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硅莫磚產品知識介紹

時間:2018-08-22 17:41 來源:耐火磚廠家點擊:

  硅莫磚(Silicon mo brick)在水泥窯應用時因外觀偏紅,所以有個硅莫紅磚的別稱,但是呢,硅莫磚在其他行業應用時是不能這么叫的,下面請看詳細介紹。
 

硅莫磚
 

  硅莫磚(Silicon mo brick)以特級高鋁礬土熟料和紅柱石及碳化硅和特級均化礬土為主要原料組成的經高壓成型、高溫燒制而成的耐火磚。

  Silicon motile is a kind of refractory brick made of high grade alumina clinker, red pillar, silicon carbide and high grade alumina.

  硅莫磚中的“硅”指碳化硅,“莫”指莫來石,其實,硅莫磚是以高鋁礬土、碳化硅為主要原料,通過燒結制出的耐火磚。本質上,硅莫磚只是一種添加了碳化硅的高鋁磚。其中,一些產品可能摻有莫來石、“三石”、剛玉等耐火原料。碳化硅在超高溫、強還原條件下,由碳和二氧化硅發生反應合成。合成的特點是碳粒不動,SiO2和中間物質(SiO、Si)先變成氣相再和碳接觸并發生反應。

  "Silicon" in silicon motile refers to silicon carbide and "mo" refers to mullite. Actually, silicon motile is a fireproof brick made by sintering with high bauxite and silicon carbide as the main raw materials.Essentially, silicon mullite is just a high alumina brick with silicon carbide added.Among them, some products may be mixed with mullite, "three stones", corundum and other fire-resistant raw materials.Silicon carbide is synthesized by reaction of carbon and silicon dioxide under the condition of high temperature and strong reduction.The synthesis is characterized by the immobility of carbon particles, with SiO2 and intermediate (SiO, Si) first becoming gas phase before contacting carbon and reacting.

  在高鋁磚中加入碳化硅,則提高了材料的熱導率,降低了材料的熱膨脹系數。從而,可以顯著改善高鋁磚的抗熱震性。碳化硅氧化后形成SiO2和CO,SiO2再和Al2O3反應形成莫來石。這兩個反應都伴隨很大體積增加。反應產物莫來石也具有良好的高溫性能。所以,適量加入碳化硅有助于補償耐火磚的重燒收縮,提高荷重軟化溫度和抗蠕變性。早,西方國家的技術人員認為水泥窯中高鋁磚的上限使用溫度為1300~1350℃。如果超過1300℃,水泥熟料中的CaO和耐火磚中Al2O3、SiO2反應形成的富含CAS2、C2AS產物將被燒流,失去保護的耐火磚將很快損毀。因此,水泥窯高溫帶包括燒成帶和過渡帶都需要使用堿性磚。

  Adding silicon carbide into high alumina brick increases the thermal conductivity and reduces the coefficient of thermal expansion.Therefore, the thermal shock resistance of high alumina brick can be significantly improved.SiO2 and CO are formed when silicon carbide is oxidized, and SiO2 reacts with Al2O3 to form mullite.Both of these reactions have large volume increases.Mullite also has good high temperature performance.Therefore, appropriate amount of silicon carbide can help to compensate the heavy burning shrinkage of refractory bricks, improve the softening temperature under load and resist the creep.First, technical personnel in the west think of high alumina brick cement kiln ceiling using temperature is 1300 ~ 1350 ℃.If more than 1300 ℃, the CaO in cement clinker and refractory brick of Al2O3, SiO2 reaction to form rich CAS2, C2AS product flow will be burning, lose protection brick will soon break.Therefore, alkaline bricks are needed in high temperature zone of cement kiln, including firing belt and transition belt.

  硅莫磚根的尺寸多樣化,分為標準型、正方形、異型。標準型硅莫磚尺寸為230*114*65mm,正方形和異型尺寸可根據用戶需求來圖加工。

  Silicon motile roots are of various sizes, divided into standard, square and different types.The size of standard silicon motile is 230*114*65mm, square and special size can be processed according to the user's requirements.

  在水泥回轉窯的次燒成帶和過渡帶的使用壽命優于尖晶石磚,主要原因是尖晶石磚在使用中由于堿侵蝕而形成侵蝕段帶,造成熱面產生裂隙和剝落而加速損毀。而硅莫磚結構致密,莫來石和SiC晶體穩定,加上磚面形成連續的SiO2致密層,阻止了氣體和熔融物的侵蝕。加上SiC的熱導率高、熱膨脹系數小,制品的熱抗震穩定性好。這些性能特點使硅莫磚不易斷裂和產生剝落,而且由于熱導率低于鎂質材料,使筒體受熱不致過高,這不僅保證了回轉窯筒體的正常運轉,而且節約了燃料。

  The service life of the secondary sintering zone and transition zone of the cement rotary kiln is better than that of the spinel brick, and the main reason is that the spinel brick forms the erosional zone due to alkali erosion in use, resulting in cracking and spalling on the hot surface and accelerating damage.However, the silicon motile structure is dense, the mullite and SiC crystals are stable, and the brick surface forms continuous SiO2 compact layer, which prevents the erosion of gas and melt.In addition, SiC has high thermal conductivity and low thermal expansion coefficient, and its thermal seismic stability is good.These properties make silicon motile not easy to break and flake, and because the thermal conductivity is lower than the magnesium material, the tube is not too hot, which not only guarantees the normal operation of rotary kiln tube, but also saves fuel.

  產品特點

  Product features

 ?。?)耐高溫、荷重軟化溫度高。

 ?。?) high temperature resistance and softening temperature under load.

 ?。?)耐酸性溶液或熔渣侵蝕性強。

 ?。?) strong resistance to acid solution or slag corrosion.

 ?。?)抗熱沖擊性、耐磨性優良。

 ?。?) excellent thermal impact resistance and wear resistance.

 ?。?)常溫耐壓強度高。

 ?。?) high compressive strength at room temperature.

 ?。?)熱膨脹系數小,熱導率低。

 ?。?) low thermal expansion coefficient and low thermal conductivity.

 ?。?)使用過程中不斷形成保護層,減少結圈。

 ?。?) protective layer is continuously formed in the process of use to reduce the knot ring.

  硅莫磚的品種和性能硅莫磚是一種高鋁碳化硅質耐火磚。若在硅莫磚中再添加不同的特種耐火原料,還可以繼續提高硅莫磚的某些性能,也就可以將改性后的硅莫磚分成不同的子類。例如,在硅莫磚制磚料中用一部分紅柱石代替礬土,可以制出硅莫紅磚。硅莫紅磚除具有良好的耐高溫、耐侵蝕性外,還具有比硅莫磚更好的抗熱震性。很多水泥工廠的實踐證明:硅莫紅磚或硅莫磚用于5000t/d新型干法水窯的上過渡帶可以獲得12個月的壽命;用于2500t/d新型干法水泥窯的上過渡帶,可以獲得1~2年的使用壽命,相當于鎂鋁尖晶石磚的150%~200%。

  The variety and performance of silicon mo brick is a kind of high aluminum silicon carbide refractory brick.If different special refractory materials are added to silicon motile, some properties of silicon motile can be further improved, and the modified silicon motile can be divided into different subclasses.For example, a silicon mo brick can be made by replacing bauxite with a portion of red pillar stone.Silicon red brick not only has good high temperature resistance and erosion resistance, but also has better thermal shock resistance.Many cement plants have proved that the upper transition zone of simoir red brick or simoir brick used in the new dry method water kiln of 5000t/d can obtain a life span of 12 months.The upper transition zone used in the new type 2500t/d dry cement kiln has a service life of 1 ~ 2 years, which is equivalent to 150% ~ 200% of magnesia/alumina spinel brick.

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