Water system press-in grouting material used for iron making hot blast heater system and preparation method thereof

Abstract

The invention discloses a water system press-in grouting material used for an iron making hot blast heater system and a preparation method thereof. The material includes the following components by weight: 72-81 parts of bauxite, 5-10 parts of corundum fine powder, 3-6 parts of alpha aluminum micro powder, 1 part to 3 parts of green clay, 1 part to 3 parts of bentonite, 1 part to 3 parts of kyanite, 0.5-1 part of yttrium oxide, 0.5-1 part of lanthanum oxide, 1 part to 2 parts of dextrin, 2-4 parts of silica gel powder, 1 part to 2 parts of silicon powder, 0.5-1 part of carboxymethylcellulose, 0.2-1 part of sodium tripolyphosphate and 0.2-1 part of sodium hexametaphosphate. The water system press-in grouting material adopts a three-grade matching main material, a composite rare earth materials, a composite binding agent and the like, greatly improves compactness, greatly improves normal temperature strength, improves strength constantly with rise of temperature, and is good in heat and shock resistance stability and strong in anti-erosion capability. Pulverization dropping cannot happen after the material is pressed in a furnace lining, and the material can serve as a simple, effective, energy-saving furnace device maintenance material.

Description

technical field [0001] The invention relates to a water-system press-in grouting material for an ironmaking hot blast stove system and a preparation method thereof, belonging to the field of refractory materials. Background technique [0002] With the enlargement of the blast furnace and the improvement of the smelting intensity, the air temperature and top pressure of the hot blast stove system in iron and steel enterprises are increasing. After the hot blast stove system is put into use, due to the enhanced smelting of the hot blast stove, the inner lining The working conditions are more severe, and the damage is more serious, especially at the combustion port, the temperature rise of the hot air pipe and the pipe connection is quite serious. The short pipes connected to the hot air stove body are only suitable for normal pressure operation. When the blast furnace is operated at high blast temperature and high top pressure, the deformation of the hot blast main pipe increa...

AI Technical Summary

Problems solved by technology

Phosphate mud uses phosphoric acid as a binder, and the most common one is solid powdery phosphate mixed with water. The low-temperature drying flexural strength of the mud is about 1Mpa, which cannot meet the high-temperature and high-pressure smelting strength of modern blast furnace ironmaking. , and the temperature of the parts to be grouted in the hot blast furnace system is generally 300°C, and the phosphate mud is generally blown away by high-temperature and high-pressure wind in this temperature range for about a week, resulting in a decrease in the temperature and pressure of the air supplied to the blast furnace smelting, resulting in a large ironmaking output decline, seriously affecting the economic benefits and production safety of enterprises

Due to the defects of several traditional press-in materials on the market, the material will soon pulverize and fall off after being pressed into the furnace lining, the gap of the furnace lining will expand, and the temperature of the furnace shell will turn red repeatedly, which seriously threatens safety. Production, had to be repeatedly pressed into the grouting, and even large-scale excavation and shutdown maintenance, wasting a lot of manpower and material resources, and caused huge losses in the shutdown of the furnace; The damage of the furnace lining shortens the service life of the equipment, wastes a lot of non-renewable resources, and brings huge economic losses to the enterprise

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