散液,按质量比1:10,将多孔基体浸泡至釉料分散液中,浸泡处理11h后,取出基体并置于135℃马弗炉中,预热13min后,再按8℃/min升温至875℃,保温烧结1h后,静置冷却至室温,即可制备得一种抗渣钢包浇注料。
实例3
按重量份数计,分别称量50份铝矾土、20份白刚玉、10份铝酸钙水泥、5份氧化铝、2份硅微粉混合并置于球磨罐中,控制球磨速率为400r/min,待球磨5h后,过200目筛得混合粉末,按质量比1:15,将混合粉末与去离子水混合,在室温下搅拌15min后,再在300W下超声分散15min,制备得混合稀浆液,取聚氨酯海绵,将其置于混合稀浆液中,将海绵浸没至浆液液面以下,浸泡处理10min后,取出并置于130℃下马弗炉中,预热30min后,再按15℃/min升温至700℃,保温烧结3h后,静置冷却至室温,用去离子水冲洗5次后,在90℃下干燥8h,制备得多孔基体,按质量比1:10:50,将八水合氧氯化锆、六水合硝酸钇和萤石混合,在室温下置于400r/min下球磨5h,过200目筛得混合粉末,按质量比1:10,将混合粉末与乙酰丙酮混合并置于300W下超声分散15min,得混合分散液,将混合分散液置于反应釜中,在220℃下保温加热反应12h,静置冷却至室温得混合反应液,过滤得滤饼,用无水乙醇洗涤5次后真空干燥并碾磨,得改性粉末;按重量份数计分别称量15份石英、8份钠长石、5份石灰石、7份高岭土和8份改性粉末混合,球磨过250目筛,得球磨釉料粉末,按重量份数计,分别称量70份去离子水、20份质量分数10%聚乙烯醇溶液和10份球磨釉料粉末搅拌混合,超声分散处理得釉料分散液,按质量比1:10,将多孔基体浸泡至釉料分散液中,浸泡处理12h后,取出基体并置于150℃马弗炉中,预热15min后,再按8℃/min升温至900℃,保温烧结2h后,静置冷却至室温,即可制备得一种抗渣钢包浇注料。
对比例:洛阳市某耐火材料有限公司生产的钢包浇注料。
对实例1~3制得的抗渣钢包浇注料与对比例的钢包浇注料进行性能检测,其检测结果如表1所示:
表1
综上所述,本发明制得的抗渣钢包浇注料抗渣侵蚀性能较好,使钢水不易受炉渣污染,有效延长了钢包使用寿命。
Claims (4)
1.一种抗渣钢包浇注料的制备方法,其特征在于所述的制备步骤为:
(1)按重量份数计,分别称量45~50份铝矾土、15~20份白刚玉、5~10份铝酸钙水泥、3~5份氧化铝和1~2份硅微粉混合并球磨过200目筛得混合粉末,按质量比1:15,将混合粉末与去离子水混合,得混合稀浆液,取聚氨酯海绵,将其浸泡至混合稀浆液中,随后取出并保温烧结,静置冷却至室温,得多孔基体;
(2)按质量比1:10:50,将八水合氧氯化锆、六水合硝酸钇和萤石混合,球磨过200目筛得混合粉末,按质量比1:10,将混合粉末与乙酰丙酮混合,超声分散得混合分散液,将混合分散液置于反应釜中,保温加热反应后静置冷却至室温,得混合反应液;
(3)对混合反应液过滤,得滤饼,洗涤干燥并碾磨,得改性粉末,按重量份数计分别称量10~15份石英、6~8份钠长石、3~5份石灰石、5~7份高岭土和5~8份改性粉末混合,球磨过250目筛,得球磨釉料粉末;
(4)按重量份数计,分别称量65~70份去离子水、15~20份质量分数10%聚乙烯醇溶液和8~10份球磨釉料粉末搅拌混合,超声分散得釉料分散液,按质量比1:10,将多孔基体浸泡至釉料分散液中,浸泡处理后取出基体,预热后程序升温,保温烧结后静置冷却至室温,即可制备得一种抗渣钢包浇注料。
2.根据权利要求1所述的一种抗渣钢包浇注料的制备方法,其特征在于:步骤(1)所述的保温烧结温度为650~700℃。
3.根据权利要求1所述的一种抗渣钢包浇注料的制备方法,其特征在于:步骤(3)所述的洗涤是采用无水乙醇洗涤3~5次。
4.根据权利要求1所述的一种抗渣钢包浇注料的制备方法,其特征在于:步骤(4)所述的程序升温为按8℃/min升温至850~900℃。
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