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High-calcium low-iron magnesian dry method ramming mass and its production method

A technology of iron-magnesium and ramming material, which is applied in the field of refractory materials, can solve the problems of aggravated corrosion of furnace bottom materials and unsuitability to changes in steelmaking raw materials, and achieve lower sintering temperature, high resistance to slag erosion, and prevention of large cracks Effect

Inactive Publication Date: 2005-08-17
海城华宇耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the Si content in molten iron is higher than that in scrap steel, Si turns into SiO under electric furnace oxidation conditions. 2 , the erosion of the furnace bottom material is aggravated, so the dry ramming material with low calcium and high iron and magnesium is not suitable for the change of steelmaking raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Lightly burned magnesium powder (ignition loss ≤ 3%, MgO ≥ 94%, SiO 2 ≤0.8%) 600Kg, lightly burned dolomite powder (ignition loss ≤15%, MgO 35-40%, CaO 40-48%, SiO 2 ≤0.6%) 350Kg, iron oxide powder (Fe 2 o 3 ≥80%, SiO 2 ≤1.5%) 50Kg, prepared according to steps 1-5 of the above-mentioned preparation method, wherein 40Kg of water is added in the second step, the diameter of the ball in the third step is 30mm, and the calcination temperature in the fourth step is 1650°C-1680°C, heat preservation 8 hours; then take 240Kg of 6-3mm particle size powder, 184Kg of 3-1mm particle size powder, 173Kg of 1-0mm particle size powder, 185Kg of fine powder ≤ 0.088mm, and the fused magnesia (MgO≥ 97%, SiO 2 ≤1.5%, particle bulk density ≥3.45g / cm 3)84Kg, 89Kg of fused magnesia with a particle size of 1-0mm, 20 # Diesel oil 3Kg, fused magnesia superfine powder (MgO≥97%, SiO 2 ≤1.5%, particle size≤10 μm, average particle size≤1.53 μm) 42Kg, prepared according to step 6.

Embodiment 2

[0034] Lightly burned magnesium powder (ignition loss ≤ 12%, MgO ≥ 78%, SiO 2 ≤0.6%, CaO6-9%) 720Kg, lightly burned dolomite powder (ignition reduction ≤15%, MgO 35-40%, CaO 40-48%, SiO 2 ≤0.6%) 240Kg, iron oxide powder (Fe 2 o 3 ≥80%, SiO 2 ≤1.5%) 40Kg, prepared according to steps 1-5 of the above-mentioned preparation method, wherein 30Kg of water is added in the second step, the diameter of the ball in the third step is 60mm, and the calcination temperature in the fourth step is 1700°C-1750°C, heat preservation 10 hours; Then get 6-3mm powder 240Kg, 3-1mm powder 206Kg, 1-0mm powder 196Kg, fine powder 185Kg≤0.088mm, particle size is the fused magnesia of 3-1mm (MgO≥97%, SiO 2 ≤1.5%, particle bulk density ≥3.45g / cm 3 )63Kg, 50Kg of fused magnesia with particle size of 1-0mm, 20 # Diesel oil 3Kg, fused magnesia superfine powder (MgO≥97%, SiO 2 ≤1.5%, particle size≤10 μm, average particle size≤1.53 μm) 57Kg, prepared according to step 6.

Embodiment 3

[0036] Lightly burned magnesium powder (ignition loss ≤ 12%, MgO ≥ 78%, SiO 2 ≤0.6%, CaO6-9%) 470Kg, lightly burned dolomite powder (ignition reduction ≤15%, MgO 35-40%, CaO 40-48%, SiO 2 ≤0.6%) 500Kg, iron oxide scale powder (Fe 2 o 3 ≥80%, SiO 2 ≤1.5%) 30Kg, prepared according to steps 1-5 of the above-mentioned preparation method, wherein 50Kg of water is added in the second step, the diameter of the ball in the third step is 40mm, and the calcination temperature in the fourth step is 1680°C-1720°C, heat preservation 9 hours; Then get 6-3mm powder 240Kg, 3-1mm powder 221Kg, 1-0mm powder 196Kg, fine powder 185Kg of ≤0.088mm, particle size is the fused magnesia of 3-1mm (MgO≥97%, SiO 2 ≤1.5%, particle bulk density ≥3.45g / cm 3 )48Kg, 30Kg of fused magnesia with a particle size of 1-0mm, 20 # Diesel oil 3.0Kg, fused magnesia superfine powder (MgO≥97%, SiO 2 ≤1.5%, particle size≤10 μm) 77Kg, prepared according to step 6.

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Abstract

The present invention provides one kind of high calcium low iron magnesia material as refractory ramming material and its preparation process. The present invention has materials including light burnt magnesia powder, light burnt dolomite powder, fused magnesia, superfine fused magnesia powder, iron oxide scale as rolling waste, iron oxide powder as steel making side product, and diesel oil. The present invention has high heat resistance, high load softening performance, high breaking strength, high heat shock performance, high slag corrosion resistance and thin furnace bottom sintered layer. It is especially new steel making process, and can maintain excellent performance at high temperature.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to unshaped refractory materials, in particular to unshaped refractory materials for lining high-temperature smelting vessels. Background technique [0002] Bottoms of steelmaking electric furnaces, ferroalloy smelting electric furnaces and thermal refining devices are very important parts of smelting equipment. The quality of refractory materials used here is directly related to the implementation of new technologies of fast and efficient steelmaking, high quality and low consumption. It is also related to the safe production of avoiding furnace leakage accidents. [0003] In the prior art, there are two main types of working linings used in the furnace bottoms of steelmaking electric furnaces, ferroalloy smelting electric furnaces and refining ladle furnace bottoms: one is to build furnace bottoms with bricks, mainly magnesia carbon bricks and burnt magnesia brick. Magnesia-c...

Claims

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Application Information

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IPC IPC(8): C04B35/04C04B35/66
Inventor 李广达张永禄王艳玲金元刚
Owner 海城华宇耐火材料有限公司
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