Wet-method zinc oxide preparation method

A zinc oxide, wet process technology, applied in the field of compound preparation, can solve the problems of difficult to clean, can only reach 95~99% in general, limited raw materials, etc., and achieves the effects of wide application, reduced production cost and wide application field.

Inactive Publication Date: 2013-05-08
金章法
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  • Abstract
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  • Claims
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Problems solved by technology

However, because the leaching solution is a zinc-ammonia complex solution, many other metal ions will also form relatively stable complex ions with ammonia, which is difficult to remove when removing impurities, so the product purity can generally only reach 95-99% ( GB / T19589-2004)
Moreover, in the calcination process, since the basic zinc carbonate is calcined, when the basic zinc carbonate decomposes to zinc oxide, a large amount of carbon dioxide will inevitably be produced, which has great restrictions on the raw materials used.

Method used

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preparation example Construction

[0030] The invention provides a kind of preparation method of zinc oxide, and concrete scheme is as follows:

[0031] a) Acid leaching, displacement reaction, oxidation reaction, and salting out are carried out on the mixed oxide containing zinc to obtain salting out solution and zinc salt;

[0032] b) thermally decomposing the zinc salt to obtain zinc oxide;

[0033] c) Prepare the mother liquor by preparing other products except zinc oxide obtained after thermal decomposition in step b) and the salted-out solution obtained in step a), and repeat the operation of step a).

[0034] The method provided by the invention is based on the traditional acid method for preparing zinc oxide, catalyzing salting out of anhydrous or monohydrate zinc sulfate, and then thermally decomposing to obtain zinc oxide with higher purity. The specific method is as follows:

[0035] First, the mixed oxide containing zinc element is subjected to acid leaching, that is, directionally dissolved. The ...

Embodiment 1

[0054] Orientation leaching 200g of mixed oxides containing 80wt% zinc oxide in 800mL of 25% dilute sulfuric acid aqueous solution to obtain a metal sulfate mixture, and then vacuum filtering the obtained product to obtain leaching residue and leaching solution, leaching To remove the slag, add excess zinc powder to the leaching solution, replace other metal ions in the leaching solution with metal simple substances, and then perform vacuum filtration to obtain the replacement slag and replacement liquid, remove the replacement slag, and pass through the replacement liquid Excessive ozone, under the reaction of ozone and water, oxidizes low-valent metal ions to obtain MeOOH precipitates, and then performs vacuum filtration to remove the MeOOH precipitates to obtain an oxidized solution. Adjust the zinc ions in the oxidizing solution to saturation, and then add concentrated sulfuric acid with a concentration of 98wt% to the saturated zinc sulfate solution to precipitate zinc sul...

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Abstract

The invention provides a wet-method zinc oxide preparation method comprising the steps that: (1) a mixed oxide comprising zinc element is subjected to acid leaching, a substitution reaction, an oxidation reaction, and salting-out, such that a salting-out solution and zinc salt are obtained; (b) the zinc salt is subjected to thermal decomposition, such that zinc oxide is obtained; and (c) other product obtained by thermal decomposition in the step (b) except zinc oxide are prepared into a mother liquor with the salting-out solution obtained by the salting-out process in the step (a), and the operation of the step (a) is repeated. With the method provided by the invention, the zinc oxide purity is high, and circular preparation can be realized. No neutralization agent is needed, such that cost is reduced, and a process is simple.

Description

technical field [0001] The invention relates to the field of compound preparation, in particular to a preparation method of zinc oxide. Background technique [0002] Zinc oxide (ZnO), commonly known as zinc white, is an oxide of zinc. Insoluble in water, soluble in acid and strong alkali. Zinc oxide is a commonly used chemical additive, widely used in the production of plastics, silicate products, synthetic rubber, lubricants, paint coatings, ointments, adhesives, food, batteries, flame retardants and other products. Zinc oxide has a large energy band gap and exciton binding energy, high transparency, and excellent room temperature light-emitting performance. It is used in liquid crystal displays, thin-film transistors, and light-emitting diodes in the semiconductor field. In addition, microparticles of zinc oxide, as a nanomaterial, have also begun to play a role in related fields. [0003] At present, the most commonly used preparation methods of zinc oxide are wet meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
Inventor 金章法
Owner 金章法
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