Compound and fireproof material regards the important material that uses in steely smelt process as qualitative crucial perhaps part and be used extensively, but because they are in slaggy local frit damage often produces when one metal interface is used and control its service life.
For example, contemporary steel bag uses magnesian carbon brick normally the plan that with strengthening position of broken bits line general wall adopts oxide to fasten fireproof material partition to build line, but the problem that often pledges local frit damage can produce however on border in two kinds of material, the result brings about life to reduce and discard as useless. Caustic of this kind of local frit happens on the border of different and phyletic fireproof material, and remarkable frit caustic basically happens in slaggy on one metal interface.
Be like again, the local frit caustic of chamfer of blast furnace taphole, be in not only slaggy surface, and in slaggy 2 generation also produce significantly on interface of one molten iron because be in,local frit caustic is of position of local frit cutting taphole chamfer material - the metal asks to often exist the broken bits film of poor liquid condition, next direction on composition of broken bits film produce change, existing interfacial tension gradient. Because gradient of tension of this kind of interface causes campaign of broken bits film, the substance that promoted patulous layer effectively as a result is migratory, and also caused fireproof material wear away increase.
Be like again, xiang Jingnan grand wait for a person to use CaO-Al2O3-SiO2 slaggy reach CaO-Al2O3-CaF2 slaggy research crosses Al2O3-C to pledge Lian Zhu uses data of immersion water mouth (pulverous - metal) the interface is local frit caustic. Their research is to use device of X ray transmission, the water mouth material in observing local frit caustic undertakes directly (crucible) - slaggy - the circumstance near metallic three-phase border. The result is found out, of position of local frit cutting slaggy - metallic interface, the fluctuation that undertakes is like graph 5—20 place showing repeatedly on one hand moves, produced local frit damage on the other hand. Those who resemble graph 5—20 kind is slaggy - metallic interface is in drop period when, water mouth material and metal ask immerge slaggy and formed broken bits film, produce oxide fuse by water mouth material in broken bits film. If surface of water mouth material became rich graphitization, can be broadened with the broken bits film with black lead bad adhere so and back down, make by the metal with good adhere then surface of water mouth material by stick together, bring about slaggy one metal interface rises (graph 5—20) . In this slaggy during the rise of one metal interface, the black lead that contacts directly with the metal quickly fuse in the metal. Contrary, if surface of water mouth material became oxide rich turn an area, so with oxide adhere good slaggy meeting forms broken bits film from immerge of photograph of upside broken bits again. Because this one process occurs repeatedly,make local frit caustic undertakes ceaselessly. Apparent. Slaggy - metallic interface moves up and down a periodic time is shorter, rate of local frit caustic is older.
In the practical technology that connect casting, because the carbolic concentration in the metal is low, so black lead the fusible rate to the middle of the metal is rapid. Slaggy - the rise of metallic interface period with drop period photograph is compared, it is very short, consequently this rises period basically advance what make local frit decrease period. We are in this one eventuate when material is designed character to how controlling Lian Zhu water mouth is in slaggy the local frit caustic of one metal interface, increase water opening service life provided important basis.
Visible, explain mechanism of local frit caustic can prevent local frit caustic to offer for establish send goodly.
Additional, will look from broad sense. Expand, the countermeasure that deepens the local frit damage that controls fireproof material to establish about the research of phenomenon of high temperature interface also is serious content.
Look now, can close according to different use field, use different the way to deal with a situation to check fireproof data respectively the speed of local frit caustic.
1 improved ability is qualitative
In actual Lian Zhu, but in the local frit caustic according to mouth of Al2O3-C immersion water slaggy the rise of one metal interface period than dropping period remarkable short this one feature, thinking to control local frit damage is to make very slaggy - the rise of metallic interface period disappear, drop period long point of view undertakes water material reforms character. The case with this convincing respect is Xiang Jingnan grand the BN with wait for a person to will compare black lead with slaggy adhere sex better adds Al2O3-C immersion water mouth material is qualitative in, the result came true to rise period disappear basically, the qualitative surface of water mouth material of position of local frit cutting often by slaggy enclothe, cut off water mouth material to pledge medium black lead is the same as direct contact of the metal thereby, controlled the local frit damage of mouth of Al2O3-C immersion water.
The 2 scale of small fusible part in improving fireproof data
Understand already, magnesian chromic brick is had to low alkalinity broken bits fight aggressivity goodly, in be being used extensively at the molten steel finery such as VOD, RH consequently and the important and backup material of the fireproof material that regards melt as reductive furnace application. In these circumstances, the fact that as the addition of content of the Cr2O3 in magnesian chromic brick deepness of local frit caustic reduces, through raising the Cr2O3 in burden content can reduce amount of local frit caustic, improve service life.
3 development new material is qualitative
Still be in order to connect casting with immersion water mouth exemple, the fusible rate in considering broken bits of ZrO2 Xiang Rong is low, and ZrO2 still can become atomic in suspension in broken bits film, can raise viscosity of apparent of broken bits film, control movement of broken bits film, the result makes drop period the speed of fuse of oxide of generation of water mouth material is reduced and make local frit caustic of whole is restrained by effective ground, develop ZrO2-C immersion thereby water mouth replaces Al2O3-C immersion water mouth, and make local frit caustic got be controllinged effectively.
4 have slaggy control
The person such as discipline of Ji Fu a unit of length thinks, slaggy to resembling liner of chamfer of blast furnace taphole be in the damage of remarkable and local frit that interface of one molten iron produces, can from restrain campaign of broken bits film to set out, use following measure to control:
Make in campaign of broken bits film carbolic in suspension: When the metal medium carbolic concentration is close to chroma of saturated area spoon when, rise as carbolic pH indicator, local frit damage decreases significantly, think shaddock blood crosses carburet operation to control local frit damage consequently solubility is joined in 2 Xiang Rong broken bits low and the oxide that has high melting point or generation resemble, the substance appearance with the sort of low solubility (for example ZrO2) . That is to say, through be opposite slaggy the local frit damage that has controlling can inhibition fireproof data effectively.
5 changes liner is designed
The remarkable frit caustic on border of fireproof to happening in different sort material basically is to establish segregation to take. For example, local frit damage does not produce when magnesium of steel bag liner uses magnesian carbon brick between carbolic brick and tall aluminous brick; Also can pass the position that changes juncture of heterogeneous and fireproof material to control the problem that damage of remarkable and local frit produces on border of different and phyletic fireproof material.
Annals of fireproof data limited company is in furnace of kiln of Zhengzhou Rong Cheng industrial dedicate oneself to the service of one's motherland, industry of service high temperature is oneself, we bear tens of year the technology is accumulated, active and before look up ground is high temperature industry will make tomorrow make brand-newly, become hard " boiler and expert of liner of furnace of hot project kiln " .
Get Price
WhatsApp