CN114874003A - 一种含六铝酸钙的低导热钢包永久层浇注料 - Google Patents
一种含六铝酸钙的低导热钢包永久层浇注料 Download PDFInfo
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 76
- 239000011575 calcium Substances 0.000 title claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 70
- 239000000843 powder Substances 0.000 claims abstract description 70
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002994 raw material Substances 0.000 claims abstract description 29
- 239000004568 cement Substances 0.000 claims abstract description 21
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 12
- 238000010304 firing Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 20
- 229920002472 Starch Polymers 0.000 claims description 8
- 235000019698 starch Nutrition 0.000 claims description 8
- 239000008107 starch Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 abstract description 18
- 239000011148 porous material Substances 0.000 abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 25
- 238000005245 sintering Methods 0.000 description 17
- 229910052593 corundum Inorganic materials 0.000 description 16
- 239000010431 corundum Substances 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000009413 insulation Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- -1 alkylbenzene sulfonate Chemical class 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 8
- 238000005266 casting Methods 0.000 description 8
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000001737 promoting effect Effects 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 229910052596 spinel Inorganic materials 0.000 description 5
- 239000011029 spinel Substances 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 239000002984 plastic foam Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 229910052609 olivine Inorganic materials 0.000 description 3
- 239000010450 olivine Substances 0.000 description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 150000004996 alkyl benzenes Chemical class 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052849 andalusite Inorganic materials 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000007580 dry-mixing Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 235000019832 sodium triphosphate Nutrition 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 229940077388 benzenesulfonate Drugs 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000013332 literature search Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- VXYADVIJALMOEQ-UHFFFAOYSA-K tris(lactato)aluminium Chemical compound CC(O)C(=O)O[Al](OC(=O)C(C)O)OC(=O)C(C)O VXYADVIJALMOEQ-UHFFFAOYSA-K 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Abstract
一种含六铝酸钙的低导热钢包永久层浇注料,其原料组成及wt%为:粒度≥5mm至<20mm微孔莫来石骨料:25~30%、粒度≥1mm至<5mm六铝酸钙骨料:15~35%、粒度<1mm的六铝酸钙细骨料:5~15%、粒度≤0.074mm的莫来石细粉:20~35%、粒度≤20μm的α‑Al2O3微粉:3~7%、粒度≤50μm的SiO2微粉:1~4%、粒度≤0.074mm的铝酸钙水泥:2~5%、有机纤维:0.1~0.5%、聚合羧酸盐减水剂:0.05~0.3%。本发明使钢包永久层浇注料的导热系数从0.9~1.2w/(m·k)降低到0.75w/(m·k)以下,且1500℃×3h高温烧后耐压强度不低于60MPa,开口气孔及闭气孔较少,保温性能大幅度提高,可降低钢包外表面温度不低于50℃。
Description
技术领域
本发明涉及一种炼钢用耐火浇注材料,具体属于一种含六铝酸钙的低导热钢包永久层浇注料。
背景技术
近年来,随着低碳冶炼技术的发展,废钢用量大幅度增加,在不增加设备投资的情况下,钢厂多采用转炉、钢包扩容来达到增产的目的,钢包扩容,多以减薄工作衬或永久衬的厚度为主要措施。如一些厂家将工作层由200mm降低到170mm,渣线层由220mm降低到190mm;将永久层由120mm降低到90mm。但是随着减薄后的砖衬,必然会导致钢包传热加快,使钢壳外表温度增加,钢包内钢水温降加大。为解决此种情况下所带来的问题,必然对钢包永久层的质量及保温性能提出新的要求。
在本发明之前,本技术领域认为永久层就是起保温隔热的,在特殊状况下充当暂时的工作层使用。然而在钢包减薄的情况下,必然要求永久层在短暂作为工作衬使用的性能前提下,更好的满足其保温隔热的要求。因此如何调整永久层的组成,适度降低导热率,且提高材料的抗侵蚀性能,是值得探索的工作。经检索:
公开号为CN103449821A的中国专利,其所公开的钢包永久层浇注料的原料组分的重量百分比为:烧结莫来石40~50%、电熔莫来石10~15%、刚玉15~20%、氧化铝超细粉5~10%,氧化硅超细粉5~10%,纯铝酸钙水泥6~8%,漂珠2.2~4.0%。其主要用于钢包永久层的浇注。该专利由于使用原料以烧结莫来石、电熔莫来石、刚玉为主,其成本高,导热系数较高,导致其隔热性能不佳,其使用漂珠最高使用温度1300-1400℃左右,而钢水温度可以达到1530-1620℃,加上纯铝酸钙水泥含量高,低熔物多,过高就会收缩爆裂,对于钢包永久层而言,后期的保温性能会受影响。
申请号为CN202011300993.6的中国专利,所述钢包永久层浇注料的原料组成及重量份组成(%)为:刚玉35-45;氧化铝空心球20-35;红柱石5-10;铝酸钙水泥4-6;氧化铝微粉5-10;减水剂0.1-1。其所述刚玉为板状刚玉或电熔刚玉中的一种或多种;所述刚玉中Al2O3含量≥98wt%;刚玉的粒度级配为:8-5mm 23-27%;5-3mm 8-12%;0.088-0mm 11-15%。所述氧化铝空心球中Al2O3含量≥98wt%,其氧化铝空心球的粒度级配为:3-1mm 9-15%;1-0.2mm 15-22%;所述红柱石中Al2O3含量≥54wt%,粒度为1-3mm;所述铝酸钙水泥中Al2O3含量≥73%;所述氧化铝微粉的粒度D50为1.5μm、4μm、10μm的一种或多种;所述减水剂为三聚磷酸钠、六偏磷酸钠、聚羧酸盐中的一种或多种。该专利使用氧化铝空心球量大的20-35%,虽然隔热性能好,氧化铝空心球闭气孔量大,氧化铝空心球成本高,作为极限条件下的工作层使用存在安全风险。
公开号为CN104119093A的中国专利,其原料组成及重量百分比含量为:1~25mm刚玉5~50%,1~15mm矾土10~50%,0.001~0.074mm刚玉1~15%,0.001~0.074mm矾土1~15%,0.01~0.5mm塑料泡沫粒子0.5~2%,纯铝酸钙水泥1~5%,有机添加剂1~5%,减水剂1~5%。由于轻质钢包永久层浇注料中加入有塑料泡沫粒子,利用塑料泡沫粒子在高温下受热熔解后,在浇注料中形成分布均匀的0.5mm以下的空洞,降低了钢包永久层浇注料的体积密度,从而达到降低导热系数的作用。但该专利使用刚玉量大,成本高,作为永久层材料使用不合适,且且塑料泡沫粒子搅拌混合过程容易上浮,浇注料中难以分散均匀,局部富集在使用中存在大的孔洞有安全隐患。
公开号为CN102887715A的中国专利,其浇注料组成主要包括:高铝矾土45~75份;高铝空心球10~20份;蓝晶石粉3~5份;氧化铝微粉3~5份;二氧化硅微粉5~7份;纯铝酸钙水泥3~5份;碱式乳酸铝粉0.5~1.5份;金属铝粉0.02~0.06份;有机纤维0.1~0.3份;减水剂0.1~0.3份。该发明所述的用于快速烘烤钢包永久层的浇注料具有较高的强度和耐火度、好的热震稳定性、较低的体积密度和导热率,而且寿命相当长的特点。但该专利含高铝空心球量大,矾土抗热震性不好;空心球成本高,闭气孔量大,作为极限条件下的工作层使用存在安全风险。
公开号为CN108610063A的中国专利,其浇注料按照质量百分比计包括65~72%的微孔莫来石颗粒、9~16%的刚玉粉、7~14%的莫来石微粉、1~3%的硅微粉、3~6%的氧化铝微粉和1~3%的铝酸钙水泥,并外加以上重量0.2~0.5%的减水剂和0.1~0.4%的烷基苯磺酸盐。该专利高性能莫来石保温耐火浇注料采用微孔莫来石为浇注料主材,配合细粉及微粉组成的粉体,与烷基苯磺酸盐为成孔剂浇注成型,作为高温炉窑如钢包永久层内衬材料在抗热震性能、抗侵蚀性能、保温性能、经济性方面都具有显著的优点,可以减少内装的钢水温降,降低包壳温度,有利于连铸钢水温度的稳定性和铸坯质量,进而可有效地降低转炉出钢温度,为节省能源创造可观的经济效益。该专利的微孔莫来石与烷基苯磺酸盐为成孔剂浇注成型,发泡法气孔较大,虽然有低导热性能,但烷基苯磺酸钠发泡,用水量大,容易产生大的气孔。
公开号为CN105645936A的中国专利,其所述的高铝空心球轻质浇注料以28-48wt%的高铝空心球、14-30wt%的焦宝石、6-30wt%的矾土细粉、6-10wt%的氧化铝微粉、1-5wt%的二氧化硅微粉、2-10wt%的铝酸钙水泥和1-5wt%的广西黏土为原料,外加所述原料0.04-0.2wt%的三聚磷酸钠和0.1-0.5wt%的六偏磷酸钠,干混1-3min,再外加所述原料的7-15wt%的水,混合2-5min,即得高铝空心球轻质浇注料。本发明具有工艺简单、生产成本低和对设备无特殊要求的特点;所制备的高铝空心球轻质浇注料体积密度低、热导率低、耐压强度高、重烧线变化率低、体积稳定性好和隔热保温效果好,适用于钢包永久层。该专利同中国专利CN102887715A含高铝空心球量大,矾土抗热震性不好;加粘土用水量大;空心球成本高,闭气孔量大,作为极限条件下的工作层使用存在安全风险。
公开号为CN108395262A的中国专利,其所述的橄榄石结合镁铝尖晶石空心球浇注料以40-50vol%体积含量的镁铝尖晶石空心球骨料和50-60vol%体积含量的粉料为原料,其中所用粉料的种类及含量为:天然橄榄石细粉10-40wt%,氧化镁细粉50-70wt%、氧化硅细粉10-35wt%,氧化硅微粉5-15wt%,外加0.15-0.35wt%的六偏磷酸钠。将上述原料干混1-2分钟,再加入占原料总量8~15wt%的水,湿混2-4分钟,即得到橄榄石结合镁铝尖晶石空心球浇注料。该文献虽具有制备工艺简单、生产成本低、生产效率高、对设备无特殊要求等特点,但所制备的橄榄石结合镁铝尖晶石空心球浇注料,耐高温性好,能抗碱性气氛侵蚀,而且隔热保温性能优异,适用于钢包永久层。该专利含空心球量太多,成本高,有一定的安全隐患,作为极限条件下的工作层使用存在安全风险。
公开号为CN112500175A的中国专利,其所述的轻质高强钢包永久层浇注料及其制备方法,轻质高强钢包永久层浇注料按照质量份数计算,其制备原料包括以下组分:废中包盖回收骨料20-100份、轻质莫来石骨料5-50份、废刚玉砖回收细粉1-30份、纯铝酸钙水泥1-30份、硅微粉1-15份、白刚玉除尘粉0.5-10份、α氧化铝微粉0.5-10份、钢纤维0.5-10份、有机纤维0.05-2份、减水剂0.05-2份、防爆剂0.001-0.2份.该轻质高强钢包永久层浇注料及其制备方法,该钢包永久层浇注料强度高、体积密度和导热系数小,大大提高了钢包的保温性能,且使用多种废弃料作为骨料,实现了回收原料的重复利用,节约了资源和成本。该专利含大量回收料,成分无法稳定控制,且使用轻骨料,作为钢包永久层,风险极大,一旦钢水渗透穿漏,存在特大事故风险。
从文献检索看:钢包永久层浇注料的专利有的以烧结或电熔刚玉、莫来石、矾土做骨料,较少考虑低导热保温隔热问题;有的以微孔莫来石、空心球、漂珠、塑料空心球为主,适度考虑了低热导率,但是在薄工作衬的情况下,安全性与耐用性有欠缺;有的以高铝空心球、镁铝尖晶石空心球为主的轻质浇注料,过度考虑了低热导率,忽视了安全使用极限,不适宜在薄工作衬钢包永久层使用。
发明内容
本发明针对现有钢包永久层浇注料热导率高、抗侵蚀性能差,钢包扩容后炉衬减薄容易带来安全隐患的不足,提供一种增加微孔莫来石、六铝酸钙用量、强化基质方法,使得钢包永久层浇注料具有低导热、抗侵蚀的特点,以提高钢包永久层的使用寿命,减少生产过程中钢水的温降的含六铝酸钙的低导热钢包永久层浇注料。
实现上述目的的措施:
一种含六铝酸钙的低导热钢包永久层浇注料,其原料组成及重量百分比含量为:粒度≥5mm至<20mm微孔莫来石骨料:25~30%、粒度≥1mm至<5mm六铝酸钙骨料:15~35%、粒度<1mm的六铝酸钙细骨料:5~15%、粒度≤0.074mm的莫来石细粉:20~35%、粒度≤20μm的α-Al2O3微粉:3~7%、粒度≤50μm的SiO2微粉:1~4%、粒度≤0.074mm的铝酸钙水泥:2~5%、有机纤维:0.1~0.5%、聚合羧酸盐减水剂:0.05~0.3%;在使用时加入占上述原料总重量百分比4~7%的水搅拌均匀。
优选地:粒度≥5mm至<20mm微孔莫来石骨料在25~28.5%。
优选地:粒度≥1mm至<5mm六铝酸钙骨料:17~31%。
优选地:粒度<1mm的六铝酸钙细骨料:7~12%。
优选地:粒度≤0.074mm的莫来石细粉:23~32%。
进一步地:粒度≥1mm至<5mm六铝酸钙骨料及粒度<1mm的六铝酸钙细骨料的粒度<1mm的体积密度均在2.55~3.40g/cm3。
进一步地:粒度≤0.074mm的莫来石细粉中粒度≤0.045mm占比不低于30%。
其在于:所述六铝酸钙细骨料的组分及质量百分比含量为:Al2O3:85~95%,CaO:5~15%。
其在于:粒度≥5mm至<20mm微孔莫来石骨料,其添加有粒度≤45μm的淀粉:0.1~1.0wt%,其余为莫来石,混合后并经过不低于1500℃烧制后破碎而得。
本发明中各原料的作用及机理
粒度≥5mm至<20mm微孔莫来石骨料,并控制加入量在25~30%,优选地用量在25~28.5%,是由于如此尺寸的微孔莫来石骨料强度比较大,且有一定的硬度,含一定量的闭气孔,保温性能好,可以作为浇注料的骨料使用,起到骨架支撑作用;量少于25%,骨料太少,大于30%,骨料过多,不利于整体的强度提高。
粒度≥1mm至<5mm六铝酸钙骨料,并控制加入量在15~35%,优选地用量在17~31%;粒度<1mm的六铝酸钙细骨料,并控制加入量在5~15%,优选的用量在7~12%,是由于如此尺寸的六铝酸钙骨料骨料有一定的强度、抗侵蚀性能,且其导热系数比较低,隔热保温性能好,粗骨料可以作为浇注料的骨料起到骨架支撑作用;细骨料起到填充作用。粒度≥1mm至<5mm六铝酸钙骨料量少于15%,骨料太少,大于35%,骨料过多,不利于整体的强度。粒度<1mm的六铝酸钙细骨料少于5%,不利于紧密堆积,大于15%,细骨料过多,填充效果不佳,不利于紧密堆积。
粒度≤0.074mm的莫来石细粉,并控制加入量在20~35%,优选地用量在23~32%;是由于粒度≤0.074mm的莫来石粉耐火度高,抗热破坏性能好,可以起到基质的致密烧结作用。量少于20%,对骨料包裹不够,大于35%,细粉过多,可能产生烧结的收缩裂纹。
粒度≤20μm的α-Al2O3微粉,并控制加入量在3~7%,是由于α-Al2O3微粉耐火度高,分散效果好,利于烧结,可以起到促进基质致密烧结的作用;量少于3%,促进烧结的效果差,大于7%,超细粉过多,会产生烧结的收缩裂纹。
粒度≤50μm的SiO2微粉,并控制加入量在1~4%,是由于SiO2微粉分散效果好,利于烧结,可以起到促进基质致密烧结的作用。量少于1%,促进烧结的效果差,大于4%,容易带入低熔点物质,烧结也容易产生收缩裂纹。
粒度≤0.074mm的铝酸钙水泥,并控制加入量在1~5%,是由于铝酸钙水泥结合强度比较高,利于骨料与细粉的结合,同时可以起到促进基质烧结的作用。量少于1%,强度低,大于5%,容易带入杂质影响高温性能。
有机纤维:并控制加入量在0.1~0.5%,是由于有机纤维在烘烤过程中烧蚀熔化形成排气孔,利于排除永久层的水分;量少于0.1%,排气孔不够,容易剥落;大于0.5%,孔太多,传热快影响保温效果。
聚合羧酸盐减水剂,并控制加入量在0.05~0.3%,是由于聚合羧酸盐减水剂对水泥的分散效果好,利于水泥结合用水量的减少。量少于0.05%,分散减水效果差,大于0.3%,成本高,分散效果变化不大。
本发明与现有技术相比,本发明通过添加微孔莫来石及六铝酸钙,尤其是六铝酸钙,使得钢包永久层浇注料的导热系数从0.9~1.2w/(m·k)降低到0.75w/(m·k)以下,且1500℃×3h高温烧后耐压强度不低于60MPa,开口气孔及闭气孔较少,保温性能大幅度提高,减少生产过程中钢水的温降,可降低钢包外表面温度不低于50℃。
具体实施方式
下面对本发明予以详细描述:
实施例1
一种含六铝酸钙的低导热钢包永久层浇注料,其原料组成及重量百分比含量为:粒度≥5mm至<20mm微孔莫来石骨料:25%、粒度≥1mm至<5mm六铝酸钙骨料:29%、粒度<1mm的六铝酸钙细骨料:10%、粒度≤0.074mm的莫来石细粉:28%、粒度≤20μm的α-Al2O3微粉:3%、粒度≤50μm的SiO2微粉:2%、粒度≤0.074mm的铝酸钙水泥:2.8%、有机纤维:0.15%、聚合羧酸盐减水剂:0.05%;在使用时加入了占上述原料总重量百分比4.7%的水搅拌均匀。
粒度≥1mm至<5mm六铝酸钙骨料及粒度<1mm的六铝酸钙细骨料的粒度<1mm的体积密度均在3.35g/cm3。
粒度≤0.074mm的莫来石细粉中粒度≤0.045mm占比为70%。
所述六铝酸钙细骨料的组分及质量百分比含量为:Al2O3:92.5%,CaO:7.5%。
粒度≥5mm至<20mm微孔莫来石骨料,其添加有粒度≤45μm的淀粉:0.12wt%,其余为莫来石,混合后并经过1506℃烧制后破碎而得。
经检测,本实施例的永久层浇注料800℃的导热系数为0.52w/(m·k),而常规使用的高铝质永久层浇注料800℃的导热系数为0.9w/(m·k);降低了约0.38w/(m·k);1500℃×3h高温烧后耐压强度75.5MPa,保温性能提高,可降低钢包外表面温度65℃,通过提高钢包的保温可以减少生产过程中钢水的温降。
实施例2
一种含六铝酸钙的低导热钢包永久层浇注料,其原料组成及重量百分比含量为:粒度≥5mm至<20mm微孔莫来石骨料:30%、粒度≥1mm至<5mm六铝酸钙骨料:15%、粒度<1mm的六铝酸钙细骨料:11.2%、粒度≤0.074mm的莫来石细粉:34%、粒度≤20μm的α-Al2O3微粉:5%、粒度≤50μm的SiO2微粉:1%、粒度≤0.074mm的铝酸钙水泥:3.5%、有机纤维:0.2%、聚合羧酸盐减水剂:0.1%;在使用时加入了占上述原料总重量百分比5.2%的水搅拌均匀。
粒度≥1mm至<5mm六铝酸钙骨料及粒度<1mm的六铝酸钙细骨料的粒度<1mm的体积密度均在3.20g/cm3
粒度≤0.074mm的莫来石细粉中粒度≤0.045mm占比为55%。
所述六铝酸钙细骨料的组分及质量百分比含量为:Al2O3:94.8%,CaO:5.2%。
粒度≥5mm至<20mm微孔莫来石骨料,其添加有粒度≤45μm的淀粉:0.22wt%,其余为莫来石,混合后并经过1519℃烧制后破碎而得。
经检测,本实施例的永久层浇注料800℃的导热系数为0.65w/(m·k),而常规使用的高铝质永久层浇注料800℃的导热系数为0.9w/(m·k);降低了约0.25w/(m·k);1500℃×3h高温烧后耐压强度68.2MPa,保温性能提高,可降低钢包外表面温度65℃,通过提高钢包的保温可以减少生产过程中钢水的温降。
实施例3
一种含六铝酸钙的低导热钢包永久层浇注料,其原料组成及重量百分比含量为:粒度≥5mm至<20mm微孔莫来石骨料:26.5%、粒度≥1mm至<5mm六铝酸钙骨料:35%、粒度<1mm的六铝酸钙细骨料:5%、粒度≤0.074mm的莫来石细粉:20%、粒度≤20μm的α-Al2O3微粉:7%、粒度≤50μm的SiO2微粉:4%、粒度≤0.074mm的铝酸钙水泥:2%、有机纤维:0.3%、聚合羧酸盐减水剂:0.2%;在使用时加入了占上述原料总重量百分比4.5%的水搅拌均匀。
粒度≥1mm至<5mm六铝酸钙骨料及粒度<1mm的六铝酸钙细骨料的粒度<1mm的体积密度均在2.98g/cm3
粒度≤0.074mm的莫来石细粉中粒度≤0.045mm占比为85%。
所述六铝酸钙细骨料的组分及质量百分比含量为:Al2O3:90.2%,CaO:9.8%。
粒度≥5mm至<20mm微孔莫来石骨料,其添加有粒度≤45μm的淀粉:0.51wt%,其余为莫来石,混合后并经过1535℃烧制后破碎而得。
经检测,本实施例的永久层浇注料800℃的导热系数为0.55w/(m·k),而常规使用的高铝质永久层浇注料800℃的导热系数为0.9w/(m·k);降低了约0.35w/(m·k);1500℃×3h高温烧后耐压强度78.2MPa,保温性能提高,可降低钢包外表面温度58℃,通过提高钢包的保温可以减少生产过程中钢水的温降。
实施例4
一种含六铝酸钙的低导热钢包永久层浇注料,其原料组成及重量百分比含量为:粒度≥5mm至<20mm微孔莫来石骨料:28%、粒度≥1mm至<5mm六铝酸钙骨料:29.2%、粒度<1mm的六铝酸钙细骨料:7%、粒度≤0.074mm的莫来石细粉:25%、粒度≤20μm的α-Al2O3微粉:4%、粒度≤50μm的SiO2微粉:1.5%、粒度≤0.074mm的铝酸钙水泥:5%、有机纤维:0.13%、聚合羧酸盐减水剂:0.17%;在使用时加入了占上述原料总重量百分比6.2%的水搅拌均匀。
粒度≥1mm至<5mm六铝酸钙骨料及粒度<1mm的六铝酸钙细骨料的粒度<1mm的体积密度均在2.56g/cm3
粒度≤0.074mm的莫来石细粉中粒度≤0.045mm占比为40%。
所述六铝酸钙细骨料的组分及质量百分比含量为:Al2O3:85.5%,CaO:14.5%。
粒度≥5mm至<20mm微孔莫来石骨料,其添加有粒度≤45μm的淀粉:0.34wt%,其余为莫来石,混合后并经过1530℃烧制后破碎而得。
经检测,本实施例的永久层浇注料800℃的导热系数为0.48w/(m·k),而常规使用的高铝质永久层浇注料800℃的导热系数为0.9w/(m·k);降低了约0.42w/(m·k);1500℃×3h高温烧后耐压强度81.5MPa,保温性能提高,可降低钢包外表面温度70℃,通过提高钢包的保温可以减少生产过程中钢水的温降。
实施例5
一种含六铝酸钙的低导热钢包永久层浇注料,其原料组成及重量百分比含量为:粒度≥5mm至<20mm微孔莫来石骨料:25.5%、粒度≥1mm至<5mm六铝酸钙骨料:20.6%、粒度<1mm的六铝酸钙细骨料:9%、粒度≤0.074mm的莫来石细粉:32%、粒度≤20μm的α-Al2O3微粉:6%、粒度≤50μm的SiO2微粉:2.5%、粒度≤0.074mm的铝酸钙水泥:4%、有机纤维:0.16%、聚合羧酸盐减水剂:0.24%;在使用时加入了占上述原料总重量百分比5.5%的水搅拌均匀。
粒度≥1mm至<5mm六铝酸钙骨料及粒度<1mm的六铝酸钙细骨料的粒度<1mm的体积密度均在2.65g/cm3
粒度≤0.074mm的莫来石细粉中粒度≤0.045mm占比为50%。
所述六铝酸钙细骨料的组分及质量百分比含量为:Al2O3:87.2%,CaO:12.8%。
粒度≥5mm至<20mm微孔莫来石骨料,其添加有粒度≤45μm的淀粉:0.95wt%,其余为莫来石,混合后并经过1546℃烧制后破碎而得。
经检测,本实施例的永久层浇注料800℃的导热系数为0.56w/(m·k),而常规使用的高铝质永久层浇注料800℃的导热系数为0.9w/(m·k);降低了约0.34w/(m·k);1500℃×3h高温烧后耐压强度71.3MPa,保温性能提高,可降低钢包外表面温度62℃,通过提高钢包的保温可以减少生产过程中钢水的温降。
实施例6
一种含六铝酸钙的低导热钢包永久层浇注料,其原料组成及重量百分比含量为:粒度≥5mm至<20mm微孔莫来石骨料:27%、粒度≥1mm至<5mm六铝酸钙骨料:25.15%、粒度<1mm的六铝酸钙细骨料:8.5%、粒度≤0.074mm的莫来石细粉:26%、粒度≤20μm的α-Al2O3微粉:5.5%、粒度≤50μm的SiO2微粉:3.5%、粒度≤0.074mm的铝酸钙水泥:3.8%、有机纤维:0.25%、聚合羧酸盐减水剂:0.3%;在使用时加入了占上述原料总重量百分比5.1%的水搅拌均匀。
粒度≥1mm至<5mm六铝酸钙骨料及粒度<1mm的六铝酸钙细骨料的粒度<1mm的体积密度均在2.85g/cm3
粒度≤0.074mm的莫来石细粉中粒度≤0.045mm占比为33%。
所述六铝酸钙细骨料的组分及质量百分比含量为:Al2O3:91.5%,CaO:8.5%。
粒度≥5mm至<20mm微孔莫来石骨料,其添加有粒度≤45μm的淀粉:0.79wt%,其余为莫来石,混合后并经过1537℃烧制后破碎而得。
经检测,本实施例的永久层浇注料800℃的导热系数为0.60w/(m·k),而常规使用的高铝质永久层浇注料800℃的导热系数为0.9w/(m·k);降低了约0.30w/(m·k);1500℃×3h高温烧后耐压强度73.8MPa,保温性能提高,可降低钢包外表面温度59℃,通过提高钢包的保温可以减少生产过程中钢水的温降。
本具体实施方式仅为最佳例举,并非对本发明技术方案的限制性实施。
Claims (9)
1.一种含六铝酸钙的低导热钢包永久层浇注料,其原料组成及重量百分比含量为:粒度≥5mm至<20mm微孔莫来石骨料:25~30%、粒度≥1mm至<5mm六铝酸钙骨料:15~35%、粒度<1mm的六铝酸钙细骨料:5~15%、粒度≤0.074mm的莫来石细粉:20~35%、粒度≤20μm的α-Al2O3微粉:3~7%、粒度≤50μm的SiO2微粉:1~4%、粒度≤0.074mm的铝酸钙水泥:2~5%、有机纤维:0.1~0.5%、聚合羧酸盐减水剂:0.05~0.3%;在使用时加入占上述原料总重量百分比4~7%的水搅拌均匀。
2.如权利要求1所述的一种含六铝酸钙的低导热钢包永久层浇注料,其特征在于:粒度≥5mm至<20mm微孔莫来石骨料在25~28.5%。
3.如权利要求1所述的一种含六铝酸钙的低导热钢包永久层浇注料,其特征在于:粒度≥1mm至<5mm六铝酸钙骨料:17~31%。
4.如权利要求1所述的一种含六铝酸钙的低导热钢包永久层浇注料,其特征在于:粒度<1mm的六铝酸钙细骨料:7~12%。
5.如权利要求1所述的一种含六铝酸钙的低导热钢包永久层浇注料,其特征在于:粒度≤0.074mm的莫来石细粉:23~32%。
6.如权利要求1或3或4所述的一种含六铝酸钙的低导热钢包永久层浇注料,其特征在于:粒度≥1mm至<5mm六铝酸钙骨料及粒度<1mm的六铝酸钙细骨料的粒度<1mm的体积密度均在2.55~3.40g/cm3。
7.如权利要求1或5所述的一种含六铝酸钙的低导热钢包永久层浇注料,其特征在于:粒度≤0.074mm的莫来石细粉中粒度≤0.045mm占比不低于30%。
8.如权利要求1或3或4或6所述的一种含六铝酸钙的低导热钢包永久层浇注料,其特征在于:所述六铝酸钙细骨料的组分及质量百分比含量为:Al2O3 :85~95%,CaO:5~15%。
9.如权利要求1所述的一种含六铝酸钙的低导热钢包永久层浇注料,其特征在于:粒度≥5mm至<20mm微孔莫来石骨料,其添加有粒度≤45μm的淀粉:0.1~1.0wt%,其余为莫来石,混合后并经过不低于1500℃烧制后破碎而得。
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