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Magnesite-dolomite ramming refractory taking castor oil as binding agent

A technology of castor oil and binder, which is applied in the field of magnesia dolomite refractory ramming materials, can solve the problems of narrow gaps, inability to use refractory bricks, complex structure, etc., and achieve easy use, high strength, and good thermal shock resistance Effect

Active Publication Date: 2014-12-03
海城市金福锋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during use, due to the complex structure and narrow gaps in some special areas when laying refractory bricks for stainless steel refining equipment, refractory bricks cannot be used, and workers must manually fill them with unshaped refractory materials.

Method used

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  • Magnesite-dolomite ramming refractory taking castor oil as binding agent

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The components of each raw material are composed as follows by weight percentage: magnesia-calcium sand is made into three particle sizes of A, B, and C respectively, among which: 8≥A>3mm13%; 3≥B>1mm35%; 1≥C>0mm22%; industrial use Castor oil 7%; 98 fused magnesium 240 mesh: 25.5%; chrome green: 1%; 92 silica fume: 0.5%; fluorite powder 325 mesh: 2%; resin powder 4012 (thermosetting): 1%; Schedule 1.

[0046] This refractory ramming material is used in the stainless steel AOD furnace, at the edge of the spherical furnace bottom. Due to the erosion of refractory bricks at this position, the refractory ramming material will be exposed to the severe erosion of molten steel after several furnaces of smelting. This invention has high corrosion resistance and thermal shock resistance, and is easy to sinter to generate strength and can Effectively prevent molten steel from leaking.

Embodiment 2

[0048] The raw material components are composed as follows according to the weight ratio: magnesia-calcium sand is made into three particle sizes of A, B and C respectively, among which: 8≥A>3mm12%; 3≥B>1mm37%; 1≥C>0mm20%; Industrial castor oil 6%; 98 fused magnesium 240 mesh: 25.5%; chrome green: 2%; 92 silica fume: 0.5%; fluorite powder 325 mesh: 2%; resin powder 4012 (thermosetting): 1%; detection performance See attached table 1 for indicators.

[0049] This refractory ramming material is used in the stainless steel AOD furnace, at the bottom edge of the open hearth furnace. The depth of the bottom edge of the open hearth furnace is relatively large and the gap is small, and the construction conditions are relatively harsh. The invention has good construction performance and ensures construction quality. The smelting at this position will contact molten steel, and the present invention has easier sinterability in the baking stage before receiving molten steel, which can ...

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Abstract

The invention discloses magnesite-dolomite ramming refractory taking industrial castor oil as a binding agent. The magnesite-dolomite ramming refractory is characterized by comprising the following raw constituents in weight percentage: 65 percent of dead burned high-calcium magnesite MgO, 29 percent of CaO, smaller than or equal to 3 percent of Al2O, Fe2O3 and SiO2, 6 to 7 percent of castor oil, 25.5 percent of 98 fused magnesite with 240 meshes, 1 to 2 percent of chrome green, 0.5 percent of 92 silica fume, 2 percent of fluorite powder with 325 meshes, and 1 percent of resin powder 4012 (thermoset). Before being mixed, dead burned high-calcium magnesite particles are preheated, the temperature is 100 to 110 DEG C, and the time is 10 to 12 hours; then the rest of raw fine powder is preheated, and the fine powder is uniformly mixed to be reserved, so that the fine powder is more perfectly combined with the particles. Compared with the prior art, the magnesite-dolomite ramming refractory has the benefits that firstly, magnesium calcium refractory can be effectively prevented from being hydrated; secondly, the magnesite-dolomite ramming refractory is convenient to use and innocuous; thirdly, the magnesite-dolomite ramming refractory does not contain impurities capable of polluting molten steel; fourthly, the magnesite-dolomite ramming refractory is easy to sinter, has good thermal shock resistance, and can have high strength at the baking stage of stainless steel refining equipment.

Description

technical field [0001] The invention relates to a ramming material for a stainless steel AOD refining furnace, in particular to a magnesium dolomite refractory ramming material with castor oil as a binder. Background technique [0002] In my country, the stainless steel refining equipment is mainly AOD furnace, GOR furnace and VOD ladle. In the selection of refractory materials for stainless steel refining, due to the wide distribution of raw materials, low cost, good high temperature stability, and no pollution to the environment and molten steel during production and use, magnesium-calcium refractory materials can reduce molten steel to a certain extent. Due to the advantages of S, P and other impurities, it is used as working lining brick by most of the AOD furnaces, GOR furnaces and VOD ladles in my country. [0003] However, the disadvantages of magnesia-calcium refractories are also obvious. Due to the free calcium oxide, hydration reactions are prone to occur, which a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 裘伟石忠大江茂龙
Owner 海城市金福锋科技有限公司
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