Long-life thermal insulation material and efficient submerged arc furnace

Abstract

The invention discloses a long-life thermal insulation material. The long-life thermal insulation material takes Al2O3-SiO2-series raw materials as composite main aggregates and takes raw materials such as alumina, flint clay, andalusite and kyanite as auxiliary materials, the linear change on reheating is 0.15%, and the thermal shock resistance is 70 times. According to a submerged arc furnace prepared from the material, lifting ring bases and sliding guide wheels are fixedly connected to a furnace door bottom plate, reinforcing rib plates are fixedly arranged on the furnace door bottom plate, a refractory brick is fixedly embedded between every two adjacent reinforcing rib plates, and connecting plug pins are inserted into the refractory bricks and the reinforcing rib plates in a penetrating mode; and each refractory brick is provided with a brick body inserting groove and a rib plate inserting groove and further provided with an inserting tenon groove and an inserting convex tenon,the inserting tenon grooves and the inserting convex tenons are located on the inserting faces close to the hot faces of the upper faces of the refractory bricks, and the inserting tenon grooves and the inserting convex tenons are located on the two corresponding opposite inserting faces. The furnace door structure is good in stability, the refractory bricks mesh with one another closely, and erosion and damage of high-temperature erosion gas on a furnace door body can be effectively prevented.

Description

technical field [0001] The invention relates to a smelting furnace used for metal smelting, in particular to an improvement of the furnace door structure of a submerged arc furnace. Background technique [0002] Submerged arc furnace, also known as electric arc furnace or resistance electric furnace, is mainly used for the reduction smelting of metal oxide ores. It is an industrial electric furnace with huge power consumption. Its electrodes are inserted into the charge for submerged arc operation, and the energy and current of the arc are used to pass through the charge. , to smelt metals by generating energy from the resistance in the charge. [0003] The submerged arc furnace mainly includes a furnace shell, a furnace cover, a furnace door, electrodes and a dust removal and smoke exhaust system. The submerged arc furnace door is frequently opened due to the needs of feeding and pushing operations, so the submerged arc furnace door It must meet performance requirements su...

AI Technical Summary

Problems solved by technology

Therefore, under the condition of continuous high-temperature radiation, the furnace door is not only prone to distortion and deformation of the furnace door panel, but also the leakage of heat energy in the furnace, so that the potential risk of harm to the human body due to strong arc light, thermal reaction noise and external radiation of high-temperature airflow in the furnace is extremely high. And it is easy to cause the refractory material on the furnace door to fall off and collapse, which directly affects the thermal efficiency of the submerged arc furnace, increases power consumption, and affects production efficiency

[0004] The applicant applied for the invention patent "Submerged Arc Furnace Door" on May 1, 2015, patent number: 201520274579.0; Filled with refractory bricks, although the furnace door can better solve the problem of twisting and deformation of the furnace door, its structure is complex, the door body is heavy, the installation of refractory bricks is difficult, and it is easy to fall off; and the steel transverse beams and longitudinal beams Exposed in the direction of the furnace, the high-temperature airflow and corrosive gas in the furnace directly erode the exposed surfaces of the transverse beams and longitudinal beams, and the high-temperature corrosive gas leaks through the gaps in the refractory bricks to the inside of the furnace door, forming beams and steel floors. Corrosion shortens the service life of the furnace door and reduces the thermal efficiency of the submerged arc furnace

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