电解锰渣二次提取锰和氨氮的研究
Research on second extraction of manganese and ammonianitrogen from eletrolytic manganese residue
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摘要: 锰渣处理是电解锰行业的一个重大环境问题。为了实现锰渣无害化处理和资源化利用，用蒸馏水和阳极液作提取剂，对从锰渣中二次提取锰和氨氮进行了研究。考察了液固比、提取剂种类、提取时间、提取温度、超声波作用对锰、氨氮提取效果的影响，且对提取前后的锰渣成分进行了检测与表征。研究结果表明：阳极液对锰的提取效果明显优于蒸馏水，而蒸馏水对氨氮的提取效果要优于阳极液；锰的最佳提取条件是以阳极液为提取剂，液固比(mL/g)为10∶1，在50℃下反应30 min，提取率达67.71%；氨氮的最佳提取条件是以蒸馏水为提取剂，液固比为10∶1，在50℃下反应50 min，提取率达66.12%；超声波作用能促进蒸馏水对锰的提取，但不利于蒸馏水对氨氮的提取。Abstract: The treatment of manganese slag is a significant environmental problem of electrolytic manganese industry. In order to realize the harmless resource utilization of manganese residue, second extraction of Mn and NH3-N from manganese residue with distilled water and anolyte as extractant was performed. The influence of liquid-solid ratio, extractant type, extraction time, temperature, ultrasonication on the extraction efficiency of Mn and NH3-N was invesigated, and the composition of manganese residue before and after extracting was detected and characterized. The results indicated that the extraction efficiency of Mn with anolyte was better than that with distilled water, while the extraction efficiency of NH3-N was the opposite. The optimum extraction efficiency of Mn was 67.71% which was obtained when the liquid-solid ratio (mL/g) was 10∶1 at 50℃ for 30 min using anolyte as extractant. The optimum extraction efficiency of NH3-N was 66.12% which was obtained when the liquid-solid ratio was 10∶1 at 50℃ for 50 min using distilled water as extractant. The ultrasound could promote the extraction of Mn with distilled water, however, it was not beneficial to the extraction of NH3-N.
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Key words:
- eletrolyzed-manganese slag /
- second ectraction /
- extraction effects /
- ultrasound wave
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