Mafic-magnalium compound spinel brick and preparation method thereof

A magnesia-aluminum spinel and spinel brick technology, which is applied in the field of magnesia-iron-magnesium-aluminum composite spinel bricks and their preparation, can solve problems such as unsatisfactory performance and environmental pollution, and achieve stable product performance and alkali resistance. Good aggressiveness and long service life

Inactive Publication Date: 2011-04-20
河南瑞泰耐火材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials of the product contain chromium, which will cause pollution to the environment after use. The product is mainly used in zinc smelting rotary kilns, and its performance cannot meet the requirements of high-temperature refractory bricks in existing cement kilns.

Method used

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  • Mafic-magnalium compound spinel brick and preparation method thereof
  • Mafic-magnalium compound spinel brick and preparation method thereof
  • Mafic-magnalium compound spinel brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Magnesium-iron-magnesium-aluminum composite spinel bricks for cement kiln, expressed in weight percentage, raw materials are: 5-3mm high-iron magnesia accounts for 34%, and less than 2mm high-iron magnesia accounts for 27%, less than 0.088mm The high-iron magnesia accounts for 33%, and the magnesia-aluminum spinel less than 3mm accounts for 6%. In addition, 2-4% of the total weight of the above-mentioned raw materials is added as a binder. The density of the sulfurous acid pulp waste liquid is 1.2 g / cm 3 .

[0021] Among them, the weight composition of high iron magnesia is: MgO 85%, Fe 2 o 3 10%, other impurities 5%; the weight composition of magnesium aluminum spinel is: MgO 30%, Al 2 o 3 68%, other impurities 2%.

[0022] Preparation method: Mix the raw materials with a wet mill, shape them with a hydraulic press, put the shaped bricks into a drying kiln, dry them at 160°C for 8 hours to make the moisture content ≤0.5%, then heat them to 1660°C, a...

Embodiment 2

[0025] Embodiment 2: Magnesium-iron-magnesium-aluminum composite spinel bricks for cement kilns, expressed in weight percentage, raw materials are: 32% of high-iron magnesia of 5-3mm, 25% of high-iron magnesia of less than 2mm, and high-iron magnesia of less than 0.088mm 31% magnesia, 12% magnesia-aluminum spinel less than 3mm, additionally add sulfurous acid pulp waste liquid accounting for 3% of the total weight of the above raw materials, the density of sulfurous acid pulp waste liquid is 1.3g / cm 3 .

[0026] The weight composition of high iron magnesia is: MgO 90%, Fe 2 o 3 8%, other impurities 2%; the weight composition of magnesium aluminum spinel is: MgO 35%, Al 2 o 3 62%, other impurities 3%.

[0027] Preparation method: mix the raw materials with a wet mill, shape them with a friction press, put the shaped bricks into a drying kiln, dry them at 110°C for 24 hours, make the moisture content ≤0.5%, then heat them to 1700°C, and Burning under heat preservation for ...

Embodiment 3

[0030] Embodiment 3: Magnesium iron-magnesium aluminum composite spinel bricks for cement kiln, expressed in weight percentage, raw materials are: 27% of high iron magnesia of 5~3mm, 20% of high iron magnesia less than 2mm, less than 0.088mm of high iron magnesia Magnesia 31%, 5~3mm magnesia-aluminum spinel 12%, 3 .

[0031] Among them, the weight composition of high iron magnesia is: MgO 80%, Fe 2 o 3 15%, other impurities 5%; the weight composition of magnesium aluminum spinel is: MgO 49%, Al 2 o 3 50%, other impurities 1%.

[0032] Preparation method: The raw materials are mixed by a wet mill, shaped by a friction press, put into a drying kiln, dried at 130°C for 12 hours, heated to 1680°C, and kept at this temperature for 12 hours to obtain the product The main components are: MgO76%, Al 2 o 3 15%, Fe 2 o 3 5%.

[0033] Its performance indicators are shown in Table 4 below:

[0034]

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Abstract

The invention relates to a mafic-magnalium compound spinel brick and a preparation method thereof. The raw materials comprise 20-55% of high iron magnesia sand with granularity of 5-3mm, 10-45% of high iron magnesia sand with granularity of less than 2mm, 20-45% of high iron magnesia sand with granularity of less than 0.088mm, 4-35% of magnalium spinel with granularity of not more than 5mm, and 2-4% of bonding agent. The preparation method comprises the following steps of: weighing the raw materials, wet milling, shaping, drying and sintering; drying the brick blank for 8-24h at the temperature of 110-160 DEG C; heating to the temperature of 1600-1700 DEG C; warming for 3-12h at the temperature of 1600-1700 DEG C and taking out. The product comprises the main components of 73-95% of MgO, 3-15% of Al2O3 and 2-12% of Fe2O3. The mafic-magnalium compound spinel brick has good product performance, high load softening temperature, high pressure resistance intensity, good thermal shaking stability and good alkali corrosion resistance, and is an ideal material for cement kiln high temperature belts. The mafic-magnalium compound spinel brick can substitute the current magnesia-chromite fire-proof material and is a new environmentally-friendly alkali fire-proof material.

Description

technical field [0001] The invention relates to a chromium-free basic refractory material used in the high temperature zone of a cement rotary kiln, in particular to a magnesium-iron-magnesium-aluminum composite spinel brick and a preparation method thereof. Background technique [0002] After years of development, the refractory materials used in the high temperature zone of cement kiln have evolved from the earliest clay bricks and magnesia chrome bricks to the current magnesia alumina spinel bricks, magnesia zirconium bricks and magnesia dolomite bricks. Among them, magnesia-chrome bricks have good properties such as load softening temperature, high-temperature strength, corrosion resistance and thermal shock stability, but the bricks will remain Cr after use. 6+ , causing pollution to the environment; magnesia-alumina spinel bricks have excellent corrosion resistance, but poor kiln skin performance; and magnesia-zirconium bricks have excellent thermal shock stability and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 袁林刘锡俊叶亚红王俊涛陈松林胡世平翟耀杰陈卫敏刘昭毛恩亮陈磊刘晓磊马孝宽徐琳琳
Owner 河南瑞泰耐火材料科技有限公司
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