CN114455956A - 一种煤下铝土矿制备电熔莫来石的方法 - Google Patents
一种煤下铝土矿制备电熔莫来石的方法 Download PDFInfo
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- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 71
- 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 title claims abstract description 60
- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 60
- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 25
- 239000011707 mineral Substances 0.000 claims abstract description 25
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- 238000002844 melting Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 11
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- 238000010891 electric arc Methods 0.000 claims abstract description 10
- 238000001354 calcination Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 4
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- 239000011593 sulfur Substances 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 238000007885 magnetic separation Methods 0.000 claims description 8
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- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 3
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 9
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
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- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229910052622 kaolinite Inorganic materials 0.000 description 2
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- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
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- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
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- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910052903 pyrophyllite Inorganic materials 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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Abstract
本发明提出了一种煤下铝土矿制备电熔莫来石的方法,所述方法包括以下步骤:对煤下铝土矿进行分级,剔除<d粒级矿物,获得+d粒级矿物,+d粒级矿物采用X射线选矿机除铁脱硫,得到中间矿物;将中间矿物进行煅烧,得到铝矾土熟料;将铝矾土熟料进行破碎,然后添加辅料,混合均匀,得到配合料;将配合料在电弧炉中高温熔融,冷却析晶,再经破碎、分级、除铁,得到莫来石产品。本发明采用煤下铝土矿为主要原料生产电熔莫来石,莫来石产品中莫来石相含量95%以上,提高了煤下铝资源综合利用率及产品附加值,拓宽莫来石原料渠道,有力支撑耐火材料工业可持续高质量发展。
Description
技术领域
本发明涉及耐火材料技术领域,特别是指一种煤下铝土矿制备电熔莫来石的方法。
背景技术
耐火材料是用作高温窑炉等热工设备的结构材料以及工业用的高温容器和部件,是钢铁、有色、石化、建材、机械、电力、环保乃至国防等涉及高温工业的重要基础材料,也是各种高温工业热工窑炉和装备不可或缺的重要支撑材料。耐火材料工业的科学进步与技术发展对高温工业的发展起着不可替代的重要作用。其中,莫来石是高质量的耐火材料,具有很高的化学稳定性,在碳酸性熔剂、碱性熔剂及玻璃熔融体中都表现出较强的抗侵蚀能力,被广泛应用于冶金、玻璃、陶瓷、化学、电力、国防、燃气和水泥等工业上;同时莫来石也是高档耐火材料的原材料,用莫来石作成的耐火材料制品具有很高的机械强度,高的密度和荷重变形温度,较小的气孔率,抗热震性能好等特点,应用范围非常广泛。
我国耐火铝矾土资源丰富,而作为莫来石主要原料之一的优质高铝矾土储量却有限,再加上长期的不合理开采,导致优质原料出现了供应方面的问题。如此同时,我国的煤系地层下铝土矿资源储量极大,如河南省和山西省就拥有丰富的煤下铝资源,如何开发利用煤下铝资源,对于提高资源综合利用率、支撑铝工业高质量发展、保障国家能源资源安全具有重要意义。
煤下铝土矿禀赋不如常规铝土矿,一般铝含量低,铁硫等杂质含量高,开发利用存在一定的技术难题和经济效益问题。煤下铝土矿中Al2O3主要来源于一水硬铝石,少量赋存于高岭石、水云母、蒙脱石等粘土矿类物中;SiO2主要来源于叶腊石、伊利石、高岭石、水云母、蒙脱石、绿泥石等粘土矿物和石英、硅质岩屑中;Fe2O3主要来自赤铁矿、磁铁矿、针铁矿、黄铁矿、菱铁矿等;TiO2主要来源于锐钛矿、金红石等;S主要来源于黄铁矿。如何经济高效的除去或降低Fe2O3、Na2O、S等影响耐火材料质量的杂质含量是一大技术难题。
发明内容
本发明提出一种煤下铝土矿制备电熔莫来石的方法,采用煤下铝土矿为主要原料生产电熔莫来石,莫来石产品中莫来石相含量95%以上。
本发明的技术方案是这样实现的:一种煤下铝土矿制备电熔莫来石的方法,包括以下步骤:
(1)对煤下铝土矿进行分级,剔除<d粒级矿物,获得+d粒级矿物,+d粒级矿物采用X射线选矿机除铁脱硫,得到中间矿物;
(2)将中间矿物进行煅烧,得到铝矾土熟料;
(3)将铝矾土熟料进行破碎,然后添加辅料,混合均匀,得到配合料;
(4)将配合料在电弧炉中高温熔融,冷却析晶,再经破碎、分级、除铁,得到莫来石产品。
进一步地,步骤(1)中,煤下铝土矿中,Al2O3的含量为50-70wt%,Na2O+K2O的含量为≤0.5wt%,若是原料中Na2O、K2O的含量较大,会降低液相形成温度,增大液相产生量,阻碍莫来石化的进行,并且分解己经形成的莫来石。
进一步地,步骤(1)中,对煤下铝土矿进行分级,分级粒度d为1-5mm。
进一步地,步骤(1)中,X射线选矿机的分选阈值为0.05~0.15。
进一步地,步骤(2)中,煅烧采用回转窑,煅烧温度为1150℃-1300℃,煅烧时间为3-5h。
进一步地,步骤(3)中,铝矾土熟料的破碎粒度≤1.5mm。
进一步地,步骤(3)中,配合料包括以下原料:70-100wt%的铝矾土熟料、0-30wt%的硅石、0~3wt%的焦炭或木炭和0~1wt%的木屑,硅石中SiO2的含量≥98wt%。
进一步地,步骤(4)中,电弧炉中高温熔融的条件为:电压150-200V,电流1500-2000A,熔融温度为1850℃-2200℃,熔融时间为0.5-1.5h。
进一步地,步骤(4)中,冷却时间为24-48h;
进一步地,步骤(4)中,破碎、分级、除铁的具体方法如下:先采用颚式破碎机粗碎,对辊破碎机细碎,然后振动筛分级,最后采用磁选除铁,磁场强度为60-150KA/m。
本发明的有益效果:
(1)本发明采用煤下铝土矿为主要原料生产电熔莫来石,提高了煤下铝资源综合利用率及产品附加值,拓宽莫来石原料渠道,有力支撑耐火材料工业可持续高质量发展;
(2)本发明采用X射线智能分选机除铁脱硫提质降杂,处理量大,分选效率高,节能降耗,降低成本,提升矿山效率和经济效益;
(3)制备电熔莫来石的熔融过程中,辅料焦炭(木炭)、木屑作为还原剂、起弧料,其中2SiO2+Fe2O3+7C=2FeSi+7CO,铁的氧化物还原成硅铁,再通过磁选工艺进一步除铁,使得产品中铁含量达到莫来石产品质量要求;
(4)本发明制备的电熔莫来石,晶体发育良好,莫来石相含量95%以上,体积密度>2.9g/cm3,耐火度≥1800℃,具有优秀稳定的抗热震性能及耐磨性能。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本发明煤下铝土矿制备电熔莫来石方法的流程图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有付出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1
如图1所示,一种煤下铝土矿制备电熔莫来石的方法,具体为:
(1)煤下铝土矿主要成分,w(Al2O3)为54.40%,w(SiO2)为19.35%,w(Fe2O3)为7.34%,w(S)为0.52%,w(TiO2)为2.50%,w(Na2O+K2O)为0.48%;煤下铝土矿分级剔除<3mm粒级后,采用X射线智能选矿机进一步除铁降杂,分选阈值为0.05,w(Fe2O3)降到4.06%,w(S)降到0.11%,得到中间矿物;
(2)将中间矿物送入回转窑煅烧时间为4h,煅烧温度为1150℃,得到铝矾土熟料;
(3)铝矾土熟料破碎至≤1.5mm,然后将90wt%的铝矾土熟料、7.0wt%硅石、1.8wt%焦炭(木炭)和1.2wt%木屑混匀后,得到配合料;
(4)将配合料送入1950℃电弧炉高温熔融1.5h;冷却24h后,破碎、分级、磁选除铁(磁场强度为90KA/m)得到莫来石产品。莫来石产品中,w(Al2O3)为67.80%、w(SiO2)为25.94%,w(Fe2O3)为0.73%、w(TiO2)为3.07%、w(Na2O+K2O)为0.41%,莫来石相含量95%以上,体积密度2.96g/cm3,耐火度≥1800℃。
实施例2
如图1所示,一种煤下铝土矿制备电熔莫来石的方法,具体为:
(1)煤下铝土矿主要成分,w(Al2O3)为59.12%,w(SiO2)为14.37%,w(Fe2O3)为3.38%,w(S)为0.36%,w(TiO2)为2.25%,w(Na2O+K2O)为0.44%;煤下铝土矿分级剔除<3mm粒级后,采用X射线智能选矿机进一步除铁降杂,分选阈值为0.10,w(Fe2O3)降到2.71%,w(S)降到0.09%,得到中间矿物;
(2)将中间矿物随后送入回转窑煅烧时间为5h,煅烧温度为1200℃,得到铝矾土熟料;
(3)铝矾土熟料破碎至小于1.5mm,然后将88wt%的铝矾土熟料、9.5%wt的硅石、1.5%wt的焦炭(木炭)和1wt%的木屑配比混匀后,得到配合料;
(4)将配合料送入2000℃电弧炉高温熔融0.9h;冷却35h后破碎、分级、磁选除铁(磁场强度为80KA/m),得到莫来石产品。莫来石产品中,w(Al2O3)为71.31%、w(SiO2)为22.34%,w(Fe2O3)为0.56%、w(TiO2)为2.74%、w(Na2O+K2O)为0.38%,莫来石相含量95%以上,体积密度3.00g/cm3,耐火度≥1800℃。
实施例3
如图1所示,一种煤下铝制备电熔莫来石的方法,具体为:
(1)煤下铝土矿主要成分,w(Al2O3)为64.24%,w(SiO2)为14.70%,w(Fe2O3)为2.12%,w(S)为0.27%,w(TiO2)为2.55%,w(Na2O+K2O)为0.47%;煤下铝土矿分级剔除<3mm粒级后采用X射线智能选矿机进一步除铁降杂,分选阈值为0.05,w(Fe2O3)降到1.6%,w(S)降到0.06%,得到中间矿物;
(2)中间矿物随后送入回转窑煅烧时间为3h,煅烧温度为1250℃,得到铝矾土熟料;
(3)铝矾土熟料破碎至小于1.5mm,然后将90wt%的铝矾土熟料、8.5wt%的硅石、1.0wt%焦炭(木炭)和0.5wt%木屑配比混匀,得到配合料;
(4)配合料送入2050℃电弧炉高温熔融0.7h;冷却40h后破碎、分级、磁选除铁(磁场强度为70KA/m)得到莫来石产品。莫来石产品中,w(Al2O3)为71.76%、w(SiO2)为21.67%,w(Fe2O3)为0.54%、w(TiO2)为3.12%、w(Na2O+K2O)为0.40%,莫来石相含量95%以上,体积密度3.01g/cm3,耐火度≥1800℃。
实施例4
如图1所示,一种煤下铝制备电熔莫来石的方法,具体为:
(1)煤下铝土矿主要成分,w(Al2O3)为58.69%,w(SiO2)为23.68%,w(Fe2O3)为1.55%,w(S)为0.16%,w(TiO2)为2.04%,w(Na2O+K2O)为0.49%;煤下铝土矿分级剔除<3mm粒级后采用X射线智能选矿机进一步除铁降杂,分选阈值为0.15,w(Fe2O3)降到1.03%,w(S)降到0.05%,得到中间矿物;
(2)中间矿物随后送入回转窑煅烧时间为4h,煅烧温度为1250℃,得到铝矾土熟料;
(3)铝矾土熟料破碎至小于1.5mm,然后将100wt%的铝矾土熟料混匀,得到配合料;
(4)配合料送入2100℃电弧炉高温熔融0.8h;冷却42h后破碎、分级、磁选除铁(磁场强度为150KA/m)得到莫来石产品。莫来石产品中,w(Al2O3)为70.86%、w(SiO2)为25.42%,w(Fe2O3)为0.51%、w(TiO2)为2.22%、w(Na2O+K2O)为0.41%,莫来石相含量95%以上,体积密度2.98g/cm3,耐火度≥1800℃。
实施例5
如图1所示,一种煤下铝制备电熔莫来石的方法,具体为:
(1)煤下铝土矿主要成分,w(Al2O3)为69.73%,w(SiO2)为9.85%,w(Fe2O3)为3.2%,w(S)为0.28%,w(TiO2)为2.6%,w(Na2O+K2O)为0.47%;煤下铝土矿分级剔除<3mm粒级后采用X射线智能选矿机进一步除铁降杂,分选阈值为0.08,w(Fe2O3)降到2.57%,w(S)降到0.07%,得到中间矿物;
(2)中间矿物随后送入回转窑煅烧时间为3h,煅烧温度为1300℃,得到铝矾土熟料;
(3)铝矾土熟料破碎至小于1.5mm,然后将70wt%的铝矾土熟料、26wt%的硅石、3.0wt%焦炭(木炭)和1.0wt%木屑配比混匀,得到配合料;
(4)配合料送入2200℃电弧炉高温熔融0.6h;冷却48h后破碎、分级、磁选除铁(磁场强度为60KA/m)得到莫来石产品。莫来石产品中,w(Al2O3)为66.37%、w(SiO2)为27.61%,w(Fe2O3)为0.56%、w(TiO2)为3.01%、w(Na2O+K2O)为0.42%,莫来石相含量95%以上,体积密度2.95g/cm3,耐火度≥1800℃。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (10)
1.一种煤下铝土矿制备电熔莫来石的方法,其特征在于,包括以下步骤:
(1)对煤下铝土矿进行分级,剔除<d粒级矿物,获得+d粒级矿物,+d粒级矿物采用X射线选矿机除铁脱硫,得到中间矿物;
(2)将中间矿物进行煅烧,得到铝矾土熟料;
(3)将铝矾土熟料进行破碎,然后添加辅料,混合均匀,得到配合料;
(4)将配合料在电弧炉中高温熔融,冷却析晶,再经破碎、分级、除铁,得到莫来石产品。
2.根据权利要求1所述的一种煤下铝土矿制备电熔莫来石的方法,其特征在于,步骤(1)中,煤下铝土矿中,Al2O3的含量为50-70wt%,Na2O+K2O的含量为≤0.5wt%。
3.根据权利要求1所述的一种煤下铝土矿制备电熔莫来石的方法,其特征在于,步骤(1)中,对煤下铝土矿进行分级,分级粒度d为1-5mm。
4.根据权利要求1所述的一种煤下铝土矿制备电熔莫来石的方法,其特征在于,步骤(1)中,X射线选矿机的分选阈值为0.05~0.15。
5.根据权利要求1所述的一种煤下铝土矿制备电熔莫来石的方法,其特征在于,步骤(2)中,煅烧采用回转窑,煅烧温度为1150℃-1300℃,煅烧时间为3-5h。
6.根据权利要求1所述的一种煤下铝土矿制备电熔莫来石的方法,其特征在于,步骤(3)中,铝矾土熟料的破碎粒度≤1.5mm。
7.根据权利要求1所述的一种煤下铝土矿制备电熔莫来石的方法,其特征在于,步骤(3)中,配合料包括以下原料:70-100wt%的铝矾土熟料、0-30wt%的硅石、0~3wt%的焦炭或木炭和0~1wt%的木屑,硅石中SiO2的含量≥98wt%。
8.根据权利要求1所述的一种煤下铝土矿制备电熔莫来石的方法,其特征在于,步骤(4)中,电弧炉中高温熔融的条件为:电压150-200V,电流1500-2000A,熔融温度为1850℃-2200℃,熔融时间为0.5-1.5h。
9.根据权利要求1所述的一种煤下铝土矿制备电熔莫来石的方法,其特征在于,步骤(4)中,冷却时间为24-48h。
10.根据权利要求1所述的一种煤下铝土矿制备电熔莫来石的方法,其特征在于,步骤(4)中,破碎、分级、除铁的具体方法如下:先采用颚式破碎机粗碎,对辊破碎机细碎,然后振动筛分级,最后采用磁选除铁,磁场强度为60-150KA/m。
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