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Method for reducing cerium content in praseodymium neodymium chloride and preparation method of praseodymium neodymium oxide

A technology of praseodymium and neodymium chloride, which is applied in the preparation/processing of rare earth metal compounds, rare earth metal oxides/hydroxides, etc., can solve problems such as affecting product quality and difficult-to-wash section separation.

Pending Publication Date: 2022-03-11
淄博包钢灵芝稀土高科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among them, trivalent cerium ions in the organic phase solution of praseodymium and neodymium chloride can be reduced and removed through the water phase washing step, calcium and iron ions can be reduced and removed through the precipitation process to control the precipitation pH, and sodium ions can be reduced and removed through the precipitation washing step , and only tetravalent cerium ions are preferentially extracted into the organic phase like praseodymium and neodymium ions during the extraction process, and it is difficult to separate them from praseodymium and neodymium in the washing section, which leads to Cerium is often greater than 500ppm, exceeding the standard, which greatly affects product quality

Method used

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  • Method for reducing cerium content in praseodymium neodymium chloride and preparation method of praseodymium neodymium oxide
  • Method for reducing cerium content in praseodymium neodymium chloride and preparation method of praseodymium neodymium oxide
  • Method for reducing cerium content in praseodymium neodymium chloride and preparation method of praseodymium neodymium oxide

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preparation example Construction

[0025] In the present invention, the preparation method of said neodymium praseodymium neodymium chloride organic phase solution preferably comprises the following steps:

[0026] The raw material liquid of praseodymium neodymium chloride and the organic phase extraction agent are subjected to multistage countercurrent extraction to obtain the organic phase solution of neodymium praseodymium neodymium chloride.

[0027] The present invention has no special requirements on the source of the praseodymium and neodymium chloride raw material solution.

[0028] The present invention has no special requirements on the type and source of the organic phase extractant.

[0029] In a specific embodiment of the present invention, the number of stages of the multi-stage countercurrent extraction is preferably 57 stages. During the multistage countercurrent extraction, during each stage of countercurrent extraction, the flow rate ratio of the rare earth chloride feed liquid containing pra...

Embodiment 1

[0054] A multi-stage countercurrent continuous extraction machine with three outlets is adopted, including 57 stages of countercurrent extraction. The organic extract phase is fed from the first stage, and the rare earth chloride material liquid containing praseodymium and neodymium is fed from the 57th stage. Praseodymium and neodymium chloride The aqueous solution (aqueous phase washing solution) and ascorbic acid are fed from the 84th stage, and the 85th stage obtains the purified praseodymium neodymium chloride organic phase solution.

[0055] Wherein, the flow velocity of the rare earth chloride material liquid containing praseodymium element and neodymium element is 18L / min, the flow velocity of organic phase extractant is 1.5L / min, and the flow velocity of praseodymium neodymium chloride aqueous solution (aqueous phase washing liquid) is 1.5L / min. min, during the 84th grade of washing, 5% ascorbic acid aqueous solution is added dropwise to the mixed solution of the prase...

Embodiment 2～14

[0059] The methods of Examples 2-14 are basically the same as those of Example 1, and the specific implementation parameters and results are shown in Table 1.

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Abstract

The invention relates to the technical field of praseodymium neodymium oxide preparation, in particular to a method for reducing the content of cerium in praseodymium neodymium chloride and a preparation method of praseodymium neodymium oxide. The method provided by the invention comprises the following steps: carrying out multi-stage countercurrent washing on a praseodymium neodymium chloride organic phase solution and a water phase washing solution, and adding ascorbic acid during at least one stage of the multi-stage countercurrent washing. The purified praseodymium neodymium chloride organic phase solution prepared by the method provided by the invention is low in Ce ion content, so that praseodymium neodymium oxide obtained after the purified praseodymium neodymium chloride organic phase solution is sequentially subjected to multi-stage countercurrent back extraction, precipitation and roasting is low in Ce ion content.

Description

technical field [0001] The invention relates to the technical field of praseodymium-neodymium oxide preparation, in particular to a method for reducing cerium content in praseodymium-neodymium chloride and a preparation method of praseodymium-neodymium oxide. Background technique [0002] With its unique electronic structure and special properties, rare earth is widely used in agriculture, industry, military and other industries. It is an important support for the manufacture of new materials and a key resource for the development of cutting-edge defense technologies. It is called "universal soil". . Praseodymium neodymium oxide (praseodymium neodymium oxide) is used as a raw material for the production of praseodymium neodymium rare earth alloys, and its purity affects the quality of praseodymium neodymium rare earth alloys. [0003] And praseodymium neodymium chloride is used as the raw material for the production of praseodymium neodymium oxide, and its purity greatly af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/241C01F17/17C01F17/10
CPCC01F17/241C01F17/17C01F17/10C01P2006/80
Inventor 饶向东李炳伟南胜刚高云龙孙继锋
Owner 淄博包钢灵芝稀土高科技股份有限公司
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