CN113248241B - 一种锆刚玉的耐磨抗侵蚀复合砖及其生产工艺 - Google Patents
一种锆刚玉的耐磨抗侵蚀复合砖及其生产工艺 Download PDFInfo
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Abstract
本发明公开了一种锆刚玉的耐磨抗侵蚀复合砖及其生产工艺,所述复合砖包括以下原料:ZrSiO4、Al2O3、Al2(SiO4)O、MgCO3、Fe2O3、Sb2O3、Cr2O3、TiO2、MnO、CuO、Na2CO3、高岭土、环氧树脂、复合粘结剂、减水剂和结合剂;所述复合砖的制备方法为:首先称取原料,并粉碎混合,然后将粉碎后的物料与水混合,并研磨干燥处理,然后向研磨后的物料中加入环氧树脂、复合粘结剂、减水剂和结合剂,搅拌均匀,最后将混合物料压制成型,并进行干燥、烧制,即可得到复合砖成品;通过本发明制备的复合砖具有较高的致密性以及结合强度,抗渣侵蚀性能较强,适宜大量推广。
Description
技术领域
本发明涉及耐火材料技术领域,具体是涉及一种锆刚玉的耐磨抗侵蚀复合砖及其生产工艺。
背景技术
目前危废处置行业的焚烧系统耐火材料,多采用刚玉质、铬刚玉质、锆刚玉质等材质耐火砖筑炉,这类砖具有耐火、高荷重软化温度、耐磨性能、化学稳定性、热震稳定性及抗渣浸蚀性好等优点,可提高焚烧炉的使用寿命,提高生产率,降低生产成本。熔铸锆刚玉材料在熔窑上部结构内衬使用较广,可以提高熔窑寿命,满足玻璃熔化和澄清温度升高要求。
但是,现有技术中的锆刚玉复合砖在烧制过程中,各材料间结合强度低,致密性差,气孔高,导致复合砖的热震稳定性较差,抗渣浸蚀性能不够理想;同时,现有技术中锆刚玉复合砖在制备过程中,砖体内部应力较大,极易造成砖体开裂。
发明内容
针对上述存在的技术问题,本发明提供了一种结合强度高、致密性好的锆刚玉的耐磨抗侵蚀复合砖及其生产工艺。
本发明的技术方案为:一种锆刚玉的耐磨抗侵蚀复合砖,包括以下重量份的原料:ZrSiO4 28-45份、Al2O3 18-26份、Al2(SiO4)O 7-13份、MgCO3 5-12份、 Fe2O3 9-16份、Sb2O35-9份、Cr2O3 4-11份、TiO2 3-7份、MnO 2-5份、CuO 2-8 份、Na2CO3 4-9份、高岭土4-16份、环氧树脂7-16份、复合粘结剂0.5-1.2份、减水剂0.2-0.4份、结合剂1-1.5份;
结合剂为铬合磷酸盐结合剂;
复合粘结剂由水玻璃粘结剂和活性树脂粘接剂按照体积比1:1组成;
减水剂由木质素磺酸钙、环氧乙烷-环氧丙烷共聚物和亚硫酸氢钠按照体积比3:1:2组成。
一种锆刚玉的耐磨抗侵蚀复合砖的生产工艺,包括以下步骤:
S1、按比例称取ZrSiO4、Al2O3、Al2(SiO4)O、MgCO3、Fe2O3、Sb2O3、Cr2O3、 TiO2、MnO、CuO、Na2CO3和高岭土,混合均匀后粉碎,并过90-130目筛,获得混合物料细粉,备用;
S2、将步骤S1所得混合物料细粉与水按照体积比1:1-3混合均匀,得到混合浆料,然后将混合浆料使用球磨机研磨15-50min,使混合浆料细度达到 135-360目;最后将研磨后的浆料在350-700W的功率下微波加热干燥处理2-5h,使得浆料的含水率控制在25-45%,自然冷却至室温;
S3、向步骤S2所得浆料中依次加入环氧树脂、复合粘结剂、减水剂和结合剂,然后在900-1500r/min,700-900W条件下,超声搅拌15-45min,静置陈化 1-3h,得到混合湿料;
S4、将步骤S3所得混合湿料加入模具中在等静压机中在110-180℃条件下静压成型,控制等静压机工作压力为15-29MPa,成型砖坯自然养护25-40h,再在95-105℃的温度下干燥至含水率≤4%,得到复合砖初坯;
S5、将步骤S4所得复合砖初坯送入干燥窑进行干燥,控制干燥窑的温度为 480-690℃,干燥时间为3-5h,然后将干燥后的复合砖初坯放入烧制窑,控制烧制温度为800-1000℃,烧制时间为2-4h,出窑后自然冷却至室温后,即得复合砖成品。
进一步地,高岭土使用之前,采用5-8%浓度的氢氧化钠浸泡15-25min,然后在150-250℃温度条件下煅烧40-75min;通过对高岭土进行碱浸泡后高温煅烧,能改善高岭土的内部构造,进而提高复合砖的抗侵蚀性能。
进一步地,步骤S1完成后,对混合物料细粉进行压力喷雾造粒,二次颗粒在40-80目,并控制二次颗粒含水率2-8%,通过对混合物料进行二次粉碎,使得粉碎后的物料颗粒更加均匀,降低烧制后的复合砖的气孔率,提高复合砖的致密性。
进一步地,步骤S5中,干燥后的复合砖初坯放入烧制窑之前在300-400℃条件下,预热处理1-3h,通过对复合砖初坯进行预热处理,能够有效避免复合砖初在烧制过程中开裂,降低复合砖的次品率。
进一步地,步骤S5中,复合砖初烧制完成后,封闭烧制窑,并在1000-1200℃温度条件下继续烧制20-50min,当烧制窑内温度≤150℃后,打开烧制窑,通过以上操作能够提高复合砖的抗渣侵蚀性能。
进一步地,步骤S5中复合砖初坯干燥时,先以3-5℃/min的速率将复合砖初坯升温至250-380℃,保温0.5-1.5h,再以4-8℃/min的速率升温至380-450℃,保温1-3h,再以6-9℃/min的速率升温至450-690℃,保温0.5-1h;以不同的升温速率对复合砖初坯进行加热干燥,能够避免复合砖初坯加热过程中产生形变,提高复合砖初坯的结构强度。
进一步地,步骤S5完成后,将复合砖成品置入压力反应釜,充入浓度 0.5-2mol/L的碳化硅粉溶液至完全淹没复合砖成品,在0.1-0.8MPa条件下进行压力渗透20-40min,渗透完成后干燥处理,通过在复合砖成品表面通过压力渗透碳化硅粉,使得碳化硅粉在复合砖成品表面形成致密的隔热层,提高复合砖成品的耐压强度、抗侵蚀性能和热稳定性。
进一步地,步骤S1进行之前,将ZrSiO4、Al2O3和Al2(SiO4)O混合均匀,然后加入混合物料质量15-35%的氯化钠溶液,在800-1200r/min条件下干磨 8-20min,然后在800-1000W的红外功率下加热0.5-1.5h,冷却至室温后用蒸馏水洗涤至中性,并干燥处理,通过对ZrSiO4、Al2O3和Al2(SiO4)O进行以上操作,能够提高复合砖成品对抗重金属及重金属碱的能力,进而提高复合砖成品的抗侵蚀性能。
与现有技术相比,本发明的有益效果是:本发明在制备复合砖过程中,所用原材料来源广、成本低廉,而且本发明的制作过程低能、环保;同时本发明复合砖制备过程中,各材料间的结合强度高,致密性好,气孔率低,热震稳定性较好、抗渣浸蚀性能好,通过对ZrSiO4、Al2O3和Al2(SiO4)O进行干磨处理,以及对高岭土进行了碱浸泡以及高温煅烧处理,能改善高岭土的内部构造,提高了复合砖成品对抗重金属及重金属碱的能力,进而提高复合砖成品的抗侵蚀性能;本发明步骤步骤S5中以不同的升温速率对复合砖初坯进行加热干燥,避免复合砖初坯加热过程中产生形变,提高复合砖初坯的结构强度,同时对复合砖初坯进行预热处理,能够有效避免复合砖初在烧制过程中开裂,降低复合砖的次品率;复合砖初烧制完成后,封闭烧制窑继续对复合砖成品进行密封烧制,能够提高复合砖的抗渣侵蚀性能,通过在复合砖成品表面通过压力渗透碳化硅粉,使得碳化硅粉在复合砖成品表面形成致密的隔热层,提高复合砖成品的耐压强度、抗侵蚀性能和热稳定性。
具体实施方式
实施例1:一种锆刚玉的耐磨抗侵蚀复合砖,包括以下重量份的原料:ZrSiO4 28份、Al2O3 18份、Al2(SiO4)O 7份、MgCO3 5份、Fe2O3 9份、Sb2O3 5份、Cr2O3 4份、TiO2 3份、MnO2份、CuO 2份、Na2CO3 4份、高岭土4份、环氧树脂7 份、复合粘结剂0.5份、减水剂0.2份、结合剂1份;
结合剂为铬合磷酸盐结合剂;
复合粘结剂由水玻璃粘结剂和活性树脂粘接剂按照体积比1:1组成;
减水剂由木质素磺酸钙、环氧乙烷-环氧丙烷共聚物和亚硫酸氢钠按照体积比3:1:2组成。
一种锆刚玉的耐磨抗侵蚀复合砖的生产工艺,包括以下步骤:
S1、按比例称取ZrSiO4、Al2O3、Al2(SiO4)O、MgCO3、Fe2O3、Sb2O3、Cr2O3、 TiO2、MnO、CuO、Na2CO3和高岭土,混合均匀后粉碎,并过90-130目筛,获得混合物料细粉,备用;
S2、将步骤S1所得混合物料细粉与水按照体积比1:1混合均匀,得到混合浆料,然后将混合浆料使用球磨机研磨15min,使混合浆料细度达到135目;最后将研磨后的浆料在350W的功率下微波加热干燥处理2h,使得浆料的含水率控制在25%,自然冷却至室温;
S3、向步骤S2所得浆料中依次加入环氧树脂、复合粘结剂、减水剂和结合剂,然后在900r/min,700W条件下,超声搅拌15min,静置陈化1h,得到混合湿料;
S4、将步骤S3所得混合湿料加入模具中在等静压机中在110℃条件下静压成型,控制等静压机工作压力为15MPa,成型砖坯自然养护25h,再在95℃的温度下干燥至含水率为4%,得到复合砖初坯;
S5、将步骤S4所得复合砖初坯送入干燥窑进行干燥,控制干燥窑的温度为 480℃,干燥时间为3h,然后将干燥后的复合砖初坯放入烧制窑,控制烧制温度为800℃,烧制时间为2h,出窑后自然冷却至室温后,即得复合砖成品。
实施例2、一种锆刚玉的耐磨抗侵蚀复合砖,包括以下重量份的原料:ZrSiO4 32份、Al2O3 22份、Al2(SiO4)O 10份、MgCO3 9份、Fe2O3 12份、Sb2O3 8份、 Cr2O3 9份、TiO2 6份、MnO 4份、CuO 5份、Na2CO3 6份、高岭土13份、环氧树脂11份、复合粘结剂0.9份、减水剂0.3份、结合剂1.2份;
结合剂为铬合磷酸盐结合剂;
复合粘结剂由水玻璃粘结剂和活性树脂粘接剂按照体积比1:1组成;
减水剂由木质素磺酸钙、环氧乙烷-环氧丙烷共聚物和亚硫酸氢钠按照体积比3:1:2组成。
一种锆刚玉的耐磨抗侵蚀复合砖的生产工艺,包括以下步骤:
S1、按比例称取ZrSiO4、Al2O3、Al2(SiO4)O、MgCO3、Fe2O3、Sb2O3、Cr2O3、 TiO2、MnO、CuO、Na2CO3和高岭土,将ZrSiO4、Al2O3和Al2(SiO4)O混合均匀,然后加入混合物料质量15%的氯化钠溶液,在800r/min条件下干磨20min,然后在800W的红外功率下加热0.5h,冷却至室温后用蒸馏水洗涤至中性,并干燥处理,通过对ZrSiO4、Al2O3和Al2(SiO4)O进行以上操作,能够提高复合砖成品对抗重金属及重金属碱的能力,进而提高复合砖成品的抗侵蚀性能;将高岭土采用5%浓度的氢氧化钠浸泡15min,然后在150℃温度条件下煅烧40min;通过对高岭土进行碱浸泡后高温煅烧,能改善高岭土的内部构造,进而提高复合砖的抗侵蚀性能,然后将所有材料混合均匀后粉碎,并过90目筛,获得混合物料细粉,备用;
S2、将步骤S1所得压力喷雾造粒后的混合物料细粉与水按照体积比1:2混合均匀,得到混合浆料,然后将混合浆料使用球磨机研磨35min,使混合浆料细度达到290目;最后将研磨后的浆料在490W的功率下微波加热干燥处理4h,使得浆料的含水率控制在30%,自然冷却至室温;
S3、向步骤S2所得浆料中依次加入环氧树脂、复合粘结剂、减水剂和结合剂,然后在1200r/min,810W条件下,超声搅拌33min,静置陈化2h,得到混合湿料;
S4、将步骤S3所得混合湿料加入模具中在等静压机中在136℃条件下静压成型,控制等静压机工作压力为24MPa,成型砖坯自然养护30h,再在100℃的温度下干燥至含水率为3%,得到复合砖初坯;
S5、将步骤S4所得复合砖初坯送入干燥窑进行干燥,控制干燥窑的温度为 525℃,干燥时间为4h,然后将干燥后的复合砖初坯放入烧制窑,控制烧制温度为925℃,烧制时间为3h,出窑后自然冷却至室温后,即得复合砖成品。
实施例3、一种锆刚玉的耐磨抗侵蚀复合砖,包括以下重量份的原料:ZrSiO4 45份、Al2O3 26份、Al2(SiO4)O 13份、MgCO3 12份、Fe2O3 16份、Sb2O3 9份、 Cr2O3 11份、TiO2 7份、MnO 5份、CuO 8份、Na2CO3 9份、高岭土16份、环氧树脂16份、复合粘结剂1.2份、减水剂0.4份、结合剂1.5份;
结合剂为铬合磷酸盐结合剂;
复合粘结剂由水玻璃粘结剂和活性树脂粘接剂按照体积比1:1组成;
减水剂由木质素磺酸钙、环氧乙烷-环氧丙烷共聚物和亚硫酸氢钠按照体积比3:1:2组成。
一种锆刚玉的耐磨抗侵蚀复合砖的生产工艺,包括以下步骤:
S1、按比例称取ZrSiO4、Al2O3、Al2(SiO4)O、MgCO3、Fe2O3、Sb2O3、Cr2O3、 TiO2、MnO、CuO、Na2CO3和高岭土,将ZrSiO4、Al2O3和Al2(SiO4)O混合均匀,然后加入混合物料质量15%的氯化钠溶液,在800r/min条件下干磨20min,然后在800W的红外功率下加热0.5h,冷却至室温后用蒸馏水洗涤至中性,并干燥处理,通过对ZrSiO4、Al2O3和Al2(SiO4)O进行以上操作,能够提高复合砖成品对抗重金属及重金属碱的能力,进而提高复合砖成品的抗侵蚀性能;将高岭土采用8%浓度的氢氧化钠浸泡25min,然后在250℃温度条件下煅烧75min;通过对高岭土进行碱浸泡后高温煅烧,能改善高岭土的内部构造,进而提高复合砖的抗侵蚀性能,然后将所有材料混合均匀后粉碎,并过130目筛,获得混合物料细粉,备用;对混合物料细粉进行压力喷雾造粒,二次颗粒在80目,并控制二次颗粒含水率3%,通过对混合物料进行二次粉碎,使得粉碎后的物料颗粒更加均匀,降低烧制后的复合砖的气孔率,提高复合砖的致密性;
S2、将步骤S1所得压力喷雾造粒后的混合物料细粉与水按照体积比1:3混合均匀,得到混合浆料,然后将混合浆料使用球磨机研磨50min,使混合浆料细度达到360目;最后将研磨后的浆料在700W的功率下微波加热干燥处理5h,使得浆料的含水率控制在45%,自然冷却至室温;
S3、向步骤S2所得浆料中依次加入环氧树脂、复合粘结剂、减水剂和结合剂,然后在1500r/min,900W条件下,超声搅拌45min,静置陈化3h,得到混合湿料;
S4、将步骤S3所得混合湿料加入模具中在等静压机中在180℃条件下静压成型,控制等静压机工作压力为29MPa,成型砖坯自然养护40h,再在105℃的温度下干燥至含水率为4%,得到复合砖初坯;
S5、将步骤S4所得复合砖初坯送入干燥窑进行干燥,控制干燥窑的温度为 690℃,干燥时间为5h,然后将干燥后的复合砖初坯放入烧制窑,控制烧制温度为1000℃,烧制时间为4h,出窑后自然冷却至室温后,即得复合砖成品。
实施例4、一种锆刚玉的耐磨抗侵蚀复合砖,包括以下重量份的原料:ZrSiO4 28份、Al2O3 18-份、Al2(SiO4)O 7份、MgCO3 5份、Fe2O3 9份、Sb2O3 5份、Cr2O3 4份、TiO2 3份、MnO 2份、CuO 2份、Na2CO3 4份、高岭土4份、环氧树脂7 份、复合粘结剂0.5份、减水剂0.2份、结合剂1份;
结合剂为铬合磷酸盐结合剂;
复合粘结剂由水玻璃粘结剂和活性树脂粘接剂按照体积比1:1组成;
减水剂由木质素磺酸钙、环氧乙烷-环氧丙烷共聚物和亚硫酸氢钠按照体积比3:1:2组成。
一种锆刚玉的耐磨抗侵蚀复合砖的生产工艺,包括以下步骤:
S1、按比例称取ZrSiO4、Al2O3、Al2(SiO4)O、MgCO3、Fe2O3、Sb2O3、Cr2O3、 TiO2、MnO、CuO、Na2CO3和高岭土,混合均匀后粉碎,并过90-130目筛,获得混合物料细粉,备用;
S2、将步骤S1所得混合物料细粉与水按照体积比1:2混合均匀,得到混合浆料,然后将混合浆料使用球磨机研磨32min,使混合浆料细度达到245目;最后将研磨后的浆料在490W的功率下微波加热干燥处理4h,使得浆料的含水率控制在32%,自然冷却至室温;
S3、向步骤S2所得浆料中依次加入环氧树脂、复合粘结剂、减水剂和结合剂,然后在1250r/min,825W条件下,超声搅拌30min,静置陈化2h,得到混合湿料;
S4、将步骤S3所得混合湿料加入模具中在等静压机中在136℃条件下静压成型,控制等静压机工作压力为25MPa,成型砖坯自然养护36h,再在105℃的温度下干燥至含水率为3%,得到复合砖初坯;
S5、将步骤S4所得复合砖初坯送入干燥窑进行干燥,先以3℃/min的速率将复合砖初坯升温至250℃,保温0.5h,再以4℃/min的速率升温至380℃,保温1h,再以6℃/min的速率升温至450℃,保温0.5h;以不同的升温速率对复合砖初坯进行加热干燥,能够避免复合砖初坯加热过程中产生形变,提高复合砖初坯的结构强度;干燥后的复合砖初坯放入烧制窑之前在300℃条件下,预热处理1h,通过对复合砖初坯进行预热处理,能够有效避免复合砖初在烧制过程中开裂,降低复合砖的次品率;然后将干燥后的复合砖初坯放入烧制窑,控制烧制温度为1000℃,烧制时间为4h,出窑后自然冷却至室温后,即得复合砖成品。
实施例5、一种锆刚玉的耐磨抗侵蚀复合砖,包括以下重量份的原料:ZrSiO4 45份、Al2O3 26份、Al2(SiO4)O 13份、MgCO3 12份、Fe2O3 16份、Sb2O3 9份、 Cr2O3 11份、TiO2 7份、MnO 5份、CuO 8份、Na2CO3 9份、高岭土16份、环氧树脂16份、复合粘结剂1.2份、减水剂0.4份、结合剂1.5份;
结合剂为铬合磷酸盐结合剂;
复合粘结剂由水玻璃粘结剂和活性树脂粘接剂按照体积比1:1组成;
减水剂由木质素磺酸钙、环氧乙烷-环氧丙烷共聚物和亚硫酸氢钠按照体积比3:1:2组成。
一种锆刚玉的耐磨抗侵蚀复合砖的生产工艺,包括以下步骤:
S1、按比例称取ZrSiO4、Al2O3、Al2(SiO4)O、MgCO3、Fe2O3、Sb2O3、Cr2O3、 TiO2、MnO、CuO、Na2CO3和高岭土,混合均匀后粉碎,并过130目筛,获得混合物料细粉,备用;
S2、将步骤S1所得混合物料细粉与水按照体积比1:3混合均匀,得到混合浆料,然后将混合浆料使用球磨机研磨50min,使混合浆料细度达到360目;最后将研磨后的浆料在700W的功率下微波加热干燥处理5h,使得浆料的含水率控制在45%,自然冷却至室温;
S3、向步骤S2所得浆料中依次加入环氧树脂、复合粘结剂、减水剂和结合剂,然后在1500r/min,900W条件下,超声搅拌45min,静置陈化2h,得到混合湿料;
S4、将步骤S3所得混合湿料加入模具中在等静压机中在180℃条件下静压成型,控制等静压机工作压力为29MPa,成型砖坯自然养护40h,再在105℃的温度下干燥至含水率为4%,得到复合砖初坯;
S5、将步骤S4所得复合砖初坯送入干燥窑进行干燥,先以4℃/min的速率将复合砖初坯升温至300℃,保温1h,再以6℃/min的速率升温至425℃,保温 2h,再以8℃/min的速率升温至480℃,保温1h;以不同的升温速率对复合砖初坯进行加热干燥,能够避免复合砖初坯加热过程中产生形变,提高复合砖初坯的结构强度;干燥后的复合砖初坯放入烧制窑之前在320℃条件下,预热处理2h,通过对复合砖初坯进行预热处理,能够有效避免复合砖初在烧制过程中开裂,降低复合砖的次品率;然后将干燥后的复合砖初坯放入烧制窑,控制烧制温度为 925℃,烧制时间为3h,复合砖初烧制完成后,封闭烧制窑,并在1100℃温度条件下继续烧制40min,当烧制窑内温度为150℃后,打开烧制窑,通过以上操作能够提高复合砖的抗渣侵蚀性能;出窑后自然冷却至室温后,即得复合砖成品,最后将复合砖成品置入压力反应釜,充入浓度0.5mol/L的碳化硅粉溶液至完全淹没复合砖成品,在0.1MPa条件下进行压力渗透20min,渗透完成后干燥处理,通过在复合砖成品表面通过压力渗透碳化硅粉,使得碳化硅粉在复合砖成品表面形成致密的隔热层,提高复合砖成品的耐压强度、抗侵蚀性能和热稳定性。
实施例6、一种锆刚玉的耐磨抗侵蚀复合砖,包括以下重量份的原料:ZrSiO4 33份、Al2O3 25份、Al2(SiO4)O 11份、MgCO3 9份、Fe2O3 13份、Sb2O3 8份、 Cr2O3 8份、TiO2 6份、MnO 2份、CuO 5份、Na2CO3 7份、高岭土11份、环氧树脂12份、复合粘结剂1份、减水剂0.3份、结合剂1.2份;
结合剂为铬合磷酸盐结合剂;
复合粘结剂由水玻璃粘结剂和活性树脂粘接剂按照体积比1:1组成;
减水剂由木质素磺酸钙、环氧乙烷-环氧丙烷共聚物和亚硫酸氢钠按照体积比3:1:2组成。
一种锆刚玉的耐磨抗侵蚀复合砖的生产工艺,包括以下步骤:
S1、按比例称取ZrSiO4、Al2O3、Al2(SiO4)O、MgCO3、Fe2O3、Sb2O3、Cr2O3、 TiO2、MnO、CuO、Na2CO3和高岭土,将ZrSiO4、Al2O3和Al2(SiO4)O混合均匀,然后加入混合物料质量35%的氯化钠溶液,在1200r/min条件下干磨20min,然后在1000W的红外功率下加热1.5h,冷却至室温后用蒸馏水洗涤至中性,并干燥处理,通过对ZrSiO4、Al2O3和Al2(SiO4)O进行以上操作,能够提高复合砖成品对抗重金属及重金属碱的能力,进而提高复合砖成品的抗侵蚀性能;将高岭土采用8%浓度的氢氧化钠浸泡25min,然后在150℃温度条件下煅烧75min;通过对高岭土进行碱浸泡后高温煅烧,能改善高岭土的内部构造,进而提高复合砖的抗侵蚀性能,然后将所有材料混合均匀后粉碎,并过130目筛,获得混合物料细粉,备用;对混合物料细粉进行压力喷雾造粒,二次颗粒在80目,并控制二次颗粒含水率为5%,通过对混合物料进行二次粉碎,使得粉碎后的物料颗粒更加均匀,降低烧制后的复合砖的气孔率,提高复合砖的致密性;
S2、将步骤S1所得压力喷雾造粒后的混合物料细粉与水按照体积比1:2混合均匀,得到混合浆料,然后将混合浆料使用球磨机研磨36min,使混合浆料细度达到280目;最后将研磨后的浆料在450W的功率下微波加热干燥处理4h,使得浆料的含水率控制在33%,自然冷却至室温;
S3、向步骤S2所得浆料中依次加入环氧树脂、复合粘结剂、减水剂和结合剂,然后在1360r/min,900W条件下,超声搅拌45min,静置陈化3h,得到混合湿料;
S4、将步骤S3所得混合湿料加入模具中在等静压机中在180℃条件下静压成型,控制等静压机工作压力为29MPa,成型砖坯自然养护40h,再在105℃的温度下干燥至含水率为4%,得到复合砖初坯;
S5、将步骤S4所得复合砖初坯送入干燥窑进行干燥,先以5℃/min的速率将复合砖初坯升温至380℃,保温1.5h,再以8℃/min的速率升温至450℃,保温3h,再以9℃/min的速率升温至690℃,保温1h;以不同的升温速率对复合砖初坯进行加热干燥,能够避免复合砖初坯加热过程中产生形变,提高复合砖初坯的结构强度;干燥后的复合砖初坯放入烧制窑之前在400℃条件下,预热处理 3h,通过对复合砖初坯进行预热处理,能够有效避免复合砖初在烧制过程中开裂,降低复合砖的次品率;然后将干燥后的复合砖初坯放入烧制窑,控制烧制温度为 1000℃,烧制时间为4h,复合砖初烧制完成后,封闭烧制窑,并在1200℃温度条件下继续烧制50min,当烧制窑内温度下降到120℃后,打开烧制窑,通过以上操作能够提高复合砖的抗渣侵蚀性能;出窑后自然冷却至室温后,即得复合砖成品,最后将复合砖成品置入压力反应釜,充入浓度2mol/L的碳化硅粉溶液支完全淹没复合砖成品,在0.8MPa条件下进行压力渗透40min,渗透完成后干燥处理,通过在复合砖成品表面通过压力渗透碳化硅粉,使得碳化硅粉在复合砖成品表面形成致密的隔热层,提高复合砖成品的耐压强度、抗侵蚀性能和热稳定性。
试验例:对实施例1-6所得复合砖成品进行相关性能检测,结果如表1所示;
表1:不同条件下复合砖成品相关性能检测结果;
通过表1数据对比可知,实施例2中,由于将ZrSiO4、Al2O3和Al2(SiO4)O 混合均匀,然后加入混合物料治疗15%的氯化钠溶液,在800r/min条件下干磨 20min,然后800W的红外功率下加热0.5h,冷却至室温后用蒸馏水洗涤至中性,并干燥处理;以及对高岭土进行了碱浸泡以及高温煅烧处理,能改善高岭土的内部构造,提高了复合砖成品对抗重金属及重金属碱的能力,进而提高复合砖成品的抗侵蚀性能;实施例3中,由于对步骤S1得到的混合物料细粉进行压力喷雾造粒,使得粉碎后的物料颗粒更加均匀,降低了烧制后的复合砖的气孔率,提高复合砖的致密性,进而提高了复合砖成品的结构强度;实施例4中,由于在步骤S5中以不同的升温速率对复合砖初坯进行加热干燥,避免复合砖初坯加热过程中产生形变,提高复合砖初坯的结构强度,同时对复合砖初坯进行预热处理,能够有效避免复合砖初在烧制过程中开裂,降低复合砖的次品率;实施例5中,由于在步骤S5中,复合砖初烧制完成后,封闭烧制窑继续对复合砖成品进行密封烧制,能够提高复合砖的抗渣侵蚀性能,通过在复合砖成品表面通过压力渗透碳化硅粉,使得碳化硅粉在复合砖成品表面形成致密的隔热层,提高复合砖成品的耐压强度、抗侵蚀性能和热稳定性,实施例6中,通过对各反应步骤进行综合优化,使所得复合砖成品的各项性能都得到了进一步的提升。
Claims (1)
1.一种锆刚玉的耐磨抗侵蚀复合砖,其特征在于,包括以下重量份的原料:ZrSiO4 28-45份、Al2O3 18-26份、Al2(SiO4)O 7-13份、MgCO3 5-12份、Fe2O3 9-16份、Sb2O3 5-9份、Cr2O34-11份、TiO2 3-7份、MnO 2-5份、CuO 2-8份、Na2CO34-9份、高岭土4-16份、环氧树脂7-16份、复合粘结剂0.5-1.2份、减水剂0.2-0.4份、结合剂1-1.5份;
所述结合剂为铬合磷酸盐结合剂;
所述复合粘结剂由水玻璃粘结剂和活性树脂粘接剂按照体积比1:1组成;
所述减水剂由木质素磺酸钙、环氧乙烷-环氧丙烷共聚物和亚硫酸氢钠按照体积比3:1:2组成;
所述复合砖的生产工艺,包括以下步骤:
S1、按比例称取所述ZrSiO4、Al2O3、Al2(SiO4)O、MgCO3、Fe2O3、Sb2O3、Cr2O3、TiO2、MnO、CuO、Na2CO3和高岭土,混合均匀后粉碎,并过90-130目筛,获得混合物料细粉,备用;
S2、将步骤S1所得混合物料细粉与水按照体积比1:1-3混合均匀,得到混合浆料,然后将所述混合浆料使用球磨机研磨15-50min,使混合浆料细度达到135-360目;最后将研磨后的浆料在350-700W的功率下微波加热干燥处理2-5h,使得浆料的含水率控制在25-45%,自然冷却至室温;
S3、向步骤S2所得浆料中依次加入所述环氧树脂、复合粘结剂、减水剂和结合剂,然后在900-1500r/min,700-900W条件下,超声搅拌15-45min,静置陈化1-3h,得到混合湿料;
S4、将步骤S3所得混合湿料加入模具中在等静压机中在110-180℃条件下静压成型,控制等静压机工作压力为15-29MPa,成型砖坯自然养护25-40h,再在95-105℃的温度下干燥至含水率≤4%,得到复合砖初坯;
S5、将步骤S4所得复合砖初坯送入干燥窑进行干燥,控制干燥窑的温度为480-690℃,干燥时间为3-5h,然后将干燥后的复合砖初坯放入烧制窑,控制烧制温度为800-1000℃,烧制时间为2-4h,出窑后自然冷却至室温后,即得复合砖成品;
步骤S1完成后,对所述混合物料细粉进行压力喷雾造粒,二次颗粒在40-80目,并控制二次颗粒含水率2-8%;
步骤S5中,所述干燥后的复合砖初坯放入烧制窑之前在300-400℃条件下,预热处理1-3h;
步骤S5中复合砖初坯干燥时,先以3-5℃/min的速率将复合砖初坯升温至250-380℃,保温0.5-1.5h,再以4-8℃/min的速率升温至380-450℃,保温1-3h,再以6-9℃/min的速率升温至450-690℃,保温0.5-1h;
所述高岭土使用之前,采用5-8%浓度的氢氧化钠浸泡15-25min,然后在150-250℃温度条件下煅烧40-75min;
步骤S5中,复合砖初烧制完成后,封闭烧制窑,并在1000-1200℃温度条件下继续烧制20-50min,当烧制窑内温度≤150℃后,打开烧制窑;
步骤S5完成后,将所述复合砖成品置入压力反应釜,充入浓度0.5-2mol/L的碳化硅粉溶液至完全淹没复合砖成品,在0.1-0.8MPa条件下进行压力渗透20-40min,渗透完成后干燥处理;
步骤S1进行之前,将所述ZrSiO4、Al2O3和Al2(SiO4)O混合均匀,然后加入混合物料质量15-35%的氯化钠溶液,在800-1200r/min条件下干磨8-20min,然后在800-1000W的红外功率下加热0.5-1.5h,冷却至室温后用蒸馏水洗涤至中性,并干燥处理。
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