Al2O3-SiO2 content-graded refractory brick for stamp-charging coke oven

Abstract

The invention relates to an Al2O3-SiO2 content-graded refractory brick for a stamp-charging coke oven. The technical scheme includes that the refractory brick is made of Al2O3-SiO2 raw materials of n grades, wherein n refers to natural numbers ranging from 3 to 10; and the content of Al2O3 and SiO2 in Al2O3-SiO2 raw materials of each grade gradually changes grade by grade, namely the content of Al2O3 in the Al2O3-SiO2 raw materials of the first grade is progressively decreased from being larger than 75wt% to be smaller than 7wt% at the nth grade, and the content of SiO2 in the Al2O3-SiO2 raw materials of the first grade is progressively increased from being smaller than 25wt% to be larger than 93wt% at the nth grade . The preparation method includes: burdening according to Al2O3-SiO2 raw materials corresponding to each grade, and respectively mixing; adding lignin liquor which is 5-10wt% of the raw materials of each grade into the corresponding raw materials of each grade, mixing, pouring the raw materials of each grade into corresponding spaces in a mould respectively, forming and drying; and sending to a tunnel kiln, and calcining at 1400-1500 DEG C for 40h. The Al2O3-SiO2 content-graded refractory brick has the advantages of integral firmness, long service life, low cost and convenience for construction.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. Specifically relate to a kind of Al for tamping coke oven 2 o 3 -SiO 2 Quality content graded refractory bricks. Background technique [0002] The tamping coke oven is side-loaded coal coking by the tamping method. Before entering the furnace, the mixed coal is tamped with a tamping machine into a coal cake whose volume is slightly smaller than that of the carbonization chamber, and then pushed into the carbonization chamber for coking. Both theory and practice have proved that tamping coking can expand coking coal resources and use more coal materials with poor cohesiveness; for coal materials with poor cohesiveness, the coke strength can be improved; The price of poor coal is generally lower, and tamping and coking can reduce the cost of raw materials. [0003] At present, in order to make reasonable use of coking coal resources, improve production efficiency and reduce enviro...

AI Technical Summary

Problems solved by technology

For large tamping coke ovens, since the furnace door on the machine side is exposed to the air for a long time when pushing coke and charging coal, the temperature of the furnace head bricks on the machine side and even the vertical flue wall bricks on the machine side furnace head is relatively large. Large, it is easy to cause these bricks to peel off or even crack, affecting its overall firmness and service life

[0004] There are two main types of burner designs on the coke side of existing coke ovens: (1) The furnace head on the machine side adopts a single-layer structure of silica bricks. Because the silica bricks have poor resistance to rapid cooling and rapid heating, the furnace head is prone to breakage, and there are also The single-layer structure of andalusite bricks or sillimanite bricks is used for the furnace head on the machine side, which has been improved to a certain extent, but the cost is higher; (2) the furnace head on the machine side adopts the outer layer of high alumina brick and the inner layer double layer structure of bricks

This kind of furnace head structure has better resistance to rapid cooling and rapid heating, but high-alumina bricks are used near the furnace mouth, which have different expansion coefficients from silica bricks. Although the internal small bite measures are adopted, there are still high-alumina bricks on the upper part of the furnace mouth. The phenomenon that the bricks are brought up by the silica bricks on the inner side of the furnace wall and the side of the furnace mouth is "overlapped"

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