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Preparation method for high dispersion nano lanthanum hydroxide

A technology of lanthanum hydroxide and high dispersion, applied in the field of nanomaterials, can solve the problems of serious agglomeration of nanometer lanthanum hydroxide particles, serious agglomeration of lanthanum hydroxide particles, irregular particle morphology, etc., so as to shorten the production cycle and improve the production. Efficiency, uniform particle size distribution effect

Active Publication Date: 2019-12-13
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Lanthanum hydroxide grains with high purity and small particle size can be prepared by this method, but the defects of this method are: the agglomeration of the prepared lanthanum hydroxide particles is relatively serious, the preparation process is relatively complicated, and the energy consumption is high
The method adopts the liquid phase precipitation method, and regulates the size of nano-lanthanum hydroxide particles by controlling the amount of ammonia water. The disadvantage of this method is that the nano-lanthanum hydroxide particles obtained by this process are seriously agglomerated, and the particle morphology is irregular. The range of regulation by the amount of ammonia water is relatively narrow

Method used

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  • Preparation method for high dispersion nano lanthanum hydroxide
  • Preparation method for high dispersion nano lanthanum hydroxide
  • Preparation method for high dispersion nano lanthanum hydroxide

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preparation example Construction

[0057] A kind of preparation method of highly dispersed nanometer lanthanum hydroxide of the present invention, comprises the steps:

[0058] 1) dissolving the lanthanum salt in water, an organic solvent or a mixture of water and an organic solvent to obtain a lanthanum salt solution; dissolving an alkali in water, an organic solvent or a mixture of water and an organic solvent to obtain a lye;

[0059] 2) adding lanthanum salt solution and lye into a common reactor or a high-gravity rotating packed bed for precipitation and crystallization reaction to prepare lanthanum hydroxide suspension;

[0060] 3) putting the lanthanum hydroxide suspension into an incubator for aging treatment;

[0061] 4) adding a modifier to the aged slurry for modification;

[0062] 5) cooling the modified slurry to normal temperature, and washing by ultrafiltration or centrifugation to obtain a filter cake;

[0063] 6) Dispersing the filter cake into a liquid medium to obtain a highly dispersed nan...

Embodiment 1

[0090] A preparation method for highly dispersed nanometer lanthanum hydroxide, comprising the steps of:

[0091] 1) Dissolve 0.74g of lanthanum nitrate hexahydrate in 50mL of deionized water, and sonicate for 0.2h; dissolve 0.24g of sodium hydroxide in 50mL of deionized water, and sonicate for 0.2h;

[0092] 2) After adjusting the temperature of the lanthanum nitrate hexahydrate solution and the sodium hydroxide solution to 16°C, they were passed into the baffled high-gravity rotary bed reactor through a peristaltic pump at a feed flow rate of 100mL / min, and the rotary bed speed was 1500rpm. Obtain lanthanum hydroxide suspension;

[0093] 3) Place the obtained lanthanum hydroxide suspension in an incubator at a constant temperature, adjust the temperature to 16° C., and age for 3 hours;

[0094] 4) Add Tween to the aged slurry for modification, the amount of modifier is 5wt%, the water bath temperature is 70°C during modification, and the modification time is 1h;

[0095] 5...

Embodiment 2

[0110] A preparation method for highly dispersed nanometer lanthanum hydroxide, comprising the steps of:

[0111] 1) Dissolve 0.74g of lanthanum chloride heptahydrate in 50mL of deionized water and sonicate for 0.2h; dissolve 0.24g of sodium hydroxide in 50mL of deionized water and sonicate for 0.2h;

[0112] 2) After adjusting the temperature of the lanthanum chloride heptahydrate solution and the sodium hydroxide solution to 16°C, they were fed into the high-gravity rotating bed through a peristaltic pump at a feed rate of 100mL / min, and the rotating bed speed was 1500rpm to obtain lanthanum hydroxide suspension;

[0113] 3) Place the obtained lanthanum hydroxide suspension in an incubator at a constant temperature, adjust the temperature to 16° C., and age for 3 hours;

[0114] 4) Add Tween to the aged slurry for modification, the amount of modifier is 5wt%, the water bath temperature is 70°C during modification, and the modification time is 1h;

[0115] 5) cooling the mo...

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Abstract

The invention discloses a preparation method for high dispersion nano lanthanum hydroxide. The preparation method comprises the following steps of dissolving lanthanum salt in water, organic solventsor mixtures of the water and the organic solvents to obtain lanthanum salt solutions; dissolving alkali in water, organic solvents or mixtures of the water and the organic solvents to obtain alkali liquor; adding the lanthanum salt solutions and the alkali liquor into a common reactor or a super-gravity rotating packed bed for precipitating crystallization reaction to obtain lanthanum hydroxide suspensions; placing the lanthanum hydroxide suspensions into a thermostat for aging treatment; adding the serous fluid after aging treatment to modifiers for modification; cooling the modified serous fluid to normal temperature, and ultra-filtering or centrifugally washing the serous fluid to obtain filter cakes; and dispersing the filter cakes into liquid media to obtain high dispersion nano lanthanum hydroxide liquid, or drying the filter cakes to obtain high dispersion nano lanthanum hydroxide powder. According to the method, the one-dimensional size of prepared lanthanum hydroxide particlesis 15-250 nm, and the particles are not agglomerated but dispersed for no less than 6 months.

Description

technical field [0001] The invention relates to the technical field of nanometer materials. More specifically, it relates to a preparation method of highly dispersed nanometer lanthanum hydroxide. Background technique [0002] Lanthanum Hydroxide La(OH) 3 With excellent optical, electrical and magnetic properties, it can be widely used as catalysts, adsorbents, fluorescent agents, time-resolved fluorescence (TRF) biolabels, and up-conversion luminescent materials. Nanostructured materials exhibit many properties superior to their bulk counterparts due to quantum size effects. Nanostructured lanthanum hydroxide has a relatively large specific surface area, which can fully contact with the reaction materials and greatly improve its catalytic activity. [0003] The preparation methods of highly dispersed nano-lanthanum hydroxide include precipitation method, thermal decomposition method, hydrothermal method, solvothermal method, sol-gel method, and different methods show dif...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y40/00
CPCB82Y40/00C01P2002/72C01P2002/82C01P2004/04C01P2004/16C01P2004/62C01P2004/64
Inventor 王洁欣谢瑜陈博曾晓飞陈建峰
Owner BEIJING UNIV OF CHEM TECH
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