铬酸钡与硫酸氢钠固液反应制备重铬酸钠的过程强化  

Process intensification of Na_2Cr_2O_7 synthesis by solid-liquid reaction between BaCrO_4 and NaHSO_4

作　　者：吴海峰 全学军[1] 李纲 程雯 秦险峰 Wu Haifeng;Quan Xuejun;Li Gang;Cheng Wen;Qin Xianfeng(College of Chemistry and Chemical Engineering,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学化学化工学院,重庆400054

出　　处：《无机盐工业》2018年第10期21-24,共4页Inorganic Chemicals Industry

基　　金：重庆市高校优秀成果转化项目(KJZH17128)

摘　　要：铬铁矿液相氧化法可以得到铬酸钠和高浓度碱的混合物,前期研究表明,采用氢氧化钡可以较好地实现从高碱介质中分离铬酸根,形成铬酸钡中间体。然而,钡盐在传统的加热搅拌模式下转化制备重铬酸钠,存在反应过程时间长、效率低的问题。在分析铬酸钡固液反应控制步骤的基础上,研究了球磨搅拌反应模式对该固液转化反应过程的强化作用。系统考察了反应温度、时间、液固比(液固体积质量比)、料球比(物料和磨球的质量比)、物料配比(铬酸钡与硫酸氢钠的物质的量比)、固液混合速率对铬酸钡转化率的影响,并得到了较好的工艺参数:反应温度为180℃、反应时间为120 min、液固比为10 m L/g、料球比为2∶1、物料配比为1∶1、固液混合速率为50 r/min,在此条件下得到铬酸钡的转化率为93%。A mixture of sodium chromate and high concentration alkali can be obtained by liquid phase oxidation of chromite.Previous studies have shown that barium hydroxide can be used to separate chromate from high alkali medium and form barium chromate intermediate.However,the conversion of barium salt to sodium dichromate in the conventional heating and stirring mode has the problem of long reaction time and low efficiency.Based on the analysis of the control process of solid-liquid reaction of barium chromate,the strengthening effect of the milling reaction mode on the solid-liquid conversion reaction was studied.The effects of reaction temperature,time,liquid-solid ratio(volume and mass ratio),material-ball ratio(mass ratio),reactant amount of substance ratio and solid-liquid mixing rate on the conversion of barium chromate was studied,and the better process parameters were obtained:reaction temperature was 180℃,reaction time was 120 min,liquid-solid ratio was 10 mL/g,material-ball ratio was 2∶1,reactant amount of substance ratio was 1∶1 and solid-liquid mixing rate was 50 r/min.Under the optimal conditions,the conversion of barium chromate was 93%.

关 键 词：固液反应 球磨 重铬酸钠 铬酸钡 

分 类 号：TQ136.11[化学工程—无机化工]