Method and device for preparing nano zinc oxide

Abstract

The invention belongs to the technical field of zinc oxide preparation, in particular to a method and a device for preparing nano zinc oxide so as to realize a continuous process which has the advantages of higher deamination and zinc deposition rate under low energy consumption and preparation of higher quality nano zinc oxide. The preparation method comprises the following steps of: performing reaction on a zinc-ammonia complex and hot steam in a rotary packed bed to generate a zinc oxide precursor; and baking to prepare the nano zinc oxide. The device comprises a steam kettle, a zinc-ammonia complex solution storage tank, the rotary packed bed and a product storage tank, wherein the zinc-ammonia complex solution storage tank is connected with the liquid inlet of the rotary packed bed; the steam kettle is connected with a buffer tank; the gas outlet of the buffer tank is connected with the gas inlet of the rotary packed bed; and the liquid outlet of the rotary packed bed is connected with the product storage tank. The method has the advantages of simple process operation, low cost, high efficiency, and continuity; and the device has the advantages of obvious transmission effect, low power consumption, small equipment volume, self-cleaning function, and low possibility of scale formation and blockage.

Description

technical field [0001] The invention belongs to the technical field of zinc oxide preparation, and in particular relates to a preparation method and device of nano zinc oxide. Background technique [0002] Nano-zinc oxide is a new type of high-functional fine inorganic product. Due to the miniaturization of particle size, the specific surface area increases sharply, which makes nano-zinc oxide produce surface effects, small size effects and macroscopic quantum tunneling effects that its bulk materials do not have. Wait. Therefore, nano zinc oxide has special properties and new uses that cannot be compared with general zinc oxide products in terms of magnetism, light, electricity, and sensitivity. Using the UV shielding ability of nano-zinc oxide, it can be made into UV filters and cosmetic sunscreens; using the resistance change of zinc oxide, it can be made into alarms, moisture-absorbing ions, and conduction thermometers; using the photosensitive theory of zinc oxide semi...

AI Technical Summary

Problems solved by technology

From the perspective of industrialization, the problems that still need to be solved in the preparation of nano zinc oxide are: (1) uneven particle size distribution; (2) poor product repeatability; (3) engineering difficulties, etc.

At present, the problems existing in this process are: (1) the NH in the solution complex 3 (2) The ammonia distillation process is a phase change process from liquid phase to solid phase, and the establishment of a continuous generation process is the key to the process; (3) In the prior art, under the condition of small processing capacity Using boilers to distill ammonia, this method has low efficiency, high energy consumption, continuous production, and unstable product quality, resulting in uneven particle size of zinc oxide produced, seriously affecting its quality, and it is difficult to form industrialized production

Images