High thermal conductivity silica brick for coke oven and preparation method thereof

Abstract

The invention relates to a high thermal conductivity silica brick for coke oven and a preparation method thereof. The high thermal conductivity silica brick for a coke oven comprises the following components by weight: 68.0%-82.0% of natural silica particles, 13.0%-26.0% of natural silica powder, 0.5%-2.0% of an additive containing dispersant, 1.5%-5.0% of siliceous non oxide, 1.0%-3.0% of a mineralization agent, and an additional binder in the weight 1.5%-3.0% of the total weight of the previous materials. The additive comprises a dispersant carboxymethyl cellulose (CMC) with granularity less than 0.088 mm and siliceous non-oxide Si with granularity less than 0.043 mm, wherein the content of Si is greater than 96 wt.%. The silica brick provided by the invention has high thermal conductivity and keeps other comprehensive excellent performances of silica brick, and can satisfy the demands of coke oven for longevity, energy saving and high efficient production.

Description

technical field [0001] The invention relates to a silicon refractory material used in the field of coke ovens, in particular to a high thermal conductivity silica brick for coke ovens and a preparation method thereof. Background technique [0002] Silica brick is the most important refractory material for modern large-scale coke oven masonry. The design direction of advanced coke oven is high efficiency, longevity, energy saving and environmental protection. The performance of silica brick directly affects the advancement of coke oven technology. For a long time, people have paid more attention to the refractory properties of silica bricks, such as strength, thermal shock, and load softening, in order to make the coke oven as long as possible. However, with the increasingly stringent requirements for energy saving and environmental protection, enterprises require coke ovens to save gas consumption and reduce COx and NOx emissions during the coking process. There are two...

AI Technical Summary

Problems solved by technology

[0004] In the existing silica brick manufacturing technology, there is still the problem that the internal structure and performance of the silica brick are relatively uneven

Because silica bricks are manufactured in the kneading process, the addition of traditional mineralizer-lime milk is added into the wet mill through pipelines, and it is quickly covered by some silica particles and fine powder, which cannot be well evenly distributed in the mud. Make the distribution of CaO in the adobe uneven

During the sintering process, at the same temperature, the inter-particle and matrix SiO 2 The crystal form transformation is uneven, some local transformations are too fast, and some local transformations are too slow, so the expansion stress inside the brick body due to the crystal transformation is very uneven, and it is easy to cause large pores and even cracks. Not only affects the yield, but also affects the stability of the quality of silica bricks

Therefore, it is limited to homogenize the distribution of the mineralizer only by physical mechanical stirring, which will affect the uniformity of the internal structure of the silica brick, which will affect the performance of the silica brick.

[0005] Due to the limitations of the mineralization effect of traditional mineralizers and the addition form of existing ordinary silica bricks, the moisture distribution in the process of making semi-finished silica bricks is not uniform enough, and the moisture content of the mud is also high.

After the silica brick is fired, the distribution of pores left by moisture removal is also very uneven, and the local concentration of pore clusters is prominent, which seriously affects the improvement of the thermal conductivity of silica bricks.

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