石煤中五价钒的检测方法及碱浸规律  

A method for detecting vanadium(V)in stone coal and the law of its alkaline leaching

作　　者：马子洋 闫柏军[1] MA Ziyang;YAN Baijun(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《有色金属科学与工程》2018年第1期45-50,共6页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(51534001)

摘　　要：V_2O_3、VO_2、V_2O_5纯试剂在不同反应温度、时间、NaOH浓度条件下进行碱溶,得到各个钒氧化物的溶解规律,从而确定分离不同价态钒氧化物的条件.利用电位滴定法检测碱溶分离液中的V^(5+)含量,验证检测的准确性.采用上述方法,在不同温度、时间条件下,对石煤进行空白焙烧,然后碱浸处理,并检测浸出液中V^(5+)的含量,发现石煤氧化焙烧过程中,V^(5+)含量在600℃开始上升,700℃以后趋于稳定;700℃以下时,时间对V^(5+)含量影响不大,当超过700℃后,随着时间的延长,V^(5+)的转变率增加明显,3 h后基本趋于稳定.In the present study,the dissolution rules of various vanadium oxides in alkaline solution at different reaction temperatures,times and NaOH concentrations were studied,and the experimental conditions of separating the vanadium oxides in different valence states were determined.Subsequently,the V5+content in the alkaline solution was determined by potentiometric titration,and its accuracy of detectingV5+was verified.Based on the mentioned methods above,the vanadium in different valence states in the blank roasting at different calcination temperatures and times were separated by alkali leaching,and the content of V5+in the leaching solution was detected.The experimental results were summarized as follows:in the calcination process,the V5+content began to rise at 600℃and tended to be stable at 700℃.The influence of time on V5+content was not obvious below 700℃.When the temperature was above 700℃,the conversion rate of V5+increased obviously over time,and tended to be stable after 3 hours.

关 键 词：石煤 钒 碱溶 分离 电位滴定法 

分 类 号：TF841.3[冶金工程—有色金属冶金] O655.23[理学—分析化学]