Magnesium calcium RH varnished tube hot spray repair material for smelting silicon steel and formulating method thereof
A gunning material, magnesia-calcium technology, applied in the field of refractory materials, can solve the problems of affecting the resistance to molten steel circulation erosion, affecting the normal operation of the RH furnace, and threatening the life of magnesia-chrome bricks, so as to improve the corrosion resistance and molten steel erosion resistance , excellent erosion, the effect of reducing the amount of liquid phase
Active Publication Date: 2009-02-18
上海彭浦特种耐火材料厂有限公司
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Problems solved by technology
However, with the increase of high-grade special steel varieties, especially the sharp increase in the demand for special silicon steel, harsh operating conditions such as high-alkaline slag lead to the loss of general magnesium gunning material when it is used for less than one furnace after gunning. No damage, which seriously threatens the life of magnesia-chrome bricks and affects the normal operation of the RH furnace
The reason for the analysis is that special silicon steel needs to add a large amount of CaF during refining due to its ultra-low sulfur requi
Method used
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[0033] 1. The purity of selected main raw materials is as follows: (mass percentage content)
[0034]
[0035] 2, the composition of embodiment and comparative example and each performance index thereof.
[0036]
[0037] It can be concluded from the above examples that the magnesium-calcium material of the present invention is better than the existing RH dip tube thermal gunning material in terms of corrosion resistance to high alkali slag, thermal strength and service life.
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Abstract
The invention relates to a calcium magnesium RH dip pipe hot spray repair material used for high-performance smelting silicon steel and a preparation method, and is characterized in that the invention adopts high-purity magnesium gravel and synthesis magnesium calcium as main components; more than one of organic addition agents of woodiness calcium sulphonate, modified starch ether, and the like are used in composite mode to substitute low-melting harmful plasticizers of soft clay, water glass, and the like used by conventional spray repair material to realize good spray repair adhesiveness and good high-temperature performance of the spray repair material. The invention uses two ultra fine powder of ultra fine MgO micro powder, SiO2 micro powder and calcium hydroxide micro powder in composite mode to act slushing enhancement effect, further improves adhesiveness and agglutinating property of the material, and enhances high temperature strength of the material. Provided spray repair material has high hot strength, good high-residue erosion resistance performance and good molten steel erosion resistance performance; spraying and repairing a dip pipe can make the service life be more than one furnace when a RH device smelts low sulphur special silicon steel, thus satisfying the requirements of the smelting of the special silicon steel.
Description
technical field [0001] The invention relates to a high-performance magnesia-calcium RH impregnated pipe thermal spraying material for smelting silicon steel and its preparation method. Specifically, the invention provides a magnesia-calcium impregnated pipe life-span for improving the life of the RH impregnated pipe in the silicon steel smelting and refining system. Hot gunning material. It belongs to the field of refractory materials. Background technique [0002] With the emergence of new smelting technologies, the production of pure steel has developed rapidly. The RH cycle degassing method is a kind of refining method outside the furnace. Its main principle is: insert the ascending pipe and descending pipe of the vacuum degassing cylinder into the molten steel of the ladle at the same time, and blow argon gas into the lower end of the ascending pipe, so that the ascending pipe and the descending pipe will generate a pressure drop between them, and the molten steel can ...
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IPC IPC(8): C04B35/66
Inventor 李华坚
Owner 上海彭浦特种耐火材料厂有限公司
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