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D01:10.133741.ism100103x.2009.0L.003 第31卷第1期 北京科技大学学报 Vol.31 No.I 2009年1月 Journal of University of Science and Technology Beijing Jan.2009 高压辊磨预处理强化巴西镜铁矿球团 朱德庆)唐艳云)Vinicius Mendes2)潘 建)翟 勇) )中南大学资源加工与生物工程学院,长沙4100832)巴西Ve巴西 摘要采用高压辊磨技术预处理镜铁矿,对强化其球团工艺及机理进行了研究.扫描电镜观测证实,通过优化高压辊磨闭 路流程的循环负荷.巴西镜铁矿的表面形状及比表面积得到改善.成球性得到明显提高.以70%镜铁矿配加30%磁铁矿为原 料,采用71%高压辊磨产品返回方式处理后,在添加2.4%的膨润土、造球时间15mi及造球水分8%的条件下,生球各指标 与同配比未经高压辊磨处理的相比均有大幅度提高,其05m落下强度达到45次,单球抗压强度1025N,爆裂温度455℃; 生球在预热温度1050℃预热时间10min,焙烧温度1280℃.焙烧时间12min的条件下焙烧,成品球单球抗压强度达到 2690.88N,满足球团生产的要求. 关键词高压辊磨:镜铁矿:磁铁矿;球团 分类号TF046.6 Improvement in pelletization of Brazilian specularite by high-pressure roller grinding ZHU De-qing.TANG Yan-yun,Vinicius Mendes,PAN Jian.ZHAI Yong 1)School of Mineral Processing and Bioengineering.Central South University.Changsha 410083.China 2)Brazil Vak,Brazil ABSTRACT The processing and mechanism of the improvement in pelletization of Brazilian specularite by high-pressure roller grind- ing(HPRG)were investigated.SEM observations show that after being pretreated by HPRG in a closed flow path at an optimized cyclic loading,the specific surface area of Brazilian specularite increases greatly and its ballability is dramatically improved.The pellet feed composed of 70%specularite and 30%magnetite was pretreated by HPRG at 71%-product cyclic loading in a closed flow path. mixed w ith 2.4%bentonite and balled for 15 min under the 8%moisture.Experimental results show that allindexes of green pellets are much higher than those of the pellets made of the same feed without the pretreating.The drop number is up to 4.5 times from the 0.5m height.the compression strength is 10.25 N per pellet.and the thermal shock temperature is 455 C.The compression strength of fired pellets was tested up to 2690 88N per pellet by preheating at 1050 C for 10min and by roasting at 1280C for 12 min,which meets the demand of strength for commercial pellets. KEY WORDS high-pressure roller grinding:specularite:magnetite:pellets 我国钢铁工业快速发展,自1996年已成为世 迫在眉睫,巴西镜铁矿虽然成球性和可烧性差.但 界上第一大钢产国,对进口矿的依赖度由1993年的 其铁矿品位高,硅、铝及磷等杂质元素含量低,储量 6%上升到2006年的55%以上刂.资源的短缺迫使 丰富,如能找到合适方法对其加以利用,对我国钢铁 我国大中型钢铁企业从国外进口的铁矿量不断增 企业的发展将具有十分重要的意义,本文利用高压 加.尤其是近年来链算机一回转窑球团方法的迅速 辊磨新技术对巴西高品位镜铁矿进行预处理,通过 发展与大型化,以致铁品位高、粒度细和焙烧性能好 配加磁铁矿及高压辊磨闭路流程,使巴西高品位镜 的磁铁精矿日益紧缺,球团原料不足有可能成为我 铁矿在球团生产中高比例配加(巴西镜铁矿的配矿 国钢铁工业持续发展的瓶颈,开发新的铁矿资源己 比例高达70%),为其在球团生产中的广泛应用提 收稿日期:2007-12-29 作者简介:朱德庆(1964一),男,教授,博士,博士生导师,E-maik dgzhu@mail.cst.edm.cem高压辊磨预处理强化巴西镜铁矿球团 朱德庆1) 唐艳云1) Vinicius Mendes 2) 潘 建1) 翟 勇1) 1) 中南大学资源加工与生物工程学院, 长沙 410083 2) 巴西 Vale, 巴西 摘 要 采用高压辊磨技术预处理镜铁矿, 对强化其球团工艺及机理进行了研究.扫描电镜观测证实, 通过优化高压辊磨闭 路流程的循环负荷, 巴西镜铁矿的表面形状及比表面积得到改善, 成球性得到明显提高.以 70 %镜铁矿配加 30 %磁铁矿为原 料, 采用 71%高压辊磨产品返回方式处理后, 在添加 2.4 %的膨润土、造球时间 15 min 及造球水分 8%的条件下, 生球各指标 与同配比未经高压辊磨处理的相比均有大幅度提高, 其 0.5 m 落下强度达到 4.5 次, 单球抗压强度 10.25 N, 爆裂温度 455 ℃; 生球在预热温度 1 050 ℃、预热时间 10 min, 焙烧温度 1 280 ℃、焙烧时间 12 min 的条件下焙烧, 成品球单球抗压强度达到 2 690.88 N, 满足球团生产的要求. 关键词 高压辊磨;镜铁矿;磁铁矿;球团 分类号 TF046.6 Improvement in pelletization of Brazilian specularite by high-pressure roller grinding ZHU De-qing 1) , TANG Yan-yun 1) , Vinicius Mendes 2) , PAN J ian 1) , ZHAI Yong 1) 1) School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China 2) Brazil Vale, Brazil ABSTRACT The processing and mechanism of the improvement in pelletization of Brazilian specularite by high-pressure roller g rind￾ing ( HPRG) w ere investig ated .SEM observations show that after being pretreated by HPRG in a closed flow path at an optimized cyclic loading , the specific surface area of Brazilian specularite increases greatly and its ballability is dramatically improved.The pellet feed composed of 70 %specularite and 30 % mag netite was pretreated by HPRG at 71 %-product cyclic loading in a closed flow path, mixed w ith 2.4 %bentonite and balled for 15 min under the 8 %moisture.Experimental results show that all indexes of green pellets are much higher than those of the pelle ts made of the same feed without the pretreating .The drop number is up to 4.5 times from the 0.5 m heig ht, the compression streng th is 10.25 N per pellet, and the thermal shock temperature is 455 ℃.The compression streng th of fired pellets was tested up to 2690.88 N per pellet by preheating at 1 050 ℃for 10min and by roasting at 1280 ℃ for 12 min, which meets the demand of streng th for commercial pellets . KEY WORDS high-pressure roller grinding;specularite;mag netite;pellets 收稿日期:2007-12-29 作者简介:朱德庆( 1964—) , 男, 教授, 博士, 博士生导师, E-mail:dqzhu@mail.csu.edu.cn 我国钢铁工业快速发展, 自 1996 年已成为世 界上第一大钢产国, 对进口矿的依赖度由 1993 年的 6 %上升到 2006 年的 55 %以上[ 1] .资源的短缺迫使 我国大中型钢铁企业从国外进口的铁矿量不断增 加.尤其是近年来链箅机-回转窑球团方法的迅速 发展与大型化, 以致铁品位高 、粒度细和焙烧性能好 的磁铁精矿日益紧缺, 球团原料不足有可能成为我 国钢铁工业持续发展的瓶颈, 开发新的铁矿资源已 迫在眉睫 .巴西镜铁矿虽然成球性和可烧性差, 但 其铁矿品位高, 硅 、铝及磷等杂质元素含量低, 储量 丰富, 如能找到合适方法对其加以利用, 对我国钢铁 企业的发展将具有十分重要的意义 .本文利用高压 辊磨新技术对巴西高品位镜铁矿进行预处理, 通过 配加磁铁矿及高压辊磨闭路流程, 使巴西高品位镜 铁矿在球团生产中高比例配加( 巴西镜铁矿的配矿 比例高达 70 %) , 为其在球团生产中的广泛应用提 第 31 卷 第 1 期 2009 年 1 月 北 京 科 技 大 学 学 报 Journal of University of Science and Technology Beijing Vol .31 No.1 Jan.2009 DOI :10.13374/j .issn1001 -053x.2009.01.003
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