Lime perpendicular kiln is told simply with firebrick make a structure compact next makings belts that do not stick calcic limekiln firebrick are to wear away the fiercest area, because this area temperature is not too tall, but erode namely the gender is fiercer. When choosing firebrick so, should choose the firebrick with stronger wearability. Considering cost issue, choose the argillaceous firebrick with inferior porosity normally. Because its structure is compact, use in this place to be able to prolong the service life of bricky line so, avoid the needless loss that because of changing often firebrick causes.
So how does manufacturer undertake to limekiln firebrick when produce reasonable deserve to compare, the porosity that ability of what kind of production methods assures its are inferior. Below introduce simply. Burden introduces for us below advertent item:
1, normally the chemistry of firebrick burden is formed must satisfactory its request, and the index request that should compare it is some taller, changing in forming, have include right advocate the promises a quantity regulation of gross of impurity of the content of composition, Yi Rong and harmful impurity.
2, now normally of firebrick magic art of half dry suppress is chosen normally in production, it requests the connection sex with its due and contented preform, because this is in burden,should |contain a lot of connection composition.
3, when normally firebrick raw material contains a lot ofcomposition and discretionary reduction composition, make raw material, burden and its chemistry is formed between present conversion concern.
About the burden of firebrick is normally advertent item, we understand requirement, so be opposite its burden when can avoid to present a few problems, also more benefit at him construction. Normally firebrick production goes out may present air hole, want to handle this issue, we understand its porosity with respect to demand, so how to drop normally the porosity of firebrick, we are below brief introduction:
The choice sends density the raw material with tall, bibulous low rate, passing reasonable grading is to be made low stomatic normally the crucial point of firebrick. Normally limekiln firebrick is to use the soft qualitative clay of 50% and grog of 50% horniness clay, by sure granuality the requirement has burden, via shaping, dry hind, firing below the high temperature of 1300~1400 ℃ . Its mineral resources makes chemical part main content is kaolinite (Al2O3·2SiO2·2H2O) the impurity with 6%~7% (the oxide of potassium, natrium, calcic, titanium, iron) . Firing the process basically is kaolinite break water become divided to generate Molaishi ceaselessly (3Al2O3·2SiO2) crystal process. Normally the SiO2 in firebrick and Al2O3 are in firing form with foreign matter in the process in all the silicate of brilliant low melting point, surround it is all round Mo Laishi crystallization. Normally control is in highest temperature in fire process 1350 ℃ ～ 1380 ℃ , carry concave and convex stoma appropriately argillaceous brick is firing temperature (1420 ℃ ) , normally firebrick shortens increase somewhat, make the density of firebrick has a bit thereby increase, low porosity is able to drop. Additionally use Jiao Baoshi serves as raw material to also can reduce the porosity of firebrick significantly.
The classification of limekiln basically has quadrate kiln and circular kiln, according to fire products classification can be divided again wait for kiln of limekiln, pottery and porcelain, cement kiln, glass kiln, tile kiln. All sorts of kiln furnace cardinal principle can be divided for 3 parts, 1, warm-up belt. 2, to calcine belt. 3, cooling zone.
Warm-up belt is in roof coping commonly, use temperature is not high, but when devoted goods cause easily to firebrick wear away acutenessly, and, heat vital energy can cause serious chemistry to erode action to firebrick. So warm-up takes firebrick to must have a few property:
(1) send density tall.
(2) compression intensity is high.
(3) wear-resisting performance is good.
(4) can good to slaggy corrosion resistance.
(5) fight flake capability is strong.
Although warm-up belt uses firebrick not tall to the requirement of temperature, but particularly slashing to the other performance demand of firebrick.
To calcine belt. To calcine belt is goods and limekiln produce the region with chemical the strongest reaction with firebrick, at the same time to calcine belt also is the region with working highest temperature. So limekiln must want to have a few character with firebrick:
(1) fireproof degree tall.
(2) heatproof shake performance is good.
(3) corrosion resistance can be good.
(4) wear-resisting performance is good.
Previously, to calcine belt uses tall aluminous firebrick or argillaceous firebrick commonly, but the research result surface of the near future, the alkalescent firebrick effect with introduce chemical stability can good will be much better. But, to calcine belt also is not to use alkalescent firebrick entirely, standing by the place of warm-up belt and cooling zone, wearability can be more more important than corrosion resistance, use wear-resisting property so the tall aluminous firebrick with good, fireproof high temperature.
Cooling zone. Because burn,very high quantity of heat still is contained to move back and forth when good lime enters cooling zone, the firebrick of cooling zone should have the following property most:
(1) good wearability.
(2) fight urgent cold urgent hot sex.
(3) fight goodly flake quality.
1, dry, warm-up takes heat
The firebrick that the dry belt of roof ministry uses, in temperature side issue not quite. But devoted limestone causes intense wear and tear, and, firebrick erodes ability to furnace is able to bear or endure angrily crucial also.
Warm-up takes firebrick to must have the following quality:
A, have compact organization;
B, have good wearability;
Strength of C, compression is great;
D, wait to coming from CO, SO2, Cl2 erode, the counteractive ability that genuflect influences is great;
E, right of dissolve broken bits be able to bear or endure corrode sex is strong;
F, have fight enoughly flake the gender is waited a moment.
Although warm-up takes firebrick to ask to have afore-mentioned property at the same time, but so far, every is compact the firebrick with gender, good wearability often is fought flake the gender is very poor. Very difficult be satisfactory to both sides.
2. To calcine belt
Limestone is decomposed, the chemical reaction of lime and bricky line all happens in to calcine belt, at the same time to calcine takes fireproof channel makings to still bear drop of charging wear away. To calcine takes firebrick choose should special attention fights lime and the function that its react, ask to should take Xin to react not easily with lime with firebrick namely, its organize a structure to want to stabilize.
To calcine takes firebrick to should have the following property:
(1) is fireproof degree tall;
(2) corrosion resistance is good;
(3) wearability is good.
(The organization below condition of 4) high temperature is stable;
Previously, to calcine belt uses SiO2—Al2O3 to fasten qualitative firebrick of argillaceous brick and tall aluminous firebrick or silicon line stone all the time, but already used recently as little as lime reaction, the alkalescent firebrick with chemical good stability. The reaction of the firebrick that to calcine takes and lime, conclude commonly in the circumstance that fastens firebrick with SiO2—Al2O3 generate mineral it is calcic feldspar, calcic (aluminous) Huang Changshi. The main reason that firebrick corrodes is with lime reaction makes vitreous appearance, it is permeated to the interior of firebrick, destroy the union between grain, erode stage by stage. Using the occasion of argillaceous brick, of vitreous photograph generate quantity comparing to pledge with tall aluminium with silicon line stone pledges when firebrick much, corrosion resistance needs friend, but make bricky porosity is reduced show the quite great ability that fight corrode. Consequently, should use compact qualitative firebrick to be able to bear or endure in order to rise corrode sex. When using alkalescent firebrick, the magnesian olivine 2MgO in the brick, SiO2 and lime react, with chromic mine subsequently reaction generates calcic magnesian olivine (CaO. MgO. SiO2) and magnesian wollastonite, magnesian Huang Changshi, 2CaO. Fe2O3 wait and decompose chromic mine, advance so erode. But compare with SiO2—Al2O3 department, below coequal temperature, the rate of these reaction is very slow, show be able to bear or endure exceedingly goodly corrode sex. Because the composition of firebrick and lime are belonged to likewise,this is alkalescent, produce chemical reaction hard. However, because press alkalescent brick,a large number of use chromic magnesium pledge firebrick produces blowout and organization fragile change. By come off and wear away and gradually loss, so, to farther seek long life is changed and was used magnesium pledges or magnesian pointed spar pledges firebrick.
To calcine belt also is not use alkalescent brick inside whole range. Around the part that approachs warm-up area and cooling zone, compared with be able to bear or endure corrode sex will take wearability seriously more, qualitative firebrick of the tall aluminous firebrick with must use wearability good consequently or silicon line stone.
3. Cooling zone
Because burn good lime to contain shift of quantity of heat of quite a few, be cooled, so use wearability of cooling zone need is able to bear or endure with what fight urgent cold urgent heat flake the firebrick with exceedingly good sex. Cooling zone firebrick must have the following property: A, admirable wearability; B, admirable be able to bear or endure flake quality; C, have compact organization to wait.
Use close qualitative wearability tall aluminium pledges and clay is had character be able to bear or endure flake sexual firebrick. To firebrick character, cooling zone is decided the sort of injury of furnace whole life rarely.
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