环保型中间包干式振动料的研究
摘要
干式振动料作为中间包工作衬具有施工方便、烘包时间短、保温性能好、易于翻包等优点,已被迅速推广使用。与普通MgO质材料相比,MgO-CaO质材料具有明显的脱S和脱P作用,对于洁净钢生产具有重要意义。
目前中间包干式振动料主要以酚醛树脂为结合剂,以镁砂和镁钙砂为主要原料。然而酚醛树脂不但价格昂贵,而且对环境和工人健康有很大危害;镁钙砂中的游离CaO极易水化产生膨胀,导致镁钙砂粉化,引起材料出现裂纹或开裂,使这类材料在实际应用中受到一定限制。
本文通过对无机和有机结合剂进行选择,确定了无毒、无害,无污染的环保型结合剂。研究发现多羟基糖-含水硅酸钠复合结合剂是一种较为理想的中间包干式振动料结合剂;结合剂加入量,热处理升温速度以及材料基质种类等对试样低温烘烤强度有明显影响。
以烧结镁砂为主要原料,采用多羟基糖-含水硅酸钠复合结合剂制备了镁质中间包干式振动料。研究了多羟基糖和含水硅酸钠对干式振动料物理性能和抗渣性能的影响,以及高铝矾土粉,α-Al2O3粉,石墨碳和金属铝粉对干式振动料抗渣渗透性能的影响。结果表明:镁质干式振动料中多羟基糖和含水硅酸钠加入量对镁质干式振动料性能影响显著;引入高铝矾土粉,α-Al2O3粉,石墨碳和金属铝粉能有效提高镁质干式振动料抗渣性能。
以烧结镁砂和无水化钙质材料(石灰石、白云石、消石灰等)为主要原料,采用多羟基糖-含水硅酸钠复合结合剂制备了镁钙质中间包干式振动料。研究了钙质原料的种类、粒度和数量以及环保结合剂对镁钙质干式振动料性能的影响。结果表明:镁钙质干式振动料中多羟基糖和五水硅酸钠加入量分别为4%和2～4%为宜;石灰石是一种较理想的干式振动料CaO源材料,调整石灰石的颗粒级配,镁钙质干式振动料试样可以获得了较好的综合性能。
Dry vibratable materials has unique merits. Because of its easy installation, fast speed of temperature rise, long life and easy separation from tundish etc. So dry vibratable materials has been developed and applied quickly in China. Compared with MgO material, MgO-CaO material have clear desulfurization and dephosphorization effect to the molten steel, and that has important significance for clean steel production.
Nowadays,phenolic resin is used as the most popular binder and sintered magnesia and limestone as main starting materials. Simultaneously there is also fatal disadvantages. For instance, phenolic resin is hign in price ,moreover it can pollute environment and harm to works’health. The free CaO in magnesia-calcia is hydrated easily, which will lead to cracks or pulverization of material structure. So the dry vibratable materials be limited in practical application.
The paper has do some choice experiments on inorganic binders and organic binders and has discovered some no-contamination binders which don’t product the poisonus and harmful gas in the course of toasting and using. The research shows that ediblee sugar-sodium metasilicate pentahydrate as composite binder is a comparatively ideal for dry vibratable materials. The CCS of dry vibration refractory were influenced by the addition amount of binders, heating rate and category of material.
Using sintered magnesia as main starting materials, edible sugare-sodium metasilicate pentahydrate as composite binder, the basic dry vibration refractory was prepared. Effect to physical properties and penetration resistance of dry vibration refractory by adding edible sugare-sodium metasilicate pentahydrate、high alumina bauxite,α-Al2O3,metal aluminum and graphite carbon have been investigated systematically. The result shows that effect of edible sugare-sodium metasilicate pentahydrate binder on MgO based dry vibration mix refractory is remarkable.; Adding high alumina bauxite,α-Al2O3, metal aluminum or graphite carbon in the materials can promote its penetration resistanc.
By using sintered magnisia and calcareous materials (natural limestone, dolomite and hydrated lime) as the starting materials and the pollution-free composite binding agent as binder, the environmental friendly MgO-CaO based dry vibratable refractory was studied. The properties of dry vibration refractory were influenced by the variety, gain size and addition content of calcareous raw material were systematically investigated. The experimental results show that the MgO-CaO based dry vibratable refractory with 4%edible sugare and 2～4% sodium metasilicate pentahydrate as binder has better propeties. Natural limestone as sources of CaO, the MgO-CaO based dry vibration refractory has good comprehensive properties, while the dry vibration mix with reasonable limestone grain composition can be best.
目前中间包干式振动料主要以酚醛树脂为结合剂,以镁砂和镁钙砂为主要原料。然而酚醛树脂不但价格昂贵,而且对环境和工人健康有很大危害;镁钙砂中的游离CaO极易水化产生膨胀,导致镁钙砂粉化,引起材料出现裂纹或开裂,使这类材料在实际应用中受到一定限制。
本文通过对无机和有机结合剂进行选择,确定了无毒、无害,无污染的环保型结合剂。研究发现多羟基糖-含水硅酸钠复合结合剂是一种较为理想的中间包干式振动料结合剂;结合剂加入量,热处理升温速度以及材料基质种类等对试样低温烘烤强度有明显影响。
以烧结镁砂为主要原料,采用多羟基糖-含水硅酸钠复合结合剂制备了镁质中间包干式振动料。研究了多羟基糖和含水硅酸钠对干式振动料物理性能和抗渣性能的影响,以及高铝矾土粉,α-Al2O3粉,石墨碳和金属铝粉对干式振动料抗渣渗透性能的影响。结果表明:镁质干式振动料中多羟基糖和含水硅酸钠加入量对镁质干式振动料性能影响显著;引入高铝矾土粉,α-Al2O3粉,石墨碳和金属铝粉能有效提高镁质干式振动料抗渣性能。
以烧结镁砂和无水化钙质材料(石灰石、白云石、消石灰等)为主要原料,采用多羟基糖-含水硅酸钠复合结合剂制备了镁钙质中间包干式振动料。研究了钙质原料的种类、粒度和数量以及环保结合剂对镁钙质干式振动料性能的影响。结果表明:镁钙质干式振动料中多羟基糖和五水硅酸钠加入量分别为4%和2～4%为宜;石灰石是一种较理想的干式振动料CaO源材料,调整石灰石的颗粒级配,镁钙质干式振动料试样可以获得了较好的综合性能。
Dry vibratable materials has unique merits. Because of its easy installation, fast speed of temperature rise, long life and easy separation from tundish etc. So dry vibratable materials has been developed and applied quickly in China. Compared with MgO material, MgO-CaO material have clear desulfurization and dephosphorization effect to the molten steel, and that has important significance for clean steel production.
Nowadays,phenolic resin is used as the most popular binder and sintered magnesia and limestone as main starting materials. Simultaneously there is also fatal disadvantages. For instance, phenolic resin is hign in price ,moreover it can pollute environment and harm to works’health. The free CaO in magnesia-calcia is hydrated easily, which will lead to cracks or pulverization of material structure. So the dry vibratable materials be limited in practical application.
The paper has do some choice experiments on inorganic binders and organic binders and has discovered some no-contamination binders which don’t product the poisonus and harmful gas in the course of toasting and using. The research shows that ediblee sugar-sodium metasilicate pentahydrate as composite binder is a comparatively ideal for dry vibratable materials. The CCS of dry vibration refractory were influenced by the addition amount of binders, heating rate and category of material.
Using sintered magnesia as main starting materials, edible sugare-sodium metasilicate pentahydrate as composite binder, the basic dry vibration refractory was prepared. Effect to physical properties and penetration resistance of dry vibration refractory by adding edible sugare-sodium metasilicate pentahydrate、high alumina bauxite,α-Al2O3,metal aluminum and graphite carbon have been investigated systematically. The result shows that effect of edible sugare-sodium metasilicate pentahydrate binder on MgO based dry vibration mix refractory is remarkable.; Adding high alumina bauxite,α-Al2O3, metal aluminum or graphite carbon in the materials can promote its penetration resistanc.
By using sintered magnisia and calcareous materials (natural limestone, dolomite and hydrated lime) as the starting materials and the pollution-free composite binding agent as binder, the environmental friendly MgO-CaO based dry vibratable refractory was studied. The properties of dry vibration refractory were influenced by the variety, gain size and addition content of calcareous raw material were systematically investigated. The experimental results show that the MgO-CaO based dry vibratable refractory with 4%edible sugare and 2～4% sodium metasilicate pentahydrate as binder has better propeties. Natural limestone as sources of CaO, the MgO-CaO based dry vibration refractory has good comprehensive properties, while the dry vibration mix with reasonable limestone grain composition can be best.
引文
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