Method of separating lanthanum from rare earth nitrate slurry as well as rare earth ore concentrate separation method

The technology of rare earth nitrate and rare earth feed liquid is applied in the field of rare earth separation technology, and can solve the problems of unattractive commercial application prospect, high price and high cost

Inactive Publication Date: 2014-01-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has strong extraction ability and no problems of emulsification and loss of extractant, it is produced by American Cyanamid Co., so the cost is high and the price is expensive, so it is not attractive in commercial application prospects

Method used

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  • Method of separating lanthanum from rare earth nitrate slurry as well as rare earth ore concentrate separation method
  • Method of separating lanthanum from rare earth nitrate slurry as well as rare earth ore concentrate separation method
  • Method of separating lanthanum from rare earth nitrate slurry as well as rare earth ore concentrate separation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The method for separating lanthanum from rare earth nitrate feed liquid is as follows:

[0074] (1) Prepare P503 sulfonated kerosene solution with a volume ratio of 30% as the extraction agent, the mass of trivalent mixed rare earth in the rare earth nitrate feed solution is 71g / L rare earth feed solution, and adjust the pH of the feed solution to 2;

[0075] (2) Use 5mol / L sodium nitrate solution as the washing liquid, and use the fractional distillation extraction process for extraction. The number of stages in the extraction section is 5, and the number of stages in the washing section is 10. The flow ratio of the extraction agent, feed liquid and washing liquid is 8:10:2, obtain the raffinate containing lanthanum and the organic phase containing praseodymium and neodymium;

[0076] (3) The stripping liquid is 0.08mol / L sulfuric acid, the flow ratio of the organic phase containing praseodymium and neodymium to the stripping liquid is 0.8:0.2, and it is subjected to 8...

Embodiment 2

[0080] The method for separating lanthanum from rare earth nitrate feed liquid is as follows:

[0081] (1) Prepare a P503 n-heptane solution with a volume ratio of 40% as the extraction agent, the mass of the trivalent mixed rare earth in the rare earth nitrate feed solution is 110g / L rare earth feed solution, and adjust the pH of the feed solution to 2.6;

[0082] (2) Use 0.5mol / L lithium nitrate solution as the lotion, and use the fractional distillation extraction process for extraction. The number of stages in the extraction section is 12, the number of stages in the washing section is 3, and the flow ratio of the extraction agent, feed liquid, and lotion is 10:10:1.5, obtain the raffinate containing lanthanum and the organic phase containing praseodymium and neodymium;

[0083] (3) The back extraction liquid is 0.04mol / L nitric acid, the flow ratio of the organic phase containing praseodymium and neodymium to the back extraction liquid is 1.5:2, and the two-stage counterc...

Embodiment 3

[0087] The method for separating lanthanum from rare earth nitrate feed liquid is as follows:

[0088] (1) Prepare a P503 n-heptane solution with a volume ratio of 50% as the extraction agent, the mass of the trivalent mixed rare earth in the rare earth nitrate feed solution is 130g / L rare earth feed solution, and adjust the pH of the feed solution to 3;

[0089] (2) Use 0.5mol / L lithium nitrate solution as the lotion, and use the fractional distillation extraction process for extraction. The number of stages in the extraction section is 8, and the number of stages in the washing section is 5. The flow ratio of the extraction agent, feed liquid and lotion is 9:10:1.8, obtain the raffinate containing lanthanum and the organic phase containing praseodymium and neodymium;

[0090] (3) The stripping liquid is 0.01mol / L nitric acid, the flow ratio of the organic phase containing praseodymium and neodymium to the stripping liquid is 1.0:1.0, and it is back-extracted in 5 stages, the...

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Abstract

The invention discloses a method of separating lanthanum from rare earth nitrate slurry as well as a rare earth ore concentrate separation method. The rare earth nitrate slurry does not contain cerium and thorium. The method comprises the following steps: (1) preparing P503 alkane liquor with volume ratio of 30-50% as an extracting agent, and adjusting the pH of the slurry to 2-3; (2) by using sodium nitrate or lithium nitrate liquor as washing liquor, extracting to obtain lanthanum-containing raffinate and a praseodymium- and neodymium-containing organic phase; (3) carrying out countercurrent reverse extraction with sulfuric acid or / and nitric acid as a reverse extraction liquid to obtain a praseodymium and neodymium containing reverse extraction liquid; and (4) adding a rare earth precipitator into the lanthanum-containing raffinate, and roasting the precipitate to obtain lanthanum oxide. Meanwhile, the invention further discloses an extraction and separation method of rare earths in rare earth ore concentrates. One neutral extracting agent is used for extraction and separation of the rare earth ore concentrates, so that the economic pressure of production is relatively low without a transformation step of fully fishing and fully reversing. The neutral extracting agent is used, so that saponification is avoided, and thus the problem that discharge of ammonia-nitrogen wastewater does not reach the standard is eliminated from the source.

Description

technical field [0001] The invention belongs to the technical field of rare earth separation, and relates to a method for separating lanthanum from a rare earth nitrate feed solution and a method for separating rare earth concentrates. Specifically, the invention relates to a method for separating A method for lanthanum, more specifically, the present invention relates to a method for separating lanthanum from a rare earth nitrate liquid containing trivalent lanthanum, praseodymium and neodymium and a method for separating rare earth concentrate. Background technique [0002] Baotou rare earth mine is mainly composed of light rare earths, among which cerium accounts for about 50% of all rare earths. Other light rare earths lanthanum, praseodymium and neodymium account for about 50%, especially the content of lanthanum is nearly 26%. At present, the smelting method of Baotou rare earth mine is mainly high-temperature roasting of concentrated sulfuric acid. After the rare ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B59/00
CPCY02P10/20
Inventor 赵君梅刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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