A corundum refractory ball for a ball-type hot blast stove and its preparation method

Abstract

A corundum refractory ball for a spherical hot blast stove and a preparation method thereof, characterized in that: the corundum refractory ball includes the following main ingredients, binders and additives; wherein the main ingredients include the following raw materials in weight percentages: 0-15% of corundum with a particle size of 5-3mm, 30-60% of corundum with a particle size of 3-1mm, 5-30% of corundum with a particle size of 1-0.088mm, 0-10% of corundum with a particle size of less than 0.044mm, and 0-10% of corundum with a particle size of less than 0.088mm High alumina bauxite clinker 10-25%, α-Al2O3 particles 2-10%, zirconia-containing material 1-10%, clay 2-8%, mullite or mullite-containing main phase material 2-10% %; the added amount of the binder is 1-6% of the weight of the main material; the added amount of the additive is 0-1% of the weight of the main material. The preparation method of the present invention adopts trapping, back-rolling, machine-pressing, drying the green body, and then firing in a tunnel kiln at a firing temperature of 1450°C to 1600°C.

Description

technical field [0001] The invention relates to the technical field of refractory material production, in particular to a corundum refractory ball for a ball-type hot blast stove and a preparation method thereof. The corundum refractory ball can be used in the high-temperature section and the medium-temperature section of the large and medium-sized blast furnace ball-type hot blast stove. technical background [0002] At present, the spherical hot blast stove is replacing the traditional hot blast stove with its advantages of small footprint, high thermal efficiency and low investment. In order to improve the stability of large and medium-sized ball hot blast stoves and increase their wind temperature, high-quality refractory balls are needed to support them. So far, magnesium-aluminum balls and high-alumina balls have been mostly used in the high-temperature and medium-temperature sections of large and medium-sized blast furnace ball-type hot blast stoves. Although magnesi...

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Problems solved by technology

So far, magnesium-aluminum balls and high-alumina balls have been mostly used in the high-temperature and medium-temperature sections of large and medium-sized blast furnace ball-type hot blast stoves. Although magnesium-aluminum balls have the advantages of high density, high heat capacity, strong heat storage capacity, and good alkali resistance, However, magnesium aluminum balls have low strength, poor thermal shock resistance, easy hydration damage during use, are not suitable for acid slag erosion, and have a low service life.

The high alumina ball has low strength, low density, poor chemical corrosion resistance, and is easy to deform and block the gas passage during use, so that the ball replacement cycle is short, which cannot meet the use of large and medium-sized ball hot blast stoves.

In order to adapt to the large-scale technology of the ball hot blast furnace and solve the problem of low life of the pebble bed, it is imperative to develop new material refractory balls

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