Composite low-aluminum lattice brick and production method thereof

Abstract

The invention discloses a composite low-aluminum lattice brick. The composite low-aluminum lattice brick comprises a clay brick base body with multiple airflow passages, and inner walls of the airflowpassages are provided with highly-siliceous coating layers by compounding. The brick base body is made by adding a small quantity of plastic clay and a binding agent into main materials including flint clay, siliceous chamotte, pyrophyllite raw materials, molten quartz and siliceous clay raw materials. The highly-siliceous coating layers on the inner walls of the airflow passages are made by adding a small quantity of plastic clay fine powder, a dispersing agent, a binding agent and an anti-settling agent into main materials including siliceous pyrophyllite, silica, molten quartz and silica powder, and raw materials of the highly-siliceous coating layers are prepared into slurry which is then sprayed or injected to surfaces of the airflow passages to form a whole with the base body by firing. By the process, on the one hand, the lattice brick is great in thermal shock resistance, and on the other hand, the lattice brick is excellent in alkali erosion and permeation resistance, and accordingly the service life can be effectively prolonged.

Description

technical field [0001] The invention relates to a refractory material for a large coke oven, in particular to a composite low-aluminum checker brick for a coke oven regenerator, and also relates to a production method of the composite low-aluminum checker brick. Background technique [0002] Low-aluminum checker bricks are a kind of porous refractory bricks that are stacked in the regenerator of large coke ovens and recover the waste heat of high-temperature flue gas emitted from the combustion chamber through alternate heat storage / radiation. [0003] Traditional coke oven checker bricks usually use clay refractory materials, of which Al 2 o 3 The content is between 40% and 50%. This kind of clay checker brick has good thermal performance, is resistant to rapid cooling and rapid heating, and can well meet the sharp changes in the alternating temperature difference of the regenerator. It can show a good use effect in the initial stage of production. . However, as the use ...

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Problems solved by technology

However, with SiO 2 The increase of content, Al 2 o 3 As the content decreases, the mullite composition with good resistance to rapid cooling and rapid heating will continue to decrease. In the sharp change of the alternating temperature difference in the regenerator, the checker bricks are easy to crack, which affects the use

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