Improvement of the masonry structure of the upper and lower furnace mouths improves the masonry structure of the upper and lower furnace ports as shown. Improved causes of damage to the forehearth lining The reasons for the damage of the refractory lining of the metallurgical furnace are as follows: (1) The role of mechanical force: mainly the scouring and splashing of the melt, and damage caused during the cleaning of the furnace mouth . This is particularly true in the practice of converter production, especially in the tuyere zone and the tuyere zone.
Improve the front and bottom furnace masonry structure (mm) 1 wedge bricks; 2 straight brick (2) the role of thermal stress: the furnace temperature during the operation of the intense and frequent fluctuations, including the furnace body temperature, which is The main reason for the spalling, breaking, and falling of the refractory lining. Therefore, there is a high requirement for the thermal stability and structural strength of refractory materials.
(3) The role of chemical attack: Fimorite (2FeO.SiO2) penetrates and melts the chromium-magnesia refractories, destroys its structure, and causes deterioration of the material; solvent (SiO2) and periclase (MgO) in the material Formation of forsterite (2MgOSiO2) with a lower load softening temperature in an atmosphere with higher Fe2O3 concentration reduces the workability of the refractory material. Iron oxides saturate the grains of periclase and chromite, causing grain destruction and destroying the refractory material too quickly.
In addition, whether the quality of chromium-magnesia brick reached MgO60%, Cr2O320%, Fe2O310%, apparent porosity is not more than 20%, the size deviation in line with the provisions of YB418-63 and the quality of brick masonry and masonry technology to meet the requirements, but also caused Metallurgical furnace refractory lining damage can not be ignored important factors.
Analysis of Causes of Damage to Brick Body of Rotary Refining Furnace Port After a long period of follow-up, inspection, research, careful analysis of breakage and shedding of rotary hearth brick of Dongfang Copper Co., Ltd., consensus reached and production Practice has proved that the most fundamental reason is brickwork and masonry, which must be improved.
Brick and masonry process improvement and improvement measures (1) The original bricks of the upper and lower burners were changed from sintered chrome-magnesia bricks to fused and fused magnesia bricks. (2) Increase the geometric size of the original upper and lower furnace bricks and change the brick shape to a complex shaped brick. The geometrical dimensions of the profiled bricks are shown. Shaped brick geometric dimensions (mm) (3) The original masonry from staggered masonry to staggered joints.
After the improvement of process characteristics (1) After the improvement, the upper and lower furnace bricks are made into an arch shape, which is symmetrical, firm and stable. Starting from the center, the reverse arch is built symmetrically on both sides and closes on both sides. The brick can naturally arch. The gap between the brick body and the water jacket is compacted with steel fiber ramming material.
(2) This brick has grooves. Made of a18mm round steel / D 0 hook, one welded to the wall of the furnace shell, and the other hanging on the brick, the filler between the brick body and the furnace shell filled with magnesia compaction. (3) The brickwork of the rest of the furnace body is not changed, and the brickwork and geometric dimensions are not changed. (4) After the improvement, it will not have any impact on the original production process and will not affect the process conditions and product quality indicators.
After more than 4 years of production practice, this process has achieved very satisfactory results. During this period, rotary refining furnaces carried out a total of 11 medium repairs and 2 major repairs, with no broken bricks or bricks missing. Compared with the original masonry process, there are the following advantages: (1) Thoroughly solve the problems of broken tiles, dropped bricks and overall shedding of the furnace mouth. (2) Production is stable, production capacity is increased, consumption of tons of magnesium bricks is reduced, and processing costs are reduced. (3) The furnace mouth is no longer repaired, the life of the furnace is extended, and the labor intensity of the worker is reduced. (4) The purpose of synchronous maintenance of the tuyere brick, the copper outlet brick and the furnace mouth brick is realized.
Conclusion (1) The process improvement, one-time test was successful and applied in the production practice, and did not have any impact on the main production process. On the basis of reducing the labor intensity of workers, the service life of the metallurgical furnace body was extended and the production capacity was increased. For the factory to create a very considerable economic benefits. (2) In addition to the considerable economic benefits, the single furnace saves over 200,000 yuan in maintenance costs, labor costs, working hours and material costs each year. (3) In the production practice, the R18mm round steel was not used when the lower furnace mouth was constructed with this special-shaped brick, and the effect was equally satisfactory.
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