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Preparation method of high-strength chrome-free brick for steel-making RH (Ruhstahl Hausen) vacuum refining slot

A technology for vacuum refining and chrome bricks is applied in the field of refractory materials for steelmaking RH vacuum refining tanks, which can solve the problems affecting the effective application of chrome-free bricks, poor corrosion resistance, and easy powdering and fracture, so as to enhance corrosion resistance. and thermal shock performance, make up for poor corrosion resistance and prolong service life

Active Publication Date: 2015-07-22
鞍山市和丰耐火材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many manufacturers of chrome-free bricks in China, basically using magnesia and spinel as the main material, supplemented by various additives and binders, and drying at low temperature to prepare chrome-free bricks; the common disadvantages of their products are: The corrosion resistance is not good during high temperature use, and the strength is low. Especially during small and medium repairs, it is easy to pulverize and break, and unnecessary loss is large, which affects the effective application of chrome-free bricks.

Method used

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  • Preparation method of high-strength chrome-free brick for steel-making RH (Ruhstahl Hausen) vacuum refining slot
  • Preparation method of high-strength chrome-free brick for steel-making RH (Ruhstahl Hausen) vacuum refining slot
  • Preparation method of high-strength chrome-free brick for steel-making RH (Ruhstahl Hausen) vacuum refining slot

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preparation example Construction

[0040] The preparation method of the high-strength chrome-free brick, the steps are as follows;

[0041] 1) Make composite additives, which are made of the following ingredients in proportion by weight: 0-2 parts of boron nitride powder, 0-2 parts of ferrosilicon nitride; accurately weigh the above raw materials according to the weight ratio, and put them into the stirring Grinding and co-grinding, stirring for 10-15 minutes, closed for use;

[0042] 2) Make a composite binder, which is made of the following ingredients in proportion by weight: 2.5-5 parts of pulp waste liquid, 1-2 parts of sodium lignosulfonate powder; accurately weigh the above raw materials according to the weight ratio, put Stir in a mixing bucket for 10-15 minutes, close and set aside;

[0043] 3) First put 6-1mm low-silicon fused magnesia, 1-0.088mm low-silicon fused magnesia and / or fused magnesia-aluminum spinel and zirconia fiber into the high-speed In the kneader, mix for 2-6 minutes at a time; add ...

Embodiment 1

[0051] [Example 1] Preparation of a chrome-free brick with excellent corrosion resistance

[0052] 1) Making composite additives, made of the following ingredients in proportions by weight: 0.85 parts of boron nitride powder, 1.15 parts of ferrosilicon nitride; the raw materials were accurately weighed according to the proportions by weight, and put into a stirring mill for a total Grind and stir for 10 minutes, seal and set aside;

[0053] 2) Make a composite binder, which is made of the following components in parts by weight: 3.1 parts of pulp waste liquid, 0.9 parts of sodium lignosulfonate powder; accurately weigh the raw materials according to the parts by weight, and put them into agitation Stir in the bucket for 12 minutes, close it for use;

[0054] 3) First, 35 parts of 6-1mm low-silicon fused magnesia, 15 parts of 1-0.088mm low-silicon fused magnesia, 10 parts of 1-0.088mm fused magnesia-aluminum spinel according to the weight ratio 1 part of zirconia fiber, put i...

Embodiment 2

[0057] [Example 2] Preparation of a high-strength chrome-free brick

[0058] 1) Making composite additives, made of the following ingredients in proportions by weight: 0.75 parts of boron nitride powder, 1.25 parts of ferrosilicon nitride; the raw materials were accurately weighed according to the proportions by weight, and put into a stirring mill for a total Grind and stir for 12 minutes, seal and set aside;

[0059] 2) Make a composite binder, which is made of the following ingredients in proportion by weight: 3.2 parts of pulp waste liquid, 1 part of sodium lignosulfonate powder; accurately weigh the raw materials according to the proportion by weight, and put them into agitation Stir in the barrel for 15 minutes, close it for use;

[0060] 3) First, 35 parts of 6-1mm low-silicon fused magnesia, 15 parts of 1-0.088mm low-silicon fused magnesia, 10 parts of 1-0.088mm fused magnesia-aluminum spinel according to the weight ratio Parts, 1.5 parts of zirconia fiber, put into ...

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Abstract

The invention relates to a preparation method of a high-strength chrome-free brick for a steel-making RH (Ruhstahl Hausen) vacuum refining slot. The high-strength chrome-free brick comprises the raw materials: one or two of 6-1 mm low silicon fused magnesia, 1-0.088mm low silicon fused magnesia and fused magnesia-alumina spinel, one or two of 180-mesh large crystal fused magnesite and fused magnesia-alumina spinel, fused magnesia-alumina spinel micro powder, one or two of modified graphite and carbon black, a boron nitride and ferro-silicon nitride composite additive, a paper pulp and sodium lignosulphonate composite bonding agent and polycrystalline zirconia fibers. The raw materials are stirred in special stirring equipment according to specified proportions and charging sequence and are subject to compression molding, drying, checking and the like to complete a preparation process. Compared with the prior art, the preparation method has the beneficial effects that as a carbon-containing material and an efficient antioxidant are added into a substrate, the high temperature corrosion-resistant property of the chrome-free brick is greatly improved; as the zirconia fibers are added, the high temperature hot strength and the normal temperature cold repair strength are obviously enhanced and the service life of a working lining is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of refractory materials for steelmaking RH vacuum refining tanks, in particular to a method for preparing high-strength chromium-free bricks for steelmaking RH vacuum refining tanks. Background technique [0002] The RH furnace is currently the most widely used equipment in the secondary refining process of steelmaking. Because the RH furnace works in the environment of high temperature, vacuum and frequent temperature rise and fall, the requirements for lining refractory materials are very high, not only high temperature resistance is required, but also good slag resistance, thermal shock resistance and stability anti-scouring properties, etc. Magnesia-chrome bricks have been used in RH furnaces at home and abroad because of their high refractoriness, high temperature strength, strong resistance to alkaline slag erosion, certain ability to resist acid slag erosion, and excellent thermal shock stability. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 孙逊李涛
Owner 鞍山市和丰耐火材料有限公司
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