摘要
对钒渣原料及钙化焙烧过程进行研究,并采用反应热力学和动力学对其焙烧机理进行理论论证。结果表明:钙化焙烧主要包括铁氧化、橄榄石氧化分解、尖晶石氧化分解及钙化反应;经理论和数据分析,含钙相的形成顺序依次为CaV_(2)O_(6)、Ca_(2)V_(2)O_(7)、Ca_(3)V_(2)O_(8)、CaSiO_(3)。高温情况下,过量的CaO会与钒反应生成Ca_(3)V_(2)O_(8)、CaSiO_(3)。钒尖晶石的氧化钙化过程受三级反应控制,表观活化能为282.45kJ/mol。浸出实验中,焙烧温度860℃、焙烧时间120min所得焙烧渣的钒浸出率较高,与钙化焙烧理论分析结果一致。
Vanadium slag,as raw material,went through calcified roasting processes in the study,and the thermodynamics and kinetic analysis were conducted for verifying the roasting mechanism.The results show that calcified roasting process mainly includes iron oxidation,oxidative decomposition of olivine and spinel,as well as calcification.Based on theoretical and data analysis,calcium-containing phases are formed in the following sequence:CaV_(2)O_(6),Ca_(2)V_(2)O_(7),Ca_(3)V_(2)O_(8),CaSiO_(3).At a high temperature,excess CaO reacts with vanadium to generate Ca_(3)V_(2)O_(8) and CaSiO_(3).The oxidation and calcification processes of vanadium spinel are controlled by a third-order reaction,and the apparent activation energy is 282.45 kJ/mol.In the leaching experiment,the leaching rate reaches the maximum after roasting at 860℃for 120 min,which is consistent with the results obtained from theoretical analysis of calcified roasting process.
作者
邵甲骥
孙小涵
贺永东
赵亿坤
陈守俊
梁飞龙
SHAO Jiaji;SUN Xiaohan;HE Yongdong;ZHAO Yikun;CHEN Shoujun;LIANG Feilong(School of Materials Science and Engineering,Xinjiang University,Urumqi 830046,Xinjiang,China;Shandong Energy Digital Technology Co.,Ltd.,Jinan 250000,Shandong,China;School of Physical Science and Technology,Xinjiang University,Urumqi 830046,Xinjiang,China;Xinjiang Sheng′an New Material Technology Co.,Ltd.,Hami 839000,Xinjiang,China;Xinjiang Xiangrun New Material Technology Co.,Ltd.,Hami 839000,Xinjiang,China)
出处
《矿冶工程》
北大核心
2025年第1期103-108,共6页
Mining and Metallurgical Engineering
基金
国家自然科学基金(51861033)
新疆维吾尔自治区科技厅重点研发专项(2020B02007)。
关键词
钒渣
钙化焙烧
相变过程
热力学
动力学
提钒
vanadium slag
calcified roasting
phase transition
thermodynamics
kinetics
vanadium extraction
