Drying machine and method for nano zinc oxide production

Abstract

The invention discloses a drying machine and method for nano zinc oxide production. The drying machine comprises a drying box, a screening device, a grinding assembly, a dehumidification device and a drainage purification device, the interior of the drying box is divided into an upper-layer storage chamber, a middle-layer first-stage drying chamber, a lower-layer second-stage drying chamber and a purification chamber through horizontal partition plates; the dehumidification device is installed in the storage chamber, a screening and shaking device is arranged in the first-stage drying chamber, a roasting and decomposing assembly is installed in the second-stage drying chamber, a drainage and purification device is arranged in the purification chamber, and the grinding assembly is installed in the screening and shaking device; and the interior of a grinding cavity where the grinding assembly is located and the interior of the roasting and decomposing assembly are inflated and dehumidified through the dehumidification device, and air penetrates through the interior of the grinding assembly and the interior of the roasting and decomposing assembly to flow into the drainage and purification device.

Description

technical field [0001] The invention relates to the technical field of nano-zinc oxide preparation, in particular to a dryer and a method for producing nano-zinc oxide. Background technique [0002] Nano-zinc oxide is a multifunctional new inorganic material, and its particle size is about 1-100 nanometers. Due to the miniaturization of crystal grains, the surface electronic structure and crystal structure change, resulting in surface effects, volume effects, quantum size effects and macroscopic tunnel effects that macroscopic objects do not have, as well as high transparency and high dispersion. In recent years, it has been found that it exhibits many special functions in catalysis, optics, magnetism, mechanics, etc., making it have important application value in many fields such as ceramics, chemical industry, electronics, optics, biology, and medicine. Nano-zinc oxide can be used in the fields of textiles and coatings for ultraviolet light shielding materials, antibacter...

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Problems solved by technology

The degree of dryness in nano-zinc oxide affects the quality of its preparation. Among them, for the nano-scale ultra-fine active zinc oxide prepared by wet chemical method, the zinc-containing material is purified by acid leaching to remove impurities for many times, and the precipitation obtains the basic formula. Zinc carbonate (Zn 2 (OH) 2 CO 3 ), and finally obtain nano-zinc oxide after roasting, but the existing drying process for it is relatively simple, and it is directly heated and dried, resulting in uneven heating and incomplete roasting and drying, resulting in lower quality of the prepared nano-zinc oxide. Difference

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