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

Active Publication Date: 2012-10-17
LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

and Cr 2 o 3 Volatility at high temperature leads to a decrease in the density of magnesia-chrome bricks, which affects its slag resistance, permeability and erosion properties, etc. These factors lead to the damage of magnesia-chrome bricks
Under such harsh working conditions, other types of refractory materials cannot replace
As pointed out in the 3rd International Symposium on Refractory Materials, for refractory materials refined outside the furnace, magnesium-chromium products are still the most corrosion-resistant, and they cannot be replaced in non-ferrous metal smelting

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high-performance magnesium-aluminum-chromium composite spinel brick is made of the following raw materials in proportion by weight:

[0035] 8 parts of 5mm~3mm fused magnesia;

[0036] 27 parts of 3mm~1mm fused magnesia;

[0037] ≤ 1mm fused magnesia 24 parts;

[0038] ≤0.074mm fused magnesia 23 parts;

[0039] 7 parts of 3mm~1mm low-chromium fused magnesia-chrome sand;

[0040] ≤ 1mm 4 parts of low-chromium fused magnesia-chrome sand;

[0041] 3 parts of ≤0.074mm low-chromium fused magnesia-chrome sand;

[0042] 10nm~50nm Nano Cr 2 o 3 2 parts powder;

[0043] 2 o 3 Micropowder 2 parts;

[0044] 2 ~ 4 parts of binder;

[0045] The binder is sulfurous acid pulp waste liquid.

[0046] A method for manufacturing high-performance magnesia-aluminum-chromium composite spinel bricks, comprising the steps of:

[0047] 1) Preparation of low-chromium fused magnesia-chrome sand: 15.4 parts of chromium ore powder and 84.6 parts of...

Embodiment 2

[0057] A high-performance magnesium-aluminum-chromium composite spinel brick is made of the following raw materials in proportion by weight:

[0058] 8 parts of 5mm~3mm fused magnesia;

[0059] 26 parts of 3mm~1mm fused magnesia;

[0060] 23 parts of 1mm~0mm fused magnesia;

[0061] ≤0.074mm fused magnesia 19.8 parts;

[0062] 8 parts of 3mm~1mm low chromium fused magnesia chrome sand;

[0063] 5 parts of 1mm~0mm low chromium fused magnesia chrome sand;

[0064] 4 parts of ≤0.074mm low-chromium fused magnesia-chrome sand;

[0065] 10nm~50nm Nano Cr 2 o 3 3.2 parts of powder;

[0066] 2 o 3 3 parts of micronized powder;

[0067] 2 ~ 4 parts of binder;

[0068] The binder is sulfurous acid pulp waste liquid.

[0069] A method for manufacturing high-performance magnesia-aluminum-chromium composite spinel bricks, comprising the steps of:

[0070] 1) Preparation of low-chromium fused magnesia-chrome sand: 15.4 parts of chromium ore powder and 84.6 parts of lightly ...

Embodiment 3

[0080] A high-performance magnesium-aluminum-chromium composite spinel brick is made of the following raw materials in proportion by weight:

[0081] 8 parts of 5mm~3mm fused magnesia;

[0082] 25 parts of 3mm~1mm fused magnesia;

[0083] ≤ 1mm fused magnesia 22 parts;

[0084] ≤0.074mm fused magnesia 16.6 parts;

[0085] 9 parts of 3mm~1mm low chromium fused magnesia chrome sand;

[0086] 6 parts of ≤ 1mm low-chromium fused magnesia-chrome sand;

[0087] ≤0.074mm low chromium fused magnesia chrome sand 5 parts;

[0088] 10nm~50nm Nano Cr 2 o 3 4.4 parts of powder;

[0089] 2 o 3 4 parts of fine powder;

[0090] 2 ~ 4 parts of binder;

[0091] The binder is sulfurous acid pulp waste liquid.

[0092] A method for manufacturing high-performance magnesium-aluminum-chromium composite spinel bricks, comprising the steps of:

[0093] 1) Preparation of low-chromium fused magnesia-chrome sand: 15.4 parts of chromium ore powder and 84.6 parts of lightly burned magnesiu...

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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.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 苏广深杨永刚
Owner LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
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