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1. Various sedimentation method
The precipitation process in homogeneous solutions is a crystal nuclear reaction. After that, the aggregation becomes greater and eventually from the solution from solution, it is usually unbalanced. But, if you lower the concentration of precipitant in homogeneous, even slowly Generation, then large numbers of microcrystals nuclei will be evenly produced. Finally, finely precipitated particle are uniformly distributed in the entire solution and a balanced state can be maintained for a long period of time. Method for average prediction. Al2 (SO4)3, Al (NO3) 3 & urea are used as raw materials. Under the conditions of an oil bath 98°C, the hydroxide produced by slow hydrolysis of Urea is precipitant. After calcination, the size and shape of the precursor particles can be altered by adjusting the proportion of SO422- to NO3-. Al2 (SO4) 3. The obtained colloid particles have a very good shape. This method was used in Al2(SO4) 3 and Urea as raw materials. The spherical (and hollow spherical) alumina powders were prepared under different conditions. A homogeneous precipitation process is possible if the precipitated particles obtained fall within the range for colloid particles. In addition to the conditions of SO42 – present, it is often difficult to finally form a glue of the globiosis in the gelation of sol particles to finally form a globiotype, so people think that this formation of sol-emulsion-condensation Gladle.
2. Sol-emulsion-gel method
This method is based on the sol-gel method. To obtain spherical powder particles from the oil phase, one uses the interface tension of both the oil and the water phases to form small spherical droplets. Aluminum hydrolysis produced the spheroidized powder of alumina. The aluminum hydrolysis process used acetonitrile as a solvent and the octanol (dissolved aluminum) accounted to 50%. The butanol and octanol from dispersed waters accounted respectively for 9% & 1%. Using hydroxypropylcellulose as a dispersant to obtain a spherical g-alumina powder having a very good spherical degree.
3. Drip method
The droplet method is used for binding the alumina sol to the oil layer (usually using petroleum oil, paraffin or mineral oil). The resulting spherical sol particle is then gelled in an alkaline ammonia solution. This is used to improve the sol-emulsion gel method.
4. Use templates
The template method controls the morphology during the production of spherical foodstock. The product is often hollow or has a nuclear-shell structure. The aluminum powder surface is used for simplifying the aluminum powder’s surface. While the template method can be used to prepare an air spherical ball sphere, it has limitations. The preparation steps are more involved and require more effort.
5. Gas solve decomposition method
The aerosol decomposition process is usually based upon an aluminum salt. It uses the properties of aluminum alcohol and high-temperaturepyrolysis to make aluminum salt. Next, it uses phase transition to alkoxide gasify, then contact with watervapor. Finally, the high temperature dry or direct high temperatures are picked. This allows for a gas-liquid solid or gas-solid phase transition and forms a spherical powder of alumina. This method is based on complex experimental devices, which include atomizing moiety or reaction moieties.
6. Radio frequency induction plasma method
Radio frequency plasma treatment of alumina dust using radio frequency radiation. This plasma has high energy density and high heating power. It also allows for simple processing of material. The powder is free from any electrodes and therefore not contaminated by electrode evaporation. It is possible for purity to be maintained. Additionally, the plasma torch is heated rapidly and irregularly shaped particles of alumina are sprayed by the feed gas into the plasma torch. Droplets will quickly solidify, creating spherical particle.
The essence and structure of spinal alumina are formed quickly by surface tension. You can divide it into spray heat, spray drying, and spray melting Law, depending on the characteristics of phase transformation. AlCl3, Al2 SO4) 3, Al (NO3) 3 solution form small droplets through atomization. The process also requires a high thermal decomposition temperature of around 900°C. The aluminum salt solution is first mixed with ammonia to form an alkali sol. After that, the spherical product is sprayable at 150 to 240 deg C.
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