Splashing broken bits to protect furnace is one kind is used at lengthening converter of converter furnace life, protection the technique of fireproof material, especially the converter in process of steel of commonly used Yu Lian. Through using slag medium material is below the concussion of high-pressured gas splash arrives on furnace wall, form layer of a protection broken bits, be opposite in order to reduce melt molten steel and slag of fireproof material erode, prolong the service life of converter thereby.
One, the working principle that splashs broken bits to protect furnace 1. Of slag use: After steel-making ends, the slag of certain amount can remain inside furnace, these slag contain tall proportional ferric oxide (FeO) , magnesian (MgO) wait for composition. These composition have good liquidity below high temperature, can issue solidify in certain condition. 2. High-pressured gas pounds: Carry gas of inbreathe high pressure (like oxygen or nitrogen) , slag is churned and splash furnace wall and hearth, form an even broken bits layer to enclothe in fireproof material surface. This process is called " splash broken bits to protect furnace " .
3.The formation of broken bits layer and solidify: Slag will be fast below high temperature caky, form compact covering layer, this broken bits can cut off the direct contact of molten steel and slag to fireproof material, reduce what expect to firebrick or spray to erode.
2, splash broken bits to protect furnace the influence of fireproof to converter material
1.Reduce machinery to erode: In converter steelmaking process, of molten steel and slag churn the meeting is right fireproof material causes strong mechanical impact inside furnace. Protect furnace through splashing broken bits, broken bits layer can form resilient coating in fireproof material surface, reduce molten steel and slag to be mixed to the direct attrition of firebrick erode.
2.Reduce chemistry to erode: Fight frit caustic sex: The material such as the FeO in splashing broken bits to protect the covering layer that furnace forms to be able to reduce the molten steel below high temperature, broken bits effectively, CaO is eroded to the chemistry of fireproof material, wait for the fireproof stuff with simple material to magnesian carbon brick especially, the layer that splash broken bits can slow down speed of its frit caustic. Oxidation protection: The MgO content in broken bits layer is higher, can have certain protective effect to the carbon in fireproof material, reduce the carbolic oxidation prediction of a person's luck in a given year in fireproof material, prolong the service life of fireproof material thereby.
3.Prolong furnace life: Because splash broken bits to protect furnace to be able to reduce the machinery of fireproof material and chemical loss effectively, the furnace life of converter connects regular meeting to be lengthened significantly, because fireproof material is eroded,reduce those who bring about frequency of maintenance stopping furnace, improve manufacturing efficiency.
4.Raise fireproof material to use efficiency: Using the circumstance that splashs broken bits to protect furnace to fall, the fireproof material of converter wall falls to be able to corrode ceaselessly and be used up in the action of molten steel of long-term high temperature and slag. And protect furnace through splashing broken bits, of lining material use up rate is apparent drop, can reduce the use amount of fireproof material, reduce moving cost.
5.Improve slag performance: Splash broken bits to protect furnace to be able to raise the MgO content in slag, maintain the alkalinity of slag, conduce to form stabler broken bits photograph, raise integral slag to be opposite thereby the protective effect of fireproof material.
3, the craft that splashs broken bits to protect furnace optimizes the effect that splashs broken bits to protect furnace concerns with many elements: Slag composition controls: Through adjusting content of the MgO in slag, optimize slag composition, can improve the compact sex of the layer that splash broken bits and protective result. Aeriform inbreathe parameter: The parameter such as the inbreathe pressure of high-pressured gas, angle, time can affect the result that splash broken bits, blow reasonably splash an operation to be able to make slag is enclothed equably in furnace cliff face, form better covering layer. Broken bits measures control: Right amount remain broken bits is the main base that splashs broken bits to protect furnace, too little broken bits quantity cannot form effective covering layer, too much broken bits quantity can increase cost and craft difficulty.
Summary splashs broken bits to protect furnace is converter of a kind of effective protection the fireproof material, technology that prolongs furnace life, can reduce molten steel and slag to be eroded to the machinery of lining and chemistry, reduce fireproof material use up, improve manufacturing efficiency. In contemporary steelmaking process, splash broken bits to protect heat technique to had made the crucial step that prolongs converter life.
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