Argillaceous brick can bring about finished product percent of pass because of a variety of elements when production too low, pass related side law to be able to promote, detailed introduction looks please below.
Argillaceous brick makes obsolete matter: Argillaceous brick dimension is unqualified, because mould installation is not firm, pattern plate is mobile; If enter,expect quantity wave motion is bigger, also can cause the change of blank dimension. Produce a crackle and crackle. Shape when the operation, brick not according to first light hind heavy principle is made. Air does not have eduction below initiative pressure, fall in pressure next agile. Slop moisture is overmuch. Mixture is inhomogenous. Inhomogenous meeting brings about pattern plate base substrate layer is cracked or crackle.
Screwy. Pattern plate uses time to grow too, pattern plate is out of shape, adobe is out of shape. Slop moisture is overmuch, adobe nature is out of shape, bring about base substrate to be out of shape. Be short of an edge to take off horn. Because clay sculpture sex is poor, grain slants analyse, enter horn is disloyal behind makings, base substrate may be short of an edge to take off horn. Bias voltage. Modular head deflective or modular background is inhomogenous. Inattentive. Because feed in raw material measures inadequacy or pressurization frequency inadequacy.
The tall percent defective of the brick of percent defective clay that how reduces argillaceous brick basically is caused. Accordingly, adjust sieve aperture diameter. Burden precision. Base substrate density. Dry time. Combustion temperature. The craft parameter such as heat preservation time can reduce product percent defective. The largest size of raw material screening is adjusted for 2mm for 1.68mm, grain forms close together accumulation to be able to lower hole rate. Use raw material car of burden of pilot of computer of instead of leather belt balance. As a result of composition precision rise, product shrinkage is stable below identical combustion temperature, trash rate is reduced accordingly.
When with attrition the machine that press a brick shapes, blow number increases from 3, base substrate density increases.30g/cm3 to raise 2.35g/cm3 from 2. Can reduce shrinkage, raise n.
In dry time, combustion temperature has very big effect to raising n. Dimension > 400mm dry time is 2, dry time is lengthened for 2d to 6d, firing temperature by 1320 ± 10 ℃ raise 1330 ± 5 ℃ , heat preservation time is lengthened by 32h to 36h. Because the product is dry sufficient, agglomeration is good, product percent of pass can raise 80% above.
What does the drying schedule of brick of different breed clay have to differ, and the account that waste material produces in dry process
The dry system of argillaceous brick should undertake according to different slop composition. The shape that determines different base substrate, dimension and shape method. Argillaceous brick uses half dry process. Because slop is medium clinker content is high, moisture content is low, dry when but fast and dry. When channel oast is dry, temperature of entrance waste gas is 120-160 ℃ , 190-2200 year blast furnace brick and line brick ℃ . Export waste gas temperature: Brick drifting steel and general brick are 30.11 million ℃ , blast furnace brick and line brick 60-900 ℃ .
The go-cart time of channel dry kiln because brick and different. Go-cart interval is 15-30min commonly, total dry time is 375-750min. When dry brick complex base substrate, dry time should longer. Dry hind, the requirement of moisture of base substrate remain is as follows: General clay brick and ≤ of brick of line of bucket flourishing steel 3.0% ; Blast furnace brick and brick drifting steel; ≤ 2. 0 ％ . Water content is big large or base of special shaped brick, should be in air natural and dry period of time, send channel oast next dry.
Because desiccator inlet temperature is exorbitant, after argillaceous brick enters desiccator dry inhomogenous, generation is interstitial. Or because blank weight is great, form is complex, the moisture content inside kiln is high, place blank won't be brought about to be out of shape in desiccator, produce waste material thereby. In addition, in carrying a process, because operate carelessness, the brim takes off horn, even trash rate increases. Accordingly, in dry process, must abide by dry system and operating sequence, place gently, straight, in order to reduce trash.
Foreign matter is high temperature resistant to brick of light qualitative clay functional influence: A few impurity in brick of light qualitative clay have very big negative effect to the high temperature function of brick of light qualitative clay. The breed of the influence of foreign matter composition to function of argillaceous brick high temperature and impurity and amount are concerned. The impurity of different breed has distinct effect to the high temperature function of argillaceous brick, matter content is different also. Foreign matter breed is more, matter content is bigger, bigger to the influence of function of argillaceous brick high temperature. Foreign matter is important and mineral MgO and function of CaO influence high temperature actually to the influence of function of argillaceous brick high temperature. Foreign matter and CaO or MgO a few low melting point are mineral with low melting point mineral fluid photograph produces below high temperature, those who reduced argillaceous brick is high temperature resistant quality. SiO2 of ﹑ of very important Fe2O3 mixes the foreign matter ingredient in argillaceous brick Al2O3. These 3 kinds of important foreign matter are influence of correct function of MgO high temperature not quite, because they affect not big MgO to high temperature function,do not produce low melting point mineral, if MgO and SiO2 line are mirrorred,generate M2S, melting point 1890 ℃ ; Mirror with Al2O3 line generate MA, melting point 2135 ℃ ; MgO can originally a lot of FeO do not have dissolve fluid photograph, yes Fe2O3 also has special. Very strong absorption ability, the content of compound of the iron in argillaceous brick is commonly 1.5% the following. So, very big to the influence of function of MgO high temperature. Very small. Brick of light qualitative clay is weak acidity and fireproof product, can resist acerbity broken bits and acid are eroded angrily, a bit poor to the resistance of basic material. Argillaceous brick hot performance is good. The fireproof sex of argillaceous brick and silica brick comparative, be as high as 1690-1730 ℃ , but load bate temperature is lower than silica brick 20000 ℃ above. Besides crystallization of tall fireproof Mo Laishi, argillaceous brick still contains the low melting point of close half to be not crystal glass photograph.
It is in 0-1000 ℃ inside temperature limits, the bulk of argillaceous brick as temperature lift and expand equably, linear expansion curve is adjacent and linear, linear expansion rate is 0.6%-0. Only the half of silica brick is controlled. Achieve when temperature 12000 when. ℃ continues to rise when temperature when, its bulk will from expand the value begins systole. The leftover systole of argillaceous brick brings about ash of body of build by laying bricks or stones to seam become loose, this is the main drawback of argillaceous brick. When temperature exceeds 1200 after ℃ , the low melting point in argillaceous brick fuses gradually, grain is interdependent below the action of exterior tension, bring about bulk systole.
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