Chromium-free magnesium composite brick used for VOD furnace and preparation method thereof

A composite brick, chrome-magnesium technology, applied in the field of refractory materials, can solve problems such as unsatisfactory service life, achieve good environmental protection, promote sintering, improve thermal shock stability and chemical corrosion resistance.

Active Publication Date: 2017-08-04
海城利尔麦格西塔材料有限公司
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, fired magnesia-chrome bricks are commonly used in VOD ladles, and some

Method used

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
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] A method for preparing chromium-free magnesia composite brick for VOD furnace, the specific method is as follows:

[0036] 1) The large crystalline magnesia in parts by weight is crushed in a crusher to prepare a fine powder raw material with a particle size of 200 mesh;

[0037] 2) Premix the 200-mesh large crystalline magnesia with the above weight parts of yttrium oxide and dicalcium silicate in the mixer, and the premixing time is not less than 2 hours;

[0038] 3) Briquetting and sintering the uniformly mixed raw materials pre-mixed in step 2) to form a bulk raw material, the sintering temperature is 1550°C-1560°C;

[0039] 4) Put the bulk raw material obtained after sintering into the crusher again for crushing, and sieving and finely grind the raw materials to make 3mm

[0040] The weight parts of the four kinds of granular raw materials are as follows: 10-15 parts of...

Example Embodiment

[0044] Example 1:

[0045] A chromium-free magnesia composite brick for VOD furnace is prepared from the following raw materials in parts by weight:

[0046] Aggregate: 51 parts of large crystalline magnesia;

[0047] Ingredients: 3 parts of calcined alumina superfine powder, yttrium oxide (Y 2 O 3 ) 1 part, 3 parts of dicalcium silicate, 3 parts of fused zirconia fine powder with a particle size of 200 mesh;

[0048] Binder: 2 parts.

[0049] The binding agent is a mixture of phenolic resin and sodium silicate, and the weight ratio of phenolic resin to sodium silicate is 2:1.

[0050] A method for preparing chromium-free magnesia composite brick for VOD furnace, the specific method is as follows:

[0051] 1) The large crystalline magnesia in parts by weight is crushed in a crusher to prepare a fine powder raw material with a particle size of 200 mesh;

[0052] 2) Premix the large crystalline magnesia with a particle size of 200 mesh with the above weight parts of yttrium oxide and dicalci...

Example Embodiment

[0059] Example 2:

[0060] A chromium-free magnesia composite brick for VOD furnace is prepared from the following raw materials in parts by weight:

[0061] Aggregate: 93 parts of large crystalline magnesia;

[0062] Ingredients: 7 parts of calcined alumina superfine powder, yttrium oxide (Y 2 O 3 ) 2 parts, 5 parts of dicalcium silicate, 7 parts of fused zirconia fine powder with a particle size of 200 mesh;

[0063] Binder: 4 parts.

[0064] The binding agent is a mixture of phenolic resin and sodium silicate, and the weight ratio of phenolic resin to sodium silicate is 2:1.

[0065] A method for preparing chromium-free magnesia composite brick for VOD furnace, the specific method is as follows:

[0066] 1) The large crystalline magnesia in parts by weight is crushed in a crusher to prepare a fine powder raw material with a particle size of 200 mesh;

[0067] 2) Premix the large crystalline magnesia with a particle size of 200 mesh with the above weight parts of yttrium oxide and dicalc...

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
Login to view more

PUM

PropertyMeasurementUnit
Granularityaaaaaaaaaa
Granularityaaaaaaaaaa
Granularityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a chromium-free magnesium composite brick used for a VOD furnace and a preparation method thereof. The preparation method comprises the following steps: firstly sintering macrocrystalline magnesium sand with yttrium oxide and dicalcium silicate at the temperature of about 1550 DEG C, firstly preparing a pre-prepared material with excellent high temperature mechanical properties by adopting a presintering method, taking the pre-prepared materials in different grain gradations as an aggregate of a mending material, also adopting electrically smelted zirconia and calcined alumina as additives to make an unfired chromium-free magnesium composite brick for replacing an existing fired magnesium chromium brick to be used, pollution of the magnesium chromium brick to the environment is avoided, and thermal shock resistance and high temperature bending strength of a refractory material used for the VOD furnace are improved, so that the service life of the VOD furnace is guaranteed.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a chromium-free magnesia composite brick for a VOD furnace and a preparation method thereof. Background technique [0002] Refractory materials for refining outside the furnace, including tar-fired magnesia-dolomite bricks and magnesia-carbon bricks, high-quality pre-reaction magnesia-chrome bricks and fused rebonded magnesia-chrome bricks. The study found that during the baking and resting period of the ladle, the surface of the carbon-containing lining brick was seriously decarburized, resulting in rapid damage to the lining. The use of magnesia-chrome bricks can effectively improve the performance and service life of refining furnace lining bricks because of their excellent corrosion resistance and peeling resistance. [0003] But with Cr 2 o 3 In the oxidizing environment of magnesia-chromium bricks, the trivalent Cr in it will be partially converted into hexavalent chr...

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
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C04B35/66C04B35/043C04B35/622C04B35/63C04B35/634C04B35/626
CPCC04B35/0435C04B35/622C04B35/62645C04B35/6316C04B35/63476C04B2235/3217C04B2235/3225C04B2235/3454C04B2235/763
Inventor 杨敬彪王新杰张义先尹斌金钊王健骁
Owner 海城利尔麦格西塔材料有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap