Prepn process of pseudoboehmite for luminescent material

A pseudo-boehmite, luminescent material technology, applied in luminescent materials, chemical instruments and methods, aluminum compounds, etc., can solve the problem of high cost

Inactive Publication Date: 2007-06-06
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

For example, sodium aluminate, also known as sodium metaaluminate, is often used to prepare pseudo-boehmite, whether it is industrial pure or high-purity grade, there is a problem of Fe or Na impurities; the use of aluminum isopropoxide as a raw material is expensive; Pseudo-boehmite prepared by acid method using aluminum sulfate as raw material has the problem of removing sulfate radicals

Method used

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  • Prepn process of pseudoboehmite for luminescent material

Examples

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preparation example Construction

[0015] The preparation of said aluminum gel is to add dropwise the concentration of NH 0.5mol / L in the Fe solution under the condition of mechanical stirring. 4 OH solution, until the Fe-removing solution turns into a transparent sol, the gel forming temperature is 50-90°C, and it is carried out in a water bath; then the obtained sol is left to age for 6-12 hours, and turns into an aluminum gel.

[0016] Said drying means drying the aluminum gel in an oven at a temperature of 110°C-120°C for 24-72 hours until it reaches a constant weight.

[0017] The following examples are to further illustrate the process characteristics of the present invention without limiting the present invention.

example 1

[0019] Weigh 100 grams of Al(OH) 3 Put it into a beaker and dissolve it with a 50% nitric acid solution to control Al(OH) 3 : HNO 3 Mass ratio=1:2, mechanically stirred at room temperature for 3 hours to obtain an acidic aluminum salt solution; continue to stir, and add dropwise a concentration of 0.5mol / L NH 4 HCO 3 Aqueous solution until pH = 7, to obtain a suspension; the suspension is vacuum filtered, the filter residue is discarded, and the Fe-removing solution is obtained; the Fe-removing solution is transferred to a constant temperature water bath, and the temperature is controlled at 50°C. AlOOH seed crystals with a purity of 99% and a particle size of about 50nm were added to the 2 o 3，氢氧化铝 : Al 2 o 3，拟薄水铝石 : = 1: 0.05 meter; continue to stir, and dropwise add NH with a concentration of 0.5mol / L 4 OH solution until the purified solution turns into a transparent sol; the obtained sol is left to stand for 6 hours, and then turns into an aluminum gel, which is dri...

example 2

[0021] Weigh 100 grams of Al(OH) 3 Put it into a beaker and dissolve it with a 50% nitric acid solution to control Al(OH) 3 : HNO 3 Mass ratio=1:3, mechanically stirred at room temperature for 4 hours to obtain an acidic aluminum salt solution; continue to stir, and add dropwise a concentration of 0.5mol / L NH 4 HCO 3 Aqueous solution, until pH = 8, to obtain a suspension; the suspension is vacuum filtered, the filter residue is discarded, and the Fe-removing liquid is obtained; the Fe-removing liquid is transferred to a constant temperature water bath, and the temperature is controlled at 70 ° C. AlOOH seed crystals with a purity of 99% and a particle size of about 50nm were added to the 2 o 3，氢氧化铝 : Al 2 o 3，拟薄水铝石 : = 1: 0.08 meter; continue to stir, and dropwise add NH with a concentration of 0.5mol / L 4 OH solution until the purified solution turns into a transparent sol; the obtained sol is left to stand for 8 hours, and then turns into an aluminum gel, which is drie...

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Abstract

The present invention provides preparation process of pseudoboehmite for luminescent material, and belongs to the field of chemical material preparing technology. The preparation process includes dissolving Al(OH)3 as material in HNO3, neutralizing the solution and eliminating Fe with alkali solution, adding nanometer AlOOH crystal seed, adding NH4OH solution to form sol, ageing and stoving to obtain pseudoboehmite powder. The preparation process can raise the crystallinity of pseudoboehmite and has no impurity introduced, and the product may be used as aluminum-containing luminescent material.

Description

【Technical field】 [0001] The invention relates to a method for preparing pseudo-boehmite for luminescent materials. It belongs to the technical field of material chemical preparation. 【Background technique】 [0002] There are many types of rare earth-doped luminescent materials containing an aluminum matrix, and they are widely used, and the quality requirements for the aluminum source raw materials for preparing luminescent materials are also very high. Pseudo-boehmite raw materials have superior nanoparticle properties, and are gradually being used as starting materials for sol-gel technology. [0003] When ordinary pseudo-boehmite is used to prepare luminescent materials, one of the disadvantages is that the content of Fe is relatively high. For example, special pseudo-boehmite has been produced industrially, containing Fe 2 o 3 Around 0.03%. Fe element is a quencher in luminescent materials, which damages the luminescent performance and reduces the luminous brightne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00C09K11/64
Inventor 王达健
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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