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Method for preparing high-quality calcium magnesia by superhigh-temperature calcination

An ultra-high temperature, magnesia-calcium sand technology, which is applied in the field of ultra-high-temperature calcination to prepare high-quality magnesia-calcium sand, can solve the problems of unsatisfactory waterproofing effect, reduced high-temperature performance, and decreased high-temperature performance of magnesia-calcium materials, etc., to achieve a reduction in pulverization rate , Bulk density increase, solve the effect of easy hydration

Active Publication Date: 2013-03-20
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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Problems solved by technology

However, it is not very ideal in terms of waterproofing effect: whether it is surface treatment, sealed packaging or production process control, it is necessary to isolate the product from the air as much as possible and prevent contact with water to achieve the purpose of waterproofing, but it is not fundamental To solve the problem of hydration, once the outer surface of the product is damaged, the protective layer that isolates the air will fall off, which will lead to rapid hydration of the product; at present, various additives can be added to improve the hydration performance. There are many kinds of such additives, including the following Generate liquid-based additives, such as Al 2 o 3 , Fe 2 o 3 、TiO 2 oxides, and CaF 2 , MgCl 2 and other salts, as well as solid solution-based additives such as CeO 2 、La 2 o 3 Such as rare earth oxides, the addition of these additives will inevitably lead to the decline of some high-temperature properties of magnesium-calcium materials, and the method of reducing its excellent high-temperature properties to obtain hydration resistance is obviously not ideal.

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  • Method for preparing high-quality calcium magnesia by superhigh-temperature calcination

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with specific embodiment:

[0010] The invention discloses a method for preparing high-quality magnesite-calcium sand by ultra-high temperature calcination, wherein dolomite and magnesite with a particle size of 50-80 mm are formulated into raw materials with a CaO content of 10%-20% and an MgO content of 80%-90% by weight percentage , put it into a ball mill tank for grinding and mixing, add water to digest and make pulp at the same time, dry the slurry into powder, add calcium lignosulfonate of 2-5% of the total powder weight to the powder, mix well, and press it into a brick under a pressure of 100-150MPa followed by calcination.

[0011] The calcination process is to raise the temperature to 1100°C at a rate of 7-10°C / min, keep it warm for 3-5 hours, and then continue to raise the temperature at a rate of 7-10°C / min to the final calcination temperature of 2000°C-2200°C. After 5-7 hours, vacuumize ...

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Abstract

The invention relates to the field of preparation of refractory materials, particularly a method for preparing high-quality calcium magnesia by superhigh-temperature calcination, which is characterized by comprising the following steps: preparing dolomite and magnesite into a raw material in which the CaO content is 15-20 wt% and the MgO content is 80-85%; adding the raw material into a ball milling tank, grinding and mixing, and meanwhile, adding water to carry out slaking and slurrying; and drying the slurry, adding calcium lignosulphonate, evenly mixing, pressing into green bricks, and calcining. The calcination process comprises the following steps: heating to 1100 DEG C, keeping the temperature for 3-5 hours, heating to the final calcination temperature of 2000-2200 DEG C, keeping the temperature for 5-7 hours, vacuumizing, cooling with water to 1000 DEG C, introducing protective hydrogen, and continuing cooling with water to room temperature. Compared with the prior art, the calcium magnesia has the advantages of high hydration resistance and high corrosion resistance, thereby basically solving the problem of high hydration tendency in the magnesium-calcium refractory material, and facilitating the storage, transportation, building and the like in future.

Description

technical field [0001] The invention relates to the field of preparation of refractory materials, in particular to a method for preparing high-quality magnesia-calcium sand by ultra-high temperature calcination. Background technique [0002] At present, in order to meet the needs of the development of the metallurgical industry and further develop the advantages of magnesium-calcium refractories, it is necessary to solve the hydration problem of magnesium-calcium refractories. In recent years, scholars at home and abroad have conducted extensive research on this issue, and developed many methods to improve the hydration of magnesium-calcium refractory materials. However, it is not very ideal in terms of waterproofing effect: whether it is surface treatment, sealed packaging or production process control, it is necessary to isolate the product from the air as much as possible and prevent contact with water to achieve the purpose of waterproofing, but it is not fundamental. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C04B35/66
Inventor 吴占德柏杉洪艳萍白城
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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