熔融钒渣钙化及酸浸过程动力学研究  

Study on Calcification of Molten Vanadium Slag and Kinetics of Acid Leaching Process

作　　者：瞿金为 董文霞 翁小影 豆志河[2] 马娜 QU Jinwei;DONG Wenxia;WENG Xiaoying;DOU Zhihe;MA Na(Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization,Hezhou University,Hezhou 542899,China;Key Laboratory for Ecological Utilization of Multimetallic Mineral,Ministry of Education,Northeastern University,Shenyang 110819,China;State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]贺州学院广西碳酸钙资源综合利用重点试验室,广西贺州542899 [2]东北大学多金属共生矿生态化冶金教育部重点试验室,沈阳110819 [3]武汉科技大学国家环境保护矿冶资源利用与污染控制重点试验室,武汉430081

出　　处：《有色金属工程》2024年第3期70-81,共12页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(U1908225);广西科技基地和人才专项(桂科AD23026079);广西大学生创新创业训练计划(S202311838096);广西高校中青年项目(2023KY0739);贺州学院博士科研基金(2023BSQD06);国家环境保护矿冶资源利用与污染控制重点实验室开放基金(HB202202)。

摘　　要：针对现有转炉钒渣钙化工艺中存在流程长和能耗高的弊端,直接利用转炉中熔融钒渣的热量,在分离出半钢后,向熔融钒渣中加入氧化钙,使含钒物相发生钙化转型生成易溶于酸的钒酸钙。由Factsage8.1软件计算得到熔融钒渣可能发生的化学反应的热力学结果。研究过程中采用XRF、ICP、XRD和SEM/EDS等技术进行表征。XRD结果表明,随着CaO添加量的增加,熔融钒渣中逐渐形成CaV_(2)O_(5)、Ca_(7)V_(4)O_(17)、CaVO_(3)和Ca_(3)V_(2)O_(8)。当CaO添加过多后,也会形成Ca_(2)SiO_(4)和CaTiO_(3),这些物相会包裹部分钒,降低钒的浸出率。而后对钙化钒渣进行了酸浸提钒试验,考察了钒渣粒度、浸出温度、酸浓度和液固比对钒浸出率的影响,动力学计算结果可知,酸浸过程的表观活化能为11.56 kJ/mol,表明钙化钒渣的酸浸反应为内扩散控制。In view of the disadvantages of long process and high energy consumption in the existing calcification process of vanadium slag in converter,the heat of molten vanadium slag in converter was directly used.in this study.After separating the semi-steel,calcium oxide was added to the molten vanadium slag to make the vanadium-containing phase undergo calcification transformation to produce calcium vanadate which was easily soluble in acid.The thermodynamic results of the possible chemical reaction of molten vanadium slag were calculated by Factsage8.1 software.During the study,XRF,ICP,XRD and SEM/EDS were used for characterization.XRD results showed that CaV_(2)O_(5),Ca_(7)V_(4)O_(17),CaVO_(3) and Ca_(3)V_(2)O_(8) were gradually formed in the molten vanadium slag with the increase of CaO addition.When too much CaO was added,Ca_(2)SiO_(4) and CaTiO_(3) would also be formed,which would wrapp part of vanadium and reduce the leaching rate of vanadium.And then,the effects of calcified vanadium slag particle size,leaching temperature,acid concentration and liquid to solid ratio on the leaching rate of vanadium were investigated.The kinetic calculation results showed that the apparent activation energy of the acid leaching reaction was 11.56 kJ/mol,indicating that the acid leaching process of calcified vanadium slag was controlled by internal diffusion.

关 键 词：熔融钒渣 钙化 浸出率 动力学 

分 类 号：TF841.3[冶金工程—有色金属冶金] TF111