Production and calcination process and equipment of spontaneous-combustion environmental-protection zinc oxide

Abstract

The invention discloses a production and calcination process of spontaneous-combustion environmental-protection zinc oxide. The process adopts a way of continuous production with negative pressure, zinc raw materials and oxygen conduct an oxidation-reduction reaction in an oxidation furnace to generate zinc oxide, a large amount of enthalpy is rejected at the same time, and the zinc oxide is obtained after working procedures of cooling and powder collecting. The outlet end of the oxidation furnace is connected with a calcination furnace, the gaseous zinc raw materials entering the calcination furnace from the oxidation furnace and oxygen conduct the oxidation-reduction reaction again to generate zinc oxide, a large amount of enthalpy is rejected, the directly-collected powder is calcined through a lot of heat from the oxidation furnace, and then the calcined zinc oxide is obtained after the working procedures of cooling and powder collecting. The process utilizes the own enthalpy of the raw materials to produce the zinc oxide and the calcined zinc oxide, and the purposes of saving energy, protecting environment, reducing the production cost, reducing the labor strength and increasing the production efficiency are achieved through a continuous automatic production way.

Description

technical field [0001] The invention belongs to the technical field of zinc oxide production and calcination technology and equipment, and mainly relates to a kind of spontaneous combustion environment-friendly zinc oxide [0002] Production and calcination process and equipment. Background technique [0003] Zinc oxide powder is a white or yellowish fine powder, which is widely used as one of the important chemical raw materials in ceramics, rubber, petroleum, glass, medicine, chemical and other industries. At present, the production process of zinc oxide is divided into direct method, indirect method and ammoniation method. 10 years ago, the direct process mainly used zinc concentrate as raw material, desulfurized at high temperature, oxidized and roasted into calcine, then reduced to zinc vapor with coal, and zinc oxide was obtained by oxidation of zinc vapor and air. Now the main raw materials used are zinc ash - hot-dip galvanizing, zinc-containing compounds such as ...

AI Technical Summary

Problems solved by technology

[0004] The above three methods, no matter which one needs to consume a large amount of energy, cause the production cost of zinc oxide to be high and difficult to lower

In order to reduce production costs, most production enterprises will choose more economical coal to produce zinc oxide. Since coal will produce harmful pollutants such as sulfur, dust and waste residue during the combustion process, it is also necessary to increase environmental protection equipment such as dust removal and sulfur removal. Avoiding environmental pollution will still increase the production cost of zinc oxide

In addition, the above-mentioned processes are intermittent and cannot be produced continuously. Generally, one furnace is produced once, that is, after one furnace of zinc oxide is produced, the slag is removed, and then the next furnace is reloaded to produce the next furnace. This is not only time-consuming, but also labor-intensive. Very large, severely limiting ZnO production efficiency

Furthermore, the existing production equipment for calcined powder is separated from the production equipment for directly collected powder, and calcined powder is obtained by calcining directly collected powder, which also has the problems of high energy consumption, high pollution, low production efficiency, and high production cost.

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