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›› 2001, Vol. 1 ›› Issue (1): 0-0.

• 1 •    

攀西高锰稀土矿泥盐酸浸取稀土动力学

田君,池汝安,朱国才,徐盛明   

  1. (1. 清华大学核能技术设计研究院,北京102201; 2. 江西省科学院应用化学研究所,江西 南昌330029
  • 出版日期:2001-02-20 发布日期:2001-02-20

Extraction of Sulfate Radical Polysaccharide from Laminaria Japonica Enhanced by Ultrasonic Wave in an Air-lift Reactor

WANG Qian, HUANG Meng, ZHAO Bing, WANG Yu-chun, OUYANG Fan, WU Zhi-chun   

  1. State Key Lab. Biochem. Eng., Inst. Chem. Metall., CAS, Beijing 100080, China
  • Online:2001-02-20 Published:2001-02-20

摘要: 采用盐酸浸取攀西高锰稀土矿泥,考察了浸取反应温度、矿石粒度及盐酸浓度对浸取速率的影响. 结果表明,当盐酸浓度为2 mol/L时,浸取过程符合缩核模型,表观活化能为9.59 kJ/mol,属内扩散控制,宏观动力学方程为:K=(4.15?10–4)/r02 · exp(9590/RT); 当盐酸浓度大于2 mol/L时,矿石中的锰被大量浸出,其结构被破坏,浸取过程为混合控制.

关键词: 高锰稀土矿泥, 稀土, 浸取速率, 动力学, 活化能, 反应速度常数

Abstract: The extraction of sulfate radical polysaccharide from Laminaria Japonica enhanced by ultrasonic wave in an air-lift reactor was reported. The optimal experimental conditions in this reactor (diameter 8 cm, working volume 1 liter) were pH 5.0, operation temperature 40oC, mass ratio of liquid to solid 45, extraction time 25 min, air flow rate 75 L/h, ultrasonic power 120 W, ultrasonic duty cycle 100%. Under the above conditions, the extraction ratio of sulfate radical polysaccharide reached 1.86%, higher than that by treatment for 3 h in water at 100oC and that under the same conditions without ultrasonic wave applied. The content of SO42- in sulfate radical polysaccharide of the former was 5.7% higher due to application of ultrasonic wave. The experimental results showed that this novel extraction process is prospective in the extraction of polysaccharide from seaweed.

Key words: air-lift reactor, ultrasonic wave, extraction, Laminaria japonica, sulfate radical polysaccharide

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