Abstract: According to the analysis on the production of borax by CO²- soda process,the reaction in this process can be divided into three parts:initial,main,and final reaction stages.The adsorption rate is faster than the reaction rates in the initial-and final-reaction stages,while the adsorption rate is first faster than reaction rate and then gradually become the same in the main reaction stage.Based on these characters of this process,the measurements for raising CO₂ partial pressure and reaction temperature were made to improve this process.The suitable process conditions were as follows:the carbonate decomposing rate for B₂O₃ in ascharite was 90%,reaction time was 9 h,CO₂ recovery rate was more than 96% and steam consumption was 1 292 kg (1 t borax).Compared with old process,the reaction time of new process has been shorted to half one of old process and energy consumption has also been reduced significantly.The new process can reduce CO₂ emission and improve environmental quality.  

Key words: CO²- soda process, borax；carbonate decomposing rate