Alumina is hollow knowledge of product of brick of ball heat preservation, comprise structure and manufacturing technology

Alumina is hollow the composition of ball brick and structural Al2O content not under 98% , siO2 content is more than 0.5% , fe2O3 content is more than 0.2% , bulk density is 1.3? 1.48g/cm3, indication porosity is 60% ? 70% , compression intensity is not less than 9.8MPa, loading (0.2MPa) bate temperature must not be less than 1700 ℃ , thermal conductance is 0.7? 0.8W/(m.K) .


Does the sectional structure of hollow ball in hollow ball brick have alumina commonly 3 sort (graph 1): ? ] invade zinc to go up?(a) . Poriferous beehive ball (B) . Large wall is hollow ball (C) . The structural type of hollow ball basically depends on chemical composition, the physical function impact to hollow ball is very big. 18000 basically using alumina is to be used for a long time under ℃ of hollow ball brick. Still have good chemical stability and corrosion resistance below high temperature.
Adiabatic brick by alumina hollow ball is made with alumina hollow ball. Pink of electric frit corundum small pink of.SiO2 of.a-Al203 small pink. Alumina is hollow ball brick is made by silicon line stone and argillaceous pink. Alumina is hollow the ball is a kind of light aggregate, can assure high temperature resistant quality, reduce density; Corundum pink is inert filling; Silicon line stone is a kind of expander, can reduce combustion systole, increase hear resistance; Alumina small pink. Oxidation silicon small pink and argillaceous pink are the adhesive that drops firing temperature. Form appearance of Mo Laishi band. Those who improve fireproof data is high temperature resistant gender and hear resistance. Make up bricky makings according to the burden plan of set, the brick is made after mixing. Shape. After natural and dry 24h, mix via dry 24h of 110 ° C again adiabatic brick of 1600 ° CX4h is fire and become. Quantity of mix into of silicon line stone is 12% when, the property that makes adiabatic brick is: Bulk density 1.48g/cm3. ° CX2h burns C.1600 of ° of compression intensity 26MPa.1710 again the line changes + 0.3% . Heatproof shake sex (water-cooling of 1100 ° C) 17: ?  hires carboxyl alkyne herd to show excel in of Qi carapace? . High temperature resistant. Fight the characteristic of thermal shock.
Hollow ball brick produces alumina in detail the preparation method of hollow ball includes measure alumina grounder burns loss law and law of melt hair drier. Grounder law is to use organic colophony or low fuse-element to make core ball, put into dial coming back, be in next dish in scatter on the wet alumina that contains certain moisture content is pulverous, conglutinate is on core ball, form a crust, resemble lapping outside pill an icing is same. Burn the ball below high temperature next, core ball burns, crust agglomeration forms hollow ball. The defect of this method is efficiency low, spherical not smooth, wall is large control not easily with dimension, because this is in industrial production,did not get applied extensively. The technological process of hollow ball is like preparation alumina the graph is shown 1 times. Use industrial Al2O3 to serve as raw material, direct melt is in electric arc furnace. Electric arc furnace can be used single-phase or three-phase type, with three-phase had better. Body of heater deserves to have tilt device, give makings mouth to deserve to have the aeriform spray pipe of proper point of view. Black lead is used at furnace liner material. Diameter of hypothesis the chamber of a stove or furnace is 550mm, furnace vacates height to be 300mm, 150mm of diameter of black lead electrode, 150mm of electrode round radius, the voltage of fusion is 100V, voltaic 1500~1700A. In fused process, alumina fine pink grade. Clearance is joined, reach sufficient capacity till fuse-element. The temperature of fuse-element is 2200~2300 ℃ about at the same time, can tilt body of heater, make fuse-element from give makings chamfer to pour out of, open baric valve at the same time, capacity is 10m3/min. Pressure is mixed as a result of fuse-element viscosity for 0.6~0.8MPa the action of exterior tension, compress air to be in flight process rapid and caky, form sphere of shape of a hull, collect collect room. Later classics choose. Screening or rinse, rinse frit piece fragment. Be more than 5mm with bead diameter or be less than 0.2mm eliminate big ball and spherule, 5mm presses the eligible and hollow ball that granuality classifications to 0.2mm. The natural accumulation density of hollow ball is alumina 0.42~0.97g/Cm3, serviceability rate is 70%~90% , as ball diameter reduce, the serviceability rate of the ball increases, the nature of the ball accumulates density to also increase. The alumina content of hollow ball is more than 99.5% . This kind of hollow ball can use as directly medicinal powder hot insulation material. When using, can match size ball, those who mix equal amount is light burn α - Al2O3 fine pink, heat preservation effect is better. The high use temperature of hollow ball can amount to alumina 1800 ℃ . If be aggregate with hollow ball, it is with alumina pink base makings, with vitriolic aluminium. Regard the carboxyl of binder as methylic cellulose solution, can make brick of voidance heart ball. Proper collocation is hollow ball size. Alumina fine pink is γ of a kind of industry - AI2O3 classics 1450 ℃ to calcine. Smash. Purify acquisition α - Al2O3, contain Al2O3 quantity to be more than 99% , granuality is less than 0.147mm, be less than 5 μ M to occupy among them 85% the left and right sides. Vitriolic aluminous solution (quality mark is 20%) and carboxyl methylic cellulose solution (quality mark adds bond for 3%) . Irrigate the preform after mixing in wooden model, place go up in shake table, gently vibration shapes, obtain complete sphere. Distributing even base substrate. After body drying, can use 1500~1800 ℃ according to diverse use demand firing below different temperature. The porosity of the product is 50%~70% , compression intensity 4~6MPa, ℃ of · of H of · of thermal conductance 3.3~3.8kJ/m. Cold thermal shock of wind of 1100 ℃ ~ exceeds 15 times circularly, it is a kind of fireproof heat-insulating material, have good heat proof quality. As alumina the affiliation of fine pink is measured and firing the change of temperature, the function of the product produced very big change, the change that size ball compares is not big to the function influence of the product.
Does hollow ball brick have alumina what advantage? Alumina is hollow ball brick is with alumina hollow ball and alumina pink are main raw material, be united in wedlock with other adhesive, become in 1750 ℃ fire. Belong to a kind of of superhigh temperature material energy-saving insulation material. To reduce weight of body of heater, transform a structure. Managing material. Energy-saving effect is distinct. 1. High temperature uses: Thermal stability is good, can amount to 1750 degrees of above. Ratio of the heavy change that burn a line is small, use time is long. 2. Optimize a structure, reduce weight of body of heater: Current, high temperature resistant material belongs to heavy qualitative brick, bulk density is 2.6-3.0g/cm, hollow ball brick has alumina only a.1~1.5g/cm, similar one stere volume, hollow ball brick can reduce use alumina 1.1-1.9 ton weight. 3. Managing material: To reach identical use temperature, if use heavy qualitative brick, its price is equivalent to alumina the price of hollow ball brick, but also need quite big insulation fireproof material. If use alumina hollow ball brick, every stere can save a.1-1. Use 9 tons of heavy qualitative bricks, can save the fireproof insulation material of 80% . 4. Energy-saving: Hollow ball has alumina apparent heat preservation is characteristic, coefficient of thermal conductivity is low, can have very good heat preservation effect, decrease medicinal powder hot, improve thermal efficiency, achieve energy-saving goal thereby. Energy-saving effect can amount to 30% above. Alumina is hollow ball and its goods. Light simple fireproof stuff has exceedingly good energy-saving sex, extraordinary stability is used in all sorts of atmosphere. Especially 1800 ℃ apply at furnace of high temperature kiln. Hollow ball can be used at high temperature. Filling of superhigh temperature heat preservation, high temperature is fireproof concrete pledges gently aggregate, high temperature is pouring makings. Hollow ball brick can be used at high temperature energy-saving (> 30%) pours blaze kiln. Shuttle type kiln. Molybdenum silk furnace. Tungsten marvellous furnace. Inductive furnace. Nitrogen changes furnace to wait. Reduce weight of body of heater, transform a structure. Managing material. Energy-saving effect is distinct. α , alumina pink is with high grade industry alumina is raw material, use kiln of blaze of convert of new-style high temperature and production of craft of scientific to calcine, artificial choice. It is clear to classification. Contain impurity little. Change rate is high. Shrinkage is stable. Consistency is good.