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Preparation method of spherical bayerite powder with by-production of ammonium nitrate

A technology of ammonium nitrate and aluminum stone powder, which is applied in the direction of ammonium nitrate, chemical instruments and methods, alumina/aluminum hydroxide, etc., can solve the problems of difficult storage, unstable chemical properties of ammonium nitrate, and difficult preparation, and achieve The effect of small powder particle size, high sphericity and narrow particle size distribution

Inactive Publication Date: 2016-08-10
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, ammonium nitrate is unstable in chemical properties, difficult to prepare, and difficult to store

Method used

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  • Preparation method of spherical bayerite powder with by-production of ammonium nitrate
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  • Preparation method of spherical bayerite powder with by-production of ammonium nitrate

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Experimental program
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Effect test

Embodiment 1

[0029] 100ml of aluminum nitrate solution with a concentration of 0.05mol / L, magnetically stirred, while controlling the temperature at 35°C, adding aluminum nitrate solution dropwise with 20% ammonia water, flocculent precipitation appeared in the reactor, when the pH value of the reaction solution reached At 9.5 o'clock, stop dripping ammonia water, place the reactor in ultrasonic waves, and after ultrasonic vibration for 30 minutes, the reaction liquid becomes a suspension, and the suspension is washed with water and suction filtered several times, and the filtrate is spray-dried to obtain by-product ammonium nitrate, filter cake Diluted with distilled water and ultrasonically oscillated for 20 minutes to become a suspended aqueous solution, and the suspended aqueous solution was spray-dried to obtain spherical bayalite powder (see attached figure 1 ).

Embodiment 2

[0031] 100ml of aluminum nitrate solution with a concentration of 0.45mol / L, magnetically stirred, while controlling the temperature at 35°C, dripping aluminum nitrate solution with a concentration of 20% ammonia water, flocculent precipitation appeared in the reactor, when the pH value of the reaction solution reached At 9.5 o'clock, stop dripping ammonia water, place the reactor in ultrasonic waves, and after ultrasonic vibration for 30 minutes, the reaction liquid becomes a suspension, and the suspension is washed with water and suction filtered several times, and the filtrate is spray-dried to obtain the by-product ammonium nitrate, filter cake Diluted with distilled water and ultrasonically oscillated for 20 minutes to become a suspended aqueous solution, and the suspended aqueous solution was spray-dried to obtain spherical bayalite powder (see attached figure 2 ).

Embodiment 3

[0033] 100ml of aluminum nitrate solution with a concentration of 0.05mol / L was stirred magnetically, while the temperature was controlled at 45°C, and the aluminum nitrate solution was added dropwise with 20% ammonia water, and flocculent precipitation appeared in the reactor. When the pH value of the reaction solution reached At 9.5 o'clock, stop dripping ammonia water, place the reactor in ultrasonic waves, and after ultrasonic vibration for 30 minutes, the reaction liquid becomes a suspension, and the suspension is washed with water and suction filtered several times, and the filtrate is spray-dried to obtain the by-product ammonium nitrate, filter cake Diluted with distilled water and ultrasonically oscillated for 20 minutes to become a suspended aqueous solution, and the suspended aqueous solution was spray-dried to obtain spherical bayalite powder (see attached image 3 ).

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Abstract

The invention aims to provide a preparation method of spherical bayerite powder with by-production of ammonium nitrate. The preparation method is simple in process, has low cost and can prepare micro-scape high-spherical-ratio bayerite powder and meanwhile obtain a by-product ammonium nitrate. In the technical scheme, the preparation method includes the steps of: 1) preparing an aluminum nitrate solution and an ammonia water solution in certain concentration; 2) adding the aluminum nitrate solution to a reactor, performing magnetic stirring, and when a preset reaction temperature is reached, adding the ammonia water dropwisely to the aluminum nitrate solution to generate flocculent precipitate in the reactor; 3) when the pH value of the reaction liquid reaches a specified value, stopping adding the ammonia water dropwisely, placing the reactor in ultrasonic wave to perform ultrasonic vibration for a certain time to form a suspension liquid; and 4) water-washing and suction-filtering the suspension liquid for several times, spray-drying a filtrate to obtain the by-product ammonium nitrate, diluting filter cake in distilled water and performing ultrasonic vibration to form a suspension water solution, and spray-drying the suspension water solution to prepare the spherical bayerite powder.

Description

technical field [0001] The invention belongs to the field of ultrafine powder preparation, in particular to a method for preparing spherical bayalite powder by-product ammonium nitrate. Background technique [0002] Baalite powder is an important precursor for preparing α-alumina powder. α-alumina powder can be used as a general-purpose heat-conducting gap material to be added to materials such as plastics, silicone sheets, epoxy resins, and polyurethanes to improve the thermal conductivity of the material, because the spherical powder has a high filling percentage, which can improve the thermal conductivity of the material. Therefore, spherical α-alumina powder is favored among thermally conductive fillers. In order to obtain spherical α-alumina powder, the spherical precursor must first be obtained. Among the numerous precursors of alumina, bayonet powder has a memory effect, that is, it can retain the shape during the process of calcination to form α-alumina. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/18C01F7/02
CPCC01C1/185C01F7/02C01P2002/72C01P2004/61
Inventor 赵文凯刘红宇朱静
Owner SHENYANG POLYTECHNIC UNIV
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