CA6-MA-Cr2O3-Al2O3 ladle lining castable and preparation method thereof

A ca6-ma-cr2o3-al2o3, castable technology, applied in the field of ladle lining castables, can solve the problem that lightweight refractories cannot meet the requirements of energy saving, emission reduction and slag corrosion resistance at the same time, can not meet the requirements of green environmental protection, and do not have Promotion potential and other issues to achieve the effect of improving slag erosion resistance, excellent slag erosion resistance, and excellent penetration resistance

Active Publication Date: 2019-05-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Chromium corundum spinel castable and its production method" (CN103121851A) patent technology, also with Cr 2 o 3 Directly introducing corundum-spinel castables can further improve the slag erosion resistance and permeability of the material, but it will inevitably form hexavalent chromium during production and use, which cannot meet the requirements of green environmental protection and has no promotion potential
[0007] Overall, it can be seen that the currently disclosed lightweight refractory materials cannot meet the requirements of energy saving, emission reduction and slag erosion resistance at the same time.
In addition, under the requirement of environmental protection, directly introduce Cr into the ladle castable 2 o 3 Also facing the hazards of hexavalent chromium environmental pollution

Method used

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  • CA6-MA-Cr2O3-Al2O3 ladle lining castable and preparation method thereof
  • CA6-MA-Cr2O3-Al2O3 ladle lining castable and preparation method thereof
  • CA6-MA-Cr2O3-Al2O3 ladle lining castable and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] a CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Castable for ladle lining and preparation method thereof. The preparation method described in this embodiment is:

[0038] First with 73~75wt% CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Particles, 5-6wt% α-Al 2 o 3 Micropowder, 3-4wt% calcium aluminate cement, 7-8wt% magnesium aluminum spinel fine powder and 8-9wt% platy corundum fine powder are raw materials, plus 0.1-0.2wt% polycarboxylate Salt water reducer, mix evenly; then add 5-6wt% water of the raw materials, stir evenly, shape, maintain for 2-3 days, demould, bake, and prepare CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Ladle lined with castables.

[0039] the CA 6 -MA-Cr 2 o 3 -Al 2 o 3 The preparation method of the granule is: the CA of 66~70wt% is mixed first 6 , 4-6wt% of chromium oxide, 10-16wt% of MA and 10-12wt% of alumina are mixed, and ball milled for 4-8 hours to obtain ball-milled powder; then add 6-10wt% of the ball-milled water to granulate, Prefabricated spheres with a partic...

Embodiment 2

[0042] a CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Castable for ladle lining and preparation method thereof. The preparation method described in this embodiment is:

[0043] First with 71~73wt% CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Particles, 5-7wt% α-Al 2 o 3 Micropowder, 3-5wt% calcium aluminate cement, 7-9wt% magnesium aluminum spinel fine powder and 8-10wt% platy corundum fine powder are raw materials, plus 0.1-0.2wt% polycarboxylate Salt water reducer, mix evenly; then add 5-6wt% water of the raw materials, stir evenly, shape, maintain for 2-3 days, demould, bake, and prepare CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Ladle lined with castables.

[0044] the CA 6 -MA-Cr 2 o 3 -Al 2 o 3 The preparation method of the granule is: the CA of 64.5~68wt% is mixed first 6, 4.5-6.5wt% of chromium oxide, 11-17wt% of MA and 11-12wt% of alumina are mixed, and ball milled for 4-8 hours to obtain ball milling powder; then add 6-10wt% of water of the ball milling powder, and granulate , to prepare pre...

Embodiment 3

[0047] a CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Castable for ladle lining and preparation method thereof. The preparation method described in this embodiment is:

[0048] First with 69~71wt% CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Particles, 6-7wt% α-Al 2 o 3 Micropowder, 4-5wt% calcium aluminate cement, 8-9wt% magnesium aluminum spinel fine powder and 9-10wt% platy corundum fine powder are raw materials, plus 0.1-0.2wt% polycarboxylate Salt water reducer, mix evenly; then add 5-6wt% water of the raw materials, stir evenly, shape, maintain for 2-3 days, demould, bake, and prepare CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Ladle lined with castables.

[0049] the CA 6 -MA-Cr 2 o 3 -Al 2 o 3 The preparation method of the granule is: first mix 63~66wt% CA 6 , 5-7wt% of chromium oxide, 12-18wt% of MA and 12-13wt% of alumina are mixed, and ball milled for 4-8 hours to obtain ball milling powder; then add 6-10wt% of water to the ball milling powder, and granulate, Prefabricated spheres with a par...

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Abstract

The invention relates to a CA6-MA-Cr2O3-Al2O3 ladle lining castable and a preparation method thereof. According to the technical scheme, 65-75wt% of CA6-MA-Cr2O3-Al2O3 particles, 5-8wt% of alpha-Al2O3micro powder, 3-6wt% of calcium aluminate cement, 7-10wt% of magnesium aluminate spinel fine powder and 8-12wt% of platy corundum fine powder are taken as raw materials, a polycarboxylate water reducing agent and water are added, and stirring, forming, demoulding and baking are carried out to prepare the CA6-MA-Cr2O3-Al2O3 ladle lining castable. The preparation method of the CA6-MA-Cr2O3-Al2O3 particles comprises the following steps of: mixing 60-70wt% of CA6, 4-8wt% of chromium oxide, 10-20wt% of MA and 10-15wt% of aluminum oxide, and ball milling, adding water, granulating, drying, calcining at 1650-1750 DEG C, crushing and screening to obtain the CA6-MA-Cr2O3-Al2O3 particles with three particle size levels respectively. The product prepared by the method has the advantages of high strength, low thermal conductivity, good thermal shock stability, excellent erosion resistance, energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of ladle lining castables. In particular a CA 6 -MA-Cr 2 o 3 -Al 2 o 3 Castable for ladle lining and preparation method thereof. Background technique [0002] With the increasing emphasis on environmental protection, high-temperature industries such as iron and steel metallurgy with high energy consumption are facing huge pressure on energy conservation and emission reduction. As one of the important containers in the metallurgical industry, the ladle plays the role of storing, transporting and processing molten steel, and at the same time performs the task of refining outside the furnace. Therefore, the ladle lining refractory material is facing multiple pressures: on the one hand, with the improvement of the life of the converter, the increase of the continuous casting ratio and the improvement of the refining technology outside the furnace, the ladle lining material is facing an increasingly harsh e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 李亚伟廖宁米顿·纳什桑绍柏
Owner WUHAN UNIV OF SCI & TECH
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