Tunnel kiln

Abstract

The invention relates to a tunnel kiln. The tunnel kiln is composed of a kiln chamber, a combustion device, a ventilation device and a conveying device. The kiln chamber sequentially comprises a heating section and a cooling section from a brick inlet and a brick outlet. The heating section sequentially comprises a preheating section and a sintering section. The further the heating section is away from the brick inlet, the higher the temperature is. A cold air pipe is installed above a ceramic tile conveying surface of the preheating section. Blow holes are formed in the cold air pipe. The air outlet direction of the blow holes is downward, and the cold air pipe can vibrate. According to the tunnel kiln, glistening glaze crystals are obtained through furnace transmutation of waste gas of the kiln, waste is turned into wealth, the problem that waste gas of the kiln pollutes the environment is solved, cost for treating the waste gas of the kiln is reduced, operation is simple and easy to control, and prepared glistening glazed ceramic tiles are stable in performance and unique in effect.

Description

[0001] This patent application is a divisional application, the application number of the original application is 201210555621.7, the application date is December 19, 2012, and the title of the invention is: "A method for preparing flashing glazed tiles" technical field [0002] The invention relates to a tunnel kiln and a method for preparing flashing glazed tiles, in particular to a tunnel kiln with a cold air duct in the preheating section, and a method for preparing flashing glazed tiles with the tunnel kiln, belonging to Building materials field. Background technique [0003] Ceramic tiles are plate-shaped or block-shaped ceramic products produced by clay and other inorganic non-metallic raw materials through molding and sintering processes. They are used to decorate and protect buildings, walls and floors of buildings. [0004] The method of firing ordinary clay ceramic products in a tunnel kiln can be divided into several processes: (1) remove residual moisture in the...

AI Technical Summary

Problems solved by technology

[0010] However, at present, the flash decoration of tiles needs to use lithographic flash powder, which is very rigid and uniform, and the labor intensity of workers is also high, and the material consumption is also high.

When ceramic tiles decorated with flash powder are calcined at high temperature in a kiln, the flash powder is very unstable and sensitive to the atmosphere of the kiln, causing some flash powder to be bright and some not bright, making production control difficult

As for the flash powder itself, because it contains rare metal elements (such as Ce) to flash, its price is relatively high, its manufacture is difficult, and its use and manufacture consumes a lot of resources.

And the existing flash powder is generally embossed flash, can not melt flash

[0011] In the process of kiln production, a lot of energy needs to be consumed, because most of the ceramic raw materials contain sulfur elements, such as pyrite (FeS 2 ), iron sulfate, calcium sulfate, sodium sulfate, etc., in the firing process, easily lead to the generation of sulfur dioxide, SO 2 Gas not only pollutes the environment and destroys ecology, but also directly affects the production quality of products and corrodes production equipment

The treatment of kiln exhaust gas leads to an increase in production costs. If it is not handled properly, it will easily cause serious environmental pollution

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