The fights aggressivity to basically pledge with material raw material of firebrick is concerned, according to material qualitative different cent is acidity firebrick, neuter firebrick and alkalescent firebrick, be opposite respectively soda acid is acidity and slaggy, slaggy with alkalescent and slaggy resistance strong. So of firebrick fight aggressivity and what element is concerned?
Want to understand what is to fight aggressivity above all. Fighting aggressivity is to point to all sorts of eroding to firebrick leaves resistance in high temperature medium erodes the ability with erosive effect. These erode medium to include all sorts of slag (furnace of to calcine of blast furnace, electric stove, converter, finery, nonferrous metal smelting furnace, reaction furnace) fluid of frit of metal of melt of liquid state of grog of grog of scrap of fuel, ash content, fly ash, lime, cement, alumina, rubbish, glass, soda acid, electrolyte all sorts of fluid, gaseous state.
Fight the importance of aggressivity next. Fighting aggressivity is to measure firebrick to fight chemistry to erode a with mechanical wear very main index, right to making production technology, reasonable the port with choose fireproof material to have principal.
The influence fights the element of aggressivity what to have: The factor that affects firebrick to fight aggressivity has mix immanently explicit. Does underlying factor basically include: ? Dash forward D of umbrella of mallet of an ancient unit of weight of Da of ⒖ of А of of act of department of herd of a legendary bird with poisonous feathers dash forward does Hu ┑ mire A Chinese-style unlined garment of scull Mao sinceres Lu reads Nai? to have: explicitly?
(The chemistry of 1) firebrick, mineral composition. Its fight the material that does not constitute with chemistry aggressivity is different, acidity firebrick erodes medium to have to acidity better fight aggressivity, and the ability that alkalescent firebrick resists acidity erodes medium is very weak. Firebrick is polyphase aggregation, by advocate brilliant photograph and matrix composition. Advocate of brilliant photograph fireproof degree of tall, grain big, crystal boundary is little, the matter content in fighting aggressivity to be like matrix relative to better; is high, form fluid photograph easily, be like formation fluid photograph viscosity low, to material fight aggressivity adverse.
(The constituent structure of 2) firebrick. In basically pointing to firebrick of each substance appearance distributing to reach distributinging state with combinative state of affairs and stomatic amount, size, appearance.
(The other property of 3) firebrick. Sex of the bulk density of firebrick, apparent pore rate, heatproof shake, fight oxidisability, high temperature to accumulate stability to wait to fight aggressivity to its the impact is very big. The material with the compact relatively loose stuff with tall, low porosity has bulk density better fight aggressivity; The material with heatproof shake poor sex gets thermal shock (when rotating, meeting occurrence crackle or craze flake, make erode medium to enter bricky system interior thereby, bring about its to fight aggressivity to reduce; Fight what oxidisability differs to contain carbon fireproof material, decarburized layer is formed after the surface oxidizes, the structure is loose easy fall off, make fight aggressivity to reduce volume of; high temperature firm be: ? ? of Mou Mu of ㄐ round Wan also can make its fight aggressivity to become poor commonly.
(4) erodes the influence of medium. Rate of the temperature of sex of the chemical composition that basically points to those who erode medium to decide, soda acid, viscosity, medium, flow (static state or dynamic) , pressure and atmosphere (erode property of interpose broken bits to gaseous state, oxidisability reproducibility) wait.
(5) firebrick and the interaction that erode medium. Firebrick and erode medium happening reaction to form high melting point or appearance of tall viscosity substance, be helpful for those who reduce pair of material eroding.
(6) the influence of use condition. Basically include time of temperature discretion and fluctuant circumstance pressure, atmosphere, contact and area to wait. Temperature is high, wave motion is big, press muscularity or vacuum, atmosphere aggressivity is strong, broken bits engages time long, area is large, to material erode more serious.
Raise firebrick to fight aggressivity to be able to take following step:
(1) raises the purity of raw material, improve the chemical and mineral composition of goods, reduce the content; of low frit content and impurity as far as possible
(2) notices the select material of fireproof material, the fireproof material; that chooses close of as chemical as what erode corrode medium composition as far as possible is additional, fireproof material in use, still should notice place is used law character is changed to answer between material close, prevent or reduce with material in the place below high temperature condition the interface between mars reaction.
(3) chooses appropriate production methods, acquire the product that has compact and even organization structure.
Lose by force according to the wearability of of all kinds and fireproof material, substantially can divide it is 3 kinds: Carborundum is qualitative the wearability of fireproof material is the strongest, expensive aluminous simple fireproof stuff and corundum are qualitative the wearability be placed in the middle of fireproof material, alkalescent and fireproof material, silicon the qualitative, wearability that sticks earthy and fireproof material is the poorest.
Expensive aluminous simple fireproof stuff because alumina content difference is bigger, distributinging range of its wear extent is wider.
Mineral hardness is taller, its wearability is stronger, such OK also saying, carborundum is qualitative fireproof material wear extent is the smallest. Accordingly, the place that a few keys erode, choose wear-resisting fireproof material.
And the combines photograph nitrogen to change silicon hardness that nitrogen changes silicon to combine carborundum material tall, strength is great, be able to bear or endure the hardness of the combinative appearance Mo Laishi of material of argillaceous union carborundum and vitreous photograph is lesser, accordingly, nitrogen changes silicon to combine carborundum material to combine carborundum material to have better wearability than clay.
The tall aluminium that uses preparation of makings of what of identical tall aluminous alumina is pouring the brick of wearability excel tall aluminium of makings, both wear extent differs make an appointment with 60%-90% , same, clay is pouring the wearability of makings is met of excel clay brick.
Pouring makings use small powder technique and low cement pouring the sends density to be more than correspondence normally firebrick of makings, because pouring expect the aggregate that uses larger size, and pouring the aggregate proportion of makings is larger, and aggregate normally relatively matrix is more compact more wear-resisting.
Fireproof and pouring the substance appearance composition after makings drying and constituent structure and course barbecue, after high temperature is used is different, this also is indeterminate form pouring the characteristic of makings. In lab, tall aluminium is fireproof and pouring expect after heat treatment, the tall aluminium after higher temperature is pouring makings wearability is poorer.
And now a few pouring expect to remove wearability, it is carborundum will rise commonly pouring the wear-resisting function of makings. And a lot of pouring makings production manufacturer, more add black carborundum to change green carborundum, because of black carborundum 200 eye, and green carborundum 320 eye, combine the green carborundum after small powder technique especially, make pouring makings liquidity is good, wearability is stronger.
The sex that fight broken bits is a of firebrick main index, it is to show firebrick leaves resistance in high temperature slaggy erode and infrangible ability. Fight broken bits sex normally taller, fight slaggy osmotic stronger, service life is longer. Slaggy erode the process basically is fireproof material interior to invade (permeate) process. According to the chemical structure with different firebrick main component is the following 3 respects:
(1) is pure and deliquescent firebrick and slaggy the physics that does not produce chemical reaction is deliquescent action.
(2) reaction is deliquescent firebrick and slaggy in its interfacial place produces chemical reaction, make the change of working surface part of firebrick is low frit content (reaction child) and dissolve in broken bits, changed at the same time slaggy the chemical composition with goods.
(3) invades degenerative and deliquescent action, high temperature solution or slaggy invade fireproof material interior through air hole in, or the fluid photograph that passes fireproof data diffuses and produce solid to firebrick interior diffuse in the photograph, make the constituent structure of goods produces qualitative change and deliquescent.
Firebrick pledges according to soda acid sex different and main component is acidity, neutral and alkalescent firebrick, among them acidity firebrick basically is it is bases with Sio2; Neuter firebrick basically is to show the siliceous aluminium that is bases with AL2O3 and Sio2 is qualitative firebrick; Alkalescent firebrick basically is MGO is bases. Different composition firebrick fights broken bits to erode mechanism to be as follows:
Brick of charcoal of blast furnace hearth dissolves mediumly to molten iron attribute pure and deliquescent action namely.
The argillaceous brick in siliceous aluminous simple fireproof stuff is in slaggy medium deliquescent process basically is the reaction that produces in interfacial place deliquescent process. The fluid photograph viscosity that falls in high temperature as a result of argillaceous brick still very big, slaggy oxide is not easy in infiltration fluid photograph and amid diffuses, add glass to be mixed distributing equably the chemistry difference of the Mo Laishi fine grain in glass is not big, make them deliquescent thereby the difference of speed is not notable, liquefy process basically occurs on osculatory interface.
Of alkalescent firebrick slaggy erode the process is a model to invade degenerative and deliquescent process, bate condition is in in be like common magnesian simple product, after the magnesian qualitative matrix with chemical small stability and slaggy interaction, make among them oxide rich market rises, high temperature issues the constitutes viscosity and measure change as fluid photograph, can make fluid photograph passes air hole to move to the colder part of fireproof material interior, changed the chemical and mineral composition of firebrick and constituent structure thereby, the degenerative layer that forms chemical and mineral composition and constituent structure to differ around goods surface paragraph belt, quicken the attaint of goods thereby.
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