Effect of impurity ions on preparation of novel saponifier for rare earth extraction

Magnesium bicarbonate, prepared by the carbonation of magnesium hydroxide slurry, was used as a novel saponifier to eliminate the ammonia nitrogen pollution in the rare earth extraction separation process. The effect of impurity ions introduced by system on the carbonation reaction of magnesium hydr...

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Bibliographic Details
Published inJournal of rare earths Vol. 31; no. 9; pp. 905 - 910
Main Author 肖燕飞 冯宗玉 黄小卫 黄莉 徐旸 侯永可 王猛
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2013
Subjects
Carbonation
Conversion
Extraction
Impurities
impurity ions
Magnesium
magnesium bicarbonate
Magnesium hydroxide
Rare earth metals
rare earths
saponifier
Separation
杂质离子
氢氧化镁
皂化
碳酸化反应
离子对
稀土离子
编制
萃取
impurity ions
magnesium bicarbonate
saponifier
rare earths
carbonation
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(12)60377-9

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Summary:Magnesium bicarbonate, prepared by the carbonation of magnesium hydroxide slurry, was used as a novel saponifier to eliminate the ammonia nitrogen pollution in the rare earth extraction separation process. The effect of impurity ions introduced by system on the carbonation reaction of magnesium hydroxide was studied in the work. The results showed that the presence of Ca2＋could lead to side reactions so as to reduce the conversion rate of magnesium hydroxide, and a small number of rare earth ions would have great influence on the carbonation reaction. What’s more, there was no influence on carbonation reaction with the low concen-tration of Na＋or Mg2＋, the conversion rate of magnesium hydroxide could reach above 96%. This paper showed a practical theory which could provide scientific guidance for the preparation of novel saponifier in rare earth extraction separation process.
Bibliography:Magnesium bicarbonate, prepared by the carbonation of magnesium hydroxide slurry, was used as a novel saponifier to eliminate the ammonia nitrogen pollution in the rare earth extraction separation process. The effect of impurity ions introduced by system on the carbonation reaction of magnesium hydroxide was studied in the work. The results showed that the presence of Ca2＋could lead to side reactions so as to reduce the conversion rate of magnesium hydroxide, and a small number of rare earth ions would have great influence on the carbonation reaction. What’s more, there was no influence on carbonation reaction with the low concen-tration of Na＋or Mg2＋, the conversion rate of magnesium hydroxide could reach above 96%. This paper showed a practical theory which could provide scientific guidance for the preparation of novel saponifier in rare earth extraction separation process.
11-2788/TF
rare earths; magnesium bicarbonate; saponifier; carbonation; impurity ions
XIAO Yanfei , FENG Zongyu, HUANG Xiaowei , HUANG Li ,XU Yang,HOU Yongke , WANG Meng （National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Grirem Advanced Materials Co., Ltd., Bei- jing 100088, China）
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ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60377-9