Method for preparing nano zinc oxide

A nano-sized, zinc oxide technology, applied in chemical instruments and methods, zinc oxide/zinc hydroxide, chemical methods of reacting liquids with liquids, etc., can solve the problems of wide grain size distribution, difficult to control, etc. The effect of easy control of conditions and uniform particle size distribution

Inactive Publication Date: 2003-05-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using low-cost inorganic salts as raw materials, the co-precipitation reaction of zinc salt and alkali solution is carried out by using a liquid-liquid two-phase co-precipitation reaction full-return mixed liquid membrane reactor, so as to solve the problem of simultaneous nucleation and crystallization in the prior art. Occurrence, wide grain size distribution and difficult to control problems, prepare basic zinc carbonate with nanometer size and uniform particle size distribution, and then obtain zinc oxide with nanometer size and uniform particle size after roasting

Method used

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  • Method for preparing nano zinc oxide
  • Method for preparing nano zinc oxide
  • Method for preparing nano zinc oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step A: 0.12mol (34.5g) of solid ZnSO 4 ·7H 2 O dissolved in 120ml of H 2 In O; In addition, the solid NaOH of 0.15mol (6.0g) and the solid NaOH of 0.06mol (6.4g) 2 CO 3 Dissolve in 120ml of water.

[0027] Step B: Add 80ml of deionized water into a fully back-mixed liquid membrane reactor with a volume of 1L, adjust the gap of the reactor to 10 microns, start the reactor, and control the rotor speed at about 6000rpm. Add the zinc salt solution and the alkali solution into the reactor at the same time, and the reaction mixture stays in the reactor for 2 minutes.

[0028] Step C: Pour the synthetic reaction material flowing out of the reactor in step B into a 500ml crystallization kettle, and crystallize at room temperature for 0.7h under stirring conditions.

[0029] Step D: The crystallized substance is filtered, washed and dried to obtain basic zinc carbonate.

[0030] Step E: Calcining basic zinc carbonate in a high-temperature furnace at 500°C to obtain zinc o...

Embodiment 2

[0033] Step A: 0.012mol (3.57g) of solid ZnNO 3 ·6H 2 O dissolved in 120ml of H 2 In O; another 25% NH 3 ·H 2 O 2ml and 0.024mol (2.3g) of solid [NH 4 ] 2 CO 3 Dissolve in 120ml of water.

[0034] Step B: Add 80ml of deionized water into a fully back-mixed liquid membrane reactor with a volume of 1L, adjust the gap of the reactor to 20 microns, start the reactor, and control the flow rate of the rotor at about 3000rpm. Add the zinc salt solution and the alkali solution into the reactor at the same time, and the reaction mixture stays in the reactor for 10 minutes.

[0035] Step C: Pour the synthetic reaction material flowing out of the reactor in Step B into a 500ml crystallization kettle, and crystallize at 5°C for 1 hour.

[0036] Step D: The crystallized substance is filtered, washed and dried to obtain basic zinc carbonate.

[0037] Step E: Calcining basic zinc carbonate at 300°C in a high-temperature furnace to obtain zinc oxide.

[0038] It can be seen from the...

Embodiment 3

[0040] Step A: 0.36mol (103.5g) of solid ZnSO 4 ·7H 2 O dissolved in 120ml of H 2 In O; another 0.43mol (17.2g) of solid NaOH and 0.24mol (19.0g) of solid NH 4 HCO 3 Dissolve in 120ml of water.

[0041] Step B: Add 80ml of deionized water into a fully back-mixed liquid membrane reactor with a volume of 1L, adjust the gap of the reactor to 1 micron, start the reactor, and control the flow rate of the rotor at about 1000rpm. Add zinc salt solution and alkali solution into the reactor at the same time, and the reaction mixture stays in the reactor for 20 minutes.

[0042] Step C: Pour the synthetic reaction material flowing out of the reactor in Step B into a 500ml crystallization kettle, and crystallize at 50°C for 0.5h.

[0043] Step D: The crystallized substance is filtered, washed and dried to obtain basic zinc carbonate.

[0044] Step E: Calcining basic zinc carbonate in a high-temperature furnace at 400°C to obtain zinc oxide.

[0045] The transmission electron micro...

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Abstract

A process for preparing nano-size zinc oxide includes such steps as co-deposition reaction of zine salt on alkali solution in the reactor with liquid mixing membrane to obtain nano-size alkaline zinc carbonate, and calcining. Its advantages are nano size and high uniformity of granularity.

Description

Technical field: [0001] The invention relates to a preparation method of nano-sized zinc oxide. Background technique: [0002] Nano zinc oxide is a new type of high-function fine inorganic product facing the 21st century. 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. 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. It can be used as a sunscreen and antibacterial agent in cosmetics, shielding ultraviolet rays, antibacterial and deodorizing. In the textile industry, it can be added to various fibers to manufacture surgical gowns and bandages used by hospitals and long-term bedridden patients. Antibacterial, disinfection, deodorization Odor; it can be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J14/00C01G9/00C01G9/02
Inventor 段雪赵芸张慧何静李峰
Owner BEIJING UNIV OF CHEM TECH
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