Magnesia-hercynite brick and preparation method thereof

A technology of magnesium-iron-aluminum spinel and iron-aluminum spinel, which is applied in the field of magnesium-iron-aluminum spinel bricks and its preparation, can solve the problems of large volume effect, unfavorable volume stability, etc., and achieve the effect of solving pollution problems

Inactive Publication Date: 2010-10-06
SHANDONG SHENGCHUAN CERAMICS +3
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Problems solved by technology

In this patent, due to the wide range of iron content in iron-aluminum spinel, the material may contain excess FeO or Al 2 o 3 , resulting in a large volume effect of iron-aluminum spinel bricks during firing or use, which is not conducive to volume stability

Method used

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  • Magnesia-hercynite brick and preparation method thereof

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Experimental program
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Effect test

Embodiment

[0022] Add magnesia and pre-synthesized ferrous aluminum spinel into the mixer according to the proportion of chemical composition, and then add 2-4% of the above mixture as a binder, the binder is dextrin, pulp waste liquid, starch , methyl cellulose, resin or any combination of several, after mixing evenly, press on a 600-1200 ton press to form. After drying at 110°C, it is fired in a high-temperature kiln at 1400-1700°C to obtain chromium-free magnesium-iron-aluminum spinel bricks. The brick can be directly used in the firing zone of the cement rotary kiln.

[0023] Embodiment and product performance index situation are shown in Table 1. Among them, the maximum particle size of magnesia is 5mm; the maximum particle size of iron-aluminum spinel is 3mm. The chemical weight composition of the product is Fe 2 o 3 2.5-9.6%, Al 2 o 3 2.9-12%, MgO 76-93%.

[0024] Table 1, embodiment and product performance index situation table

[0025]

[0026] Among the four exampl...

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Abstract

The invention relates to a magnesia-hercynite brick and a preparation method thereof, belonging to the technical field of refractory materials. The magnesia-hercynite brick comprises the following chemical components in weight percent: 2.5 to 9.6% of Fe2O3, 2.9 to 12% of Al2O3 and 76-93% of MgO, the main crystalline phase displayed by XRD spectrum line is FeO.Al2O3. The preparation method comprises the steps of additionally adding a binding agent, carrying out compression moulding, drying, and baking at high temperature to obtain the magnesia-hercynite brick, which is simple and practicable. The magnesia-hercynite brick can be applied to the fields suitable to high temperature, in particular to clinkering zones of a novel rotary kiln utilizing a dry line method, thus solving the problem of Cr6 + pollution caused by the use of magnesite-chrome bricks in clinkering zones.

Description

technical field [0001] The invention relates to a magnesium-iron-aluminum spinel brick and a preparation method thereof, belonging to the technical field of refractory materials. Background technique [0002] Because magnesia-chrome materials have good high-temperature performance and excellent kiln skin-hanging performance, magnesia-chrome bricks have become the main material for the firing zone of cement rotary kilns in new dry-process cement production lines. Due to the use of magnesia-chrome bricks, part of the chromium in the bricks will change from Cr 3+ into highly toxic and carcinogenic Cr 6+ , destroy the environment and affect people's life and health. [0003] Therefore, chromium-free is the trend and development direction of alkaline materials for cement kilns. In recent years, a lot of work has been done at home and abroad to find alternative materials for magnesia-chrome bricks, but the results are not ideal. The substitute material is mainly dolomite refra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622F27B7/28
CPCC04B2235/72C04B2235/77C04B2235/656C04B2235/5427C04B35/0435C04B2235/3272F27D1/0006C04B2235/3217C04B2235/5436C04B2235/5472
Inventor 陈俊红封吉圣郑本水石志民赵兵朱波孙加林李勇薛文东
Owner SHANDONG SHENGCHUAN CERAMICS
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