分流制粒协同燃料分加强化红土镍矿烧结试验  

Experiment on strengthening sintering performance of laterite nickel ore by separated granulating and separate fuel adding

作　　者：胡梦杰 陈铁军[1,2] 潘料庭 周仙霖[1,2] 黄学忠 刘佳文 HU Meng-jie;CHEN Tie-jun;PAN Liao-ting;ZHOU Xian-lin;HUANG Xue-zhong;LIU Jia-wen(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Key Laboratory of Efficient Utilization and Agglomeration of Metallurgical Mineral Resources,W uhan 430081,Hubei,China;Technology Research Institute,Guangxi Beigang New MaterialCo.,Ltd.,Beihai 536000,Guangxi,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081 [3]广西北港新材料有限公司技术研究院,广西北海536000

出　　处：《钢铁》2022年第6期12-21,共10页Iron and Steel

基　　金：湖北省教育厅科学研究计划资助项目(Q20191110)。

摘　　要：在红土镍矿烧结生产中,为了实现资源综合利用,配料过程常常会加入烧结除尘灰、高炉重力灰、细粒返矿等物料;然而,该部分物料由于制粒性差,易对料层透气性和烧结性能产生不良影响。为了改善料层透气性,同时达到提高烧结性能的目的,对烧结除尘灰、高炉重力灰及细粒返矿等物料进行了分流制粒。另外,为防止制粒小球发生欠烧,对分流制粒物料进行了燃料分加。通过烧结杯试验,研究了分流制粒协同燃料分加对料层透气性及烧结性能的影响。通过X射线衍射和金相显微镜对烧结矿进行了工艺矿物学分析,揭示了强化红土镍矿烧结性能的相关机理。结果表明,与基准相比,分流制粒协同燃料分加30%时,混合料的平均粒度由4.18 mm提高到5.99 mm,料层透气性指数由0.233提高到0.482;同时,烧结性能大幅提高,烧结成品率由68.69%提高到79.37%,转鼓强度由51.73%提高到60.82%,垂直烧结速度由24.44 mm/min提高到33.48 mm/min,利用系数由0.77 t/(m^(2)·h)提高到0.99 t/(m^(2)·h),固体燃耗由147.10 kg/t下降到130.29 kg/t。工艺矿物学表明,与基准期相比,分流制粒烧结矿的孔洞和裂纹大量减少,微观结构更加致密;同时,烧结矿主要固相铁尖晶石与液相之间润湿程度提高,针状和交织状SFCA增多,因此烧结矿固结条件大幅改善。In the sintering production of laterite nickel ore,in order to realize the comprehensive utilization of resources,sintering dust,blast furnace gravity ash,fine particle return mine and other materials are often added in the batching process.However,these materials are easy to have adverse effects on the permeability and sintering performance of the layer due to poor granulating.In order to improve the permeability of the layer and sintering performance,the sintering dust,gravity ash of blast furnace and fine particle return mine were separated granulated.In addition,in order to prevent the pellets from underburning,the fuel was added separately to the separated granulating materials.The effects of separated granulating and separate fuel adding on the permeability of layer and sintering performance were studied by sinter pot experiment.The process mineralogy of sinter was analyzed by X-ray diffraction and metallographic microscope,and the related mechanism for strengthening sintering of laterite nickel ore was revealed.The results show that,compared with the reference,when 30%of anthracite is added into separated granulating,the average particle size of mixture increases from 4.18 mm to 5.99 mm,and the layer permeability index increases from 0.233 to 0.482.At the same time,the sintering performance is greatly improved,the sintering yield increases from 68.69%to 79.37%,the tumbler index increases from 51.73%to 60.82%,the vertical sintering speed increases from 24.44 mm/min to 33.48 mm/min,the productivity increases from 0.77 t/(m^(2)·h)to 0.99 t/(m^(2)·h),and the solid fuel consumption decreases from 147.10 kg/t to 130.29 kg/t.The process mineralogy shows that compared with the reference,the pores and cracks of the separated granulating sinter are greatly reduced and the microstructure is more dense.Meanwhile,the wetting degree between the main solid phase iron spinel and the liquid phase is improved,and the acicular and interleaved SFCA are increased,therefore the consolidation conditions of sinter are greatly i

关 键 词：烧结 红土镍矿 分流制粒 透气性 燃料分加 

分 类 号：TF046.4[冶金工程—冶金物理化学]