BaCO_(3)芒硝法制备BaSO_(4)的探索研究  

Exploratory Study on the Preparation of BaSO_(4)from BaCO_(3)Using Mirabilite Method

作　　者：谢宁 张昌 王婧 杨贵惠 索超辉 杨斌 Xie Ning;Zhang Chang;Wang Jing;Yang Guihui;Suo Chaohui;Yang Bin(School of Chemistry and Chemical Engineering,Ankang University,Ankang,Shaanxi 725000;Southern Shaanxi Green Fine Chemical Research Platform,Ankang,Shaanxi 725000;Ankang Research Centre of New Nano-materials Science and Technology,Ankang University,Ankang,Shaanxi 725000)

机构地区：[1]安康学院化学化工学院,陕西安康725000 [2]陕南绿色精细化工研究平台,陕西安康725000 [3]安康学院安康市纳米新材料工程技术研究中心,陕西安康725000

出　　处：《非金属矿》2024年第2期29-32,共4页Non-Metallic Mines

基　　金：安康市2023年度“揭榜挂帅”重点科技项目(AK2023-JBGS-01);安康学院横向课题(2023AKHX068);安康学院高层次人才启动项目(2020AYQDZR12);陕西省大学生创新创业训练计划项目(S202211397042)。

摘　　要：为改进碳酸钡硫酸法制备BaSO_(4)的工艺,以BaCO_(3)和Na_(2)SO_(4)为原料制备BaSO_(4)。在通过热力学计算得到此反应在100℃以下可以自发进行的基础上,研究了反应时间、n值(Na_(2)SO_(4)和BaCO_(3)的摩尔比)、反应温度和NH_(4)Cl盐效应对所制备粉体物相组成和BaSO_(4)收益率的影响。结果表明,反应温度越低,越有利于此反应自发进行。反应时间越长,n值越大,BaSO_(4)收益率越高,但最高收益率仅为58%,NH_(4)Cl盐效应可进一步提升收益率。当NH_(4)Cl浓度为2.0 mol/L,n为4.0,反应温度为30℃,反应时间为15 h时,BaCO_(3)可完全转化为BaSO_(4),即收益率达到100%。制备的BaSO_(4)晶粒呈规则椭球状,尺寸均一且小于250 nm,易聚集形成形状不规则的条状或球状团聚体。In order to improve the process of preparing BaSO_(4)by barium carbonate sulfuric acid method,BaSO_(4)was prepared by BaCO_(3)and Na_(2)SO_(4).On the basis of thermodynamic calculations that this reaction can occur spontaneously below 100℃,the effects of reaction time,n value,reaction temperature,and NH_(4)Cl salt effect on the phase composition of the prepared powder and the yield of BaSO_(4)were studied.The results showed that the lower the reaction temperature,the more favorable it was for this reaction to occur spontaneously.The longer the reaction time was and the larger the n value was,the higher the yield of BaSO_(4)was,but the highest yield was only 58%,the yield could be further improved through the NH_(4)Cl salt effect.When the concentration of NH_(4)Cl was 2.0 mol/L,n was 4.0,the reaction temperature was 30℃and the reaction time was 15 h,BaCO_(3)could be completely converted to BaSO_(4),the yield was 100%.Under these conditions,the BaSO_(4)grains exhibited a regular elliptical shape,with uniform size below 250 nm,which were prone to aggregation to form irregularly shaped bar or spherical aggregates.

关 键 词：碳酸钡 芒硝法 硫酸钡 盐效应 

分 类 号：TQ132[化学工程—无机化工]