工业副产硫酸钡湿法制备碳酸钡工艺研究
Study on wet preparation of barium carbonate from industrial by-product barium sulfate
为实现湿法磷酸生产过程中脱硫副产硫酸钡的高价值资源化利用,开发了一条以脱硫硫酸钡为原料、碳酸钠为转化剂,制备碳酸钡的工艺路线。通过直接转化法,重点考察了反应温度、时间、搅拌转速、碳酸钠浓度及液固比对硫酸钡转化率的影响。实验发现各参数均对转化率有显著影响,在优化条件(90℃、120 min、150 r/min、3.6 mol/L碳酸钠、液固比6∶1)下,硫酸钡转化率最高达96.46%,所得碳酸钡纯度为96.18%,可返回脱硫工序循环使用。分析表明,适宜条件通过推动反应平衡正向移动并强化传质,有效提升了转化率。该工艺成功将工业副产硫酸钡转化为高附加值碳酸钡,不仅为湿法磷酸固废治理提供了新途径,也为碳酸钡的清洁生产提供了理论依据与工艺参考。
To achieve high-value resource utilization of the desulfurized barium sulfate by product from wet process phosphoric acid production,this study developed a process route for preparing barium carbonate using desulfurized barium sulfate as the raw material and sodium carbonate as the conversion agent.Via the direct conversion method,the effects of reaction temperature,reaction time,stirring speed,sodium carbonate concentration,and liquid to solid ratio on the conversion rate of barium sulfate were investigated.Experiments results showed that all parameters significantly influenced the conversion rate.Under optimized conditions (90℃,120 min,150 rpm,3.6 mol/L sodium carbonate,liquid to solid ratio of 6∶1),the maximum conversion rate of barium sulfate reached 96.46%,and the purity of the obtained barium carbonate was 96.18%,which can be returned to the desulfurization process for recycling use.Analysis indicated that the suitable conditions enhanced the conversion rate by shifting the reaction equilibrium forward and intensifying the mass transfer process.This process successfully converts industrial by product barium sulfate into high value added barium carbonate,providing not only a new approach for managing solid waste from wet process phosphoric acid production but also a theoretical basis and technical reference for the cleaner production of barium carbonate.
工业副产硫酸钡 / 碳酸钡 / 直接转化法 / 碳酸钠 / 湿法磷酸
industrial by-product barium sulfate / barium carbonate / direct conversion method / sodium carbonate / wet-process phosphoric acid
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