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Method for preparing magnesia-hercynite refractory material

A technology of iron-aluminum spinel and aluminum spinel is applied in the field of preparation of magnesia-iron-aluminum spinel refractory materials, which can solve the problems of poor hydration resistance, poor kiln skin property, poor thermal shock resistance, etc. Good thermal shock resistance, easy to hang kiln skin, good corrosion resistance to cement clinker

Inactive Publication Date: 2010-11-24
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesia-dolomite bricks have good chemical compatibility with cement clinker and excellent kiln-hanging properties, but poor thermal shock resistance and poor hydration resistance; magnesium-aluminum spinel bricks have good thermal shock resistance and erosion resistance Sex, but poor hanging kiln leather

Method used

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  • Method for preparing magnesia-hercynite refractory material
  • Method for preparing magnesia-hercynite refractory material
  • Method for preparing magnesia-hercynite refractory material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, the iron-aluminum spinel needed for the experiment was prepared by electromelting. The steps are as follows:

[0030] by FeO and Al 2 o 3 The powder ratio (weight percent) is 40:60 and weighed FeO powder and Al 2 o 3 powder raw material, and then the weighed Al 2 o 3 Pour 50% of the powder into the electric arc furnace, and place a piece of waste paper on the surface, and place the raw materials FeO powder and Al on the waste paper. 2 o 3 10% graphite block by powder gross weight and 5% strip-shaped iron filings by raw material gross weight, put down the electrode and make it contact with the graphite block, adjust the voltage to 110 volts, and feed the electric current. After 5 minutes, a violent light and heat generation occurs, and Al 2 o 3 The powder begins to melt slowly, the deeper the electrode is immersed in the liquid, the greater the current, the farther the electrode is from the liquid surface, the longer the arc is drawn, and then the remaini...

Embodiment 2

[0033] First, the iron-aluminum spinel needed for the experiment was prepared by electromelting. The steps are as follows:

[0034] by FeO and Al 2 o 3 Powder ratio (weight percent) is 60:40 and weigh FeO powder and Al 2 o 3 powder raw material, and then the weighed Al 2 o 3 Pour 50% of the powder into the electric arc furnace, and place a piece of waste paper on the surface, and place the raw materials FeO powder and Al on the waste paper. 2 o 3 10% graphite block by powder gross weight and 5% strip-shaped iron filings by raw material gross weight, put down the electrode and make it contact with the graphite block, adjust the voltage to 120 volts, and feed the electric current. After 5 minutes, a violent light and heat generation occurs, and Al 2 o 3 The powder begins to melt slowly, the deeper the electrode is immersed in the liquid, the greater the current, the farther the electrode is from the liquid surface, the longer the arc is drawn, and then the remaining 50%...

Embodiment 3

[0037] First, the iron-aluminum spinel needed for the experiment was prepared by electromelting. The steps are as follows:

[0038] by FeO and Al 2 o 3 Powder ratio (weight percent) is 50:50 and weigh FeO powder and Al 2 o 3 powder raw material, and then the weighed Al 2 o 3 Pour 50% of the powder into the electric arc furnace, and place a piece of waste paper on the surface, and place the raw materials FeO powder and Al on the waste paper. 2 o 3 10% graphite block by powder gross weight and 5% strip-shaped iron filings by raw material gross weight, put down the electrode and make it contact with the graphite block, adjust the voltage to 120 volts, and feed the electric current. After 5 minutes, a violent light and heat generation occurs, and Al 2 o 3 The powder begins to melt slowly, the deeper the electrode is immersed in the liquid, the greater the current, the farther the electrode is from the liquid surface, the longer the arc is drawn, and then the remaining 50%...

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Abstract

The invention discloses a method for preparing a magnesia-hercynite refractory material. The method comprises the following steps of: synthesizing the hercynite by using an electric smelting method; uniformly mixing the hercynite, magnesia and spent pulping liquor serving as raw materials according to a certain proportion, and sealing and baling the mixture; placing the prepared mixture into a mould for compression molding; drying the molded sample for 12 to 24 hours in a drying box; sintering the sample in a high temperature electric furnace; and cooling the sample to obtain the sintered magnesia-hercynite refractory material. The magnesia-hercynite refractory material prepared by the method has high kiln coating adherence, superior high temperature structural flexibility and superior cement clinker erosion resistance. The method has the advantages of simple process, high applicability and capability of being widely applied to various industries such as metallurgy, building materialsand the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, in particular to a preparation method of magnesium oxide iron aluminum spinel refractory material. technical background [0002] In the 1960s and 1970s, magnesia-chrome refractory materials were widely used in the firing zone of cement rotary kilns due to their good kiln skin and chemical corrosion resistance of cement clinker, but after use, magnesia-chrome refractory bricks The compound containing hexavalent chromium in it is a water-soluble carcinogen and will cause long-term pollution to the environment. Therefore, chromium-free refractories for cement rotary kilns are an inevitable trend. At present, the chromium-free refractory materials used in the firing zone of cement rotary kiln mainly include magnesia dolomite bricks and magnesia aluminum spinel bricks. Magnesia-dolomite bricks have good chemical compatibility with cement clinker and excellent kiln-hanging pro...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 肖国庆张君博石金辉
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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