Effects of Ti-and Mg-bearing minerals on hydrothermal formation of hydroandradite  

含钛、镁矿物对钙铁榴石水热形成的影响

作　　者：Hong-fei WU Xiao-lin PAN Ying-jie HE Hai-yan YU 吴鸿飞;潘晓林;何英杰;于海燕(东北大学多金属共生矿生态化冶金教育部重点实验室,沈阳110819;东北大学冶金学院,沈阳110819;沈阳市有色金属资源循环利用重点实验室,沈阳110819)

机构地区：[1]Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education,Northeastern University,Shenyang 110819,China [2]School of Metallurgy,Northeastern University,Shenyang 110819,China [3]Key Laboratory for Recycling of Nonferrous Metal Resources(Shenyang),Shenyang 110819,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第11期3762-3776,共15页中国有色金属学报（英文版）

基　　金：financial supports from the National Key R&D Program of China (No.2022YFC2904401);the National Natural Science Foundation of China (Nos.22078055,51774079);the Fundamental Research Funds for the Central Universities,China (No.N2225002)。

摘　　要：The effects of Ti-and Mg-bearing minerals on the crystal structure,morphology,particle size distribution,and formation mechanism of efficient desilication product of hydroandradite(HA)during hydrothermal conversion in a synthetic sodium aluminate solution were investigated via X-ray diffractometer,scanning electron microscope and particle size analyzer.During HA formation,anatase,rutile,and periclase dissolved in sodium aluminate solution engage in ion substitution reactions between Ti4+and Si4+,and between Mg^(2+)and Ca^(2+),respectively.However,dissolved hydromagnesite cannot enter into the HA.The content of HA after the hydrothermal reactions changes slightly with the increase of anatase and periclase contents,but it notably decreases with increased quantities of rutile and hydromagnesite.Ti-bearing minerals reduce the particle size and enhance the specific surface area of HA,whereas Mg-bearing minerals exert the opposite effect.The morphology of HA with Ti-and Mg-bearing minerals changes from spherical particles to flocculent structure and hexagonal plate-like particles.采用X射线衍射仪、扫描电镜和粒度分析仪研究在合成铝酸钠溶液水热转化过程中含钛、镁矿物对高效脱硅产物钙铁榴石晶体结构、微观形貌、粒度分布和形成机理的影响。结果表明,溶解在铝酸钠溶液中的锐钛矿、金红石和方镁石在钙铁榴石生成过程中分别发生Ti4+-Si4+和Mg^(2+)-Ca^(2+)离子取代反应,而溶解在铝酸钠溶液中的水菱镁石则不能进入钙铁榴石。钙铁榴石的含量随锐钛矿和方镁石含量的增加变化很小,而其含量随金红石和水菱镁石含量的增加大幅降低。含钛矿物使钙铁榴石的粒度减小、比表面积增大,而含镁矿物的影响正好相反。含钛、镁矿物的存在使钙铁榴石的微观形貌由球形颗粒转变为絮状结构和六方板状颗粒。

关 键 词：hydroandradite ANATASE RUTILE PERICLASE HYDROMAGNESITE DESILICATION hydrothermal conversion 

分 类 号：TF821[冶金工程—有色金属冶金]