摘要
研究不同摩尔比MgO−V_(2)O_(5)混合物的固相反应行为。采用等温溶解平衡法测定25~55℃下反应产物(钒酸镁)在水中的溶解度,并研究其在稀硫酸中的溶解行为和动力学。结果表明,MgO与V_(2)O_(5)的摩尔比和焙烧温度对固相反应产物的相变有较大影响;MgV_(2)O_(6)在水中溶解度最大,其次是Mg_(2)V_(2)O_(7)和Mg_(3)V_(2)O_(8);随着pH值从4.0降低到2.5,温度从30℃增加到70℃,钒酸镁在稀硫酸中的溶解率显著增加,其在稀硫酸中的溶解符合二级伪均相反应模型。
The solid-state reaction behavior of MgO−V_(2)O_(5) mixtures with different molar ratios was explored.The solubility of the solid-state reaction products(magnesium vanadates)in water at 25−55℃ 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 V_(2)O_(5) and roasting temperature significantly influenced the phase transformation of the solid-state reaction product.MgV_(2)O_(6) exhibits the highest solubility in water,followed by Mg_(2)V_(2)O_(7) and Mg_(3)V_(2)O_(8).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℃.The dissolution of magnesium vanadate can be described using a second-order pseudo-homogeneous reaction model.
作者
向俊一
罗明帅
白路伟
陆曦
朱忠棚
黄青云
朱奎松
裴贵尚
吕学伟
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(College of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;College of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)
基金
supported by the National Natural Science Foundation of China (No.52004044)
the Natural Science Foundation of Chongqing,China (No.CSTB2022NSCQ-MSX0801)
the Foundation of Chongqing University of Science and Technology,China (No.ckrc2022030)
the Graduate Research Innovation Project of Chongqing University of Science and Technology,China (No.YKJCX2220214)
the Science and Technology Innovation Training Program of Chongqing University of Science and Technology,China (No.2022046)
the College Students’Innovation and Entrepreneurship Training Program of Chongqing University of Science and Technology,China (No.2022007).
