Reduce steel to include fireproof bill of material bad news is resource of managing to steely enterprise fireproof material, energy-saving a when decrease a platoon main effect, to achieve this one goal, some steelworks uses new design on 60tLF steel bag and the condition is operated on the lid, got remarkable result.
1, the operation requirement that includes according to steel designs magnesian carbon brick
The alkalinity that this steel bag erodes the main reason with rapid rate is broken bits is inferior. Steel wraps early days broken bits to have higher FeO content, make the carbon in magnesian carbon brick is oxidized easily. Adopt what measure raises brick of magnesian carbon of broken bits line to fight oxidisability, brick of magnesian carbon of line of the broken bits after improving is after 3h of 1000 ℃ oxidation, oxidation decarburized layer has 1mm only, and ply of decarburized layer of carbolic brick oxidation achieved the magnesium of line of MT-14A broken bits before improving 5 ～ 7mm.
In the steel-making craft of steelworks, every furnace adds fluorite 50 ～ 60kg, this makes broken bits viscosity inferior. Because this chose to be able to raise the additive that contains viscosity of fluorite broken bits, in order to improve the service life of magnesian carbon brick. Sheet improves performance for, should use big crystallization high pure the natural black lead of electric frit magnesia, tall purity and appropriate antioxidant and intensifier. But, for economic benefits, also want to pay close attention to sexual price to compare particularly, below the circumstance that asks basically in contented service life, the reworked material of brick of carbon of the magnesium after using that can choose certain amount, use the colophony bond of the bitumen modified with partial low price.
According to afore-mentioned analysises, integrated consideration uses requirement and sexual price to compare, use quality mark to be 66% ～ the material of magnesian carbon of high quality second birth of 88% is main raw material, cooperate MgO content appropriately (W) is the electric frit magnesia of 97% , a few - the black lead of 195 brands, compound additive and modified resin bond classics burden, after mixing refine, shape on 630t attrition compressor, again solidify is made second birth is magnesian carbolic brick. Its manage changes sexual visibility to express 1. By the watch 1 knowable, the manage of brick of second birth magnesian carbon changes function to reach the level of high quality product of MT-12A of brick of carbon of the magnesium in national level and MT-14A completely.
The reason that expresses brick of magnesian carbon of 1 second birth turns performance
The manage of brick of second birth magnesian carbon turns performance
The magnesian carbon brick after improving applies at 60tLF steel bag, show fight admirably erode, fight oxidation and heatproof shake sex. Life of broken bits line raises 24 ～ 19 times 28 times by the 15 ～ that brick of MT-14A magnesian carbon uses before improving, erode speed by · of 7 ～ 10mm second - 1 reduce · of 4.5 ～ 6.8mm second - 1. Bag nogging service life raises 45 ～ 50 times 55 times by 40 ～ , erode speed by · of 2.5 ～ 3.5mm second - 1 reduce · of 1.2 ～ 2.4mm second - 1.
2, improvement operates a condition
1) adds steel bag to change qualitative agent this steelworks used SiC deoxidizer, play the increase of content of the FeO in broken bits quantity and broken bits as electric stove, react according to deoxidization (SiC+4FeO=4Fe+SiO2+CO2) uses more SiC deoxidizer with respect to need, not only bring about steel-making cost to increase, and the M(CaO)/m(SiO2) in bringing about steel to wrap broken bits is reduced. Be opposite to reduce steel to wrap broken bits of lining erode, deoxidizer need not SiC is qualitative, and the content that use carbon (W) is the magnesian calcic carbon of 15% to pledge steel bag changes qualitative agent, its join quantity and carborundum deoxidizer basic and identical, 1kg is joined in every tons of steel namely. The CaO in changing qualitative agent raised steel to wrap the alkalinity of broken bits, the made frit corrode to the MgO in magnesian carbon brick reduces; to change the chroma of the MgO in pledging the MgO in the agent can raise broken bits, lower the deliquescent rate of the MgO in magnesian carbon brick consequently. Change the try out of qualitative agent character through magnesian calcic carbon, the one-time service life of brick of magnesian carbon of broken bits line rises by 26, rose 15% .
2) tapping leaves broken bits to because content of FeO of broken bits of electric stove evening is high,be operated, not only affected raw material close so that lead, raised steel-making cost, also brought about fine steel to include line at the same time of service life reduce. Through adjusting oxygen the angle of gun and carbolic gun is mixed carbon of gush of later period of electric stove of deepness, aggrandizement, improvement the method such as bubble broken bits, reduce content of the FeO inside electric stove broken bits, reduce the oxygen activity in broken bits, make broken bits steel detached (measure) in order to reduce next broken bits. Carry out a proof, the FeO content in leaving broken bits quantity and residue through control, the service life that fine steel surrounds rises by 50, rose 20% .
3) improvement maintains a system
To improve the service life of bath, with 2 class tall aluminous brick undertook subsidizing to bath, the brick of 2 class tall aluminium that is 40mm with ply namely subsidizes bath, subsidize use between brick and former lining but model bond ram and felt. After subsidizing, the service life of bath rises by 60, raised 45% above.
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