膨润土预处理对球团成球和焙烧性能影响的研究
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摘要
随着钢铁工业的不断发展,高炉迫切需要合理的含铁原料,高碱度烧结矿搭配酸性球团矿已成为国内一种较理想的高炉含铁原料组成形式。目前,我国许多钢铁企业纷纷生产氧化球团矿来优化高炉炉料结构。但由于国内造球原料——铁精矿成球性能普遍较差,许多球团厂以提高膨润土的配比来解决此问题,这不但造成球团生产的成本高,还对后序工艺——炼铁,非常不利。
本文通过对膨润土进行磨矿处理,降低膨润土粒度,使其物化特性发生改变,从而提高球团性能指标,在降低膨润土用量的同时提高成品球团矿的铁品位。
经过90min磨矿预处理后,膨润土中-0.074mm的粒级由87.80%提高到97.92%,其中-0.040mm由11.79%提高到48.75%。
保安钙基膨润土配加钠化剂Na_2CO_3,采用干混法进行钠化改性,改性效果明显,膨润土物化性能指标得到较大的提高,当Na_2CO_3配比为2.0%,钠化时间为10min时,膨润土吸蓝量为98.9mmol/100g,膨胀容为13.2ml/g,胶质价为103ml/15g。
本试验的最终结果表明,将钙基膨润土经磨矿预处理,可改变膨润土的粒度组成,提高膨润土物化性能,从而减少膨润土配比;而钠化改性则可改善钙基膨润土的物化性能,提高膨润土的质量,使球团成球和焙烧性能得到很大的改善,同时可相对抑制因膨润土配比过大引起的球团铁品位降低,减少有害杂质入炉,为高炉节焦增铁创效提供有利条件。
With the continuous development of iron and steel industry, a reasonable iron-bearing raw material is urgent needed in blast furnace, and high basicity sinter adding acid pellet is becoming an ideal blast furnace burden structure. Nowadays, many iron and steel enterprises produce oxide pellets to optimize blast furnace burden structure in our country. However, due to the pelletizingproperty of domestic pellet raw material--concentrate is low, many pellet enterprises solutethis problem through adding high percentage proportion of bentonite. It not only creates high cost of pellet production, but also has an unfavorable effect to later process--iron-making.
In this paper, grinding treatment has been given to bentonite and the size of bentonite has been reduced, which has changed the physical and chemical properties of bentonite and improved performance index of bentonite. Reduced the amount of bentonite improve the iron content of pellets.
After 90 minutes repeatedly grinding, the size of bentonite has been improved from A_0 contains 87.80% content of-0.074 mm and 11.79% content of-0.040 mm in original ore to A_5 contains 97.92% content of-0.074 mm and 48.75% content of-0.040mm.
Calcium bentonite of Baoan added Na_2CO_3 and sodium modified by using dry mixing technology, the effect of sodium chloride modified was obvious, and the physical and chemical properties index of bentonite had been improved greatly. The percentage proportion of Na_2CO_3 was 2%, the time of sodium chloride modified was 10 minutes. The absorptivity of methylene blue was 98.9mmol/100g, the expansion capacity of bentonite was 13.2 ml/g and the colloid index of bentonite was 103ml/15g.
The final result of this experiment indicated that calcium bentonite, which was coped with repeatedly grinding process, can reduce the size and improve the physical and chemical properties of bentonite, thus it can reduce the percentage proportion of bentonite. Sodium chloride modified bentonite can improve the physical and chemical properties of bentonite and enhance the main parameter index, which will greatly improve the properties of pelletizing and roasting. At the same time, it can inhibit reducing of pellet iron content and decrease harmful impurity coming into blast furnace, which causes by adding excessive bentonite. This has explored a new way of saving coke, increasing iron content and increasing economic benefits for blast furnace.
本文通过对膨润土进行磨矿处理,降低膨润土粒度,使其物化特性发生改变,从而提高球团性能指标,在降低膨润土用量的同时提高成品球团矿的铁品位。
经过90min磨矿预处理后,膨润土中-0.074mm的粒级由87.80%提高到97.92%,其中-0.040mm由11.79%提高到48.75%。
保安钙基膨润土配加钠化剂Na_2CO_3,采用干混法进行钠化改性,改性效果明显,膨润土物化性能指标得到较大的提高,当Na_2CO_3配比为2.0%,钠化时间为10min时,膨润土吸蓝量为98.9mmol/100g,膨胀容为13.2ml/g,胶质价为103ml/15g。
本试验的最终结果表明,将钙基膨润土经磨矿预处理,可改变膨润土的粒度组成,提高膨润土物化性能,从而减少膨润土配比;而钠化改性则可改善钙基膨润土的物化性能,提高膨润土的质量,使球团成球和焙烧性能得到很大的改善,同时可相对抑制因膨润土配比过大引起的球团铁品位降低,减少有害杂质入炉,为高炉节焦增铁创效提供有利条件。
With the continuous development of iron and steel industry, a reasonable iron-bearing raw material is urgent needed in blast furnace, and high basicity sinter adding acid pellet is becoming an ideal blast furnace burden structure. Nowadays, many iron and steel enterprises produce oxide pellets to optimize blast furnace burden structure in our country. However, due to the pelletizingproperty of domestic pellet raw material--concentrate is low, many pellet enterprises solutethis problem through adding high percentage proportion of bentonite. It not only creates high cost of pellet production, but also has an unfavorable effect to later process--iron-making.
In this paper, grinding treatment has been given to bentonite and the size of bentonite has been reduced, which has changed the physical and chemical properties of bentonite and improved performance index of bentonite. Reduced the amount of bentonite improve the iron content of pellets.
After 90 minutes repeatedly grinding, the size of bentonite has been improved from A_0 contains 87.80% content of-0.074 mm and 11.79% content of-0.040 mm in original ore to A_5 contains 97.92% content of-0.074 mm and 48.75% content of-0.040mm.
Calcium bentonite of Baoan added Na_2CO_3 and sodium modified by using dry mixing technology, the effect of sodium chloride modified was obvious, and the physical and chemical properties index of bentonite had been improved greatly. The percentage proportion of Na_2CO_3 was 2%, the time of sodium chloride modified was 10 minutes. The absorptivity of methylene blue was 98.9mmol/100g, the expansion capacity of bentonite was 13.2 ml/g and the colloid index of bentonite was 103ml/15g.
The final result of this experiment indicated that calcium bentonite, which was coped with repeatedly grinding process, can reduce the size and improve the physical and chemical properties of bentonite, thus it can reduce the percentage proportion of bentonite. Sodium chloride modified bentonite can improve the physical and chemical properties of bentonite and enhance the main parameter index, which will greatly improve the properties of pelletizing and roasting. At the same time, it can inhibit reducing of pellet iron content and decrease harmful impurity coming into blast furnace, which causes by adding excessive bentonite. This has explored a new way of saving coke, increasing iron content and increasing economic benefits for blast furnace.
引文
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[3]由文全.实用高炉炼铁技术[M].北京:冶金工业出版社,2002.
[4]张一敏.球团理论与工艺[M].北京:冶金工业出版社,1997.
[5]叶匡吾.关于球团厂建设的几点意见[J].烧结球团,2001,3(1):1-2.
[6]彭志坚.团矿添加剂[M].内部资料.
[7]董元锋.膨润土的有机改性及其应用[J].造纸化学品,2006,18(增刊):15-18.
[8]秦英伟,刘鹏君.润磨提高球团矿质量实践[A].2007年钢铁年会论文集[C],长沙:国防科技大学出版社,2007.19-24.
[9]曹立刚,王洪波,王杰.复合粘结剂在包钢球团中的应用[J].烧结球团,2007,2(4):49-52.
[10]潘嘉芬.钙基膨润土的钠化改性及其印染废水处理[J].矿产综合利用,2005,4(3):3-5.
[11]赵文涛.低品位钙基膨润土的提纯与钠化改性研究[J].淮北煤炭师范学院学报,2005,4(22):48-51.
[12]张玉柱,边妙莲,刘鹏君等.膨润土理化性能对球团性能影响的研究[J].烧结球团,2006,3(2):21-24.
[13]张太亮,黄志红,莫军等.膨润土改性作用机理及改性方法研究[J].钻采工艺,2006,2(6):102-103.
[14]Shen YunHwei.Preparation of organobentonite using nonionic surfactant[J].Chemosphere,2001,4(10):989-995.
[15]Christopher Breen,Ruth Waston.Acid-activated organochays:preparation,characterization and catalytic activity ofpolycation-treated bentonites[J].Applied Clay,1998,(2):479-494.
[16]Grim R E and Giiven N.Bentonite:Geology,Mineralogy,Propertites and Usage[J].Development in Sedimentary,Elsever.Scientific Publication,1997,3(4):13-16.
[17]S.Komar Kawatra,S.jay son Ripke.Laboratory studies for improving green ball strengtb in bentonite-bonded magnetite concentrate pellets[J].Mineral Processing.2003,(11):429-441.
[18]易发成,戴淑霞,侯兰杰等.钙基膨润土钠化改型工艺及其产品应用现状[J].中国矿业,1997,(6):65-68.
[19]姚道坤,史素端编著.中国膨润土矿床及其开发应用[M].北京:地质出版社,1994.
[20]Li Liangxiong,Dong Junhang,Lee Robert.Preparation of a alumina supported mesoporous bentonite membranes for reverse osmosis desalination of aqueous solutions[J].Journal of Colloid and Interface Science,2004,(12):540-546.
[21]David Christion Rodriguez-Sarmiento,Jorge Alejo Pinzon-Bello.Adsorption of sodium dodecy benzene sulfonate on organophilic bentonites[J].Applied Clay Science,2001,(11):173-181.
[22]Moronta A,Ferrer V,Quero Jet al.Influence of preparation method on the catalytic properties of acid-activated tetram ethylam monium-exchanged clays[J].Appl Catal A Gen,2002,(12):127-135.
[23]张秀英.膨润土钠化技术研究[J].非金属矿,2005,(10):34-35.
[24]杨有学.我国膨润土及其应用[J].无机盐工业,1996,(3):40-44.
[25]张永华,王淑萍,乔世德等.有机膨润土的制备研究[J].非金属矿,1996,(2):15-17.
[26]栾文楼,李明路.膨润土的开发应用[M].北京:地质工业出版社,1998.
[27]李建平.膨润土的工艺特性及其应用[J].地质找矿论丛,1998,3(1):12-16.
[28]任磊夫.粘土矿物与粘土岩[M].北京:地质工业出版社,1999.
[29]张培元.中国工业矿物和岩石(下册).北京:地质工业出版社,1998.
[30]黎文辉.膨润土中蒙脱石类质同象置换研究的样品处理探讨[J].非金属矿,1995,(2):1-5.
[31]莱方德.工业矿物和岩石(第四版).北京:中国建筑出版社,1997.
[32]叶匡吾.关于球团厂建设的几点意见[J].烧结球团,2001,3(1):1-2.
[33]Klinefelter T.A..Evalution of some binders for use in pelletising slimes[J].U.S.Bur.Mine,1999,3(2):38-46.
[34]Roorda H.J.,Burghardt O.,Kortmann H.A.,Kater T.Production of fluxed iron ore pellets for direction reduction using organic binder[J],symposium on Agglomeration,Nuernberg,2002,(5):152-164.
[35]de Souza R P,de Mendonca C F.,Kater T.Production of acid iron ore pellets for direct reduction using an organic binder[J].Mining Engineering,1997,(8):147-151.
[36]Roorda H.J.,Burghardt O.,Kortmann H.A.,Jipping M.J.,Kater T..Organic binders for iron ore agglomeration[J].Ⅺ IMPC,Cagliari,Italy:2001,1(4):109-112.
[37]Murr D.L.,Englund D.J..Development and production of organic-limestone pellets[J].48th Ironmaking Conf.,1995,16(4):715-732.
[38]朱德庆,张汉泉.铁精矿冷固结球团回转窑煤基直接还原新工艺[J],钢铁研究,2003,(1):15-18.
[39]Nikolas K.E.L.,New methods of application of polyacrylate resins as binder[J].Materials Chemistry and Physics,2002,3(12):169-172.
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