CN113860895A - 一种循环经济型挡渣墙及其制备方法 - Google Patents
一种循环经济型挡渣墙及其制备方法 Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000000463 material Substances 0.000 claims abstract description 42
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 34
- 230000000903 blocking effect Effects 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 17
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 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 16
- 239000010935 stainless steel Substances 0.000 claims abstract description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 42
- 239000011449 brick Substances 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 13
- 238000004806 packaging method and process Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 11
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 10
- 229910052681 coesite Inorganic materials 0.000 claims description 10
- 229910052906 cristobalite Inorganic materials 0.000 claims description 10
- 239000011777 magnesium Substances 0.000 claims description 10
- 229910052749 magnesium Inorganic materials 0.000 claims description 10
- 229910052682 stishovite Inorganic materials 0.000 claims description 10
- 229910052905 tridymite Inorganic materials 0.000 claims description 10
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 7
- 239000004327 boric acid Substances 0.000 claims description 6
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 6
- 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 claims description 6
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 6
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 6
- 239000011246 composite particle Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 125000005619 boric acid group Chemical group 0.000 claims description 2
- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000011819 refractory material Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- 238000009628 steelmaking Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 229910052839 forsterite Inorganic materials 0.000 description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 3
- UVGLBOPDEUYYCS-UHFFFAOYSA-N silicon zirconium Chemical compound [Si].[Zr] UVGLBOPDEUYYCS-UHFFFAOYSA-N 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- -1 magnesium aluminum carbon Chemical compound 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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Abstract
本发明公开了一种循环经济型挡渣墙及其制备方法,涉及冶金用耐火材料技术领域,包括如下组分:再生料30%~65%、中档镁砂25%~60%、氧化铝微粉0%~6%、碳化硅细粉2%~4%、硅微粉3%~4.5%、外加剂0.2%~2%、不锈钢纤维0.2%~1.5%。采用回收耐火材料固体废弃资源,达到资源二次利用和获得经济环保效益的目的,生产成本大幅降低,同时生产出来的挡渣墙高温性能好,使用效果良好。
Description
技术领域
本发明涉及冶金用耐火材料技术领域,特别是涉及一种循环经济型挡渣墙及其制备方法。
背景技术
中间包在炼钢环节中位于钢水精炼和连铸结晶器之间环节,主要作为钢包中钢水到结晶器的承接容器,然后把钢水注入到结晶器中。挡渣墙作为连铸中间包的重要组成部分,在中间包中起到隔离大包下渣的作用,同时对中间包流场起到一定的作用,起到均匀中间包内各处钢水温度的作用;另外改变钢水流向,增加钢水在中间包内的停留时间,利于钢水中夹杂物上浮、碰撞、聚集,达到一定的去除夹杂物、净化钢水的作用。因此,中间包对稳定中间包钢水质量、提高产量、优化炼钢品质起着至关重要的作用。而在这一过程中,由于从钢包底部注入到中间包的高速钢水柱流在中间包内停留的第一区域则是由挡渣墙和冲击区工作衬围成的相对封闭区域,唯一的出入口就是挡渣墙上面的过钢孔,另一方面,刚注入中间包内的钢水温度一般都在1480~1550℃之间,因此,挡渣墙直接经受着高温钢液的冲刷及强烈的热应力,可能会导致挡渣墙在作业过程中发生变形、穿孔、开裂或垮塌现象。
炼钢用中间包挡渣墙目前主要通过浇注成型的方式制成,根据不同的炼钢工艺要求及使用环境,主要行业内主流选择的主要有刚玉(尖晶石)质、铝镁质、高铝质、镁橄榄石质和镁(硅)质等。主要的生产工艺为“配料—混炼—(模具准备)浇注成型—养护—脱模—养护、干燥—检查—包装入库”过程,相对工艺繁多,模具又不规则且品种多,故过程中需控制的因素较多。
炼钢用中间包挡渣墙由于浸泡在高温钢水中,必须要有良好的高温强度和抗侵蚀性能。从使用效果看,镁质或镁橄榄石质挡渣墙容易出现开裂、穿孔和垮塌现象,热稳定性较差,镁质由于具有良好的抗侵蚀性能和耐火度高及有效降低带入钢水的氧含量的优点,在优特钢的冶炼中得到了广泛的应用。
然而现在炼钢工艺过程中产生的耐火材料固体废料较多,其废料的消耗使用途径需要不断拓展;同时随着国家对环保要求的高标准化,镁砂原料的生产和质量也受到了较大的影响,镁质挡渣墙的质量稳定性和成本都逐步面临问题。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种循环经济型挡渣墙,包括如下组分:再生料30%~65%、中档镁砂25%~60%、氧化铝微粉0%~6%、碳化硅细粉2%~4%、硅微粉3%~4.5%、外加剂0.2%~2%、不锈钢纤维0.2%~1.5%。
本发明进一步限定的技术方案是:
前所述的一种循环经济型挡渣墙,再生料包括回收的镁铝碳砖颗粒、回收的铝镁碳砖颗粒、报废的镁质挡渣墙颗粒中的一种或多种。
前所述的一种循环经济型挡渣墙,若再生料采用所述镁铝碳砖颗粒或所述铝镁碳砖颗粒,其规格包括1mm≤粒度≤3mm、3mm≤粒度≤5mm、3mm≤粒度≤10mm中的一种或多种。
前所述的一种循环经济型挡渣墙,若再生料采用所述镁质挡渣墙颗粒,其规格包括1mm≤粒度≤3mm、3mm≤粒度≤5mm、5mm≤粒度≤8mm中的多种,或采用3mm≤粒度≤8mm复合粒度模式,或采用1mm≤粒度≤8mm复合粒度模式。
前所述的一种循环经济型挡渣墙,镁铝碳砖主要成分包括:C≥10%,MgO≥52%,Al2O3≤20%,SiO2≤5%,1%≤SiC≤3%。
前所述的一种循环经济型挡渣墙,铝镁碳砖主要成分包括:5%≤C≤10%,10%≤MgO≤25%,Al2O3≥60%,SiO2≤3%,2%≤SiC≤5%。
前所述的一种循环经济型挡渣墙,镁质挡渣墙主要成分包括:MgO≥80%,SiO2≤15%。
前所述的一种循环经济型挡渣墙,中档镁砂中主要成分MgO≥91.5%;
氧化铝微粉中主要成分Al2O3≥99%,中位径D50≤3µm、粒度≤10µm;
碳化硅细粉中主要成分SiC≥95%,粒度≤74µm;
硅微粉中主要成分SiO2≥94%,中位径D50≤3µm、粒度≤35µm;
外加剂包括减水剂0.15%~0.3%、有机防爆纤维0.05%~0.15%和缓凝剂0.01%~0.1%。
前所述的一种循环经济型挡渣墙,减水剂为六偏磷酸钠和改性羧酸中的一种或两种,缓凝剂为硼酸。
本发明的另一目的在于提供一种循环经济型挡渣墙制备方法,包括以下步骤:
S1、按照配方进行物料准备,先加骨料再加细粉、外加剂、不锈钢纤维,在立轴行星式搅拌机内搅拌混合1~2min,待基本混合均匀后添加一定量的水,搅拌3~6min,随后将混合好的物料添加进入模具中经振动成型,同时使用线振动棒辅助振动及排气,其中加水量占混合料总重量的4%~7%;
S2、将成型后的挡渣墙连同模具一起置于50~80℃的环境中养护至少10h,待获得合适的脱膜强度后进行脱模,拆除模具取出挡渣墙,再在室温养护一定的时间;
S3、将养护后的挡渣墙置于干燥窑中,经室温升温至250~350℃进行干燥,整个干燥过程历经36~72h,经检查合格后包装入库,包装兼顾防潮和运输安全。
本发明的有益效果是:
(1)本发明主要采用回收耐火材料固体废弃资源,达到资源二次利用和获得经济环保效益的目的,生产成本大幅降低,同时生产出来的挡渣墙高温性能好,使用效果良好;
(2)本发明中使用回收镁铝碳砖颗粒、铝镁碳砖颗粒的挡渣墙具有良好的抗渣侵蚀性能,挡渣墙高温体积稳定性好,使用过程中线变化小,依据钢厂实际使用效果,可连续浇钢10h以上,钢种适应性强;
(3)本发明中使用炼钢用后废砖镁铝碳砖和铝镁碳砖,在一定程度上也开拓了预制件挡渣墙所需镁砂原料的来源,为资源供应压力下的原料提供了一种来源。
(4)本发明中使用的改性羧酸减水剂在一定程度上对耐火原料进行了改性,使得物料的表面润滑、流动性更好。
具体实施方式
实施例1
本实施例提供的一种循环经济型挡渣墙,其浇注料包括以下组分:1mm≤粒度≤3mm的回收镁铝碳砖再生料20%、3mm≤粒度≤10mm 的回收镁铝碳砖再生料40%,0mm≤粒度≤1mm的中挡镁砂14%、200目的中挡镁砂16%,活性氧化铝微粉3%,锆硅微粉4%,碳化硅细粉3%,不锈钢纤维1%,SD80改性羧酸类减水剂0.3%,六偏磷酸钠减水剂0.2%,硼酸缓凝剂0.02%。其中,回收镁铝碳砖再生料主要成分包括:C≥10%,MgO≥52%,Al2O3≤20%,SiO2≤5%,1%≤SiC≤3%。
其制备方法包括以下步骤:
S1、按照配方进行物料准备,先加骨料再加细粉、外加剂、不锈钢纤维,在立轴行星式搅拌机内搅拌混合1.5min,待基本混合均匀后添加一定量的水,搅拌4min,随后将混合好的物料添加进入模具中经振动成型,同时使用线振动棒辅助振动及排气,其中加水量占混合料总重量的4%~7%;
S2、将成型后的挡渣墙连同模具一起置于环境温度70℃左右的养护房环境中养护12h,待获得合适的脱膜强度后进行脱模,拆除模具取出挡渣墙,再在室温养护一定的时间;
S3、将养护后的挡渣墙置于干燥窑中,经室温升温至终温300℃并保温12h进行干燥,整个干燥过程历经56h,经检查合格后包装入库,包装兼顾防潮和运输安全。
挡渣墙性能:110℃*24h干燥后的体积密度大于2.55g/cm3,冷态抗折强度大于5MPa,冷态耐压强度大于40Mpa。在线作业温度保持在1525℃左右,作业时间达12h以上。
实施例2
本实施例提供的一种循环经济型挡渣墙,其浇注料包括以下组分:3mm≤粒度≤10mm的回收镁铝碳砖再生料40%,1mm≤粒度≤3mm的中挡镁砂20%、0mm≤粒度≤1mm的中挡镁砂15%、200目的中挡镁砂16%,活性氧化铝微粉3%,锆硅微粉4%,碳化硅细粉2%,不锈钢纤维1%,SD80改性羧酸类减水剂0.3%,六偏磷酸钠减水剂0.2%,硼酸缓凝剂0.02%。其中,回收镁铝碳砖再生料主要成分包括:C≥10%,MgO≥52%,Al2O3≤20%,SiO2≤5%,1%≤SiC≤3%。
其制备方法包括以下步骤:
S1、按照配方进行物料准备,先加骨料再加细粉、外加剂、不锈钢纤维,在立轴行星式搅拌机内搅拌混合1.5min,待基本混合均匀后添加一定量的水,搅拌4min,随后将混合好的物料添加进入模具中经震动成型,同时使用线振动棒辅助振动及排气,其中加水量占混合料总重量的4%~7%;
S2、将成型后的挡渣墙连同模具一起置于环境温度70℃左右的养护房环境中养护12h,待获得合适的脱膜强度后进行脱模,拆除模具取出挡渣墙,再在室温养护一定的时间;
S3、将养护后的挡渣墙置于干燥窑中,经室温升温至终温300℃并保温12h进行干燥,整个干燥过程历经56h,经检查合格后包装入库,包装兼顾防潮和运输安全。
挡渣墙性能:110℃*24h干燥后的体积密度大于2.7g/cm3,冷态抗折强度大于6MPa,冷态耐压强度大于55Mpa。在线作业温度保持在1525℃左右,作业时间达12h以上。
实施例3
本实施例提供的一种循环经济型挡渣墙,其浇注料包括以下组分:1mm≤粒度≤3mm的铝镁碳砖再生料22%、3mm≤粒度≤5mm 的铝镁碳砖再生料12%,5mm≤粒度≤8mm的中挡镁砂20%、0mm≤粒度≤1mm的中挡镁砂18%、200目的中挡镁砂17%,活性氧化铝微粉3%,锆硅微粉5%,碳化硅细粉3%,不锈钢纤维1%,SD80改性羧酸类减水剂0.5%,六偏磷酸钠减水剂0.1%,硼酸缓凝剂0.02%。其中,铝镁碳砖再生料主要成分包括:5%≤C≤10%、10%≤MgO≤25%、Al2O3≥60%、SiO2≤3%、2%≤SiC≤5%。
其制备方法包括以下步骤:
S1、按照配方进行物料准备,先加骨料再加细粉、外加剂、不锈钢纤维,在立轴行星式搅拌机内搅拌混合1.5min,待基本混合均匀后添加一定量的水,搅拌4min,随后将混合好的物料添加进入模具中经震动成型,同时使用线振动棒辅助振动及排气,其中加水量占混合料总重量的4%~7%;
S2、将成型后的挡渣墙连同模具一起置于环境温度70℃左右的养护房环境中养护12h,待获得合适的脱膜强度后进行脱模,拆除模具取出挡渣墙,再在室温养护一定的时间;
S3、将养护后的挡渣墙置于干燥窑中,经室温升温至终温300℃并保温12h进行干燥,整个干燥过程历经56h,经检查合格后包装入库,包装兼顾防潮和运输安全。
挡渣墙性能:110℃*24h干燥后的体积密度大于2.6g/cm3,冷态抗折强度大于5MPa,冷态耐压强度大于40Mpa。在线作业温度保持在1525℃左右,作业时间达10h以上。
实施例4
本实施例提供的一种循环经济型挡渣墙,其浇注料包括以下组分:1mm≤粒度≤3mm的回收报废的镁质挡渣墙破碎颗粒料20%、3mm≤粒度≤5mm 的回收报废的镁质挡渣墙破碎颗粒料10%、5mm≤粒度≤8mm 的回收报废的镁质挡渣墙破碎颗粒料22%,0mm≤粒度≤1mm的中挡镁砂20%、200目的中挡镁砂22%,活性氧化铝微粉2%,锆硅微粉4%,不锈钢纤维0.5%,六偏磷酸钠0.15%,硼酸缓凝剂0.02%。其中,回收报废的镁质挡渣墙再生料主要成分包括:MgO≥80%,SiO2≤15%。
其制备方法包括以下步骤:
S1、按照配方进行物料准备,先加骨料再加细粉、外加剂、不锈钢纤维,在立轴行星式搅拌机内搅拌混合1.5min,待基本混合均匀后添加一定量的水,搅拌4min,随后将混合好的物料添加进入模具中经震动成型,同时使用线振动棒辅助振动及排气,其中加水量占混合料总重量的4%~7%;
S2、将成型后的挡渣墙连同模具一起置于环境温度70℃左右的养护房环境中养护12h,待获得合适的脱膜强度后进行脱模,拆除模具取出挡渣墙,再在室温养护一定的时间;
S3、将养护后的挡渣墙置于干燥窑中,经室温升温至终温300℃并保温12h进行干燥,整个干燥过程历经56h,经检查合格后包装入库,包装兼顾防潮和运输安全。
挡渣墙性能:110℃*24h干燥后的体积密度大于2.75g/cm3,冷态抗折强度大于8MPa,冷态耐压强度大于60MPa。使用温度可达1525℃,在线作业时间10h以上。
各实施例中的性能指标检测方法参照YB/T 5201-1993。不锈钢纤维为国标耐热钢纤维446#。对于回收的镁铝碳砖/铝镁碳砖需要经过一定时间的风化水泡后,去除渣头后再经破碎磁选筛分成各分级粒度颗粒后备用;报废的镁质挡渣墙直接经破碎筛分后的颗粒备用。
综上所述,本发明主要拓展了镁质挡渣墙用原料的来源,更为炼钢熔炉用后固体废弃物机压定型砖钢包砖、电炉砖等及耐火材料企业生产过程产生的挡渣墙报废品的循环利用拓宽了途径,一定程度上起到了变废为宝、循环利用的作用,同时降低了生产成本。
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (10)
1.一种循环经济型挡渣墙,其特征在于:其浇注料包括如下组分:再生料30%~65%、中档镁砂25%~60%、氧化铝微粉0%~6%、碳化硅细粉2%~4%、硅微粉3%~4.5%、外加剂0.2%~2%、不锈钢纤维0.2%~1.5%。
2.根据权利要求1所述的一种循环经济型挡渣墙,其特征在于:所述再生料包括回收的镁铝碳砖颗粒、回收的铝镁碳砖颗粒、报废的镁质挡渣墙颗粒中的一种或多种。
3.根据权利要求2所述的一种循环经济型挡渣墙,其特征在于:若再生料采用所述镁铝碳砖颗粒或所述铝镁碳砖颗粒,其规格包括1mm≤粒度≤3mm、3mm≤粒度≤5mm、3mm≤粒度≤10mm中的一种或多种。
4.根据权利要求2所述的一种循环经济型挡渣墙,其特征在于:若再生料采用所述镁质挡渣墙颗粒,其规格包括1mm≤粒度≤3mm、3mm≤粒度≤5mm、5mm≤粒度≤8mm中的多种,或采用3mm≤粒度≤8mm复合粒度模式,或采用1mm≤粒度≤8mm复合粒度模式。
5.根据权利要求3所述的一种循环经济型挡渣墙,其特征在于:所述镁铝碳砖主要成分包括:C≥10%,MgO≥52%,Al2O3≤20%,SiO2≤5%,1%≤SiC≤3%。
6.根据权利要求3所述的一种循环经济型挡渣墙,其特征在于:所述铝镁碳砖主要成分包括:5%≤C≤10%,10%≤MgO≤25%,Al2O3≥60%,SiO2≤3%,2%≤SiC≤5%。
7.根据权利要求4所述的一种循环经济型挡渣墙,其特征在于:所述镁质挡渣墙主要成分包括:MgO≥80%,SiO2≤15%。
8.根据权利要求1所述的一种循环经济型挡渣墙,其特征在于:
所述中档镁砂中主要成分MgO≥91.5%;
所述氧化铝微粉中主要成分Al2O3≥99%,中位径D50≤3µm、粒度≤10µm;
所述碳化硅细粉中主要成分SiC≥95%,粒度≤74µm;
所述硅微粉中主要成分SiO2≥94%,中位径D50≤3µm、粒度≤35µm;
所述外加剂包括减水剂0.15%~0.3%、有机防爆纤维0.05%~0.15%和缓凝剂0.01%~0.1%。
9.根据权利要求8所述的一种循环经济型挡渣墙,其特征在于:所述减水剂为六偏磷酸钠和改性羧酸中的一种或两种,所述缓凝剂为硼酸。
10.一种循环经济型挡渣墙制备方法,其特征在于:应用于权利要求1-9任意一项,包括以下步骤:
S1、按照配方进行物料准备,先加骨料再加细粉、外加剂、不锈钢纤维,在立轴行星式搅拌机内搅拌混合1~2min,待基本混合均匀后添加一定量的水,搅拌3~6min,随后将混合好的物料添加进入模具中经振动成型,同时使用线振动棒辅助振动及排气,其中加水量占混合料总重量的4%~7%;
S2、将成型后的挡渣墙连同模具一起置于50~80℃的环境中养护至少10h,待获得合适的脱膜强度后进行脱模,拆除模具取出挡渣墙,再在室温养护一定的时间;
S3、将养护后的挡渣墙置于干燥窑中,经室温升温至250~350℃进行干燥,整个干燥过程历经36~72h,经检查合格后包装入库,包装兼顾防潮和运输安全。
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