How to fire blue bricks

When firing bricks and tiles, the green body made of iron-rich clay is baked, and the iron compound is oxidized into red iron oxide (Fe2O3) to make red bricks and tiles. If a large amount of coal is added into the kiln after roasting, the kiln is closed for about 1 day, and then water is slowly added from the top of the kiln for 7 days, the steam reacts with the high-temperature carbon in the kiln, and a large amount of reducing gas hydrogen and carbon monoxide will be generated in the closed calcining kiln, which will gradually reduce the red high-priced iron oxide, iron oxide, iron oxide, iron oxide, iron oxide, iron oxide, iron oxide, iron oxide, iron oxide, iron oxide.

The color of the green body is determined by the contents of iron and titanium oxide in the raw material of the green body. The higher the content, the darker the color after firing, which only determines the color of the green body and will not affect the quality of the brick. The landlord can improve the next process when making bricks.

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