Chromium free refractory material for RH vacuum furnace lining

A technology of refractory materials and vacuum furnace, applied in the field of refractory materials, can solve the problems of slag resistance performance and service life that cannot be replaced, damage to the environment, and diffusion of harmful substances.

Inactive Publication Date: 2006-01-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is a carcinogen to the human body. It volatilizes during ultra-high temperature firing of refractory materials and high-temperature use under alkaline conditions. Waste refractory materials dissolve into groundwater during the process of stacking and landfilling. Waste refractory materials are discarded after separation of metamorphic layers during utilization. , crushing and dusting may cause the spread of such harmful substances and damage the environment
[0014] Some of

Method used

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  • Chromium free refractory material for RH vacuum furnace lining
  • Chromium free refractory material for RH vacuum furnace lining
  • Chromium free refractory material for RH vacuum furnace lining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] Examples are shown in Table 4.

[0045] Example

comparative example

1

2

3

4

5

6

1

2

Granularity:

≤0mm

Electrofusion

Magnesia

91%

Electrofusion

Magnesia

88%

Magnesium zirconium silicon

synthetic sand

96%

Magnesium zirconium silicon

synthetic sand

92.5%

Electrofusion

Magnesia

91%

Magnesium zirconium

synthetic sand

94%

Magnesium zirconium

synthetic sand

96%

Electrofusion

Magnesia

84.5%

Zircon

≤0.088mm

5％

8％

3％

4％

5％

15.5％

Zirconia

≤0.088mm

4％

4％

4％

4.5％

5％

1％

4％

sodium humate

(additional)

2％

2％

3％

2％

2％

2％...

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PUM

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Abstract

The chromium-free refractory material for RH vacuum furnace lining consists of one or several of magnetize, magnesia zirconia and magnesia zirconia silica 88-97 wt%, fine zirconia powder 1-6 wt%, fine zircon powder 0-9 wt%, and organic binding agent 1-3 wt%. It has the chemical composition of MgO 80-90 wt%, SiO2 1-4 wt%, and ZrO2 7-13 wt%. The organic binding agent is binding agent commonly for refractory material, such as sodium humate, calcium lignosulfonate, dextrin and Arabic gum. The MgO-SiO2-ZrO2 chromium-free refractory material has high slagging resistance and is significant for RH vacuum furnace to obtain long service life.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to refractory materials for furnace linings of RH vacuum smelting equipment. Background technique [0002] The refractory material used for the furnace lining of RH vacuum refining equipment needs to withstand the severe erosion of high-temperature molten steel, the melting erosion of slag and molten steel, and the intense thermal shock damage process of intermittent treatment of molten steel. The material is required to have excellent resistance to molten steel and slag. Erosion performance, good high temperature strength, and at the same time, the material is also required to have sufficient thermal shock stability. Magnesium-chromium products fired at ultra-high temperature, because of their excellent performance in all aspects mentioned above, have been selected as the most suitable lining refractories for RH vacuum smelting equipment in the past few decades, and are still RH...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/04C04B35/48C04B35/109C21B7/06
Inventor 陈荣荣牟济宁何平显甘菲芳
Owner BAOSHAN IRON & STEEL CO LTD
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