2 Wuhan Ship Vocational and Technical College Tan Yinyuan Luo Hongying Wuhan Fang Pump Industry Group Co., Ltd. Mei Liping Zhou Huimin asked about the use of high-alumina bauxite lining for the medium-frequency induction furnace acid lining life of only about 20 times. And conduct experiments. Through three years of production practice, its life expectancy can reach 40,60 heats, and the equipment maintenance rate is low, and the economic benefits are obviously improved.
1 furnace village material selection 1.1 high alumina bauxite chemical composition to obtain high performance sintered bismuth, its liquid phase is controlled at 5,7. Because refractory products contain certain impurities, and with the enhanced fire resistance, therefore Choose the grade high aluminum 矾 seven. Its performance cost indicator.
The refractoriness of the production area is æ±¾, 2 other Wang Ri Ri and Henan in the production practice, it is found that the content under the condition of 123 content directly affects the service life of the lining and the surface roughness of the lining. When Fe23 contains M too high. The aspect causes the lining of the furnace to be crusted.
The volume of the crucible is made smaller; in addition, the corrosion resistance of the furnace lining against oxygen slag is reduced, and the unsafeness of the furnace lining is increased. Therefore, when melting alloy steel. In addition to controlling the content of 1203 in high alumina bauxite, the content of 523 must be strictly controlled within the specified range.
Densification sintering of bauxite lining.
2 furnace oven process Because high alumina bauxite is easier to knot than quartz sand, special attention should be paid to the thickness of the furnace when building the furnace. The thickness of each layer is strictly controlled at 50, 70. The furnace time of each layer is controlled at 15, 20, and out. The layers should be sufficiently loose to ensure the connection between the layers.
The low-temperature baking rapid heating high-temperature short-time sintering process, such as the cabinet 1. After the knotting of the furnace lining, the natural wind corpse 241 is then baked at a power of 5, 30, intermittently, and the stencil bucket is red. After the internal gas is completely discharged from the sintered layer. The temperature is rapidly increased at full power to melt the alloy and keep it at 0.5, 1 and then enter the post-smelting stage.
3 furnace maintenance and maintenance 1.2 particle size ratio is to obtain low porosity and high thermal shock resistance. The particle size ratio must be chosen reasonably.
Specification nnn ratio 150 electric furnace ancestor particle size takes the lower limit. Fine-grained upper limit. The upper limit of the coarse grain size of the electric furnace is taken, and the lower limit of the fine particle size is taken. When the lining of the furnace lining occurs, the slag of the part is scraped off with steel brazing in time. The residual metal liquid is removed, and the repaired portion is wetted with a little boric acid and Water, and then repaired and compacted with the high alumina bauxite of the latter material of the furnace material.
In order to prevent damage to the furnace part during feeding, after repairing the furnace body, the surface of the repairing part is smeared with water glass and aluminum bauxite clinker, and the surface is dried before feeding.
4 Conclusion 1.3 Binder smelting alloy steel requires higher purity of 120382. To reduce the sintering temperature, 1.2, 1.5 industrial boric acid was added as a binder. The sintering temperature is 145,1 550. During the heating process, boric acid starts to melt at about 570, and it acts as a bonding agent to promote high pass practice and production verification. The furnace lining knotted with high-grade bauxite should be Strictly control the content of 1203 and 6203. Choose a reasonable particle size ratio and binder amount. And the use of low temperature baking rapid heating high temperature short time baking process. Its lining spring life is 2, 4 times that of acid furnace lining, and saves electricity and electricity, reducing equipment maintenance costs. Edited by Chen Yichen, Tan Yinyuan, born in 1964, associate professor, Hanyang, Wuhan, 43,05,
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