D0L:10.13374折.issn1001-053x.2012.12.011 第34卷第12期 北京科技大学学。报 Vol.34 No.12 2012年12月 Journal of University of Science and Technology Beijing Dec.2012 利用铁尾矿高温改性钢渣的性能 张作顺”连 芳)回廖洪强)杨淇) 曹文斌” 1)北京科技大学材料科学与工程学院,北京1000832)首钢总公司能源环保产业事业部,北京100041 ☒通信作者,E-mail:lianfang(@master.usth.edu.cn 摘要研究了铁尾矿高温改性处理对钢渣体积稳定性和胶凝性能的影响,结合X射线衍射分析、扫描电镜观察和能谱分析 等测试方法,对改性钢渣的矿物组成和微观形貌进行了分析.发现铁尾矿的高温改性显著降低了钢渣中游离氧化钙(CO) 的含量,提高了钢渣胶凝性能.铁尾矿摻加质量分数为20%和处理温度为1250℃时,钢渣中f-C0的质量分数由4.84%降低 至1.82%,降幅达到62.4%,28d活性指数比原始钢渣体系提高5.6%.铁尾矿掺量由10%增加至30%时,改性钢渣中相继出 现镁蔷薇辉石、镁黄长石和钙镁辉石等硅酸盐矿相.高温改性过程促使R0相分解,R0相中的F0转化为磁铁矿相(FO,). 关键词钢渣水泥:尾矿:改性:胶凝性能 分类号T0172.9 Modifying the properties of steel slag by iron tailings at high temperature ZHANG Zuo-shun,LIAN Fang,LIAO Hong-qiang?,YANG Qi,CAO Wen-bin 1)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Energy and Environment Protection Industry Department,Shougang Group,Beijing 100041,China Corresponding author,E-mail:lianfang@master.ustb.edu.cn ABSTRACT High-temperature modification by iron tailings was performed to study its influence on the volume stability and cementi- tious properties of steel slag.The mineral constituents and microstructure of steel slag after the high-temperature modification were ana- lyzed via X-ray diffraction (XRD),scanning electronic microscopy (SEM)and energy dispersive spectrometry (EDS).It is found that the content of f-Ca0 obviously decreases and the cementitious properties of steel slag improve through the high-temperature modifica- tion.Compared with raw steel slag,the mass fraction of f-Cao in steel slag decreases from 4.84%to 1.82%after modification with 20%iron tailings at 1250C and the activity index increases up to 5.6%after 28d.With an increase in the mass fraction of iron tail- ings from 10%to 30%,silicate mineral phases such as manganolite,akermanite and calcium magnesium pyroxene form in the modified steel slag.The high-temperature modification promotes the decomposition of RO phase,in which Fe0 transforms to magnetite (Fe:0) simultaneously. KEY WORDS slag cement:tailings:modification:cementitious properties 钢渣是炼钢过程中产生的废弃物,排出量约占 筑材料资源进行开发使用B, 粗钢产量的15%~20%,2011年我国粗钢产量达 研究表明,钢渣作为矿物掺合料应用于水 6.96亿t,钢渣排放量达1.05亿t0.钢渣中含有丰 泥混凝土领域是实现钢渣资源化利用的重要途 富的资源,首先炼钢终期排放的钢渣热含量较高,1 径:但钢渣在水泥混凝土领域中的利用率较低,主 kg(1600℃)钢渣的热量达2000kJ回,这些热量随 要与钢渣体积稳定性不良、胶凝活性低等有关.钢 着钢渣的冷却而逐渐散失,未得到充分利用.其次, 渣中含有5%~10%的游离氧化钙(f-Ca0),其形 钢渣的化学成分和矿物组成与水泥熟料相似,含有 成温度高,结晶完好,且固溶了部分杂质元素,因 硅酸二钙(C,S)和硅酸三钙(C,S)等矿物,可作为建 此完全水化时间漫长,f-Ca0与水反应时体积膨胀 收稿日期:2012-12-28 基金项目:国家科技支撑计划资助项目(2011BAB03B05)第 34 卷 第 12 期 2012 年 12 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol. 34 No. 12 Dec. 2012 利用铁尾矿高温改性钢渣的性能 张作顺1) 连 芳1) 廖洪强2) 杨 淇1) 曹文斌1) 1) 北京科技大学材料科学与工程学院,北京 100083 2) 首钢总公司能源环保产业事业部,北京 100041 通信作者,E-mail: lianfang@ master. ustb. edu. cn 摘 要 研究了铁尾矿高温改性处理对钢渣体积稳定性和胶凝性能的影响,结合 X 射线衍射分析、扫描电镜观察和能谱分析 等测试方法,对改性钢渣的矿物组成和微观形貌进行了分析. 发现铁尾矿的高温改性显著降低了钢渣中游离氧化钙( f--CaO) 的含量,提高了钢渣胶凝性能. 铁尾矿掺加质量分数为 20% 和处理温度为 1250 ℃时,钢渣中 f--CaO 的质量分数由 4. 84% 降低 至 1. 82% ,降幅达到 62. 4% ,28 d 活性指数比原始钢渣体系提高 5. 6% . 铁尾矿掺量由 10% 增加至 30% 时,改性钢渣中相继出 现镁蔷薇辉石、镁黄长石和钙镁辉石等硅酸盐矿相. 高温改性过程促使 RO 相分解,RO 相中的 FeO 转化为磁铁矿相( Fe3O4 ) . 关键词 钢渣水泥; 尾矿; 改性; 胶凝性能 分类号 TQ172. 9 Modifying the properties of steel slag by iron tailings at high temperature ZHANG Zuo-shun1) ,LIAN Fang1) ,LIAO Hong-qiang2) ,YANG Qi 1) ,CAO Wen-bin1) 1) School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2) Energy and Environment Protection Industry Department,Shougang Group,Beijing 100041,China Corresponding author,E-mail: lianfang@ master. ustb. edu. cn ABSTRACT High-temperature modification by iron tailings was performed to study its influence on the volume stability and cementitious properties of steel slag. The mineral constituents and microstructure of steel slag after the high-temperature modification were analyzed via X-ray diffraction ( XRD) ,scanning electronic microscopy ( SEM) and energy dispersive spectrometry ( EDS) . It is found that the content of f-CaO obviously decreases and the cementitious properties of steel slag improve through the high-temperature modification. Compared with raw steel slag,the mass fraction of f-CaO in steel slag decreases from 4. 84% to 1. 82% after modification with 20% iron tailings at 1 250 ℃ and the activity index increases up to 5. 6% after 28 d. With an increase in the mass fraction of iron tailings from 10% to 30% ,silicate mineral phases such as manganolite,akermanite and calcium magnesium pyroxene form in the modified steel slag. The high-temperature modification promotes the decomposition of RO phase,in which FeO transforms to magnetite ( Fe3O4 ) simultaneously. KEY WORDS slag cement; tailings; modification; cementitious properties 收稿日期: 2012--12--28 基金项目: 国家科技支撑计划资助项目( 2011BAB03B05) 钢渣是炼钢过程中产生的废弃物,排出量约占 粗钢产量的 15% ~ 20% ,2011 年我国粗钢产量达 6. 96 亿 t,钢渣排放量达 1. 05 亿 t [1]. 钢渣中含有丰 富的资源,首先炼钢终期排放的钢渣热含量较高,1 kg( 1 600 ℃ ) 钢渣的热量达 2 000 kJ [2],这些热量随 着钢渣的冷却而逐渐散失,未得到充分利用. 其次, 钢渣的化学成分和矿物组成与水泥熟料相似,含有 硅酸二钙( C2 S) 和硅酸三钙( C3 S) 等矿物,可作为建 筑材料资源进行开发使用[3--6]. 研究表明[7--8],钢渣作为矿物掺合料应用于水 泥混凝土领域是实现钢渣资源化利用的重要途 径; 但钢渣在水泥混凝土领域中的利用率较低,主 要与钢渣体积稳定性不良、胶凝活性低等有关. 钢 渣中含有 5% ~ 10% 的游离氧化钙( f--CaO) ,其形 成温度高,结晶完好,且固溶了部分杂质元素,因 此完全水化时间漫长,f--CaO 与水反应时体积膨胀 DOI:10.13374/j.issn1001-053x.2012.12.011