摘要
为优化碳酸锶溶解工艺,使碳酸锶的生产过程更加清洁,采用硝酸铵代替无机酸溶解碳酸锶。研究了粗碳酸锶在硝酸铵溶液中的溶解动力学。发现温度是影响溶解反应速度的最主要因素。铵离子浓度、搅拌速度、原料碳酸锶的纯度等都对溶解反应速度产生一定的影响;反应的最初阶段属于化学反应控制过程,反应机理符合缩芯模型。反应温度107℃时,测得溶解反应频率因子k0=7.019×1013,活化能E=108.338 kJ/mol。在较高的温度下,碳酸锶与硝酸铵反应是能进行到底的多相化学反应。
In order to make the technology more cleaner,ammonium nitrate is used to react with coarse strontium carbonate instead of inorganic acid, and the dissolution kinetics of strontium carbonate ore is studied in NH4 NO3 solution. It is found that the temperature is the most controlling factor. The effects of NH4 NO3 concentration, stirring intensity and the purity of strontium carbonate on the reaction rate should also be taken into consideration. At the beginning of the reaction, the dissolution process is a chemical control process, and the reaction mechanism is in accordance with shrink core model. The frequency factor k0= 7. 019 × 10^13 , the activation energy E = 108. 338 kJ/mol when the reaction temperature is at 107 ℃. The reaction of strontium carbonate and ammonium nitrate can be accomplished easily at high temperature.
出处
《无机盐工业》
CAS
北大核心
2006年第9期28-31,共4页
Inorganic Chemicals Industry
关键词
溶解动力学
碳酸锶
硝酸铵
缩芯模型
dissolution kinetics
strontium carbonate
ammonium nitrate
shrinking core model
