Preparation method of alumina

A technology of alumina and aluminum salt, which is applied in the preparation of aluminum hydroxide, etc., can solve the problems of high cost and complicated preparation process, and achieve the effects of low production cost, simple process and high specific surface area

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process of this method is complicated an

Method used

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  • Preparation method of alumina

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Experimental program
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Embodiment 1

[0023] Take industrial-grade aluminum hydroxide and sodium hydroxide powder, and prepare a concentration of 100 g Al 2 o 3 ·L -1 sodium metaaluminate solution. Take industrial-grade aluminum sulfate powder and prepare the concentration to be 40g·Al 2 o 3 ·L -1 aluminum sulfate solution. Dissolve 50g of polyethylene glycol 6000 in 2000ml of water, keep the temperature at 50°C, add the aluminum sulfate solution and sodium metaaluminate solution into the polyethylene glycol 6000 solution under stirring, and control the flow rate of the aluminum sulfate solution at 10ml / min, adjust the flow rate of the sodium metaaluminate solution to keep the pH value of the system at around 8. After 90 minutes of neutralization, raise the system temperature to 70°C and age for 2 hours. The slurry was suction filtered, the filter cake was beaten and washed with deionized water, and dried at 100°C to obtain pseudo-boehmite dry glue. The SEM image is shown in figure 1 , TEM image see fig...

Embodiment 2

[0025] Take industrial-grade aluminum hydroxide and sodium hydroxide powder, and prepare a concentration of 20 g Al 2 o 3 ·L -1 sodium metaaluminate solution. Take industrial-grade aluminum sulfate powder and prepare the concentration to be 80g·Al 2 o 3 ·L -1 aluminum sulfate solution. Dissolve 30g of polyethylene glycol 2000 in 2000ml of water, keep the temperature at 25°C, add aluminum sulfate solution and sodium metaaluminate solution into the polyethylene glycol 2000 solution in parallel while stirring, and control the flow rate of aluminum solution at 10ml / min, adjust the flow rate of the sodium metaaluminate solution to keep the pH value of the system at around 7. After 90 minutes of neutralization, raise the system temperature to 40°C and age for 8 hours. The slurry was suction filtered, and the filter cake was beaten and washed with deionized water, and dried at 100° C. to obtain pseudo-boehmite dry glue. Calcined at 500°C for 6 hours to obtain γ-Al 2 o 3 , ...

Embodiment 3

[0027] Take industrial-grade aluminum hydroxide and sodium hydroxide powder, and prepare a concentration of 150 g Al 2 o 3 ·L -1 sodium metaaluminate solution. Industrial grade aluminum sulfate powder, formulated to a concentration of 26g Al 2 o 3 ·L -1 aluminum sulfate solution. Dissolve 40g of polyethylene glycol 4000 in 2000ml of water, keep the temperature at 50°C, add the aluminum sulfate solution and sodium metaaluminate solution into the polyethylene glycol 4000 solution under stirring, and control the flow rate of the aluminum sulfate solution at 10ml / min, adjust the flow rate of sodium metaaluminate solution to keep the pH value of the system at around 6. After 90 minutes of neutralization, raise the system temperature to 90°C and age for 6 hours. The slurry was suction filtered, and the filter cake was beaten and washed with deionized water, and dried at 100° C. to obtain pseudo-boehmite dry glue. Calcined at 700°C for 2 hours to obtain γ-Al 2 o 3, γ-Al wa...

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Abstract

The invention discloses a preparation method of alumina. The method is as below: merging an aluminum salt solution and a precipitating agent, and adding the mixture into a water solution containing polyethylene glycol to conduct a co-precipitation reaction; aging, filtering and drying the obtained pseudo-boehmite dry glue; and roasting the pseudo-boehmite dry glue to obtain gamma-Al2O3 powder. The method has the advantages of simple process and low production cost; the prepared alumina has regular layered structure, less aggregation of powder particles, large pore volume, large aperture, high specific surface area and little pollution to environment, and is easy for realization of industrialized production.

Description

technical field [0001] The invention relates to a method for preparing alumina, in particular to a method for preparing alumina with a layered structure. Background technique [0002] Alumina materials are widely used in chemical industry, medicine, electronics, refractory materials, environmental protection and many other fields. In particular, alumina has broad application prospects in the fields of catalysis, separation, and multifunctional devices (nanoreactors, optical devices, bioseparation membranes, and chromatographic packings). These applications have special requirements for the morphology of alumina materials and require Alumina materials with uniform size and regular appearance (fiber, tube, layer, flake and sphere) were synthesized. [0003] CN200910196552.3 discloses a method for preparing flaky α-alumina particles by molten salt method. The method uses industrial grade sodium aluminate as the raw material to prepare the α-alumina precursor, and adopts the m...

Claims

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Application Information

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IPC IPC(8): C01F7/34
Inventor 姚运海丁莉周勇郭蓉杨成敏
Owner CHINA PETROLEUM & CHEM CORP
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