Phase transformation in solid-state reaction of MgO−V2O5 binary system and dissolution behavior of products

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Transactions of Nonferrous Metals Society of China Pub Date : 2024-06-01 DOI:10.1016/S1003-6326(24)66521-0

Jun-yi XIANG , Ming-shuai LUO , Lu-wei BAI , Xi LU , Zhong-peng ZHU , Qing-yun HUANG , Kui-song ZHU , Gui-shang PEI , Xue-wei LÜ

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Abstract

The solid-state reaction behavior of MgO−V₂O₅ mixtures with different molar ratios was explored. The solubility of the solid-state reaction products (magnesium vanadates) in water at 25−55 °C was measured using the isothermal solution saturation method. The dissolution behavior and kinetics of the magnesium vanadates in dilute sulfuric acid were also investigated. The results showed that the molar ratio of MgO to V₂O₅ and roasting temperature significantly influenced the phase transformation of the solid-state reaction product. MgV₂O₆ exhibits the highest solubility in water, followed by Mg₂V₂O₇ and Mg₃V₂O₈. The dissolution rate of magnesium vanadates in dilute sulfuric was significantly increased with the decrease of pH from 4.0 to 2.5 and the temperature increase from 30 to 70 °C. The dissolution of magnesium vanadate can be described using a second-order pseudo-homogeneous reaction model.

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氧化镁-V2O5 二元体系固态反应中的相变及产物的溶解行为

研究探讨了不同摩尔比的 MgO-V2O5 混合物的固态反应行为。采用等温溶液饱和法测量了固态反应产物（钒酸镁）在 25-55 ℃ 水中的溶解度。此外，还研究了钒酸镁在稀硫酸中的溶解行为和动力学。结果表明，氧化镁与 V2O5 的摩尔比和焙烧温度对固态反应产物的相变有显著影响。MgV2O6 在水中的溶解度最高，其次是 Mg2V2O7 和 Mg3V2O8。钒酸镁在稀硫酸中的溶解速率随着 pH 值从 4.0 降至 2.5 和温度从 30 ℃ 升至 70 ℃ 而显著增加。钒酸镁的溶解可以用二阶伪均相反应模型来描述。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.