One, the manufacturing technology of fire magnesium chromic brick and general similar. Be in to eliminate a brick firing the expand and causes inattentive effect when the as a result of MgO and CrO, AlO or iron oxide reaction in the process generates pointed spar, also can use compound collective agglomeration makings makes magnesian chromic brick. In addition, still have do not burn magnesian chromic brick, for example, do not burn magnesian chromic brick with what solution of inorganic magnesium salt is united in wedlock.
2, do not burn magnesian chromic brick to manufacture technology simple, cost is low, thermal stability it may not be a bad idea, but high temperature intensity is far not as good as firing brick. 50 time end, development goes a kind of alleged “ to combine ” magnesium chromic brick directly. The characteristic of this kind of brick is raw material pure, firing temperature is high, the high temperature such as square magnesian stone, pointed spar is united in wedlock directly between the photograph, the low frit photograph such as silicate distributings for Gu island shape, accordingly, the high temperature strength that increased a brick significantly and the sex that fight broken bits.
3, the mine that use chromium - the fine noodles or vermicelli made from bean or sweet potato starch that after magnesia grinds the to calcine that control base in all, makes, with magnesia thick grain cooperates to formulate bricky method, it is the significant step that removes inattentive effect the magnesian chromium brick that becomes with this kind of honest legal system, with common magnesium chromic brick photograph is compared, bricky porosity is low, temperature of bate of compression intensity, loading and fight lose strength all taller. The mine that use chromium - magnesite pink controls base, the synthetic magnesian chromium of to calcine of classics high temperature is arenaceous the magnesian chromic brick that makes,
Magnesian content is in the 90% above, alkalescent and fireproof material that gives priority to brilliant photograph with square magnesian stone.
1, can divide commonly for agglomeration magnesia brick (say again firing magnesia brick) combine magnesia brick with chemistry (say not to burn magnesia brick again) two kinds big. Purity and firing the magnesia brick with high temperature, because grain of square magnesian stone is contacted directly, the brick that calls; of direct union magnesia brick to be made for raw material with electric frit magnesia calls magnesia brick of electric frit recombine.
2, magnesia brick has taller fireproof degree, function of very good broken bits of alkali resistance sex, loading bate begins temperature tall, but heatproof shake performance is poor. Agglomeration magnesia brick is raw material with making bricky magnesia brick, via smashing, burden, mix practice, after shaping, in 1550 ～ the high temperature of 1600 ℃ falls firing, high pure of goods firing temperature is in 1750 ℃ above. Irrigating magnesia brick is proper chemical bond is added in magnesia, via mixing refine, shape, dry and make.
3, basically use at steel-making hearth of alkalescent open-hearth furnace, electric stove and boiler setting, the permanent line of aerobic converter, nonferrous metal smelting furnace, kiln of high temperature channel, to calcine magnesia brick and liner of cement rotary kiln, the hearth of heating furnace and boiler setting, checker brick of vitreous kiln regenerator!
4, can divide commonly for agglomeration magnesia brick (say again firing magnesia brick) combine magnesia brick with chemistry (say not to burn magnesia brick again) two kinds big. Purity and firing the magnesia brick with high temperature, because grain of square magnesian stone is contacted directly, call direct union magnesia brick; The brick that makes for raw material with electric frit magnesia calls magnesia brick of electric frit recombine.
Magnesia brick has taller fireproof degree, function of very good broken bits of alkali resistance sex, loading bate begins temperature tall, but heatproof shake performance is poor. Agglomeration magnesia brick is raw material with making bricky magnesia brick, via smashing, burden, mix practice, after shaping, in 1550 ～ the high temperature of 1600 ℃ falls firing, high pure of goods firing temperature is in 1750 ℃ above. Irrigating magnesia brick is proper chemical bond is added in magnesia, via mixing refine, shape, dry and make.
The manufacturing technology of fire magnesium chromic brick and similar of cardinal principle of magnesian qualitative brick. Be in to eliminate a brick firing mix as a result of MgO in the process Cr2O3, Al2O3 or chromic brick of direct union magnesium
The oxide reaction of iron creates the expand and causes inattentive effect when pointed spar, also can use compound collective agglomeration makings makes magnesian chromic brick. In addition, still have do not burn magnesian chromic brick, for example, do not burn magnesian chromic brick with what solution of inorganic magnesium salt is united in wedlock. Do not burn magnesian chromic brick to manufacture technology simple, cost is low, thermal stability it may not be a bad idea, but high temperature intensity is far not as good as firing brick. 50 time end, development goes a kind of alleged “ to combine ” magnesium chromic brick directly. The characteristic of this kind of brick is raw material pure, firing temperature is high, the high temperature such as square magnesian stone, pointed spar is united in wedlock directly between the photograph, the low frit photograph such as silicate distributings for Gu island shape, accordingly, the high temperature strength that increased a brick significantly and the sex that fight broken bits.
The mine that use chromium - the fine noodles or vermicelli made from bean or sweet potato starch that after magnesia grinds the to calcine that control base in all, makes, with magnesia thick grain cooperates to formulate bricky method, it is the significant step that removes inattentive effect. The magnesian chromic brick that with this kind honest legal system becomes, with common magnesium chromic brick photograph is compared, bricky porosity is low, temperature of bate of compression intensity, loading and fight lose strength all taller. The mine that use chromium - magnesite pink controls base, the synthetic magnesian chromium of to calcine of classics high temperature is arenaceous the magnesian chromic brick that makes,
In addition, magnesian chromium of melt of furnace of Gu of useful still report expects direct casting and gotten founding magnesium is chromic brick, the frit bead recombine that with electric frit magnesium chromic makings presses the craft that make a brick to produce is magnesian chromic brick.
Magnesia brick makes common magnesia brick again, mgO content is in 80%-85% above, it is to use natural magnesite to get via high temperature to calcine firing magnesian stone (magnesia) for main raw material, add additive and bond, classics burden, mix refine, shape, dry hind firing below high temperature or electric frit and into, common magnesia brick has agglomeration magnesia brick and electric frit magnesia brick.
One, magnesia brick is characteristic
1, counteractive and basic slaggy ability is strong.
2, fireproof degree tall, high temperature capability is good.
3, loading bate begins temperature tall.
4, heat conduction function lifts as temperature reduce, conversely temperature is lower heat conduction is taller.
Note: The use of magnesia brick character because of raw material, craft that make different have bigger distinction.
2, magnesia brick utility
Basically use at layer of surface of hearth of boiler setting of steel-making electric stove and hearth, the furnace that mix iron, heating furnace and bottom of soaking furnace boiler setting, alkalescent open-hearth furnace, converter is permanent line, also can use at furnace of nonferrous metal metallurgy and fireproof material high temperature firing kiln and to calcine kiln.
3, of magnesia brick fireproof degree can amount to 2000 ℃ above, the melting point that temperature of its loading bate follows cementation appearance and the amount that its issue the fluid photograph of a generation in high temperature differ and have bigger difference. The loading bate of general magnesia brick begins temperature to be between 1520~1600 ℃ , and high pure magnesia brick can amount to 1800 ℃ . The loading bate of magnesia brick begins temperature and collapse temperature differs not quite. The linear expansion rate of the magnesia brick below 20~1000 ℃ is 1.2%~1.4% commonly, show linear approximately. When fluid photograph appearing inside the brick below high temperature, can produce systole suddenly. The thermal conductance of magnesia brick is taller, carbolic brick and carbonization silica brick are next to in refractory products, what it follows temperature is elevatory and reduce. The heatproof shake sex of magnesia brick is poorer, the purity that raises magnesia brick can raise heatproof shake sex appropriately. The ability that magnesia brick fights acid slag is very poor, when using, cannot contact with silica brick directly, want to use neuter brick to separate its commonly. The conductivity that magnesia brick issues in normal temperature is very low, but in high temperature (like 1500 ℃ ) fall to cannot be ignored however, if be used at electric stove hearth, should bring to sb's attention.
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