Method and device for preparing nano zinc oxide

A nano-zinc oxide and zinc oxide technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of non-continuous production, uneven particle size distribution, low efficiency, etc.

Inactive Publication Date: 2011-01-26
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 es

Method used

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  • Method and device for preparing nano zinc oxide
  • Method and device for preparing nano zinc oxide
  • Method and device for preparing nano zinc oxide

Examples

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Effect test

Embodiment 1

[0026] Put the configured zinc-ammonia complex solution into the storage tank 11, the mass fraction of zinc accounts for 5% of the total mass of the solution, turn on the frequency converter, steam, and circulation pump, and control the speed of the rotating packed bed by adjusting the respective parameters. The steam flow rate is 200r / min, the steam flow rate is 10kg / h, and the liquid flow rate is 400L / h. The packing of the rotating packed bed is stainless steel plate. The temperature of the steam is controlled by adjusting the pressure. The temperature is 120°C. The liquid reacts to generate a basic zinc carbonate mixture with a deamination rate of 95% and a zinc precipitation rate of 98%; then it is roasted in a muffle furnace at a controlled temperature of 350°C for 3 hours, and its average particle size is 80nm.

Embodiment 2

[0028] Put the configured zinc-ammonia complex solution into the storage tank 11, the mass fraction of zinc accounts for 20% of the total mass of the solution, turn on the frequency converter, steam and circulation pump, and control the speed of the rotating packed bed by adjusting the respective parameters The steam flow rate is 800r / min, the steam flow rate is 80kg / h, and the liquid flow rate is 40L / h. The packing of the rotating packed bed is stainless steel plate. The temperature of the steam is controlled by adjusting the pressure. The temperature is 160°C. The liquid reacts to generate a basic zinc carbonate mixture with a deamination rate of 98% and a zinc precipitation rate of 99.9%; then it is roasted in a muffle furnace at a controlled temperature of 450°C for 6 hours, and its average particle size is 21nm.

Embodiment 3

[0030] Put the configured zinc-ammonia complex solution into the storage tank 11, the mass fraction of zinc accounts for 10% of the total mass of the solution, turn on the frequency converter, steam and circulation pump, and control the speed of the rotating packed bed by adjusting the respective parameters The steam flow rate is 2800r / min, the steam flow rate is 50kg / h, and the liquid flow rate is 80L / h. The packing of the rotating packed bed is stainless steel plate. The temperature of the steam is controlled by adjusting the pressure. The temperature is 140°C. The liquid reacts to generate a basic zinc carbonate mixture with a deamination rate of 96% and a zinc precipitation rate of 99.8%; then it is roasted in a muffle furnace at a controlled temperature of 550°C for 4 hours, and its average particle size is 35nm.

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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...

Claims

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Application Information

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IPC IPC(8): C01G9/02
Inventor 刘有智焦纬洲祁贵生袁志国申红艳
Owner ZHONGBEI UNIV
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