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Method for preparing large-particle and flaky praseodymium neodymium oxide

A technology of praseodymium neodymium oxide and large particles, which is applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problem of high production cost, and achieve the effect of uniform particle distribution and good dispersion

Inactive Publication Date: 2012-06-20
INNER MONGOLIA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN200310118563.2 provides a method for preparing large-grained rare earth oxides by oxalic acid precipitation. Ammonium chloride is added to the rare earth chloride solution, and oxalic acid precipitation is used to prepare oxalic acid rare earth oxides, which are obtained after burning. Oxidation of rare earth; this method needs to add ammonium chloride, and use oxalic acid as a precipitant, the production cost is high

Method used

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  • Method for preparing large-particle and flaky praseodymium neodymium oxide

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Embodiment 1

[0011] Add 1000L praseodymium neodymium chloride solution with a concentration of 0.23mol / L in a 3000L reaction tank, heat the praseodymium neodymium chloride solution to 60°C, add 300L ammonium bicarbonate solution with a concentration of 2.5mol / L, and complete the precipitation reaction in 3 hours. Aging for 1 hour, washing, and filtering to obtain a precipitate of praseodymium neodymium carbonate, which was kept in a firing kiln at 1100°C for 4 hours to obtain a product of praseodymium neodymium oxide with a central particle size of 34.32 μm.

Embodiment 2

[0013] Add 1000L praseodymium neodymium chloride solution with a concentration of 0.35mol / L into the 3000L reaction tank, heat the praseodymium neodymium chloride solution to 60°C, add 450L ammonium bicarbonate solution with a concentration of 2.5mol / L, the precipitation reaction is completed in 3 hours, and keep warm Aging for 1 hour, washing, and filtering to obtain a precipitate of praseodymium-neodymium carbonate, which was kept in a firing kiln at 1100°C for 4 hours to obtain a product of praseodymium-neodymium oxide with a central particle size of 41.22 μm.

Embodiment 3

[0015] Add 1000L praseodymium neodymium chloride solution with a concentration of 0.18mol / L in a 3000L reaction tank, heat the praseodymium neodymium chloride solution to 60°C, add 240L ammonium bicarbonate solution with a concentration of 2.5mol / L, the precipitation reaction is completed in 3 hours, and keep warm Aging for 1 hour, washing, and filtering to obtain a precipitate of NdPr carbonate, which was kept in a firing kiln at 1100° C. for 4 hours to obtain a NdPr oxide product with a central particle size of 27.06 μm.

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Abstract

The invention relates to a method for preparing large-particle and flaky praseodymium neodymium oxide, and belongs to a material preparation technology. The method comprises the following steps of: preparing praseodymium neodymium carbonate by using a praseodymium neodymium chloride solution as a raw material and using ammonium hydrogen carbonate as a precipitating agent, washing, filtering, centrifugally drying and firing the praseodymium neodymium carbonate sediment, and thus obtaining the flaky praseodymium neodymium oxide product with the central particle size of 25 to 45 microns. The precipitation temperature and the concentration of the praseodymium neodymium carbonate are the key, the precipitation temperature is controlled to be 60 DEG C, and the concentration of the praseodymium neodymium chloride solution is controlled to be 0.15-0.5mol / L; the large-particle praseodymium neodymium oxide product of which the central particle size is 25 to 45 microns, is produced by using a conventional praseodymium neodymium carbonate precipitating procedure in a factory; and the product is uniform in particle distribution, good in dispersibility and flaky.

Description

technical field [0001] The invention relates to a method for preparing large-grained and flaky praseodymium-neodymium oxide, which belongs to a material preparation process. Background technique [0002] NdPrO is widely used in magnetic materials, glass, ceramics, catalysis, electronics and other fields, especially plays an important role in the application of NdPrO magnetic materials. With the development of science and technology, at present, the development of the application of praseodymium neodymium iron boron magnetic materials, especially in the preparation of praseodymium neodymium metal, the demand for large particles of praseodymium neodymium oxide has increased significantly, and the use of large particles of praseodymium neodymium oxide to prepare praseodymium neodymium metal avoids fine particles Volatile, improve the operating environment. CN200310118563.2 provides a method for preparing large-grained rare earth oxides by oxalic acid precipitation. Ammonium ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y40/00
Inventor 李慧琴张瑞祥郝先库刘海旺王士智
Owner INNER MONGOLIA UNIV OF SCI & TECH
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