Purification method for anhydrous aluminum chloride, and gas-phase nano-alumina preparation device and method therefor

A gas-phase nano-alumina preparation device, comprising a conveying and processing mechanism, a sublimator, a gas heating mechanism, a cyclone separation mechanism, a reactor, a deacidification furnace, and a magnetic iron removal mechanism;

• wherein, the conveying and processing mechanism is configured to pulverize and convey aluminum chloride raw material;
• the sublimator has a feed inlet, a first air inlet, and a first air outlet;
• the conveying and processing mechanism is connected to the feed inlet of the sublimator and is configured to introduce the pulverized aluminum chloride powder into the sublimator, while the gas heating mechanism is connected to the first air inlet and is configured to introduce the heated gas into the sublimator to heat the aluminum chloride powder;
• the cyclone separation mechanism has a second air inlet and a second air outlet, wherein the second air inlet is connected to the first air outlet, and the second air outlet is sequentially connected to the reactor, the deacidification furnace, and the magnetic iron removal mechanism.

A preparation method for gas-phase nano-alumina, comprising the following steps:

• pulverizing raw material for the aluminum chloride reaction by a conveying and processing mechanism and then conveying into a sublimator;
• heating air in a heating mechanism, and then conveying the hot air into the sublimator;
• the hot air heats the aluminum chloride powder to produce aluminum chloride sublimation gas, the temperature inside the sublimator is maintained 250° C. to 350° C., and the temperature of the hot air is 250° C. to 500° C.;
• introducing the aluminum chloride sublimation gas into a cyclone separation mechanism for cyclone separation to obtain aluminum chloride gas, the temperature inside the cyclone separation mechanism is maintained 200° C. to 300° C.;
• introducing the obtained aluminum chloride gas into a reactor to react and generate nano-alumina;
• introducing the nano-alumina into a deacidification furnace for deacidification;
• and
• introducing the deacidified nano-alumina into a magnetic iron removal mechanism for magnetic iron removal, then obtaining nano-alumina.