Maintenance-free and low-cost molten iron pretreatment spray gun and preparation method thereof

Abstract

The invention discloses a maintenance-free and low-cost molten iron pretreatment spray gun and a preparation method thereof. The spray gun comprises a composite gun core, a refractory gun lining covering at the periphery of the composite gun core and a connecting flange arranged above the composite gun core, wherein the composite gun core comprises an inner-layer gun core framework in which refractory plastics are filled. The preparation method comprises the steps of firstly, preparing the gun core framework, filling the refractory plastics inside the gun core framework, and preparing the composite gun core; then, welding a V-shaped anchoring part and a double-V-shaped anchoring part on the surface of the gun core framework in a staggered way, and welding a ring anchoring part at the top end of the V-shaped anchoring part; next, covering the refractory gun lining on the surface of the gun core framework; and placing a prefabricated spray gun model into a baking oven to bake to obtain the spray gun. By using the preparation method, the preparation quality of the spray gun is ensured, the preparation process and quality control of the spray gun are simplified, the consumption of materials and manpower for preparing the spray gun is reduced, and furthermore, the comprehensive preparation cost of the spray gun is reduced.

Description

technical field [0001] The invention relates to the field of blowing pretreatment for pretreatment of molten iron outside the furnace before converter steelmaking, in particular to a maintenance-free and low-cost molten iron pretreatment spray gun for blowing desulfurization of torpedo tanks or molten iron tanks and a preparation method thereof. Background technique [0002] At present, in the metallurgical industry, the spray gun used for the pretreatment of hot metal injection before the converter steelmaking is mainly composed of a metal gun core and a refractory material gun lining. Composed with the blowing port, the refractory material gun lining is integrally casted with castables. The disadvantages are the short life of the spray gun and the high price of the materials used to make the spray gun, which leads to high consumption costs of the molten iron injection desulfurization pretreatment spray gun, which seriously restricts the injection of molten iron. The produc...

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Problems solved by technology

[0002] At present, in the metallurgical industry, the spray gun used for the pretreatment of hot metal injection before the converter steelmaking is mainly composed of a metal gun core and a refractory material gun lining. Composed with the blowing port, the refractory material gun lining is integrally casted with castables. The disadvantages are the short life of the spray gun and the high price of the materials used to make the spray gun, which leads to high consumption costs of the molten iron injection desulfurization pretreatment spray gun, which seriously restricts the injection of molten iron. Production and operation benefits of blowing pretreatment process

However, according to reports at home and abroad, although the service life of spray guns has been greatly improved, there is a phenomenon of prolonged fatigue, which restricts the further reduction of the consumption cost of spray guns in the molten iron injection desulfurization process.

[0003] For this reason, scholars at home and abroad are gradually paying attention to the reduction of the production cost of the spray gun, especially in the country where the steel situation is severe and the market competition encourages, and research on the cost reduction of the spray gun has been carried out, such as: Chinese patent "Segmented molten iron pretreatment spray gun" ( Patent No. ZL201020183502.X), "Low-cost Hot Metal Pretreatment Spray Gun" (Patent No. ZL200920086152.2), "Integral Hot Metal Pretreatment Spray Gun" (Patent No. ZL201220139735.9), through the improvement of the overall structure of the spray gun structure and the optimization of metal materials Selection, utilization of refractory recycled materials, repair and utilization of metal gun cores, and optimization and light weight of the gun core structure, etc., to achieve the purpose of reducing the material consumption and cost of spray gun production, but limited by the harsh conditions of use of the spray gun and the mechanical strength requirements during the service period Due to the constraints of the spray gun, the weight and material consumption of the spray gun are slightly reduced, and the use of refractory recycled materials is limited; at the same time, for the repair and utilization of the metal gun core, due to the high cost of transportation and storage of the used spray gun, and the large manpower consumption in the process of dismantling and repairing, resulting in The overall cost of the spray gun has not decreased significantly; in addition, in the actual application process of the spray gun, the refractory lining of the spray gun is frequently damaged, resulting in a large amount of online repair and maintenance, which not only affects the operation rate of the desulfurization equipment, but also consumes a large amount of repair materials and maintenance manpower. Increased cost of hot metal desulfurization

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