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Water column forming method of spherical aluminum oxide

A technology of spherical alumina and molding method, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of poor adaptability of raw materials, uneven strength distribution, large loss of pore volume, etc., and achieve enhanced adaptability, high purity, and strength distribution. concentrated effect

Active Publication Date: 2014-06-18
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of the method described in the technical background, such as large loss of pore volume, uneven distribution of strength, high sodium content, poor adaptability of raw materials, etc., and to provide a water column forming method for preparing spherical alumina after wet heat and chemical pore expansion. , and the spherical alumina prepared by this method

Method used

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  • Water column forming method of spherical aluminum oxide
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Effect test

Embodiment 1

[0022] Prepare spherical alumina by the method step of the present invention:

[0023] ① Ingredients: 100g of pseudo-boehmite, added to 500g of ammonium alginate solution with a mass fraction of 0.75%, fully stirred to form ammonium alginate-pseudo-boehmite suspension;

[0024] ② Forming: Drop the ammonium alginate-pseudoboehmite suspension into the liquid column of 0.3mol / L calcium nitrate solution, and the droplets will gel to form calcium alginate-pseudo-thin diaspore composite gel pellets, then take out the gel pellets and wash with deionized water for 3 to 4 times;

[0025] ③Acid treatment: Soak the gel pellets in 0.15mol / L nitric acid solution for 15 minutes, then take them out;

[0026] ④Humid heat treatment: react for 4 hours in a heat preservation and humidity box with a temperature of 75°C and a relative humidity of 82%;

[0027] ⑤Chemical pore expansion: Soak the pellets after wet heat treatment with 0.18mol / L urea solution in a water bath at 35°C for 10 minutes; ...

Embodiment 2

[0030] Prepare gamma-A by the step in embodiment 1 2 o 3 The difference is that 1200g of ammonium alginate solution with a mass fraction of 0.75% is used for the ingredients. The physical properties and impurity content of the prepared samples are shown in Table 1.

Embodiment 3

[0032] Prepare gamma-A by the step in embodiment 1 2 o 3 The difference is that the pellets are treated with 0.5mol / L acetic acid solution. The physical properties and impurity content of the prepared samples are shown in Table 1.

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Abstract

The invention relates to a water-column forming method of spherical aluminum oxide. The water-column forming method is characterized by comprising the following steps: (1) preparing pseudo-boehmite and a soluble alginate water solution into suspended slurry, and dropwise adding the suspended slurry into a polyvalent metal cation water solution, so as to form pseudo-boehmite-alginic acid gel beads; (2) carrying out acid treatment, heat-moisture treatment and chemical chambering treatment on the gel beads; and (3) finally drying and baking, so as to prepare the spherical aluminum oxide. The water-column forming method has the advantages that the cost is low, the operational steps are simple and feasible, the industrial production is easy to implement, and the prepared spherical aluminum oxide has the advantages of large pore volume and aperture, high strength, concentration in distribution and the like.

Description

technical field [0001] The invention relates to a water column forming method for spherical alumina, in particular to a water column forming method for preparing spherical alumina by utilizing the sol-gel property of soluble alginate to assist forming. technical background [0002] The preparation of spherical alumina by water column molding method is a novel preparation method of spherical alumina. Compared with the traditional rolling ball method and oil-in-oil molding method, this molding method has the advantages of fast molding speed, high efficiency, and no dust in the preparation process. , and the water system is used for molding at room temperature, which is a low-cost, low-energy, green and environmentally friendly preparation method for spherical alumina. [0003] The application number CN201210219122.0 discloses a method for preparing spherical alumina by an alginic acid-assisted molding method. In this method, pseudo-boehmite is used as a raw material, and sodiu...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 杨文建于海斌孙彦民李晓云孟广莹李世鹏曾贤君隋云乐周鹏谢献娜
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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