Be made up by light qualitative fireproof aggregate and powdery makings, bond and additive and become but pouring shaping compound calls light qualitative heat insolation fireproof and pouring makings. Because pledge gently pouring makings bulk density is small, thermal conductance is low because this also says heat insolation is fireproof and pouring,expect. Press bulk density cent, heat insolation is fireproof and pouring makings can divide to pledge gently partly fireproof and pouring makings, bulk density is 1.0~1.8g/cm3; Pledge gently fireproof and pouring makings, bulk density is 0.4~1.0g/cm3; Super- pledge gently fireproof and pouring makings. Bulk density is <0.4g/cm3.
By use temperature cent pledges gently heat insolation is fireproof and pouring makings can divide it is 3 kinds:
Heat insolation of ① low temperature pledges gently fireproof and pouring makings, use temperature is 600~900 ℃ ;
Lukewarm heat insolation is light in ② qualitative fireproof and pouring makings, use temperature is 900, 1200 ℃ ;
Heat insolation of ③ high temperature pledges gently fireproof and pouring makings, use temperature is ＞ 1200 ℃ .
1) low temperature pledges gently pouring makings
Make up microtherm to pledge gently fireproof and pouring the raw material that stuff place uses basically has: Expand vermiculite, expand pearlite, diatomite and microtherm ceramists. Adoptable bond has mud of common silicate cement, aluminous acerbity brine and water glass to wait. Make up expand vermiculite is pouring when makings, expand vermiculite makings it is 1~8nnn normally, expand vermiculite collect makings and cement (silicate cement or mud of aluminous acerbity brine) Bikegen seizes mass bulk density and compression strength demand are diverse will adjust, average scale is (35~45) : (55~65) . Its bulk density is to follow expand of vermiculite content rise and reduce, meanwhile intensity and thermal conductance also are reduced. With expand density of the bulk after vermiculite can make up stoving is in in 0.4~0.6 G/cm3, thermal conductance 0.08~0.15W ／ (of M · K) pledge gently pouring makings.
Make up expand pearlite is pouring when makings, uses bond and expand pearlite is pouring makings is similar, usable also phosphate makes bond. When making bond with common aluminous acerbity calcic cement, expand pearlite (granuality 1~8mm) ; With cement quality comparing is (35~50) : (50~65) . Inside this scale limits, expand pearlite is pouring the physical function of makings is: Density of the bulk after 900 ℃ are burned is 0.5~0.9MPa for intensity of 0.3~0.7 G/cm3, compression, line change ratio is) of ％ of ~(0.6 ％ ~1.2, thermal conductance (700 ℃ ) for 0.06~0.18 W ／ (M · K) .
In 2) lukewarm pledge gently pouring makings
In making up lukewarm pledge gently pouring the raw material that stuff place uses basically has fly ash to float bead, clay pledges argillaceous brick makings, shaly ceramists, clay pledges qualitative poriferous grog, gently ceramists and siliceous aluminous fiber. Make up float bead pledge gently pouring the bond of makings can use aluminous acerbity calcic cement or phosphoric acid 2 hydrogen are aluminous. When making bond with aluminous acerbity calcic cement, but mix into person a few oxidation silicon are small pink (soot silicon) , deserve to compare it is roughly: Float bead cent of brick of ％ of 55 ％ ~70, light qualitative clay is ％ of 10 ％ ~20, aluminous acerbity calcic cement ％ of 3 ％ ~5 mixes small pink of silicon of ％ of 15 ％ ~25, oxidation the additive of minim. Float bead pledge gently pouring intensity of the bulk density of makings, compression and thermal conductance also are as pouring float in makings bead of content rise and reduce. Float for different bulk density below bead pledge gently pouring the manage of makings changes target.
With clay qualitative poriferous grog is made up pledge gently pouring when makings, the granuality composition of poriferous grog is ％ of ~50 of 10~5mm 40 ％ commonly, ％ of ~35 of 5~2.5mm 25 ％ , ％ of ~30 of 2.5~1.0mm 20 ％ . Matrix (pink expects) it is by aluminous acerbity calcium cement and argillaceous grog pink are comprised. Aluminous acerbity calcic cement adds a capacity is a basis compression intensity asks to adjust, compression intensity asks taller, cement adds a capacity bigger also. General aggregate compares with what pink expects for (55~65) : (35~45) . Usable also in aggregate float bead replace a share poriferous grog will adjust bulk density, right amount oxidation silicon small pink also can be joined to replace aluminous acerbity calcic cement in powdery makings, in order to form hydration and agglomeration compound union is pouring makings. Typical poriferous grog is made up pledge gently pouring arrange changes the plan below function rank.
In lukewarm pledge gently pouring makings except float bead pouring makings, poriferous grog is pouring makings use more outside, still have ceramists (shaly ceramists, clay ceramists) pouring makings, and by a few kinds in lukewarm light qualitative aggregate is compound those who make up is light qualitative pouring makings. In addition, also can use siliceous aluminous short staple to add argillaceous grog pink, with aluminous acerbity calcic cement or phosphoric acid 2 hydrogen aluminium adds hurried able agent and make super- in pledging gently lukewarm pouring makings.
3) high temperature pledges gently pouring makings
Make up the high temperature that can use in 1200 ℃ above to pledge gently pouring the raw material of makings has: Tall aluminium qualitative, Molaishi qualitative, silicon mixes qualitative, corundum character magnesium is qualitative wait for poriferous grog or abandon a brick gently to expect character, alumina, zirconia and Molaishi are qualitative hollow ball, contain qualitative fiber of chromium or aluminium of the silicon acid that contain zirconium, fiber of much brilliant Mo Laishi. But be restricted as a result of the problem place such as raw material origin and price, more tall still aluminium is used on industry at present Molaishi is qualitative, qualitative poriferous grog, the adoption of a few special use requirements alumina or zirconia are hollow ball and tall aluminous fiber and alumina fiber. Make up high temperature to pledge gently pouring the bond of makings has aluminium acid calcic cement, phosphoric acid 2 hydrogen aluminium, vitriolic aluminium and silicon collosol.
The Molaishi that is ％ of 65 ％ ~72, bulk density to be 1.00~1.25g/cm3 with Al2O3 content pledges poriferous grog makes acid of collect makings, aluminium calcic cement makes bond and be added have a few oxidation silicon the Molaishi that small pink makes up pledges gently character pouring. This kind pouring makings can use as directly the atmosphere furnace liner that 1350 ℃ use.
Be more than 98 ％ with Al2O3 content, hollow ball regards the alumina that natural accumulation density is 500~800g/L as aggregate, with α - Al2O3 expects as pink, the alumina that with aluminium acid calcic cement and reactivity alumina serve as bond to make up and becomes is hollow the ball is pouring arrange changes function to be as follows: Al2O3 content is more than 96 ％ ; Rear body of drying of 24h of 110 ℃ · accumulates Cm3 of density 1.3~1.6g ／ ; Compression intensity 3~8MPa; 1550 ℃ burn rear body to accumulate Cm3 of ／ of density 1.35~1.6 G; Compression intensity 4~12MPa, true porosity ％ of 55 ％ ~65; Thermal conductance (hot side temperature 1100 ℃ ) 0.9~1.1W ／ (M · K) . This kind pouring makings can use as directly high temperature (1500 ℃ of ＞ ) the working line of atmosphere furnace.
Pledge gently fireproof and pouring the applied range of makings is very wide, in the liner of facilities of the kiln furnace that waits for industrial department in metallurgy, mechanical, petro-chemical, electric power and building materials, hot project, flue and smokestack, use generally pledge gently fireproof and pouring makings as heat insolation (heat preservation) layer. But now as pledge gently fireproof and pouring makings material raises the progress with preparation technology character, also many circumstances use as directly the working line of atmosphere furnace kiln. General low, medium lukewarm model pledge gently pouring makings is main make adiabatic line, do not contact with blaze directly. And high temperature pledge gently pouring makings, having is to use as directly for the most part very the working line that does not contact with the fuse-element inside furnace or solid medium. Can use the working line that makes all sorts of heating furnace and heat treatment oven especially, can save specific power consumption greatly.
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