Abstract: The use of ultrasonic vibration in acetic acid extraction of Ca2+ from wollastonite increased obviously the extraction ratio of Ca2+ ion. When acetic acid extraction was carried out with 200—300 mesh wollastonite，weight fraction of acetic acid 25%，the frequency of ultrasonic 32 kHz，60 oC，3 h，the extraction rate of Ca2+ was 43.0 %. Under the same conditions it was 27.9 % without ultrasonic vibration，the relative efficiency increased by 54 %. When the wollastonite particle was larger in size，the extraction rate of Ca2+ with ultrasonic vibration was much higher than that without ultrasonic vibration. A higher extraction rate of Ca2+ was also obtained when the extraction reaction was carried out at a lower temperature. Therefore，energy consumption was reduced markedly when ultrasonic vibration was used.

摘要： 研究了超声振荡技术应用于乙酸萃取硅灰石时的钙离子萃取率。表明当硅灰石为200～300目，乙酸的质量分数为25%，超声波频率为32 kHz，反应温度60 ℃，反应时间3 h，固体硅灰石中钙离子的萃取率为43.0%；而在相同条件下无超声波时，钙离子的萃取率仅为27.9 %，相对效率提高54 %。当硅灰石的颗粒较大时，超声振荡条件下钙离子的萃取率比无超声时的要大得多，在较低温度时也可获得较高的萃取率，这些都可大大降低乙酸萃取工艺的能耗。