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Process for producing high-purity praseodymium neodymium oxide by using neodymium iron boron smelting slag

A technology of praseodymium neodymium oxide and neodymium iron boron, which is applied to the preparation/processing of rare earth metal oxides/hydroxides, lanthanide oxides/hydroxides, and rare earth metal compounds, and can solve the problems of high production costs, Problems such as low purity of praseodymium and neodymium oxide

Inactive Publication Date: 2021-10-15
BAOTOU RARE EARTH HUAXING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are many preparation methods for high-purity praseodymium and neodymium oxides in the prior art. After technical retrieval, an invention patent with the patent number CN200710050061.9 was found. The production process of extracting praseodymium and neodymium oxide, which uses oxalic acid as a precipitant, has high production costs, and does not have multiple filtration and washing, resulting in low purity of praseodymium and neodymium oxide

Method used

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  • Process for producing high-purity praseodymium neodymium oxide by using neodymium iron boron smelting slag

Examples

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Embodiment 1

[0025] This embodiment provides a process for producing high-purity praseodymium-neodymium oxides with NdFeB smelting slag. In terms of formula percentage, the process for producing high-purity praseodymium-Nd oxides with NdFeB smelting slag includes NdFeB smelting slag 80 -90 parts, 35-40 parts of hydrochloric acid, 80-90 parts of praseodymium and neodymium chloride solution, 55-60 parts of ammonium bicarbonate solution and 40-50 parts of distilled water;

[0026] Preferably, in terms of formula percentage, the process of producing high-purity NdFeB slag from NdFeB smelting slag includes 86 parts of NdFeB smelting slag, 37 parts of hydrochloric acid, 82 parts of praseodymium and neodymium chloride solution, and 57 parts of ammonium bicarbonate solution and 43 parts of distilled water.

Embodiment 2

[0028] This embodiment provides a process for producing high-purity NdPr oxides with NdFeB smelting slag, and the specific steps are as follows:

[0029] (1) Reaction treatment: place the NdFeB smelting slag inside the reaction kettle, add hydrochloric acid at the same time, stir for 20-30min, then precipitate for 4-5 hours, and obtain NdFeB precipitate after precipitation;

[0030] (2) Heating reaction: the NdFeB precipitate obtained in step (1) is heated and reacted through a reactor, the internal temperature of the reactor is 90-100°C, and the reaction time is 30-40min;

[0031] (3) Rinse and filter: wash the NdFeB precipitate with hot water for 1-3 times, and filter it through a filter screen after washing. The mesh number of the filter screen is 150-200 mesh, and the number of filters is 2-4 times;

[0032] (4) Reaction precipitation: Fill distilled water into the reactor, then add praseodymium neodymium chloride solution and ammonium bicarbonate solution in sequence, kee...

Embodiment 3

[0040] First place the NdFeB smelting slag inside the reactor, add hydrochloric acid at the same time, stir for 20 minutes, and then precipitate for 4 hours. After precipitation, the NdFeB precipitate is obtained. The temperature is 90°C, the reaction time is 30 minutes, the NdFeB precipitate is washed once with hot water, and then filtered through a filter screen with a mesh number of 150 mesh, and the number of filters is 2 times, and distilled water is filled into the reactor , followed by adding praseodymium neodymium chloride solution and ammonium bicarbonate solution, keeping the flow rate of praseodymium neodymium chloride solution at 0.4mL / min, after maintaining for 30min, adding the filtered NdFeB precipitate, precipitating for 40min, and the precipitate obtained by precipitating Washing with hot water, the number of times of washing is 2 times, the precipitate obtained after washing is burned, the burning temperature is 1000°C, and the praseodymium neodymium oxide is ...

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Abstract

The invention provides a process for producing high-purity praseodymium neodymium oxide by using neodymium iron boron smelting slag, the method comprises the following steps: taking 86 parts of neodymium iron boron smelting slag, 37 parts of hydrochloric acid, 82 parts of praseodymium neodymium chloride solution, 57 parts of ammonium bicarbonate solution and 43 parts of distilled water as raw materials, carrying out a series of process steps such as reaction treatment, heating reaction, showering and filtering, reaction precipitation, washing and firing and the like, sequentially adding a praseodymium neodymium chloride solution and an ammonium bicarbonate solution, keeping the flow rate of the praseodymium neodymium chloride solution at 0.6 mL / min for 35 minutes, then adding the filtered neodymium iron boron precipitate, precipitating for 45 minutes, washing the precipitate obtained by precipitation with hot water for three times, and firing the precipitate obtained by washing at the firing temperature of 1080 DEG C to obtain the praseodymium neodymium oxide. The neodymium iron boron smelting slag is used for producing the praseodymium neodymium oxide, the praseodymium neodymium oxide can be purified through distilled water reactive distillation and multiple times of filtering and washing, oxalic acid is not used as a precipitator, and the production cost of the praseodymium neodymium oxide is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of praseodymium-neodymium alloys, in particular to the technical field of a process for producing high-purity praseodymium-neodymium oxides from smelting slag of neodymium-iron-boron. [0002] technical background [0003] The appearance of praseodymium and neodymium oxide is gray or brown powder, which is easy to absorb water and gas, and must be stored in a dry place, not in the open air, for deep processing and glass, ceramics, magnetic materials, etc. [0004] Praseodymium neodymium oxide is an important raw material for the preparation of permanent magnet materials. The preparation process of praseodymium neodymium oxide mainly includes oxalic acid precipitation and ammonium bicarbonate precipitation followed by burning, but the production cost of praseodymium neodymium oxide prepared by oxalic acid precipitation is relatively high. The process of preparing praseodymium and neodymium oxide by ammonium pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/224C01F17/10
CPCC01F17/224C01F17/10C01P2006/80Y02P20/10
Inventor 鲁强张俊清曾杰孟凡宇赵圆月
Owner BAOTOU RARE EARTH HUAXING TECH CO LTD
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