Preparation method for nanoscale rare earth oxide powder

A rare earth oxide, nano-scale technology, applied in rare earth metal compounds, chemical instruments and methods, nanotechnology and other directions, can solve the problems of high equipment requirements, inability to large-scale production, poor process controllability, etc., and achieve uniform nano-powder. , with market competitiveness and high washing efficiency

Active Publication Date: 2015-12-09
SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] Precipitation method is the most common method for synthesizing nano-scale rare earth oxide powder by liquid-phase chemical reaction, which has the characteristics of low cost, simple process, and easy promotion to industrial production. The particle fineness and dispersibility of the powder, often adopt the method of adding organic dispersants and organic surfactants, but according to the long-term research and production of the applicant, the amount of organic dispersants and organic surfactants added in the precipitation method is large, The cost is high, and after adding an organic dispersant, the sediment particles are not easy to filter and wash, and there are negative problems such as the need for c

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  • Preparation method for nanoscale rare earth oxide powder
  • Preparation method for nanoscale rare earth oxide powder
  • Preparation method for nanoscale rare earth oxide powder

Examples

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Effect test

Embodiment 1

[0037] a. In the hydrochloric acid medium, prepare a feed solution with a cerium oxide content of 1mol / L, and add an inorganic dispersant with 1% cerium oxide weight in a stirred state; Prepared with 5 parts of aluminum chloride, 30 parts of sodium fluoride and 30 parts of sodium hydroxide;

[0038] b. Slowly heat up to 100°C while stirring, and add sodium carbonate with a molar concentration of 2mol / L as a precipitant to precipitate until the reaction is complete;

[0039] c. At the end of the precipitation reaction, add a grain growth inhibitor of 1% by weight of ceria in step a, and age for 0.5h; the inorganic grain growth inhibitor component is, in parts by weight, ammonium dihydrogen phosphate 13 20 parts of ammonia water are prepared;

[0040] d. Wash four times, and the clarification time during the washing process is less than 30 minutes. After washing, filter with a vacuum filter funnel, and dry the filtrate at 100-150°C to obtain a loose nano-powder precursor;

[0...

Embodiment 2

[0044] a. In the hydrochloric acid medium, prepare a feed liquid with a lanthanum oxide content of 1.5mol / L, and add an inorganic dispersant with 3% of the weight of lanthanum oxide under stirring; the inorganic dispersant component is polymerized chlorine It is prepared by 15 parts of aluminum chloride, 50 parts of sodium fluoride and 50 parts of sodium hydroxide;

[0045] b. Slowly heat up to 60°C while stirring, and add ammonium bicarbonate with a molar concentration of 3mol / L as a precipitant to precipitate until the reaction is complete;

[0046] c. At the end of the precipitation reaction, add a grain growth inhibitor of 2% by weight of lanthanum oxide in step a, and age for 0.6h; the inorganic grain growth inhibitor component is 30 parts by weight of ammonium dihydrogen phosphate , prepared from 85 parts of ammonia water;

[0047] d. Wash four times, and the clarification time during the washing process is less than 30 minutes. After washing, filter with a vacuum filte...

Embodiment 3

[0051] a. In the nitric acid medium, prepare a feed liquid with a cerium oxide content of 0.6mol / L, and add an inorganic dispersant with 4% cerium oxide weight in a stirring state; the inorganic dispersant component is in parts by weight, as Prepared by 10 parts of polyaluminium chloride, 40 parts of sodium fluoride and 40 parts of sodium hydroxide;

[0052] b. Slowly heat up to 80°C while stirring, and add ammonium carbonate with a molar concentration of 2mol / L as a precipitant to precipitate until the reaction is complete;

[0053] c. At the end of the precipitation reaction, add a grain growth inhibitor of 1% by weight of ceria in step a, and age for 0.4h; In parts by weight, it is prepared from 20 parts of ammonium dihydrogen phosphate and 40 parts of ammonia water;

[0054] d. Wash four times, and the clarification time during the washing process is less than 30 minutes. After washing, filter with a vacuum filter funnel, and dry the filtrate at 100-150°C to obtain a loos...

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Abstract

The invention relates to the field of rare earth materials, in particular to a preparation method for nanoscale rare earth oxide powder. The preparation method comprises the steps that a precipitation method is adopted, rare earth material liquid of a nitric acid system or a hydrochloric acid system is taken as raw materials, a precipitant is added, and precipitating, filtering, drying and calcining are performed to obtain the rare earth oxide powder. The preparation method is characterized in that an inorganic dispersant is added before the precipitant is added, and a crystal grain growth inhibitor is added after the precipitant is added. According to the preparation method, the prepared nanoscale rare earth oxide powder is small and uniform in grain, easy to clarify and wash and low in production cost and can be produced on a scale on the basis of the precipitation method on the condition that special equipment is not added, it can be seen that the grain size of the powder is below 70 nanometers through electronic microscopy scanning, and production use is met.

Description

technical field [0001] The invention relates to the field of rare earth materials, in particular to a preparation method of nanoscale rare earth oxide powder. Background technique [0002] Our country has an advantage in the world in terms of rare earth resources and production. Rare earth nanomaterials and their applications have become a hot spot at present. Rare earth non-nanometer materials do not have comprehensive excellent properties, and their application prospects are huge. Rare earth oxides have been widely used in various fields of functional materials as luminescent materials, magnetic materials, superconductors, high-performance ceramics, ultraviolet absorbers, and precision polishing materials. Ultrafine rare earth oxide powder is an important part of rare earth nanomaterials. Due to its special physical and chemical properties, ultrafine rare earth oxide powder will be a new material in the 21st century. [0003] So far, the research on the preparation proce...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y40/00
Inventor 吴仕伦朱光荣冯新瑞
Owner SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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