对利用钠碱法脱硫液中硫酸钠制碱的改进双循环工艺进行了技术经济分析。此工艺直接运用钠碱法脱硫液作为生产碳酸钠和硫酸铵的原料，具有原料利用率高、无污染排放及能耗低等优点。对6万t/a纯碱项目进行经济性分析，其设备投资为5 590万元，投资利润率为28.25%，内部收益率为19.75%，静态投资回收期为6.81 a，项目经济性较好，对进一步推广钠法脱硫工艺具有重要的指导意义。

A technical and economic analysis was carried out on an improved double?鄄cycle process using sodium sulfate for alkali production in a sodium?鄄alkali desulfurization solution.The process directly uses the sodium?鄄alkali desulfurization solution as raw material for producing sodium carbonate and ammonium sulfate，which has the advantages of high utilization rate of raw materials，no pollution discharge and low energy consumption.The economic analysis of the 60 000 t/a soda ash project was carried out，the equipment investment was 55.90 million yuan RMB，the investment profit rate was 28.25%，the internal rate of return was 19.75% and the static investment payback period was 6.81 a.The project was of good economics，which had an important guiding significance for further promotion of the sodium desulfurization process.