Nanometer zinc oxide, preparation method thereof and desulfurizing agent

Abstract

The invention discloses nano-zinc oxide, a preparation method thereof and a desulfurizing agent, and relates to the field of nano-zinc oxide preparation. The preparation method of the nano-zinc oxidecomprises the following steps: carrying out neutralization reaction on a zinc sulfate solution and a sodium carbonate solution in a supergravity reactor to generate precursor slurry; adjusting the precursor slurry to be neutral, standing and aging for at least 2.5 hours, washing and carrying out filter pressing to obtain a precursor; calcining the precursor; carrying out direct precipitation reaction by adopting a supergravity reactor; the generated basic zinc carbonate precursor is quickly nucleated in a supergravity reactor; the method comprises the following steps: calcining nano-zinc oxide, then aging, nucleating uniformly and finely, mainly condensing and growing among nuclei, so that the particle size of the nano-zinc oxide after subsequent calcination is uniform and fine, the specific surface area of the nano-zinc oxide after calcination is effectively increased compared with that of a direct precipitation method, and the penetration sulfur capacity of the desulfurizing agent can be up to 25% when the prepared nano-zinc oxide is applied to the desulfurizing agent.

Description

technical field [0001] The application relates to the field of nano-zinc oxide preparation, in particular, to a nano-zinc oxide, a preparation method thereof, and a desulfurizer. Background technique [0002] At present, active nano zinc oxide is widely used in desulfurizer, rubber, ceramics, medical treatment, photocatalysis, cosmetics, feed and other industries. Active nano-zinc oxide prepared by wet method has excellent surface activity and has become the main raw material of zinc oxide desulfurizer. [0003] At present, the active zinc oxide used in the zinc oxide desulfurizer is prepared by a wet process. For example, the existing preparation method of nano-zinc oxide directly precipitated in a reaction tank has serious agglomeration among precursor particles. After calcination, the particle size distribution of the product is wide, easy to agglomerate, and the specific surface area is reduced. However, the active nano-zinc oxide products on the market at this stage, ...

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Problems solved by technology

[0003] At present, the active zinc oxide used in the zinc oxide desulfurizer is prepared by a wet process. For example, the existing preparation method of nano-zinc oxide directly precipitated in a reaction tank has serious agglomeration among precursor particles. After calcination, the particle size distribution of the product is wide, easy to agglomerate, and the specific surface area is reduced

However, the active nano-zinc oxide products on the market at this stage, regardless of whether the zinc oxide content is more than 95% or more than 99%, have a specific surface area of ​​40-65m. 2 / g, rarely break through 65m 2 / g of active zinc oxide, and when it is used in zinc oxide desulfurizers, it can only meet the basic standard requirements of HG / T 2508-2012 zinc oxide desulfurizer standard of 20% of the breakthrough sulfur capacity at 220°C, and cannot Make a greater breakthrough in its penetration sulfur capacity, and some products are even difficult to make the penetration sulfur capacity of zinc oxide desulfurizer reach the requirement of 20%.

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