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Alumina (γ-Al2O3) Microspheres
Release time：2019-10-09 17:04:36
Product use: catalyst, catalyst carrier, gas and liquid desiccant, gas purification adsorbent, drinking water defluoridation agent, industrial sewage color and odor eliminating agent.
Existing preparation techniques and problems: The existing alumina microsphere preparation process is as follows:
| raw material | Disadvantage | |
| 1、Spray drying | Mixture of alumina powder and aluminum sol | Uniform particle distribution, single product |
| 2、Rolling ball | Mixture of alumina powder and aluminum sol | Large particle size, single product |
| 3、Oil column forming |
a mixture of aluminum sol and gelling agent,
An organic amine is dissolved in the oil column as an auxiliary gelling agent.
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Severe energy consumption, ammonia corrosion equipment generated in the process, single product |
The present technology and features: The technology uses an industrial grade aluminum sol as an aluminum source, and uses a special curing agent (about 10 wt%) to prepare alumina microspheres using a microfluidic molding technique.
The technical features are:
Product microsphere size is uniform
High product packing density
Production can be adjusted flexibly
Can prepare a variety of microspheres from solid to hollow
Microsphere size can be adjusted between 50 microns and 2 mm by process parameters and microfluidic device channel size
Performance comparison between industrial alumina microspheres and alumina microspheres prepared by this process
| index | Industrial alumina microspheres | Alumina microspheres prepared by the present technology |
| Particle size mm | 0.5 ~ 10 | 0.05 ~ 10 |
| Kong Rong cm3/g | 0.35 ~ 0.4 | 0.4 ~ 0.7 |
| Aperture nm | ---- | 9 ~ 15 |
| Specific surface area m2/g | 150 ~ 300 | 160 ~ 180 |
| Bulk density g/cm3 | 0.5 ~ 0.7 | 0.9 ~ 0.95 |
| Hollow microsphere | Solid microsphere | |
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