Wet-method zinc oxide preparation method

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...

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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.

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