High-performance magnesium-aluminum-chromium composite spinel brick and manufacturing method thereof

A technology of spinel brick and manufacturing method, which is applied in the field of refractory materials, can solve the problems of affecting slag resistance permeability and erosion performance, damage of magnesia-chrome bricks, and reduction of density of magnesia-chrome bricks, etc., to achieve enhanced direct bonding ability, porosity The effect of low rate and lower sintering temperature
CN102731121AActive Publication Date: 2012-10-17LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
Publication Date
2012-10-17

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Abstract

The invention relates to a high-performance magnesium-aluminum-chromium composite spinel brick for RH refining furnace dip pipes and non-ferrous smelting furnaces. The high-performance magnesium-aluminum-chromium composite spinel brick is characterized by comprising the following raw materials: 14.0-20.0 parts of low-chromium fused magnesium chromium sand (6-8% of Cr2O3, at least 78% of MgO), 71.6-82.0 parts of high-purity fused magnesite, 2.0-4.4 parts of nano Cr2O3 powder, 2.0-4.0 parts of uf-Al2O3 micropowder and 2-4 parts of binder. The manufacturing method comprises the following steps: mixing, molding, drying, firing and the like. The magnesium-aluminum-chromium composite spinel brick provided by the invention has the advantages of high sintering tendency, high crystal compactness, low porosity (at most 10%), high compressive strength (at least 100 MPa), high thermal shock stability (at least 18 times by 1100 DEG C water cooling) and the like. The Cr2O3 content of the product isat most 6%, thereby reducing the Cr2O3 content in the brick, lowering the production cost and finally effectively reducing the environmental pollution of waste magnesium-chromium bricks after use.
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Description

technical field

[0001] The invention belongs to the field of refractory materials, and in particular relates to a high-performance magnesium-aluminum-chromium composite spinel brick for RH refining furnace dipping tubes and non-ferrous smelting furnaces and a manufacturing method thereof. Background technique

[0002] As we all know, magnesia-chrome bricks have excellent high-temperature strength, high-temperature volume stability, thermal shock resistance, erosion resistance, and erosion resistance, and are widely used in metal smelting and cement rotary kilns. In recent years, due to many reasons such as the price increase of chromium ore, the increase of production cost, and the replacement of new material refractory materials, the consumption of magnesia-chrome bricks has decreased year by year; the most fundamental reason is that the discarded magnesia-chrome bricks will produce Cr+6, which is harmful to the human body. Harmful, causing environmental pollution, so all c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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