Preparation method of sphere-like nano gamma-aluminum oxide

A kind of alumina, spherical technology, applied in chemical instruments and methods, nanotechnology, nanotechnology and other directions, can solve the problems of equipment and environmental hazards, increase equipment and environmental protection costs, complex preparation process, and meet the equipment requirements. , Easy to use in secondary processing, and the effect of a wide range of applications

Pending Publication Date: 2022-03-01
无锡云岭半导体科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the preparation process is complex
During the preparation process, a lot of highly corrosive, toxic, harmful and polluting waste gas or high-risk waste liquid is often produced, which is extremely harmful to equipment and the environment, and increases the cost of equipment and environmental protection

Method used

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  • Preparation method of sphere-like nano gamma-aluminum oxide
  • Preparation method of sphere-like nano gamma-aluminum oxide
  • Preparation method of sphere-like nano gamma-aluminum oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0042]Dissolve 10g of citric acid evenly in 90g of ultrapure water at 60°C, and keep stirring until the citric acid is completely dissolved to form a colorless transparent solution; then add 0.4g of polyethylene glycol and 0.2g of isopropanol, and stir to make it fully Dissolve; take 20g of high-purity boehmite powder, slowly add the boehmite powder while stirring the solution, and continue to stir the solution until all the boehmite is added, continue to stir and disperse evenly; put the obtained slurry Put it into a ball mill and mill it at a speed of 200r / min for 30min, pass the milled slurry through an 80-mesh filter sieve; then spray dry the slurry while stirring, control the spray drying temperature to 110°C, and the feed rate to 500ml / h , to obtain a dry mixture powder; then place the dried mixture powder in a corundum crucible, place the corundum crucible in a muffle furnace, set the heating rate as follows: room temperature to 700°C, the time is 240min, the holding tim...

Embodiment 3

[0046] Dissolve 10g of citric acid evenly in 30g of ultra-pure water at 40°C, and continue to stir until the citric acid is completely dissolved to form a colorless transparent solution; then add 0.2g of polyammonium methacrylate and 0.1g of oleic acid amine, and stir to make it Fully dissolve; take 20g of boehmite powder, slowly add the boehmite powder while stirring the solution, and continue to stir the solution until all the boehmite is added, continue to stir and disperse evenly; put the obtained slurry into Ball mill at a speed of 200r / min for 30min in a ball mill, pass the ball-milled slurry through an 80-mesh filter sieve; then place the slurry in an oven at 100°C and dry it while stirring, and dry the solid obtained after drying with agate Grinding and crushing to a powder with uniform fineness and no graininess to obtain a mixture powder; then place the dried mixture powder in a corundum crucible, put the corundum crucible in a muffle furnace, set the heating rate as:...

Embodiment 4

[0048] Dissolve 10g of glycine evenly in 100g of ultrapure water at 5°C, and keep stirring until the citric acid is completely dissolved to form a colorless transparent solution; then add 0.2g of polyammonium methacrylate and 0.1g of stearic acid, and stir to make it fully Dissolve; take 20g of boehmite powder, slowly add the boehmite powder while stirring the solution, and continue to stir the solution until all the boehmite is added, continue to stir and disperse evenly; put the obtained slurry into a ball mill In the process of ball milling at a speed of 200r / min for 30min, the milled slurry was passed through an 80-mesh filter sieve; then the slurry was spray-dried while stirring, the spray-drying temperature was controlled to be 100°C, and the feed rate was 500ml / h to obtain Dry the mixture powder; then put the dried mixture powder in the corundum crucible, put the corundum crucible in the muffle furnace, set the heating rate as: room temperature to 800°C, the time is 240m...

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Abstract

The invention discloses a preparation method of sphere-like nano gamma-aluminum oxide, which comprises the following steps: 1) taking ultrapure water for later use; 2) adding an organic or inorganic compound with low-temperature thermal decomposability into ultrapure water, dissolving, adding an additive, and stirring to obtain a solution; 3) slowly and gradually adding boehmite powder into the solution, and stirring to obtain a mixture; 4) putting the mixture into a ball mill for ball milling; 5) drying the ball-milled mixture to obtain dry solid particles; 6) crushing the dry solid particles to obtain dry powder; and calcining the dried powder to obtain the nano gamma-aluminum oxide. The preparation method has the advantages of simplicity, stability, few procedures, low requirements on equipment, few types of used raw materials, generation of tail gas easy to absorb and treat, and low production cost; the nano gamma-aluminum oxide produced by the method is spheroidic, has the particle size of 5-20nm, is uniform in particle size distribution, is concentrated in particle size distribution, and is easy to disperse; and the obtained powder is wide in application range.

Description

technical field [0001] The invention relates to the technical field of metal oxides, in particular to a method for preparing spherical nanometer gamma-alumina. Background technique [0002] When the particle size of the material reaches the nanometer level, it will have many excellent properties and characteristics, such as quantum size effect, quantum tunneling effect, surface effect, etc., especially the nanometer size material has the advantages of high specific surface area and easy processing. These properties make nanoscale materials have many special application prospects. Alumina is an inorganic substance with the chemical formula Al 2 o 3 , is a high hardness compound with a melting point of 2054°C and a boiling point of 2980°C. There are eleven crystal forms of alumina, and there are many isomorphous crystals. There are mainly three crystal forms, namely α-alumina, β-alumina and γ-alumina. Among them, γ-alumina is a porous solid material with large specific sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/441C01F7/444B82Y30/00B82Y40/00
CPCC01F7/444C01F7/441B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/32C01P2004/64
Inventor 罗冷韦家谋胡伟杨亮
Owner 无锡云岭半导体科技有限公司
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