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Production process of low-impurity praseodymium-neodymium carbonate

A technology of praseodymium neodymium carbonate and production process, which is applied in the production process field of low impurity praseodymium neodymium carbonate, can solve the problems of low purity and affect the purity of praseodymium neodymium oxide, and achieves the effects of improving purity, rapid precipitation and crystallization, and improving efficiency.

Inactive Publication Date: 2019-07-12
赣州天和永磁材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation of praseodymium neodymium oxide by burning is generally obtained by burning high-purity praseodymium neodymium carbonate. In the existing process for preparing praseodymium neodymium carbonate, the purity of the produced neodymium carbonate product is relatively low, thereby affecting the purity of praseodymium neodymium oxide. Therefore, it is necessary to improve the production process of praseodymium and neodymium carbonate

Method used

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Embodiment 1

[0026] A kind of production technique of low impurity praseodymium neodymium carbonate is provided in embodiment 1,

[0027] It is prepared from praseodymium neodymium chloride and ammonium bicarbonate according to the volume ratio of 30:30, the concentration of ammonium bicarbonate is 95g / L, and the mass concentration of praseodymium neodymium chloride is 0.45mol / L; according to the following steps:

[0028] S1: Place the neodymium praseodymium chloride in the reaction tank, control the pH to 0.5, and blow CO 2 , the CO 2 The volume ratio with praseodymium neodymium chloride is 5:1, and the filter residue is removed by filtration;

[0029] S2: add the hydrochloric acid solution of pH=1 in the reaction tank, the volume ratio of described praseodymium neodymium chloride and hydrochloric acid is 4:1, after fully stirring, filter and remove filter residue;

[0030] S3: slowly add ammonium bicarbonate to the reaction tank, while adding ammonium bicarbonate, the liquid in the rea...

Embodiment 2

[0035] A kind of production technique of low impurity praseodymium neodymium carbonate is provided in embodiment 2,

[0036] It is prepared from praseodymium neodymium chloride and ammonium bicarbonate in a volume ratio of 30:40, the concentration of ammonium bicarbonate is 100g / L, and the mass concentration of praseodymium neodymium chloride is 0.50mol / L; according to the following steps:

[0037] S1: place praseodymium neodymium chloride in the reaction tank, control pH to 1, blow CO 2 , the CO 2 The volume ratio with praseodymium neodymium chloride is 5:1, and the filter residue is removed by filtration;

[0038] S2: add the hydrochloric acid solution of pH=1 in the reaction tank, the volume ratio of described praseodymium neodymium chloride and hydrochloric acid is 4:1, after fully stirring, filter and remove filter residue;

[0039] S3: slowly add ammonium bicarbonate to the reaction tank, while adding ammonium bicarbonate, the liquid in the reaction tank is stirred at ...

Embodiment 3

[0044] A kind of production technique of low impurity praseodymium neodymium carbonate is provided in embodiment 3,

[0045] It is prepared from praseodymium neodymium chloride and ammonium bicarbonate according to the volume ratio of 30:43, the concentration of ammonium bicarbonate is 105g / L, and the mass concentration of praseodymium neodymium chloride is 0.55mol / L; according to the following steps:

[0046] S1: place praseodymium neodymium chloride in the reaction tank, control the pH to 1.5, blow in CO 2 , the CO 2 The volume ratio with praseodymium neodymium chloride is 5:1, and the filter residue is removed by filtration;

[0047] S2: add the hydrochloric acid solution of pH=1 in the reaction tank, the volume ratio of described praseodymium neodymium chloride and hydrochloric acid is 5:1, after fully stirring, filter and remove filter residue;

[0048] S3: slowly add ammonium bicarbonate to the reaction tank, while adding ammonium bicarbonate, the liquid in the reactio...

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Abstract

The invention discloses a production process of low-impurity praseodymium-neodymium carbonate and belongs to the technical field of rare earth extraction. According to the production process disclosedby the invention, by controlling the conditions such as feeding ratio and feed liquid concentration of neodymium praseodymium chloride and ammonium bicarbonate, as well as temperature and pH value inthe reaction process, the generation efficiency of neodymium carbonate through reaction of the neodymium praseodymium chloride and the ammonium bicarbonate is greatly improved; the generation of praseodymium-neodymium carbonate double salt is avoided, crystalline neodymium carbonate with small mass fraction of chlorine root and the purity of 99.9 percent or above is obtained, rapid precipitationcrystallization is achieved, and the purity of the praseodymium-neodymium carbonate is improved.

Description

technical field [0001] The invention relates to the technical field of rare earth extraction, in particular to a production process of low impurity neodymium praseodymium carbonate. Background technique [0002] As an important raw material of NdFeB permanent magnet material - praseodymium neodymium metal, its production process mainly adopts the method of fluoride system oxide electrolysis, and its raw material is praseodymium neodymium oxide (a mixture of praseodymium oxide and neodymium oxide), and the The preparation process mainly includes oxalic acid precipitation and ammonium bicarbonate precipitation followed by burning. However, the production cost of praseodymium neodymium oxide prepared by oxalic acid precipitation is relatively high, and the preparation of praseodymium neodymium oxide by ammonium bicarbonate precipitation has become the current development trend. There are many manufacturers that provide raw materials for rare earth metal companies, and the ammo...

Claims

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Application Information

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IPC IPC(8): C01F17/00
CPCC01P2006/80C01F17/247
Inventor 舒金澄金秀贤
Owner 赣州天和永磁材料有限公司
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