MgO-Cr2O3 ramming material for VOD (Vacuum Oxygen Decarburization) steel ladle safety liner

A technology of ramming material and steel ladle, which is applied in the field of ferrous metallurgy, can solve the problems of hidden dangers in the safety of ladles, complex construction technology, and restrictions on popularization and application, and achieves excellent strength and volume stability, broad market prospects, and low raw material prices. Effect

Active Publication Date: 2012-03-28
海城利尔麦格西塔材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former needs high-alumina bricks or magnesia bricks and fire mud to fill the joints. The cost of materials is high, the work is complicated, and the labor intensity is high. The strength has been reduced, but the requirements for raw materials are higher (only limited to SiO 2 -Al 2 o 3 system), and the construc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] A MgO-Cr for safety lining of VOD ladle 2 O 3 The ramming material is characterized in that it is composed of the following components in a proportion by weight: 50 parts of waste magnesia chrome bricks, 50 parts of magnesia, 3 parts of clay, 3 parts of sintering agent (boric acid); Respectively processed into products with particle sizes of 4~1mm, 1~0.074mm, and ≤0.074mm. The particle size composition is calculated in parts by weight: 4~1mm 45~55 parts; 1~0.074mm 25~35 parts; ≤0.074mm 15~25 Parts; the clay particle size is ≤0.074mm; mix the above-mentioned materials evenly, and then the finished product is prepared.

Example Embodiment

[0031] Example 2

[0032] A MgO-Cr for safety lining of VOD ladle 2 O 3 The ramming material is characterized in that it is composed of the following components in a proportion by weight: 75 parts of waste magnesia chrome bricks, 25 parts of magnesia, 5 parts of clay, 1 part of sintering agent (borax); Respectively processed into products with particle sizes of 4~1mm, 1~0.074mm, and ≤0.074mm. The particle size composition is calculated in parts by weight: 4~1mm 45~55 parts; 1~0.074mm 25~35 parts; ≤0.074mm 15~25 Parts; the clay particle size is ≤0.074mm; mix the above-mentioned materials evenly, and then the finished product is prepared.

Example Embodiment

[0033] Example 3

[0034] A MgO-Cr for safety lining of VOD ladle 2 O 3 The ramming material is characterized in that it is composed of the following components in a proportion by weight: 100 parts of waste magnesia chrome bricks, 15 parts of clay, and 10 parts of sintering agent (sodium hexametaphosphate); the waste magnesia chrome bricks are processed into a particle size of 4 For products of ~1mm, 1~0.074mm, ≤0.074mm, the particle size composition is calculated in parts by weight: 4~1mm 45~55 parts; 1~0.074mm 25~35 parts; ≤0.074mm 15~25 parts; clay particle size ≤0.074 mm; Mix the above-mentioned materials evenly and serve as a finished product.

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Abstract

The invention relates to an MgO-Cr2O3 ramming material for a VOD (Vacuum Oxygen Decarburization) steel ladle safety liner. The MgO-Cr2O3 ramming material is characterized by comprising the following components in parts by weight: 50-100 parts of waste magnesium-chromium bricks, 0-50 parts of magnesite, 3-15 parts of clay or bentonite, and 0.5-10 parts of agglutinant, wherein the waste magnesium-chromium bricks and the magnesite are respectively processed into products with the granularity of 4-1mm and 1-0.74mm and being not more than 0.07mm, and the granularity composition comprises 45-55 parts of processed products of 4-1mm, 25-35 parts of the processed products of 1-0.074mm, and 15-25 parts of the processed products being not more than 0.074mm in parts by weight; and all the materials are mixed uniformly to obtain a finished product which has the chemical components that MgO being not smaller than 60% and CrO3 being not smaller than 4.0%. The ramming material disclosed by the invention has the advantages of lower preparation cost, simplicity for construction, good integrity, favorable performance, stable and reliable quality, no restrains from territorial temperature, territorial humidity and other conditions, and good application effect.

Description

technical field [0001] The invention relates to a production technology and a construction method of a ramming material for masonry VOD ladle permanent lining in the field of ferrous metallurgy. Background technique [0002] At present, there are two main construction methods for VOD ladle safety lining in the world: one is the early wet bricking process, and the other is the pouring process adopted in recent years. The former needs high-alumina bricks or magnesia bricks and fire mud to fill the joints. The cost of materials is high, the work is complicated, and the labor intensity is high. The strength has been reduced, but the requirements for raw materials are higher (only limited to SiO 2 -Al 2 o 3 system), and the construction process is more complex (need to add molds, mixers, vibration motors and other equipment, increase the process of stirring, pouring, vibration, health preservation, baking), the entire cost is still high, and is restricted by regional humidity,...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 王相丰王生裘伟张义先
Owner 海城利尔麦格西塔材料有限公司
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