Method for fast preparation of olive-shaped lanthanum sodium tungstate

An olive-shaped sodium lanthanum tungstate and sodium tungstate technology, which is applied in chemical instruments and methods, tungsten compounds, nanotechnology for materials and surface science, etc., can solve the problems of unenvironmental protection, high reaction temperature and time-consuming production process. Long-term problems, to avoid the use of surfactants, simple process, easy to wash the effect

Active Publication Date: 2015-12-02
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method for rapidly preparing olive-shaped lanthanum tungstate sodium to overcome the high equipment requirements, high reaction temperature, long time-consuming, and slow production process required for the existing preparation of lanthanum tungstate. Defects such as environmental protection

Method used

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  • Method for fast preparation of olive-shaped lanthanum sodium tungstate
  • Method for fast preparation of olive-shaped lanthanum sodium tungstate
  • Method for fast preparation of olive-shaped lanthanum sodium tungstate

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Effect test

Embodiment 1

[0028] Using sodium tungstate and lanthanum nitrate as raw materials, and using sodium nitrate as an additive, it includes the following specific steps: (1) Preparation of solutions: prepare solution A and solution B respectively, solution A is a sodium tungstate solution with a concentration of 0.2mol / L, and the solution B is a mixture solution of lanthanum nitrate and sodium nitrate, wherein the concentration of lanthanum nitrate is 0.03mol / L, and the concentration of sodium nitrate is 8mol / L. The solvent used for preparing the solution is more suitable with deionized water, and distilled water is also available; (2) suspension Solution: under the condition of 5°C, quickly mix solution A and solution B according to the molar ratio of lanthanum nitrate and sodium tungstate 1:1.2 to prepare a suspension, adjust the pH of the system to 7 with sodium hydroxide and concentrated nitric acid, or use Ammonia and concentrated nitric acid to adjust the pH; (3) hydrothermal reaction: tr...

Embodiment 2

[0030] Using sodium tungstate and lanthanum nitrate as raw materials, and using sodium nitrate as an additive, it includes the following specific steps: (1) Preparation of solutions: prepare solution A and solution B respectively, solution A is a sodium tungstate solution with a concentration of 0.3mol / L, and the solution B is a mixture solution of lanthanum nitrate and sodium nitrate, wherein the concentration of lanthanum nitrate is 0.05mol / L, and the concentration of sodium nitrate is 12.5mol / L; (2) Suspension preparation: at 20°C, mix solution A and solution B Rapidly mix the lanthanum nitrate and sodium tungstate at a molar ratio of 1:1.5 to prepare a suspension, adjust the pH of the system to 8.5 with sodium hydroxide and concentrated nitric acid, or adjust the pH with ammonia water and concentrated nitric acid; (3) Hydrothermal reaction: Transfer the above suspension to a reaction kettle, react at 180°C for 12 hours, collect the resulting solid, wash with deionized water...

Embodiment 3

[0032]Using sodium tungstate and lanthanum nitrate as raw materials, and using sodium nitrate as an additive, it includes the following specific steps: (1) Preparation of solutions: prepare solution A and solution B respectively, solution A is sodium tungstate solution with a concentration of 0.4mol / L, solution B is a mixture solution of lanthanum nitrate and sodium nitrate, wherein the concentration of lanthanum nitrate is 0.07mol / L, and the concentration of sodium nitrate is 17mol / L; (2) Suspension preparation: under the condition of 35°C, prepare solution A and solution B according to The molar ratio of lanthanum nitrate and sodium tungstate is 1:1.8 and the suspension is quickly mixed, and the pH of the system is adjusted to 10 with sodium hydroxide and concentrated nitric acid, and the pH can also be adjusted with ammonia water and concentrated nitric acid; (3) Hydrothermal reaction: The above suspension was transferred to a reaction kettle and reacted at 200°C for 16 hour...

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Abstract

The invention relates to a method for fast preparation of olive-shaped lanthanum sodium tungstate and belongs to the field of the inorganic material and functional material processing preparation technology. The method utilizes a simple hydro-thermal technology, sodium tungstate and lanthanum nitrate as raw materials and sodium nitrate as an additive to prepare a lot of products in short time. The prepared lanthanum sodium tungstate with a thin sheet structure is self-assembled to form the olive-shaped structure with the average length of 4.5-5.5 microns and waist average width of 2.5-3.5 microns. The olive-shaped lanthanum sodium tungstate has the characteristics of high degree of crystallization, uniform sizes and good dispersibility. The method has simple processes and a low cost. The product can be cleaned easily, is suitable for automatic large-scale production and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of processing and preparation technology of inorganic materials and functional materials, and in particular relates to a method for rapidly preparing olive-shaped sodium lanthanum tungstate. Background technique [0002] As an important functional material, rare earth luminescent materials are widely used in the fields of display and lighting technology due to their advantages such as high conversion efficiency, stable physical and chemical properties, rich energy level structure and long fluorescence lifetime. Most of these materials are doped with rare earth ions in the luminescent center into a suitable matrix, and a rich photoluminescence spectrum can be obtained under the irradiation of near-ultraviolet light. With the enhancement of energy awareness, the low-carbon lighting of urban life has become the focus of attention. my country is a big producer of rare earth phosphors for traditional picture tube CRT and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B82Y30/00B82Y40/00
Inventor 丁益张奇才任启芳
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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