Composite fire-proof material with high refractoriness under load for coke ovens as well as furnace-building process and products thereof

Abstract

The invention discloses a composite fire-proof material with high refractoriness under load for coke ovens. The preparation method of the material comprises the following steps of: evenly mixing and crushing 40%-60% of Al2O3, 15%-30% of SiC micro powder, less than 2% of Fe2O3, 5%-10% of Si micro powder and 1%-3% of cement as an additive; adding 3%-5% of Al(H2PO4)3 as an adhesive and stirring and mixing evenly; and pouring the mixture to a working region in 20-30 minutes. The furnace-building process comprises the following steps of: cleaning a kiln, measuring, molding, positioning and supporting a mould, adding materials, pouring and correcting, cleaning, starting for warming up and testing. The coke ovens newly built by pouring is characterized in that the top of the chamber of the furnace is fan-shaped, the chamber of the furnace is built by on-site seamless overall vibration pouring according to the process above with the furnace-building materials above, afterheat of the furnace can be recycled for power generation and no chemical residues exist. The furnace is short in charring time and higher in coke recovery and can be started and used at any time between the normal temperature and 1550 DEG C.

Description

technical field [0001] The invention relates to a refractory material and a coke oven, in particular to a composite high-load soft refractory material for a fan-shaped coke oven, a furnace building process and a fan-shaped coke oven obtained therefrom. Background technique [0002] The traditional fan-shaped coke oven building technology and materials, see figure 2 , the material SiO2 is used, and the furnace is built with modular fired silica bricks. Its characteristics are: 1. It is built with a large number of rectangular silica bricks and special-shaped silica bricks (the bottom lining brick is clay brick), and the furnace building process is complicated and time-consuming. 2. Silica bricks are machine-pressed and sintered slowly at 1500 oC to make finished bricks. After the furnace is built and used, it still has the property of multi-lattice phase transition under the condition of temperature change. It is determined that it still needs to be The oven can only be used...

AI Technical Summary

Problems solved by technology

[0002]For traditional fan-shaped coke oven building technology and materials, see Figure 2, the material SiO2 is used, and the furnace is built with modular fired silica bricks. Its characteristics are 1. A large number of rectangular silica bricks and special-shaped silica bricks (bottom lining brick clay bricks), the furnace building process is complicated and time-consuming

2. Silica bricks are machine-pressed and sintered slowly at 1500 oC to make finished bricks. After the furnace is built and used, it still has the property of multi-lattice phase transition under the condition of temperature change. It is determined that it still needs to be The oven can only be used if the temperature rises slowly for more than 45 days. The existence of residual quartz reduces the thermal vibration stability, and the use temperature must be controlled between 800oC-1650oC for long-term use. Continuous use has good soft performance, below 800oC Poor time stability

3. The use time conditions are relatively harsh, and it cannot be used repeatedly. It can only be used once, and the wear resistance, anti-skinning performance and kiln hanging performance are insufficient.

In addition, the silica brick modular structure has expansion joints due to the excessive expansion rate of the silica brick, which is the main reason for the low air tightness.

[0003]In the past, due to material limitations, users of coking refractory materials theoretically accepted the solution of on-site pouring, but they dared not put it into practice. Stay away from this monolithic pouring technology

[0004]In addition, the domestic refractory industry has tried to use blast furnace aluminum bricks, magnesia-chrome spinel bricks, and zirconium-containing series products to replace silica bricks in coking furnaces, but Because chromium Cr has secondary pollution, and the detoxification of this element is difficult, and the cost of detoxification is high; the price of zirconium Zr series products is high, and it is impossible to use it in coking furnaces

Therefore, the comprehensive performance indicators of the above products are insufficient or not environmentally friendly, and the price is too high and there is no market promotion.

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