工程科学学报，第38卷，第10期：1369-1376,2016年10月 Chinese Journal of Engineering,Vol.38,No.10:1369-1376,October 2016 D0l:10.13374/j.issn2095-9389.2016.10.004;http:/journals.ustb.edu.cn 铬铁矿球团焙烧固结特性 甘 敏，高露，范晓慧四，陈许玲，田志远，周训伟 中南大学资源加工与生物工程学院，长沙410083 ☒通信作者，E-mail:csufanxiaohui@126.com 摘要本文系统研究铬铁矿球团的焙烧固结特性.结果表明：预热时间对于预热球强度影响不大，在预热时间为10m 时，随着预热温度的提高，预热球强度和氧化率呈直线型增加，适宜温度为1050℃，此时预热球强度可达每个400N以上：与 传统铁矿球团相比，铬铁矿球团焙烧所需的温度高，焙烧时间为10min时，焙烧温度从1250℃提高到1350℃，球团强度从每 个1078N提高到1973N.在铬铁矿球团预热和焙烧过程中，铬尖晶石(Fe,Mg)(Cr,Fe,A),0,氧化生成富镁的(Fe,Mg)(Cr, Fe,A),04和铬铁铝复合氧化物(Cr,Fe,A),0,当温度高于1000℃时，(Cr,Fe,A),03新相生成，其主要以环状分布在颗粒 外层，颗粒内部为针状与(Fe,Mg)(Cr,Fe,Al),O,形成交织结构，降低Cr/Fe比或升高焙烧温度均有助于(Cr,Fe,Al),O,向 颗粒外层富集和再结晶长大，有利于球团的固结，提高球团强度 关键词铬铁矿：球团：焙烧：氧化：固结 分类号TF046 Oxidation consolidation characteristics of chromite pellets during the roasting process GAN Min,GAO Lu,FAN Xiao-hui,CHEN Xu-ing,TIAN Zhi-yuan,ZHOU Xun-ei School of Minerals Processing Bioengineering,Central South University,Changsha 410083,China Corresponding author,E-mail:csufanxiaohui@126.com ABSTRACT The roasting consolidation characteristics of chromite pellets were systematically studied in this paper.The results show that preheating time has little effect on the compressive strength of preheating chromite pellets.Under the appropriate preheating time of 10 min,increasing the preheating temperature can improve the compressive strength and oxidation rate of preheating chromite pellets linearly.The appropriate preheating temperature is 1050C,at which the compressive strength of preheating chromite pellets can reach more than 400 N.In addition,compared with conventional iron ore pellets,a higher roasting temperature is required for chromite pel- lets.The compressive strength of chromite pellets increases from 1078 N to 1973 N when the roasting temperature increases from 1250 C to 1350C.During the preheating and roasting of chromite pellets,(Fe,Mg)(Cr,Fe,Al)20 is oxidized into (Fe,Mg)(Cr,Fe, Al)2 and (Cr,Fe,Al)2 The new phase (Cr,Fe,Al)2 is obviously generated when the temperature surpasses 1000 C.(Cr, Fe,Al)2O mainly distributes in the outer layer of the particles in a ring shape,while the acicular (Cr,Fe,Al)2O interlaces together with (Fe,Mg)(Cr,Fe,Al)20 in the internal part.Decreasing the Cr/Fe ratio in the raw ore concentrate or increasing the roasting temperature can facilitate the aggregation of (Cr,Fe,Al)O around the outer layer of the particles,which in terms assists in the pellet consolidation and then enhances the compressive strength of chromite pellets. KEY WORDS chromite;ore pellets;roasting:oxidation:consolidation 铬铁合金冶炼的主要原料包括铬铁块矿和铬铁粉矿(<8mm),由于在治炼过程中对炉料透气性的要 收稿日期：2015-1203 基金项目：国家自然科学基金资助项目(51474237)：中国博士后科学基金资助项目(2014T70691):湖南省战略金属矿产资源清洁高效利用协 同创新中心资助项目：中南大学“创新驱动计划”资助项目(2015CX005)工程科学学报，第 38 卷，第 10 期: 1369--1376，2016 年 10 月 Chinese Journal of Engineering，Vol． 38，No． 10: 1369--1376，October 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 10． 004; http: / /journals． ustb． edu． cn 铬铁矿球团焙烧固结特性 甘 敏，高 露，范晓慧，陈许玲，田志远，周训伟 中南大学资源加工与生物工程学院，长沙 410083  通信作者，E-mail: csufanxiaohui@ 126． com 摘 要 本文系统研究铬铁矿球团的焙烧固结特性． 结果表明: 预热时间对于预热球强度影响不大，在预热时间为 10 min 时，随着预热温度的提高，预热球强度和氧化率呈直线型增加，适宜温度为 1050 ℃，此时预热球强度可达每个 400 N 以上; 与 传统铁矿球团相比，铬铁矿球团焙烧所需的温度高，焙烧时间为 10 min 时，焙烧温度从 1250 ℃ 提高到 1350 ℃，球团强度从每 个 1078 N 提高到 1973 N． 在铬铁矿球团预热和焙烧过程中，铬尖晶石( Fe，Mg) ( Cr，Fe，Al) 2O4 氧化生成富镁的( Fe，Mg) ( Cr， Fe，Al) 2O4 和铬铁铝复合氧化物( Cr，Fe，Al) 2O3，当温度高于 1000 ℃时，( Cr，Fe，Al) 2O3 新相生成，其主要以环状分布在颗粒 外层，颗粒内部为针状与( Fe，Mg) ( Cr，Fe，Al) 2O4 形成交织结构，降低 Cr /Fe 比或升高焙烧温度均有助于( Cr，Fe，Al) 2O3 向 颗粒外层富集和再结晶长大，有利于球团的固结，提高球团强度． 关键词 铬铁矿; 球团; 焙烧; 氧化; 固结 分类号 TF046 Oxidation consolidation characteristics of chromite pellets during the roasting process GAN Min，GAO Lu，FAN Xiao-hui ，CHEN Xu-ling，TIAN Zhi-yuan，ZHOU Xun-wei School of Minerals Processing ＆ Bioengineering，Central South University，Changsha 410083，China  Corresponding author，E-mail: csufanxiaohui@ 126． com ABSTＲACT The roasting consolidation characteristics of chromite pellets were systematically studied in this paper． The results show that preheating time has little effect on the compressive strength of preheating chromite pellets． Under the appropriate preheating time of 10 min，increasing the preheating temperature can improve the compressive strength and oxidation rate of preheating chromite pellets linearly． The appropriate preheating temperature is 1050 ℃，at which the compressive strength of preheating chromite pellets can reach more than 400 N． In addition，compared with conventional iron ore pellets，a higher roasting temperature is required for chromite pel￾lets． The compressive strength of chromite pellets increases from 1078 N to 1973 N when the roasting temperature increases from 1250 ℃ to 1350 ℃ ． During the preheating and roasting of chromite pellets，( Fe，Mg) ( Cr，Fe，Al) 2O4 is oxidized into ( Fe，Mg) ( Cr，Fe， Al) 2O4 and ( Cr，Fe，Al) 2O3 ． The new phase ( Cr，Fe，Al) 2O3 is obviously generated when the temperature surpasses 1000 ℃ ． ( Cr， Fe，Al) 2O3 mainly distributes in the outer layer of the particles in a ring shape，while the acicular ( Cr，Fe，Al) 2O3 interlaces together with ( Fe，Mg) ( Cr，Fe，Al) 2O4 in the internal part． Decreasing the Cr /Fe ratio in the raw ore concentrate or increasing the roasting temperature can facilitate the aggregation of ( Cr，Fe，Al) 2O3 around the outer layer of the particles，which in terms assists in the pellet consolidation and then enhances the compressive strength of chromite pellets． KEY WOＲDS chromite; ore pellets; roasting; oxidation; consolidation 收稿日期: 2015--12--03 基金项目: 国家自然科学基金资助项目( 51474237) ; 中国博士后科学基金资助项目( 2014T70691) ; 湖南省战略金属矿产资源清洁高效利用协 同创新中心资助项目; 中南大学“创新驱动计划”资助项目( 2015CX005) 铬铁合金冶炼的主要原料包括铬铁块矿和铬铁粉 矿( ＜ 8 mm) ，由于在冶炼过程中对炉料透气性的要