Hollow ball brick produces alumina craft:
Alumina is hollow the formation of the ball the process is alumina frit fluid blow in high-pressured air gush, the process also is a fast refrigeration, contractive process actually, the melting point of alumina is 2050° ℃ , comfortable answer at blowing the temperature of the ball ℃ of 200-300 of prep above melting point, need to heat namely 2200-2300 ℃ C, blow if the temperature of blaze fluid is low easily into large wall ball or beehive shape hollow ball. Interior of high temperature liquid contains particular aeriform branch to press, this kind of cent pressing quickens high temperature liquid Peng Man , it is the main factor that hollow ball forms stimulative alumina. Electric frit corundum piece can see in makings have many alveolate air hole. Corundum of frit of report of state of calm grain is arenaceous (3 ー 5mm) apparent pore rate also is in 10 ％ - 15 ％ are left in from this, can explain frit fluid interior has larger aeriform fraction to press existence. Cent presses the gas that forms interior of fluid of high temperature frit to basically have two sides: It is to be in electric frit process firstly, when joining farinaceous industry alumina, in the partial air that brings when the operation, divide aeriform remain to be inside fluid of high temperature frit via there still is a department after electric frit, beehive shape air hole is being formed in cooling process is to be in electric frit process secondly, all sorts of
Change thing especially oxide of low melting point, in electric frit process, rise gradually volatilize speed. The aeriform cent that the volatilization of fluid of this kind of frit can add liquid interior is pressed. If change aluminium to begin to have in 1750 て above,volatilize, volatilize to 2300 ℃ above quantity is big.
Blow make alumina hollow ball:
1, fused phase, raise temperature, reduce the viscosity that earth up fluid.
2, the phase that play a ball.
3, refrigeration changes level.
The bulk systole that the mechanism that hollow ball forms oxidation photograph is the fast refrigeration after gush of classics of fluid of frit of an alumina high temperature is blown changes process, this process is oxidation exceeds frit fluid to be followed in high-pressured airy play effect, be blown into countless small fluid, these small fluid are in sky, answer with the line of parabola below, in this campaign process, small fluid acts to fall in exterior tension and the action that leave mental efforts, form ball of a roundlet first, get when roundlet ball suddenly cold, face of the generation when the surface is changed, and sphere interior still is in liquid condition, below action of tall mental efforts, at the same time frit fluid produces very large volume to close again, the fluid after making immediately, country of very even ground is outside hollow ball on, completed the whole process becoming a ball of hollow ball thereby.
Alumina is hollow ball brick is characteristic:
1, can amount to 1750 degrees of above, thermal stability is good. Ratio of the heavy change that burn a line is small, use longer.
2, optimize a structure, reduce weight of body of heater:
Using high temperature resistant material belongs to density of bulk of heavy qualitative brick to be 2.6-3.0g/cm, and hollow ball brick has alumina only 1.2~1.7g/cm, same one stere bulk, hollow ball brick can reduce use alumina 1.1-1.9 ton weight.
3, managing material:
Reach same use temperature, if use heavy qualitative brick its price and alumina are hollow ball brick price comparatives, and still need quite considerable heat-insulation layer fireproof material. If use alumina hollow ball brick, every stere can save 1.1-1.9 ton the use quantity of heavy qualitative brick, can save the fireproof insulation material of 80% more.
4, economic energy resources:
Hollow ball has alumina apparent heat preservation is characteristic, coefficient of thermal conductivity is low, can have very good heat preservation effect, reduce quantity of heat to send out, improve thermal efficiency, have the objective of managing the sources of energy thereby. Energy-saving effect can amount to 30% above.
Alumina is hollow ball brick index:
|
Eye |
Alumina is hollow ball brick |
||
|
Model Date |
85 bricks |
90 bricks |
99 bricks |
|
℃ of highest use temperature |
1680 |
1700 |
1800 |
|
Al2O3 % |
≥85 |
≥90 |
≥99 |
|
SiO2 % |
≤15 |
≤8 |
≤0.2 |
|
Fe2O3 % |
≤0.2 |
≤0.2 |
≤0.2 |
|
Bulk density G/cm3 |
1.4-1.7 |
1.4-1.7 |
1.4-1.7 |
|
Normal temperature compression spends MPa |
≥12 |
≥10 |
≥9 |
|
Loading bate begins temperature ℃ (0.2 MPa) |
≥1650 |
≥1700 |
≥1700 |
|
Weigh ratio of the change that burn a line % (1600 ℃ ×3h) |
±0.3 |
±0.3 |
±0.3 |
|
×10-6 of hot coefficient of expansion (room temperature - 1300 ℃ ) |
～ 7.8 |
～ 8 |
～ 8.6 |
|
W/(m.k) of coefficient of thermal conductivity (average 800 ℃ ) |
≤0.6 |
≤0.7 |
≤1.5 |
Get Price
WhatsApp