Decide the element of firebrick price:
1: Firebrick contains aluminous amount
2: Firebrick manage changes target
3: Firebrick fights broken bits sex
4: Firebrick is fireproof degree
5: Manufacturing environment
Al2O3 content is more than a general designation of siliceous aluminous simple fireproof stuff of 48% to pledge for tall aluminium fireproof material. Its finalize the design the product is furnace of hot project kiln namely most the tall aluminous brick that Chang Chong moves. Press Al2O3 content more or less to differentiate, tall aluminous brick can divide for 3 grade:
One class: Al2O3 > 75%;
2 class: Al2O3 65% ? 70%;
3 class: Al2O3 55% ? 60% .
Difference of respect of price of tall aluminous brick is very big, from more than 1000 to more than 2000 differ, content of main basis Al2O3 will distinguish price of tall aluminous brick.
It is according to mineral composition classification: Are low Molaishi and Molaishi qualitative (Al2O348% ? 71.8%); Mo Laishi - does corundum reach corundum character - is Molaishi qualitative (Al2O371.8% ? Is 95%); corundum qualitative (Al2O395% ? 100%) . The limits of 71.8% is less than in Al2O3 inside, along with the addition of Al2O3 content, in high aluminous qualitative products advocate brilliant photograph Mo Laishi increases; to be more than the limits of 71.8% in Al2O3 inside, along with the addition of Al2O3 content, Molaishi the amount decreases and the amount of corundum increases. The fireproof function of goods follows Al2O3 content rise and rise.
Tall aluminous brick is to point to the agglomeration goods that the aluminous silicon acid that contains Al2O348% above pledges or pure alumina pledges. General tall aluminous brick contains Al2O3 80% the following, contain Al2O3 to be in of 80% above call corundum brick.
Tall aluminous brick and clay brick photograph are compared, outstanding advantage is fireproof degree reach loading bate temperature tall.
(1) is fireproof degree
Of tall aluminous brick fireproof degree of fluctuant range is big, be I770 commonly? 2000 ℃ , basically suffer the effect of Al2O3 content, rise as the addition of content of the Al2O3 in goods. At the same time fireproof degree of effect that still suffers matter content and sort, concern with the mine photograph structure of goods, see a table 1.
Those who express 1 high aluminous qualitative products is fireproof degree with mine photograph structure
(Temperature of 2) loading bate
Bate of loading of tall aluminous brick begins to be out of shape temperature is more than 1400 ℃ , rise as the addition of Al2O3 content. Al2O3 content is less than the goods of 71.8% , loading bate temperature depends on the quantitative scale of Molaishi and vitreous photograph, follow Mo Laishi measure increase and rise. The amount of vitreous photograph and property have apparent effect to loading softening point. Al2O3 content is 71.8% ? 90% when for simple product of Molaishi, corundum, along with the addition of Al2O3 content, vitreous photograph amount is basic and fixed, although corundum has increase, but Molaishi has however reduce temperature of bate of; reason loading rise not remarkable. After Al2O3 content exceeds 90% , along with the addition of Al2O3 content, vitreous photograph amount decreases, loading bate temperature rises significantly, rise by the 1630 ℃ when Al2O390% to the 1900 ℃ when Alz03100% , loading bate temperature carries ' along with the addition of Al2O3 content tall.
(3) thermal conductivity
High aluminous qualitative refractory products has higher heat conduction capacity than sticky earthy goods. Its reason is ability of the heat conduction in high aluminous qualitative products very low glass photograph is less, and the Molaishi with heat conduction better ability and quantity of corundum qualitative crystal increase, increased the heat conduction capacity of goods. Thermal conductance lifts along with temperature and reduce.
The thermal conductance of tall aluminous brick and clay brick and silica brick are different. The thermal conductance of tall aluminous brick lifts along with temperature and reduce. Should contain in tall aluminous brick when Al2O3 is taller, crystal of its Molaishi, corundum is more, the liability that thermal conductance lifts along with temperature and reduces is more apparent. But in 1000 ℃ above, its drop extent is reduced. And the thermal conductance of clay brick and silica brick lifts along with temperature and rise, show linear concern, also do not have a change around 1000 ℃ . When normal temperature, is tall aluminous brick bigger than clay brick thermal conductance 2? 3 times, but in 1000 ℃ above its thermal conductance is basic close.
The variety with not high content of the Al2O3 in tall aluminous brick is on loading softening point and heatproof concussion sex as similar as clay brick. But as Al2O3 content heighten, loading softening point and heatproof concussion sex lift gradually. These characteristics of tall aluminous brick, the high temperature that makes its make clay brick, because this can be used at the high temperature place of vitreous frit kiln. The assortment with small porosity can be used in the high temperature place of regenerator, be like regenerator Xuan top and upside wall. The main character of tall aluminous brick sees a table 2.
Corundum brick has agglomeration law and electric frit to burn casting method by production methods two kinds. Agglomeration corundum brick is fireproof degree can amount to 2000 ℃ , use can amount to 1800 ℃ , but its heat is expansile big, with porosity identical Molaishi pledges fireproof material is compared, its fight thermal shock sex to differ.
Tall aluminous firebrick is 3 oxidation 2 aluminous content are in a kind of siliceous aluminium of 48% above is qualitative fireproof material. Have thermal stability tall, fireproof degree in 1770 ℃ above. Fight the characteristic with broken bits better sex. It is by alumina or other alumina content taller raw material classics shapes to be become with to calcine. Except common still have outside tall aluminous brick other brick of tall aluminium of a few kinds of sort:
1. Gao He is soft tall aluminous firebrick
Gao He soft tall aluminous brick and common photograph of tall aluminous brick is compared, matrix part and bond portion are different: Matrix part is divided add 3 stone concentrate besides, according to the chemistry after burning composition is close to academic composition of Molaishi, reasonable introduced expensive aluminous stock, wait like pink of corundum pink, tall aluminous corundum; Bond chooses clay of high grade ball to wait, inspect breed to differ use different clay compound bond, not perhaps come stone bond. Adopt afore-mentioned methods, the loading bate temperature of tall aluminous brick can raise 50~70 ℃ left and right sides.
2. Firebrick of low creep tall aluminium
Through using so called did not balance reaction to come to those who raise tall aluminous brick fight creep function. Namely the use temperature circumstance according to kiln furnace, 3 stone are added in matrix alumina of mineral, activation, making the composition of matrix adjacent or complete is Mo Laishi composition, because of matrix not come petrifaction, be sure to raise the Mo Laishi content of material, reduce vitreous photograph to contain in, and Molaishi actors or actress the function of mechanical, heat of different is helpful for material high temperature capability rise. Not come to make matrix complete petrifaction, controlling Al2O3/SiO2 is crucial. Tall aluminous brick applies low creep extensively at the furnace of hot project kiln such as hot-blast stove, blast furnace in.
3. Phosphate combines tall aluminous firebrick
Phosphate combines tall aluminous brick is as a result close fancy or aluminous grog is one class tall aluminium main raw material, phosphatic solution or phosphoric acid aluminous solution are bond, after shaping through doing law machine to press partly, the chemistry that makes at 400~600 ℃ heat treatment combines firebrick. It is belonged to do not bake bricks, systole of the goods in using a process to avoid to be in is bigger, general need introduces in burden heat expansile raw material, wait like La Pinshi, silica. What be united in wedlock with pottery and porcelain is firing photograph of tall aluminous brick is compared, its are fought come off performance is better, but temperature of its loading bate is inferior, fight aggressivity can poorer, because this sluggish wants to join a few electric frit corundum, Molaishi, with aggrandizement matrix. Phosphate combines tall aluminous brick to apply extensively at roof of cement rotary kiln, report to wait for kiln furnace place.
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