High thermal conductivity silicon carbide grouting material combined with sol used for bottom leveling of blast furnace

Abstract

This invention belongs to refractory material field. It is concerned with a kind of high thermal conductivity silicon carbide grouting material combined with sol used for bottom leveling of blast furnace. The raw material component proportion of high thermal conductivity silicon carbide grouting material combined with sol is that 55-65% of 98 silicon carbide particle,10-20% of 98 silicon carbide powder, active a The invention discloses a novel coating material to be applied at the bottom of blast furnace with ingredients as follow: 8 to 14 percent of alumina powder, 0 to 3 percent of graphite, , 0.3 to 0.7 percent of curing agent, 0.5 to 0.8 percent of dispersing agent, and 10 to 14 percent of silica solution. The high-thermal conductivity silicon carbide pouring material described in this invention is easy to be constructed with short construction period, high thermal conductivity, high flatness, and long volume stability. Also the novel coating material is difficult to deform with strong anti-corrosion ability and without environment pollution, which is a novel coating material to be applied at the bottom of blast furnace.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a sol-bonded high-thermal-conductivity silicon carbide potting material used for the leveling layer of the bottom of a blast furnace. Background technique [0002] The leveling layer of the blast furnace bottom refers to the area under the furnace bottom water cooling tube and the furnace bottom sealing plate, and the area above the furnace bottom sealing plate and between the carbon bricks. The bottom part of the blast furnace is the most important link in the blast furnace system, and damage to the bottom part means the end of a generation of furnace life. The blast furnace bottom has been subjected to high temperature, high pressure, slag and iron erosion and infiltration for a long time, and the working conditions are very harsh. The requirements for refractory materials are particularly strict, especially the materials are required to have excellent thermal co...

AI Technical Summary

Problems solved by technology

[0004] (1) The construction quality is poor: the inner edge of the I-beam under the sealing plate and the corners of the furnace bottom are narrow and difficult to construct, and the construction quality mainly depends on the experience of the construction personnel. If the construction of the carbon ramming material is not strictly followed Note that the operation will cause the strength of the ramming layer at the four corners of the construction body to be too low and not dense enough, resulting in poor thermal conductivity of the ramming material, affecting heat conduction and being vulnerable to erosion and erosion

[0005] (2) Low thermal conductivity: The main raw materials of carbon ramming materials are artificial graphite and binder. Due to the low degree of graphitization of domestic artificial graphite, the thermal conductivity of graphite raw materials is low, which seriously affects the performance of carbon ramming materials. Thermal conductivity: In the finished product, the binder molecules are wrapped around the graphite bone powder to form a layer of resin film. The resin film forms an insulating layer after polymerization hardening, which hinders the heat conduction between the graphites and reduces the thermal conductivity. In addition, the construction operation Irregularities also have a great impact on the thermal conductivity of ramming materials. Generally, the thermal conductivity of domestic carbon ramming materials is 10-14W / m·K

[0006] (3) Poor volume stability: During the normal production process of the blast furnace, the temperature of the ramming material is below 100°C, and the condensation polymerization reaction inside the material gradually hardens, accompanied by a large amount of volatile matter escaping, resulting in an increase in the porosity of the material and a large volume shrinkage Cracks form a gas leakage channel, and the leakage of high-temperature and high-pressure gas causes the temperature of the bottom of the furnace to rise, while reducing the thermal conductivity and affecting heat conduction

[0007] (4) The construction period is long: the materials are spread in batches during the construction, and the materials need to be continuously hammered back and forth for 3 to 5 times until they are compacted. A total of 3 to 4 times of materials are required. For general medium-sized blast furnaces (furnace capacity 1000-2500m 3 ), this construction method generally takes 2 to 3 days to complete the construction

[0008] (5) Serious environmental pollution: carbon ramming material uses resin and tar as binder, and adds organic additives such as curing agent and preservative at the same time. During the ramming construction process of ramming material, the organic matter in the binder evaporates. It contains a lot of harmful substances such as free phenol and formaldehyde, etc. These substances are highly irritating, making people's eyes feel hot, tearing, red and swollen, and when the concentration is high, they will feel nausea or even suffocation.

Therefore, the construction environment is extremely harsh and poses a serious hazard to the health of construction workers.

[0009] (6) Low strength and poor flatness: After the construction is completed, the inside of the material is only bonded together by the adhesive force of tar and resin, and has not really hardened, so the strength is very low, and the material must be heated to harden. Strength; carbon brick masonry needs to be operated on the leveling layer. A large number of construction workers walk back and forth and carbon bricks are placed and masonry will cause defects and force deformation of the material due to bumping, resulting in pits and pockmarks on the surface of the leveling layer. Flatness is also greatly affected, affecting carbon brick masonry

[0010] To sum up, it can be seen that the problems of the leveling layer at the bottom of the blast furnace are that the carbon ramming material has low thermal conductivity, low strength, large volume shrinkage, serious erosion and erosion due to gas leakage, poor construction environment, and serious air pollution.

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