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Method for preparing nano-zinc oxide by using zinc-containing waste

A nano-zinc oxide and scrap technology, applied in the direction of zinc oxide/zinc hydroxide, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high purity requirements of raw materials, similar production methods, and high production costs , to achieve the effect of good dispersion, uniform particle size and good dispersion

Inactive Publication Date: 2017-12-22
河北长力环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difference between the direct precipitation method and the uniform precipitation method is that the precipitant used is different and the reaction principle is different, but the overall production method is similar. The advantage of this process is that the product has high purity, stable chemical properties, and is suitable for industrial production. The purity requirements of raw materials are high, and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] 1. Take the four raw materials of flue ash, zinc slag, zinc particles, and zinc-containing tailings, and weigh them according to the mass ratio of 1:1:2:3. The total zinc content is 15-18%, and the four raw materials are respectively Sieve out the raw materials below 5mm, the flue ash generally meets the requirements of sieving, the filtered zinc slag, zinc particles, and zinc-containing tailings are mixed and coarsely ground, and the zinc slag and zinc particles are ground to ≤3mm particles greater than 80% , the zinc-containing tailings are ground until the particle size of ≤1mm is greater than 80%, and the sieved raw materials are mixed to obtain zinc-containing waste.

[0072] 2. Evenly stir and mix the zinc-containing waste through the feeding drum, and send it into the acid leaching tank, the concentration of sulfuric acid is 10%, and the leaching time is 90 minutes. The zinc in the raw material is leached to produce a zinc sulfate solution. At this time, the zinc ...

Embodiment 2

[0079] According to the method of Example 1, using zinc-containing scraps with a total zinc content of 40-45%, replacing the calcination temperature with 120° C., to prepare nano-zinc oxide.

[0080] The purity of the nano-zinc oxide prepared in this embodiment is 99.8%, and the specific surface area is 80m 2 / g, the sedimentation rate is 80%, and the nano-zinc oxide whose particle size distribution reaches ≤60nm can reach 71%.

Embodiment 3

[0082] According to the method of Example 1, using zinc-containing waste materials with a total zinc content of 19-24%, replacing the calcination temperature with 320° C., to prepare nano-zinc oxide.

[0083] The purity of the nano-zinc oxide prepared in this embodiment is 99.6%, and the specific surface area is 78m 2 / g, the sedimentation rate is 77%, and the nano-zinc oxide whose particle size distribution reaches ≤60nm can reach 60%.

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Abstract

The invention provides a method for preparing nano-zinc oxide by using zinc-containing waste. The method comprises the following steps: by taking the zinc-containing waste difficult to be developed and utilized in the prior art and the zinc-containing waste of the traditional technology as raw materials, controlling the zinc content and the grain size of the zinc-containing waste within proper scope; fully dissolving the zinc in the zinc-containing waste in the manner of acid leaching; respectively removing different impurities and metals through grading replacement reaction, thereby guaranteeing the purity of the zinc-containing solution; fully precipitating the zinc through grading oxidizing reaction; pelletizing and drying, thereby achieving the optimal pyrolysis physical form; and calcining, thereby acquiring high-purity nano-zinc oxide. An experimental result proves that the method provided by the invention takes the zinc-containing waste as the raw material, the cost is low and the purity of the prepared nano-zinc oxide is 99.50-99.99%.

Description

technical field [0001] The invention relates to the technical field of metal material recycling, in particular to a method for preparing nanometer zinc oxide from zinc-containing waste materials. Background technique [0002] Nano zinc oxide is a high-tech material. Compared with ordinary zinc oxide, its particle size is small and its specific surface area is large. It shows excellent physical and chemical properties in chemistry, biology, optics and electricity. It is widely used in industrial fields. . At present, the production process of nano-zinc oxide is mainly divided into three categories: solid-phase chemical reaction method, gas-phase method and liquid-phase method. [0003] The solid-phase chemical reaction method is widely used in the synthesis of new complexes, metal clusters, etc. The principle of preparing nano-zinc oxide by solid-phase method is to grind zinc nitrate hexahydrate and an active agent (which can be sodium oxalate or sodium cyanide), and then c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G9/02C01P2004/52C01P2004/64C01P2006/22C01P2006/80
Inventor 李国强
Owner 河北长力环保科技有限公司
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