Production method of magnesium-aluminum spinel bricks

A technology of magnesia-alumina spinel brick and its production method, which is applied in the production field of magnesia-alumina spinel brick, can solve the problem within 3-4 months, the longest time is no more than 6 months, and needs to be replaced several times a year, etc. problems, to achieve the effects of reducing the number of kiln shutdown maintenance, good thermal shock resistance, and good corrosion resistance

Active Publication Date: 2012-04-04
郑州真金耐火材料有限责任公司
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Problems solved by technology

However, due to the constraints of raw materials, production process, production equipment and production technology, the service life of ordinary spinel bricks in the transition zone of cement rotary kiln is generally 3-4 months, and the longest time is no more than 6 months. , the kiln lining in the transition zone needs to be replaced several times a year, and this problem has always been a pain in the heart of cement manufacturers

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  • Production method of magnesium-aluminum spinel bricks

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Embodiment Construction

[0014] The production method of magnesia-aluminum spinel brick of the present invention, it comprises the following steps:

[0015] Step 1: Use a crocodile crusher or a cone crusher to crush high-purity magnesia, fused magnesia, and spinel. After crushing the magnesia pellets in a ball mill, weigh the magnesium with a particle size of 5-3mm by weight. 3 parts of sand material, 2.5 parts of magnesia material with a particle size of 0.075mm<3mm, 3.5 parts of magnesia fine powder with a particle size of ≤0.075mm; 1 part of spinel material with a particle size of 5-3mm, and 1 part of spinel material with a particle size of <3mm ;

[0016] Step 2: Mix the above materials evenly and place them in a wet mill, add a lignin solution with a weight of 4-5% of the total material weight and wet mill them for 15-25 minutes, then place them in a press with a pressure greater than 630KN for molding, and make semi-finished products;

[0017] The third step: put the semi-finished product in t...

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Abstract

The invention discloses a production method of magnesium-aluminum spinel bricks. The production method comprises the following steps of: (1) weighting 9 parts of magnesia material and 2 parts of spinel material in parts by weight; (2) uniformly mixing and placing the materials in an edge runner-wet mill; adding a lignin solution accounting for 4-5 % by weight of the total materials; placing in a press with the pressure larger than 630KN to prepare a semi-finished product; (3) placing the semi-finished product in a dryer to dry; entering a tunnel kiln to sinter at the oxidizing atmosphere condition of 1730 DEG C; and keeping the temperature for 10-12h to obtain a finished brick product. The magnesium aluminum spinel bricks prepared by the method can reach the service life up to over 1 year can keep synchronous operation with a calcining zone kiln liner and reduce the maintenance frequency by halting the kiln. The product has good anti-corrosion performance and anti-thermal-shock stability, improves the thermal-shock stability (1100 DEG C, water-cooling) by more than one time than similar products and reaches a load softening temperature of 50-100 DEG C higher than that of common spinel bricks, magnesium bricks and aluminum-magnesium bricks.

Description

technical field [0001] The invention relates to a production method of spinel bricks used in cement production kilns, in particular to a production method of magnesia-chrome spinel bricks used in transition zones of dry-process cement kilns. Background technique [0002] The transition zone of large-scale dry-process cement kiln is in a thermally unstable state, and the kiln skin frequently alternates, so it cannot be attached to a solid thick kiln skin, which becomes the weak link of the new dry-process kiln. It is favored for hanging thin and stable kiln skins. However, due to the constraints of raw materials, production process, production equipment and production technology, the service life of ordinary spinel bricks in the transition zone of cement rotary kiln is generally 3-4 months, and the longest time is no more than 6 months. , The kiln lining in the transition zone needs to be replaced several times a year. This problem has always been a pain in the heart of ceme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/66C04B35/443
Inventor 宋金标宋禄峰宋彩红宋马峰卢中立樊建令郭英超付鸿正樊召峰周红丽
Owner 郑州真金耐火材料有限责任公司
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