Phosphatic firebrick

Fireproof concrete compares the phosphatic wear-resisting brick that cement kiln shapes with machinery and the phosphate that pound dozen of vibration to shape the high temperature capability that the affiliation that reduced phosphate measured the close-grained sex that raised firebrick to improve firebrick. Can produce the firebrick with strict requirement of dimension of a brick lesser exterior at the same time. The high temperature character of this firebrick is comfortable at making material of line of cement kiln kiln.

Cement kiln chooses the proper technology that make with brick of phosphatic heat-resisting wear-resisting, for this we are opposite the main factor that affects wear-resisting brick performance undertook discussing.
1 grain constitutes the effect of pair of its function
The makings of part of the land that burn Ji that makes up phosphatic wear-resisting brick passes broken, screening, play the part of the high temperature capability with be ground better with achieving reasonable grain composition to make firebrick gets.
The critical makings that collect expects spends what press firebrick with class conjugate machine to shape density of function, wet porosity, bulk, compressive strength have immediate concern, also have certain effect to the loading softening point of firebrick. Think commonly density of porosity, bulk and compressive strength 3 person between the change that has regularity. Porosity is low density increases a volume, intensity also rises subsequently, and loading bate begins temperature to rise as the accretion of critical granuality however.
We use alumina of one class tall aluminium, inside rotary kiln, via the high temperature calcination that 1600 ℃ control, next broken the collect makings that with powdery wear certain material spends, because use machine pressing to shape, grain is too thick, shape performance is bad that adobe edges and corners falls off easily, close-grained sex differs defect of the demote below intensity. Accordingly we are used broken hind the collect makings under 5 millimeter. Chose at the same time among them a few composition one batch tries Yang to determine their wet porosity, wet unit weight offers the compressive strength after with 500 ℃ .
The experiment reachs when grain composition maintains 40~50% of 2# collect makings, fine pink 25~35% , firebrick has higher compressive strength, and the bulk density after 110 ℃ drying all can achieve 2.7g/cm3 above.
2 fine pink are fineness the influence to its function
Fine pink is ball mill abrade and become, its fineness have certain effect to firebrick function. Although fineness and meticulous intensity increases somewhat, but cementing agent joins a quantity to also want to increase, increase product cost to be opposite at the same time of firebrick be able to bear or endure temperature leap sex also has undesirable effect. Be like fineness and insufficient criterion intensity drops, fight abrasiveness to also be differred. For this we used the area that compare a list to be respectively 2420, 2960, the 3500 alumina fine pink with 4050cm2/g, with 1: Aluminous solution of 3.2 phosphoric acid makes cementing agent, group of aluminous collect feed becomes 4: 3: 3. In attrition the with 147MPa pressure on the machine that press a brick shapes, determine next its stability of the compressive strength after 500 ℃ are handled, unit weight, thermal shock and fight abrasiveness.
Test result makes clear the unit weight of test specimen and compressive strength to rise and increase finenessly as fine pink, when fine pink fineness accumulate 3500cm2/g than the surface more than, its intensity has bigger growth, fight abrasiveness to also have rise significantly. As a result of,this is fineness finer, the ability that counteractive office group destroys also increases subsequently but thermal shock stability (the influencing factor of R) is more and more complex it is concerned with the intensity limit of test specimen not only and mulberry of quantity of the coefficient of thermal conductivity with test specimen, stretch model, berth is compared and coefficient of expansion is concerned.
The experiment still shows alumina fine pink is fineness and unfavorable meticulous otherwise intensity drops the fineness and ordinary control of reason fine pink is in the thermal shock stability that has led congress to reduce firebrick the left and right sides.
3 shape the pressure influence to its function
We were used undermentioned a few kinds shape pressure (MPa)9.8, 49, 98, 147, 196, 243 after making test specimen, determine respectively its are wet capacity 110, the porosity after ℃ is handled and bulk density, the cold conditions compressive strength after 500 ℃ are handled and wearability.
Test result makes clear as shape the increases test specimen unit weight of pressure and compressive strength as rise, and porosity and wear rate as shape to rise and drop of pressure.
The quality grade to its function influence of 4 alumina
Make up, wear-resisting brick place is used main because producing area is different,former money stuff burns alumina, the chemical component that collect of aluminous alumina of its chemistry component and physical sex shoulder height expects and physical function also somewhat difference.
The influence of aluminous cementing agent of 5 different phosphoric acid to its function
For experiment phosphate cementing agent in 8 and. the different scale influence to firebrick quality. We made up respectively 1: 3.2, 1: 5, 1: Solution of 3 kinds of 10 different pH indicator shaped 3 groups of test specimen. The dose of knot of phosphoric acid alumna gel of different composition is right the influence of wear-resisting brick function.
Test result shows cementing agent comprises Al2O3/P2O5(rub Er is counted) different its microtherm solidify process may differ somewhat, but mix via the compressive strength after 500 ℃ heat treatment fight abrasiveness basic close. From reduce cost angle to consider, the cementing agent amount to of 3 kinds of composition is respectively into content of phosphoric acid of 85% pH indicator 60% , 75% , 90% . And with 1: The phosphoric acid dosage of agent of knot of alumna gel of 3.2 phosphoric acid is little, choose so 1: 3.2 cementing agent relatively other is comprised two kinds for the province.
The 6 additive influence to its function
The solidify speed that thinks phosphoric acid or makings of collect of alumina of cementation of phosphoric acid aluminous solution fall in normal temperature commonly applies very slow to facilitate construction is mixed often join Al(OH)3 of a few active additive, 3MgO·4SiO2·H2O, NH4F, AlF3·3H2O and tall aluminous cement to wait. Do the firebrick that presses a law to shape to whether also need to add a certain quantity of additive partly to using with improving it shape function and the inchoate strength that increase a brick, we use fireproof cement and northeast china ash (a kind of soft qualitative withered earth) had a test as additive.
After mud still is being stranded before the experiment makes clear a fireproof cement to no matter be stock,strand mud as additive, join all improper. Make additive think to be able to be improved commonly with clay shape function, and carry the intensity of the firebrick after senior officer dry significantly. Because 2 oxidation silicon, alumina mixes the active in clay,this is the result that phosphoric acid aluminous solution reacts each other.
Time of 7 tired makings reachs the temperature influence to its function
Because phosphoric acid or phosphoric acid aluminous solution can be mixed,a few iron in aluminous collect makings pledge reaction is given off hydric, make firebrick expands serious, influence firebrick quality uses the measure that adds a few acidity substance to prevent firebrick to expand accordingly craze. To solve its to expand we return the problem to used different tired mud time to have a test below different environment. Test result shows the wet material that uses half dry process still needs to expect tiredly, the environmental temperature that raises tired makings has the play that gets firebrick intensity, tired makings time is influential also to intensity at the same time, time is too short the result is bad, expect tiredly below experimental condition 16 hours of above, range of firebrick strength growth is bigger.
The influence of temperature of 8 different heat treatment to its function
Makings of collect of alumina of cementation of phosphoric acid aluminous solution issues solidify in normal temperature very slow, written guarantee as a result of phosphoric acid alumna gel in heat treatment process the chroma of agent itself develops circumstance and stability and heat treatment temperature only direct conjunction. We are opposite respectively experiment a processing that had all sorts of different temperature determine next its cold conditions is fought pressure, the weightlessness after water is boiled and loss of hot condition intensity and thermal shock stability.
Reach through the experiment wear-resisting brick adds heat treatment ability to form stabler result through 300 ℃ above only. Often be not stable under this temperature, because absorb the moisture in air easily to produce deliquescence to perhaps give aluminium of acerbity type phosphoric acid to cause a structure to destroy in Shui Zhongrong, make intensity drops, at the same time test result shows heat treatment temperature shoulds not be exorbitant when ℃ of temperature prep above later its thermal shock stability is reduced with respect to apparent ground.
For further research 1: The relation of the heat treatment temperature that collect of alumina of cementation of aluminous solution of 3.2 phosphoric acid expects and its compressive strength, stability and cementation sclerosis process. We the classics in water takes out a normal temperature of test specimen immerge that handles via all sorts of temperature to determine after 45 days the content of the PH value of water of its compressive strength and P2O3.
The ability after reaching from inside test result wear-resisting brick is being handled via 300 ℃ is stable. Handle temperature under the test specimen when 300 ℃ it is not stable. The heat treatment temperature that accordingly we think knot of phosphoric acid alumna gel is aluminous is not gotten under 300 ℃ , also do not answer tall 700 ℃ should be controlled commonly control in 700 ℃ .
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