Brick of corundum of electric frit zirconium gets erode main component to be physical action and chemistry. Physical action is to show wall of pool of vitreous frit kiln is running a course for a long time in, endure the concussion of urgent cold urgent heat repeatedly, its surface layer experiences the metabolic process that systole expands necessarily. Because exhaustion is excessive,the structure that brings about brick of corundum of electric frit zirconium is destroyed, cause increase of surface layer cranny, the structure is loose. Accordingly, erode in air current, stock and vitreous fluid action falls and craze, flake, and this one process can repeat ceaselessly undertake.
One, erode mechanism
Chemistry is eroded to brick of corundum of electric frit zirconium more complex and acuteness, can divide into 4 respects:
1, the separate out of vitreous photograph
The effect that brick of corundum of zirconium of frit of pool wall report suffers fluid of high temperature glass for a long time (> 1500 ℃ ) , the glass inside one party face brick encounters gradually melt separate out (temperature of Zui low separate out controls) for 1150 ℃ ; The stoma of body of meeting edge brick, cranny invades the alkalescent glass juice that contains Na2O on the other hand inside the brick, diffuse with the vitreous photograph of separate out, permeate each other, make the vitreous fluid viscosity of separate out is reduced consequently, fluidity rises, make erode behavior aggravate then, expand to depth.
2, framework is damaged
As vitreous fluid to depth erode aggravate, the framework that makes bricky system is mineral also be contained gradually the soak of vitreous fluid place of Na2O, surround, framework also begins to be eroded. Be decomposed to be α by deliquescent Molaishi above all - Al2O3 and SiO2, make α again then - Al2O3 turns for β - Al2O3. The elevatory β as temperature - Al2O3 dissolves entirely in vitreous fluid, crystal lattice of inclined zircon, corundum also is destroyed, then be in harmony of dissolve of disintegrate, disintegrate, part. β - Al2O3 dissolves stage by stage below high temperature in glass, be come down by reservation rarely, as glass diffuse ceaselessly permeate, inclined zircon is microcrystalline become free state, one part is taken away along with vitreous fluid, the likelihood makes vitreous stone, one part is come down by reservation. Inclined zircon although can dissolve enters glass in, but solubility is very small, as the wave motion of temperature, zrO2 from inside vitreous fluid fast crystallization, form crystal of inclined zircon of framework shape or shape of a string of beads.
3, new mineral crystallization
Because the framework of bricky body is mineral partial melt in vitreous fluid, changed the class status of former glass fluid. Accordingly, when the theory that is close to Yu Xia stone when the ratio of the SiO2-Al2O3-Na2O in vitreous fluid is comprised, have many nepheline crystal separate out.
Nepheline of Al2O3+2SiO2+Na2O → 2NaAlSiO4()
4, of nepheline invade caustic
Because the density of nepheline is less than the density of bricky body, because this is in crystal of separate out nepheline while, accompanying what accumulate more roughly to expand, make bricky system structure loose. Although the melt of the photograph crystallizes to be able to make vitreous fluid viscosity rises partly in the brick right now, to loose structure certain felt protects action, but still cannot hold back the air current inside kiln, stock and vitreous fluid completely to erode the action with gravity, and craze, flake enter vitreous fluid, form vitreous stone. After flaking achieve a face to continue to get of vitreous fluid erode, erode and continue to flake. Bring about brick of corundum of electric frit zirconium necessarily as a result erode, disintegrate.
2, lengthen brick of corundum of electric frit zirconium the service life in vitreous electric smelter
Well-known, level of vitreous pool kiln is fused, level of makings fluid face is mobile, except throat place of explicit three-phase interface is eroded serious, if pursue,1 is shown. Vitreous electric smelter is perpendicular and fused, it is cold top fuses for the most part, vitreous fluid face is born to expect the layer is enclothed by, have less three-phase interface appear. Because be perpendicular and fused, to the pool the brick erodes the wall to be centered in three-phase interface no longer, however whole is eroded, so the weak point of brick of electric frit corundum is eroded breach, detailed sees sketch map.
Erode mechanism in the light of brick of corundum of electric frit zirconium, want to control the content of the Na2O in composition of raw material of brick of corundum of electric frit zirconium strictly above all, the content of the Na2O in 33#WS of national level requirement is in 1.45% the following, the content of the Na2O in 41#WS is in 1.3% the following, the content of the Na2O in 33WS of requirement of standard of my company electric smelter is in 1.35% the following, the content of the Na2O in 41#WS is in 1.05% the following.
In the light of the graph of 2 erode place, requirement rising head and beard of bricky material scale achieve 1.5:1, pass the pressure that rising head expects, reduce the stomatic remain in bricky material effectively, enhance material of brick of the place that note a mouth to fight erode ability, and the requirement notes a mouth remain without apparent shrinkage cavity.
In the light of the graph of 3 erode place, in brick of corundum of electric frit zirconium brick of the tightened inspection in assembling a process is seamed, the requirement is under 0.3mm, in process of the kiln that bake control each position strictly expand difference, assure the exact extent that the brick in the process seams, reduce gas to enter thereby, prevent to be seamed in the brick place form three-phase interface, reduce a figure of 3 place erode.
In the light of the graph of 4 place erode, the width of brick of the requirement in designing a process is less than 400mm, too wide meeting brings about bricky material interior remain of existence shrinkage cavity is much, in-house and loose; Requirement rising head and beard of bricky material scale achieve 1.5:1, pass gas of pressure, eduction to lead, improve quality of bricky material interior; Kiln furnace runs later period to reduce heat preservation, through dropping bricky material temperature, reduce erode speed.
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