高铁型煤系高岭土矿物学属性及其煅烧相变与活化效能  

Mineralogical Properties of Iron-Rich Coal-Measuries Kaolin Clay and Its Phrase Transform and Reactivity Activation in Calcination

作　　者：杨红梅 吴逍[1,2] 杨宜坪 苏小丽 王辅亚 朱建喜[1,2] 何宏平[1,2,3] YANG Hongmei;WU Xiao;YANG Yiping;SU Xiaoli;WANG Fuya;ZHU Jianxi;HE Hongping(CAS Key Laboratory of Mineralogy and Metallogeny,Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;CAS Center for Excellence in Deep Earth Science,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,China)

机构地区：[1]中国科学院矿物学与成矿学重点实验室,广东省矿物物理与材料研究开发重点实验室,中国科学院广州地球化学研究所,广州510640 [2]中国科学院深地科学卓越创新中心,广州510640 [3]中国科学院大学,北京100049 [4]景德镇陶瓷大学材料科学与工程学院,江苏景德镇333403

出　　处：《硅酸盐学报》2024年第10期3142-3149,共8页Journal of The Chinese Ceramic Society

基　　金：广东省重点领域研发计划(2020B0101370003)。

摘　　要：煤矸石含有丰富的高岭土矿物资源,对其进行资源化利用是处置这类大宗固体废弃物的重要途径,但其加工方式常受到矿物学属性的制约。以产自四川宜宾的高铁型煤系高岭土为例,采用X射线荧光光谱法、X射线粉晶衍射、扫描电子显微镜和热重-差示扫描量热法等分析测试手段研究了该煤系高岭土的化学成分、物相组成、微观形貌和热效应特征,探讨了矿物属性对热活化制备偏高岭土的影响。结果表明,宜宾煤系高岭土的主要组成矿物及其质量分数为低结晶度的高岭石(56%)、固定碳(15%)、石英(12%)和含铁矿物(11%)等;在煅烧过程中,高岭石从413℃开始脱除羟基,晶层在550℃逐渐变得无序,受其他组分影响,830℃时完全转变为非晶态的偏高岭石,质量损失合计26.24%;同时,黄铁矿和菱铁矿发生氧化,煅烧产物中出现含量较高的赤铁矿。此煤系高岭土经煅烧后活性显著增强,Al2O3溶出率在750℃时达到最高(68.47%,质量分数)。本工作可为高铁型煤系高岭土资源的综合利用提供矿物学依据和开发指导。Introduction The extraction and utilization of coal inevitably lead to the generation of significant solid waste,including coal gangue.This byproduct is rich in kaolin mineral resources,and their effective utilization presents a critical strategy for the management of such a bulk solid waste,offering substantial environmental and economic benefits.The processing methodologies are often hindered by the inherent mineralogical properties of the materials.Kaolinite minerals are central to the chemical reactivity in calcined coal kaolin clay,the content and characteristics of kaolinite can vary significantly in different coal kaolin sources due to the diversity in coal-forming geological conditions.It is thus necessary to clarify the mineralogical properties of kaolinite from various sources for the innovative application of coal gangue.In this paper,a high-iron coal-series kaolin clay was analyzed.In addition,the impact of mineralogical properties on the thermal activation and preparation of calcined kaolin clay was also investigated.Methods A high-iron coal-series kaolin clay was obtained as a representative sample from Sichuan,China.The chemical composition, phase composition, microstructure, and thermal behavior of the high-iron coal-series kaolinproperties were determinedby X-ray fluorescence spectrometry (XRF), X-ray powder crystal diffraction (XRD), scanning electron microscopy (SEM), andthermogravimetry-differential scanning calorimetry (TG-DSC).Results and discussion The results reveal that the chemical composition of Yibin coal-series kaolin clay is predominantlycomposed of SiO_(2), Al2O3 and Fe_(2)O_(3), with small contents of CaO, MgO, SO3 and TiO_(2), accounting for a total oxide mass of 71.84%.This coal-series kaolin clay could be categorized as high-iron coal-series kaolin clay because the content of Fe_(2)O_(3) is 8.54%. Thecoal-series kaolin clay calciated exhibits a loss mass of 28.14%, which is attributed to the volatile matter and fixed carbon (15% in themass). The principal minerals of high-iron c

关 键 词：煤矸石 煤系高岭土 高岭石 偏高岭石 煅烧活化 

分 类 号：TD985[矿业工程—选矿]