Homogeneous same-phase silica mud for large coke oven

Abstract

The invention discloses a homogeneous same-phase silica mud for a large coke oven, which comprises the following components in parts by weight: 70-80 parts of waste silica bricks with SiO2 content higher than 94%, 17-25 parts of natural silica with SiO2 content higher than 98%, 2-5 parts of soft binding clay with Al2O3 content higher than 25%, 0.05-0.1 part of carboxymethyl cellulose, 0.1-0.2 part of white dextrin, 0.1-0.2 part of medium-temperature sintering agent sodium carbonate and 0.1-0.2 part of high-molecular polymer polyacrylamide. The homogeneous same-phase silica mud according to claim 1 comprises the granularity of the waste silica bricks comprises the following parts in parts by weight: 23-25 parts of 1-0.5mm waste silica bricks, 15-16 parts of 0.5-0.2 mm waste silica bricks, 8-10 parts of 0.2-0mm waste silica bricks, 13-15 parts of 180-mesh waste silica bricks and 11-14 parts of 220-mesh waste silica bricks. The homogeneous same-phase silica mud for the large coke oven according to claim 1 is characterized in that the sieving rate for the soft binding clay to pass through a 180-mesh sieve is bigger than 95%. A preparation method for the homogeneous same-phase silica mud according to claim 1 comprises the following steps: 1, preparing and adding 70-80 parts of waste silica bricks, 17-25 parts of natural silica, 2-5 parts of soft binding clay, 0.05-0.1 part of carboxymethyl cellulose, 0.1-0.2 part of white dextrin, 0.1-0.2 part of medium-temperature sintering agent sodium carbonate and 0.1-0.2 part of high-molecular polymer polyacrylamide to a double-helix mixing mill for pre-mixing; 2, packaging the mixed material based on piece weight; 3, adding the silica mud to a sand mixer at a using site, and directly adding the silica mud to the sand mixer, adding tap water which is 30-35% of the total weight of the silica mud for stirring for 10-15 minutes, and stewing the mixture for 30 minutes; and 4, directly coating the mixed materials to a brickwork for use.

Description

technical field [0001] The invention relates to a kind of material which is suitable for bricklaying of large-scale coke oven body, has the same quality and phase as the silica brick, and has the same thermal expansion rate as the silica brick. It consists of 70-80 parts of waste silica bricks, 17-25 parts of natural silica siliceous mud consisting of 2-5 parts of combined clay and 0.5-1 part of total weight of admixture. Background technique [0002] The siliceous mud used for coke oven silica brick masonry can be roughly divided into three generations. The 1970s was the first generation. The technical requirements of silicon cement are relatively smooth and simple, and the softening point under load is not even mentioned. The second generation of silicon fire clay is prepared with natural siliceous sand and soft bonded clay in a certain proportion, and sometimes additives are added. This generation of silicon fire clay focuses on solving the construction performance, i...

AI Technical Summary

Problems solved by technology

The second generation of silicon fire clay is prepared with natural siliceous sand and soft bonded clay in a certain proportion, and sometimes additives are added. This generation of silicon fire clay focuses on solving the construction performance, ignoring the bonding strength. When using natural silicon materials to prepare fire clay The mud still implements the YB384-63 standard, but the important component of silica brick powder is omitted, resulting in some coke oven silica fire clay and silica bricks not bonding, which is the biggest shortcoming of the second-generation silica fire clay

As the temperature of the coke oven increases, the expansion coefficient of the mud and the silica bricks is inconsistent, resulting in the volume effect being out of sync, and the mud and the silica bricks are not bonded. In fact, during the use of the coke oven, the silica bricks are only stacked together, and the mud It did not play its due role, which not only did not reduce the gas leakage rate of the furnace body, but also caused a waste of resources, and at the same time, the service life of the coke oven was not guaranteed

[0003] Most of the popular silica fireclays on the market are made of natural high silica soil, clay and raw silica stone. It can be well bonded with silica bricks at room temperature, but at high temperatures, since high silica and natural silica are raw materials, further tridymite during use will cause excessive thermal expansion of the mud , out of sync with the volume effect of the masonry (silicon brick), resulting in the mud not bonding with the silica brick masonry at high temperature. Advantages of liquefaction to alleviate the partial expansion of silicon mud