摘要
作为钒渣体系的重要组成部分,查明硅酸盐矿物在焙烧阶段的变化特征有助于更好掌握钒渣体系在焙烧过程的演变规律,对指导焙烧工艺的改进具有重要意义。文章综合应用X射线衍射分析仪、矿物分析仪、扫描电镜以及能谱仪等技术手段对高钙钒渣焙烧阶段主要硅酸盐矿物的变化特征进行分析,结果表明:铁橄榄石的氧化分解温度区间为334~850℃,分解初期颗粒内外形成非晶态石英,随温度上升,铁橄榄石颗粒外缘出现逐渐加厚的氧化铁边直至颗粒完全分解,其分解产物为石英和氧化铁;钙铁辉石的氧化分解温度区间为334~850℃,分解初期同样以颗粒内外形成非晶态石英为标志,随温度上升,钙铁辉石颗粒外缘出现钒酸钙环带和氧化铁直至颗粒完全分解,其分解产物主要为石英、钒酸钙和氧化铁;硅酸二钙的反应温度区间为640~850℃,反应初期以颗粒外缘出现钒酸钙环带为标志,随温度升高,硅酸二钙逐渐分解,其分解产物主要为钒酸钙、石英和氧化铁。
As an important part of the vanadium slag system,finding out the various characteristics of silicate minerals in the roasting stage will help to better grasp the evolution law of the vanadium slag system during the roasting process,and it is of great significance to guide the improvement of the roasting process.In this paper,the variation characteristics of main silicate minerals in the roasting stage of high calcium vanadium slag were analyzed through X-ray diffraction analyzer,mineral analyzer,scanning electron microscope and energy dispersive spectrometer.The results show that the temperature range of oxidative decomposition of fayalite is 334~850℃.At the initial stage of decomposition,amorphous quartz forms inside and outside the particles.With the increase of temperature,a gradually thickened iron oxide edge forms on the outer edge of fayalite particles until the particles are completely decomposed,and its decomposition products are quartz and iron oxide.The temperature range of oxidative decomposition of hedenbergite is 334~850℃,and the initial stage of decomposition is also marked by the formation of amorphous quartz inside and outside the particles.As the temperature rises,calcium vanadate ring and iron oxide appears on the outer edge of the hedenbergite particles until the particles are completely decomposed.And its decomposition products are mainly quartz,calcium vanadate and iron oxide.The reaction temperature range of dicalcium silicate is 640~850℃,and the initial stage of the reaction is marked by the presence of a calcium vanadate ring on the outer edge of the particles.With the increase of temperature,dicalcium silicate is gradually decomposed,and its decomposition products are mainly calcium vanadate,quartz and iron oxide.
作者
高健
史志新
钟祥
GAO Jian;SHI Zhixin;ZHONG Xiang(State Key Laboratory of Vanadium and Titanium,Resources Comprehensive Utilization,Panzhihua 617000,China;Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,China;Sichuan Panyan Testing Technology Co.,Ltd.,Panzhihua 617000,China)
出处
《硅酸盐通报》
CAS
北大核心
2022年第5期1734-1741,共8页
Bulletin of the Chinese Ceramic Society
关键词
高钙钒渣
硅酸盐矿物
铁橄榄石
钙铁辉石
硅酸二钙
焙烧过程
high calcium vanadium slag
silicate mineral
fayalite
hedenbergite
dicalcium silicate
roasting process
