欢迎访问过程工程学报, 今天是

›› 2002, Vol. 2 ›› Issue (5): 0-0.

• 5 •    

曝气式反应器中木质素过氧化物酶的合成及对印染废水配制液的脱色处理

章燕芳, 李华钟, 华兆哲, 陈坚   

  1. 江南大学生物工程学院，工业生物技术教育部重点实验室，江苏 无锡 214036
  • 出版日期:2002-10-20 发布日期:2002-10-20

Leaching of a Low-grade Refractory Tantalum–Niobium Ore by KOH Sub-molten Salt

ZHOU Hong-ming, ZHENG Shi-li, ZHANG Yi   

  1. Institute of Processing Engineering, Chinese Academy of Sciences, Beijing 100080, China
  • Online:2002-10-20 Published:2002-10-20

PDF

被引次数

17

摘要： 比较了黄孢原毛平革菌在3种生物反应器(搅拌式反应器、鼓泡式反应器、曝气式反应器)中合成木质素过氧化物酶(LiP)和锰过氧化物酶(MnP)的差异. 结果表明，曝气式反应器对酶的合成(尤其是LiP)最为有利. 考察了曝气式反应器中半连续培养和连续培养两种方式下酶的合成和橙I脱色情况，发现半连续培养可使培养体系长时间保持较高酶活力，置换比例为1/2时染料废水可连续脱色5批，脱色率达到90%以上，比脱色率在46.7 g/(g×d)以上. 连续培养条件下酶很快失活，废水的脱色率迅速下降. 在曝气式反应器中用半连续培养的方式(置换比例1/2)对实际印染废水进行处理，可处理废水4批，前3批脱色率达到90%以上，第4批有明显下降.

关键词: 曝气式反应器, 黄孢原毛平革菌, 木质素过氧化物酶, 印染废水配制液, 脱色

Abstract: A new leaching process for a low-grade refractory tantalum–niobium ore by KOH sub-molten salt was studied. The effects of leaching temperature, initial KOH concentration, leaching time and mass ratio of alkali to ore on the leaching rate of Nb and Ta were investigated. The results show that the leaching rates of Nb and Ta can be raised as high as 98% and 96% respectively, 10% higher than those of the hydrofluoric acid process. Thus, the utilization rate of the refractory tantalum–niobium resource was greatly improved. In the process, KOH sub-molten salt was used as reaction medium to substitute the highly concentrated and toxic HF solution of the traditional process. Consequently, the pollution of F– was eliminated at the source. This provides a new way for extracting Nb–Ta from the tantalum–niobium ore.

Key words: KOH, sub-molten salt, niobium–tantalum ore, leaching

中图分类号: