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Electric furnace bottom dry ramming mass and its making method

A dry ramming material and furnace bottom technology, which can be used in furnaces, furnace components, lighting and heating equipment, etc. Effect

Inactive Publication Date: 2007-02-14
上海彭浦特种耐火材料厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, it is generally used at home and abroad that is rich in 2CaO·Fe 2 o 3 Magnesium and rich in 3CaO·Fe 2 o 3 Magnesia-dolomite-based mixture; however, there are generally disadvantages that the sintered layer is too thick, resulting in cracking and turning over and poor resistance to melting loss

Method used

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  • Electric furnace bottom dry ramming mass and its making method
  • Electric furnace bottom dry ramming mass and its making method
  • Electric furnace bottom dry ramming mass and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The electric furnace bottom dry ramming material of the present invention contains magnesia-calcium-iron sand and high-purity fused magnesia; wherein: magnesia-calcium-iron sand includes MgO30%, CaO55%, Fe 2 o 3 8%, Al 2 o 3 1.3%, SiO 2 1.5%, burning loss 1.0%, impurity 3.2%, bulk density ≥ 2.5g / cm 3 ; The critical particle size of high-purity fused magnesia is 10mm, and the amount of particle introduction is 0%;

[0014] Preparation method of the present invention is realized through the following steps:

[0015] The preparation of magnesia calcium iron sand includes: raw material selection and rotary kiln reburning; among them, the raw material selection includes MgO30%, CaO55%, Fe 2 o 3 8%, Al 2 o 3 1.3%, SiO 2 1.5%, burning loss 1.0%, impurity 3.2%, bulk density ≥ 2.5g / cm 3 ; The reburning temperature of the rotary kiln is 1700°C;

[0016] The dry ramming material at the bottom of the electric furnace uses the Andreassen formula y=100(d / D) q Particle gra...

Embodiment 2

[0018] The electric furnace bottom dry ramming material of the present invention contains magnesia-calcium-iron sand and high-purity fused magnesia; wherein: magnesia-calcium-iron sand includes MgO83%, CaO8.5%, Fe 2 o 3 4.1%, Al 2 o 3 0.45, SiO 2 0.78, ignition loss 0.11, impurity 3.06, bulk density ≥ 2.5g / cm 3 ; The critical particle size of high-purity fused magnesia is 10mm, and the amount of particles introduced is 75%;

[0019] Preparation method of the present invention is realized through the following steps:

[0020] The preparation of magnesia-calcium iron sand includes: raw material selection and reburning of rotary kiln; among them, raw material selection includes MgO83%, CaO8.5%, Fe 2 o 3 4.1%, Al 2 o 3 0.45, SiO 2 0.78, ignition loss 0.11, impurity 3.06, bulk density ≥ 2.5g / cm 3 ; The reburning temperature of the rotary kiln is 1750°C;

[0021] The dry ramming material at the bottom of the electric furnace uses the Andreassen formula y=100(d / D) q Parti...

Embodiment 3

[0023] The electric furnace bottom dry ramming material of the present invention contains magnesia-calcium-iron sand and high-purity fused magnesia; wherein: magnesia-calcium-iron sand includes MgO63%, CaO27.6%, Fe 2 o 3 5%, Al 2 o 3 0.9%, SiO 2 0.8%, ignition loss 0.5%, impurity 2.2%, bulk density ≥ 2.5g / cm 3 ; The critical particle size of high-purity fused magnesia is 10mm, and the amount of particles introduced is 45%;

[0024] Preparation method of the present invention is realized through the following steps:

[0025] The preparation of magnesia calcium iron sand includes: raw material selection and rotary kiln reburning; among them, raw material selection includes MgO63%, CaO27.6%, Fe 2 o 3 5%, Al 2 o 3 0.9%, SiO 2 0.8%, ignition loss 0.5%, impurity 2.2%, bulk density ≥ 2.5g / cm 3 ; The reburning temperature of the rotary kiln is 1730°C;

[0026] The dry ramming material at the bottom of the electric furnace uses the Andreassen formula y=100(d / D) q Particle g...

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Abstract

The present invention is dry refractory ramming material for bottom of electric furnace and its preparation process. The dry refractory ramming material consists of magnesia-calcium oxide- ferric oxide sand and high purity fused magnesia. The magnesia-calcium oxide- ferric oxide sand is prepared with the materials including MgO, CaO, Fe2O3, Al2O3, SiO2, burnt IL and other material in certain proportion and through sintering in rotary kiln at 1700-1750 deg.c, and has density not lower than 2.5 g / cu cm. The high purity fused magnesia has critical granularity of 10 mm and accounts for 0-75 wt%. The preparation process of the dry refractory ramming material includes preparation of magnesia-calcium oxide- ferric oxide sand and grading based on Andrassen formula. The dry refractory ramming material has no cracking and high corrosion resistance and can meet the requirement of use in steel making electric furnace.

Description

technical field [0001] The invention relates to the field of electric furnace steelmaking, in particular to an electric furnace bottom dry ramming material (trade name: PN-new type electric furnace bottom dry ramming material) and a preparation method thereof. Background technique [0002] Electric furnace steelmaking is a short-process steelmaking method that recycles scrap steel, is environmentally friendly and energy-saving, and is fast and efficient. Its rapid development has driven the development of MgO-CaO-Fe 2 o 3 It is the rapid research and development and comprehensive popularization of electric furnace bottom ramming material. For example, Baosteel’s 150-ton ultra-high-power DC electric arc furnace was imported from France’s Clecim Company, with a capacity of 190 tons and 40 tons of steel left for operation. Scrap steel is mixed with molten iron. The double-furnace seat alternate smelting method is adopted, and the tapping temperature is 1600-1650 °C. The avera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/03C04B35/66F27B3/14F27D1/00
Inventor 蓝振华
Owner 上海彭浦特种耐火材料厂有限公司
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