Process for preparing nano zinc oxide

A nano-zinc oxide and zinc sulfate technology, which is applied in the direction of zinc oxide/zinc hydroxide, nitrogen fertilizer, ammonium salt fertilizer, etc., can solve the problems of high cost and complicated reaction process, and achieve the effect of not easy to agglomerate, simple to operate, and easy to disperse

Inactive Publication Date: 2003-02-12
SHANDONG XIAOYA GRP CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

There are many methods for preparing nano-ZnO, but there are ...

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  • Process for preparing nano zinc oxide
  • Process for preparing nano zinc oxide

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Embodiment 1

[0019] The method of embodiment 1. nanometer ZnO, concrete steps are as follows: 1. be 30% zinc sulfate (ZnSO 4 ) solution, dripping the ammoniacal liquor that the weight percentage concentration is 20%, zinc sulfate and ammoniacal liquor (NH 3 ·H 2 O) The weight ratio is 1: 0.8. 2. Add ammonium bicarbonate, 1 part of Zn(OH) 2 Add 0.6 parts of NH 4 HCO 3 , to get ZnCO 3 ·Zn(OH) 2 precipitation. 3. The precipitate was separated and washed with deionized water until no SO was detected by barium chloride (BaCl) 4 2- until. 4. Then vacuum-dried at 85°C to obtain Zn(OH) 2 As the core, the periphery is covered with ZnCO 3 composite precursors. 5. Start calcining the above composite precursor at 150° C., gradually raise the temperature to 600° C., and complete the calcination for 2 hours to obtain nano-ZnO material. The product is white, hexagonal crystal, the average particle size is 20-30nm, the product quality is good, and it has good dispersion in water. The method o...

Embodiment 3

[0021] Select stearic acid as the surfactant, and the consumption is 1 part of zinc sulfate plus 2 parts (both parts by weight) of the surfactant. The method of embodiment 4. nanometer ZnO, step is as described in embodiment 1, difference is:

Embodiment 4

[0021] Select stearic acid as the surfactant, and the consumption is 1 part of zinc sulfate plus 2 parts (both parts by weight) of the surfactant. The method of embodiment 4. nanometer ZnO, step is as described in embodiment 1, difference is:

[0022] Zinc sulfate (ZnSO 4 ) solution weight percent concentration is 25%, and the weight percent concentration of dripping ammoniacal liquor is 18%, and zinc sulfate and ammoniacal liquor (NH 3 ·H 2 O) in a weight ratio of 1:1.

[0023] 1 part Zn(OH) 2 Add 0.8 parts of NH 4 HCO 3 .

[0024] Dry under vacuum at 90°C.

[0025] The calcining time is 2.5 hours, and the obtained nano-ZnO product is white, hexagonal crystal, and the average particle diameter is 25nm. It has good dispersibility in water. The method of embodiment 5.nano ZnO, step is as described in embodiment 1, difference is:

[0026] Zinc sulfate (ZnSO 4 ) solution weight percent concentration is 20%, the weight percent concentration of dripping ammoniacal liquor...

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Abstract

A process for preparing nanometre zinc oxide includes such steps as proportionally dropping ammonia water to a zinc sulfate solution, adding ammonium hydrogen carbonate to obtain ZnCO3.Zn(OH)2 deposit, separation, washing with deionized water, vacuum drying to obtain a composite presoma, and then calcining at 150-600 deg.C for 1.5-2.5 hr to obtain the product. Its advantages are low cost and high dispersity of product in water.

Description

(1) Technical field [0001] The invention relates to a preparation method of nano-zinc oxide, in particular to a method for preparing nano-zinc oxide by a precipitation conversion method. (2) Background technology [0002] Due to the small particle size and large specific surface area, nano-ZnO has surface effects, quantum size effects, and Kubo effects. Compared with ordinary ZnO, it exhibits many special properties, such as non-toxicity and non-migration, fluorescence, and piezoelectricity. Ability to absorb and scatter UV rays. This new state of matter endows ZnO, a traditional product, with many new uses in the field of science and technology, such as manufacturing gas sensors, phosphors, ultraviolet shielding materials, varistors, image recording materials, piezoelectric materials, varistors, magnetic materials, high-efficiency catalysts, etc. Utilizing the resistance change of ZnO, it can be made into alarms, hygroscopic ions, and conduction thermometers; using the ul...

Claims

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Application Information

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IPC IPC(8): C01G9/02C05C3/00
Inventor 祖庸卫志贤张松梅
Owner SHANDONG XIAOYA GRP CO LTD
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