摘要
锰铁矿渣作为冶金过程中产生的固体废弃物,富含铁、铝、锰等元素及硅酸钙物相。由于其活性较低,在水泥、掺合料等建材领域的利用率有限,导致大量废渣长期堆存,造成有价资源浪费。同时,锰元素的浸出毒性对生态环境构成的潜在威胁限制了企业的可持续发展。为了解决以上难题,本研究采用中温焙烧-酸浸-pH梯度回收协同处理方法,旨在实现锰铁矿渣中锰、铁、铝有价金属的高附加值利用,以及浸出渣的建筑材料资源化利用。通过单因素梯度实验设计,系统考察了焙烧条件(焙烧温度、保温时间)和酸浸过程(酸渣比、酸浸温度、酸浸时间)对铝、铁、锰元素浸出行为的影规律响,进而确定元素的最佳浸出条件。试验结果表明:(1)在焙烧温度800℃、保温时间60 min条件下,烧失率达24.52%,锰氧化物、铁氧化物等物相解离重组,高价态锰向低价态锰转变,同时铝和铁元素的活性得到了显著提升,从而增强了元素的浸出效率。(2)在酸渣比为10∶1、酸浸温度为80℃的条件下持续浸出70 min,此时,铁、铝、锰的浸出率分别可达83.26%、84.93%和69.63%,在此过程中,难溶性锰元素以钙榴石的形式被固定于浸出渣中,硅酸钙物相的存在显著提升了浸出渣在建材化利用方面的潜在价值。(3)采用“中温焙烧-酸浸回收”的协同处置方法,实现了锰铁矿渣中有价金属的高值化利用,同步完成浸出渣的无害化处置与建材化利用,为锰冶炼企业绿色可持续发展提供了参考。
As a solid waste produced in the metallurgical process,ferromanganese slag is rich in iron,aluminum,manganese and calcium silicate phases.Due to its low activity,its utilization rate in the field of building materials,such as cement and admixture,is limited,resulting in a large amount of waste residue being stored for a long time,resulting in a waste of valuable resources.At the same time,the leaching toxicity of manganese poses a potential threat to the ecological environment,which limits the sustainable development of enterprises.In order to solve the above problems,this study adopts the synergistic treatment method of medium temperature roasting-acid leaching-pH gradient recovery,aiming at realizing the high value-added utilization of manganese,iron and aluminum valuable metals in ferromanganese slag,as well as the resource utilization of leaching residue as building materials.Through the single factor gradient experimental design,the effects of roasting conditions(roasting temperature,holding time)and acid leaching process(acid slag ratio,acid leaching temperature,acid leaching time)on the leaching behavior of aluminum,iron and manganese were systematically investigated,and the optimum leaching conditions of elements were determined.The test results show that:(i)Under the condition of roasting temperature of 800℃and holding time of 60 min,the loss on ignition was 24.52%.The phase of manganese oxide and iron oxide was dissociated and recombined,and the high valence manganese was transformed into low valence manganese.At the same time,the activity of aluminum and iron elements was significantly improved,thus enhancing the leaching efficiency of elements.(ii)Under the condition of an acid-slag ratio of 10∶1 and an acid leaching temperature of 80℃,the leaching rate of iron,aluminum and manganese can reach 83.26%,84.93%and 69.63%after 70 min continuous leaching.In this process,the insoluble manganese element is fixed in the leaching residue in the form of garnet,and the existence of calcium silicate phase significantly improves its potential value in the utilization of building materials.(iii)The co-processing method of'medium temperature roasting-acid leaching recovery'is adopted to realize the high-value utilization of valuable metals in ferromanganese slag,and the harmless disposal and building materials utilization of leaching slag are completed simultaneously,which provides a reference for the green and sustainable development of manganese smelting enterprises.
作者
徐兴卫
王志彬
马宏彪
吕鹏
李燕
XU Xingwei;WANG Zhibin;MA Hongbiao;LYU Peng;LI Yan(College of Architectural Engineering,Kunming Metallurgy College,Kunming 650033,China;Collaborative Innovation Center for Waste Resource Utilization and New Material Preparation,Kunming 650033,China;Yunnan Huajun New Material Technology Co.,Ltd.,Kunming 650033,China;Yunnan Qiaoxiao Slag Technology Co.,Ltd.,Kunming 650033,China)
出处
《材料导报》
北大核心
2025年第S2期484-488,共5页
Materials Reports
基金
云南省技术委托开发重点项目(2023530101000771)
云南省技术委托开发重点项目(2025530103001025)。
关键词
锰铁矿渣
金属元素回收
中温焙烧
浸出
高值化利用
ferromanganese slag
recovery of metal elements
medium temperature roasting
leaching
high-value utilization
