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Pleonaste-hercynite bricks and preparation method thereof

A technology of iron-aluminum spinel and spinel bricks is applied in the field of chromium-free basic refractory materials, which can solve the problems of environmental pollution and difficult to meet product performance, and achieves good alkali corrosion resistance, low production cost, and physical properties. and structural flexibility

Active Publication Date: 2011-06-22
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 material of this product contains chromium, which will cause pollution to the environment after use. The product is mainly used as a rotary kiln for zinc smelting, and the product performance cannot meet the requirements of high-temperature refractory bricks in existing cement kilns.

Method used

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  • Pleonaste-hercynite bricks and preparation method thereof
  • Pleonaste-hercynite bricks and preparation method thereof
  • Pleonaste-hercynite bricks and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Magnesia-iron-iron-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 iron-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 .

[0024] Among them, the weight composition of high iron magnesia is: MgO 85%, Fe 2 o 3 10%, other impurities 5%; the weight composition of iron-aluminum spinel is: FeO 42%, Al 2 o 3 56%, other impurities 2%.

[0025] Preparation method: Mix the raw materials with a wet mill, shape them with a hydraulic press, put the formed bricks into a drying kiln, dry them at 140°C for 20 hours to make the moisture content ≤0.5%, and then heat them to 1620°C. and kept...

Embodiment 2

[0028] Embodiment 2: Magnesia-iron-iron-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% of magnesia, 12% of iron-aluminum spinel less than 3mm, and 3% of the total weight of the above-mentioned raw materials are added with waste sulfurous acid pulp. The density of the waste sulfurous acid pulp is 1.3g / cm 3 .

[0029] The weight composition of high iron magnesia is: MgO 90%, Fe 2 o 3 8%, other impurities 2%; the weight composition of iron-aluminum spinel is: FeO 40%, Al 2 o 3 58%, other impurities 2%.

[0030] Preparation method: Mix the raw materials with a wet mill, shape them with a friction press, put the formed bricks into a drying kiln, dry them at 110°C for 24 hours, and heat them to 1650°C. And keep it at this temperature for 3h to burn , the main components of the product are: MgO 83...

Embodiment 3

[0033] Embodiment 3: Magnesia-iron-iron-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 of less than 2mm, and high-iron magnesia of less than 0.088mm Magnesia 31%, 5~3mm iron-aluminum spinel 12%, 3 .

[0034] Among them, the weight composition of high iron magnesia is: MgO 80%, Fe 2 o 3 15%, other impurities 5%; the weight composition of ferroaluminum spinel is: FeO 44%, Al 2 o 3 54%, other impurities 2%.

[0035] 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 17 hours, heated to 1680°C, and fired at this temperature for 5 hours , the main components of the obtained product are: MgO76%, Al 2 o 3 14%, (Fe 2 o 3 +FeO) 9%.

[0036] Its performance indicators are shown in Table 4 below:

[0037]

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Abstract

The invention relates to pleonaste-hercynite bricks and a preparation method thereof. The pleonaste-hercynite bricks are prepared from the following raw materials in percentage by weight: 55 to 98 percent of high-iron magnesia with a particle size of less than or equal to 5 millimeters, 2 to 45 percent of hercynite with a particle size of less than or equal to 5 millimeters and 2 to 4 percent of binding agent. The preparation method comprises: weighing raw materials; rolling wet materials; forming; drying; firing; drying the fired bricks at 110 to 160 DEG C for 8 to 24 hours; heating the bricks to 1,550 to 1,700 DEG C; keeping the temperature for 3 to 15 hours; and taking the bricks out of kiln. The pleonaste-hercynite bricks have high performance, high refractoiness under load, high thermal shock resistance, high alkaline corrosion resistance and high kiln-crust sticking performance, are free from hydration and easy to transport, are ideal materials for the high-temperature zone of acement kiln and can be used in place of the conventional magchrome refractory 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-iron-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 good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 翟耀杰刘锡俊袁林王俊涛叶亚红胡世平陈卫敏陈松林赵洪亮袁建军徐琳琳刘晓磊
Owner 河南瑞泰耐火材料科技有限公司
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