System for producing zinc oxide

Abstract

The present invention relates to a system for producing zinc oxide, comprising: a zinc melting unit for melting zinc to produce molten zinc; a zinc evaporation pipe for receiving the molten zinc from the zinc melting unit and generating zinc vapor; a zinc vapor supply line for supplying the zinc vapor discharged from the zinc evaporation pipe; an air transport line for providing an air flow path by the blowing force of a blower and having an interior to which the zinc vapor is supplied by the zinc vapor supply line, wherein the air transport line enables the zinc oxides generated by the reaction between the oxygen contained in the air and zinc vapor to be discharged together with the air; and a heating unit installed in the air transport line to heat the air to be mixed with the zinc vapor. The system for producing zinc oxide is installed in the air transport line in such a manner that a portion or the whole of the zinc melting unit, the zinc evaporation pipe and the zinc vapor supply line uses the heat contained in the air in the air transport line or the heat of the reaction caused by the generation of zinc oxide when melting or evaporating the zinc. The system of the present invention utilizes the heat recovered from the heated air and the reaction heat generated during the production of zinc oxide.

Description

technical field [0001] The present invention relates to a zinc oxide preparation system, in more detail, relates to the ability to produce high-purity zinc oxide powder using metal zinc as raw material, and to recover the reaction heat of zinc and oxygen in the production process of zinc oxide, thereby replacing it with the melting of zinc It is a zinc oxide preparation system that reduces external heat supply and reduces production costs and environmental pollution. Background technique [0002] Normally, metal zinc gradually undergoes a chemical reaction as it comes into contact with oxygen in a normal temperature environment, and turns into zinc oxide in the form of a hard film. When high-temperature zinc vapor comes into contact with oxygen, it reacts rapidly and turns into zinc oxide in the form of white powder. The preparation method of zinc oxide using this principle is equivalent to the dry method, and there are two kinds of direct method and indirect method. [00...

AI Technical Summary

Problems solved by technology

[0005] The indirect method is a method of producing zinc oxide by evaporating zinc lumps in a high-temperature electric furnace and reacting zinc vapor with oxygen in the air. Although there is basically no environmental pollution and high-purity products can be produced, the raw materials The price is expensive, and the electric furnace consumes a lot of electricity, which has the disadvantage of high production cost

[0006] The wet method is a method in which zinc ore is dissolved in an acid or alkaline solution, and zinc oxide is chemically leached and purified, then concentrated and dried to produce it. The product purity and production cost of this method are equivalent to those of the direct method. and the indirect method, but still has the problem of environmental pollution

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