CN1473790A

CN1473790A - High iron brick

Info

Publication number: CN1473790A
Application number: CNA021259968A
Authority: CN
Inventors: 李国�; 李国樑
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-08-08
Filing date: 2002-08-08
Publication date: 2004-02-11

Abstract

The present invention relates to boundary technology of metallurgy and ceramic industry and relates to a product suitable for use in energy saving and environment protecting field. Fe2O3, with high specific heat, low heat conductivity and density 3.96 is used as main material for producing high iron brick as key element for storing heat and cold. Oxide scale as the side product of rolling steel, iron ore powder and clay as adobe forming agent are produced into the high iron brick through baking in strong oxidation atmosphere to convert Fe3O4 into Fe2O3. Lab test shows that high iron brick with Fe2O3 content of 83-90 wt% has great heat and cold storing capacity, so that the high iron brick will be used widely.

Description

High iron brick

The marginal technology of technical field metallurgy and potting.Product is used for the energy-saving and environmental protection field.

Background technology accumulated electric heater technology develop in the existing institute of America and Europe, and its main points are to utilize the electric power of night dip period, by the electrothermal tube heating, thermal energy storage in the energy storage brick, for the use of warming oneself in 24 hours.It is a kind of energy-saving and environmental protection technology.Can use by oneself.Particularly replace coal stove, coal-burning boiler with it, can alleviate the pressure of 2008 Beijing Olympic Games environmental improvement.Behind the sample of obtaining accumulation of energy warmer machine abroad, learn that the principle of the muffle furnace in this equipment and our laboratory is similar.With tubular heating element heating, with the refractory brick accumulation of heat, after ending power supply, need just to discharge complete through more than ten hours heat energy.According to China's data this storage heat of report " core parts " is " heavy metal magneticsubstance brick " (2001.10.29 Beijing Daily).

We press table of density specific heat thermal conductivity row with solid material.Through research relatively, thinking that the energy storage brick is not a metallics, because the specific heat of metals such as copper iron steel tungsten is all lower, also can not be existing industrial silica brick, magnesite chrome brick, high alumina brick.Because not only specific heat is low for they, also because require this class brick high temperature resistant, require its oxide purity height, cost is very expensive.Comprehensively judge from density, specific heat and thermal conductivity, judge that the hot brick of this storage is the high iron brick that contains ferric oxide 85%-90%, by the traditional appellation of China to industrial bricks, be that a kind of after tar dolomite brick, silica brick, magnesite chrome brick, high alumina brick is " high iron brick " of major function with the accumulation of energy, its technical parameter is: iron oxide content is more than 85%, density 3.8-3.9, specific heat 0.938KJ/kg k.Thermal conductivity is 3.4W/MK in the time of 200 ℃.2.54W/MK in the time of 400 ℃.2.1W/MK in the time of 600 ℃.

The high iron brick that with the ferric oxide is major ingredient is the same with metal oxide bricks such as aluminum oxide, magnesium oxide, is insulating material, is not said magneticsubstance in the data report.

Summary of the invention is made high iron brick can three kinds of methods.First method is to use the straight iron powder die mould, sintering in oxidizing atmosphere.But five or six thousand yuan of straight iron powder prices per ton, raw material are too expensive.Second method is with the powdered iron ore, die mould, the sintering that are rich in more than 85%.But grade is in the powdered iron ore mineral resources rareness more than 85%, and also at 400 yuan per ton, cost is too high for price.The third method is preferred plan, and the waste product-iron scale that splits away off during with hot-rolled steel is primary raw material, and it contains Fe ₃O ₄Approach absolutely.But it forms sheet, and is thicker and loose through pulverizing granularity.Add the space for filling, add the low-grade iron ore powder of iron content 30%-40%, and potter's clay (dioxide-containing silica nearly 70%, iron content 2%), its prescription is: iron scale (Fe ₃O ₄) 85%, iron ore powder 10%, potter's clay 5% is converted 5% waterglass, and this prescription one is the Fe that has guaranteed grey iron block ₂O ₃Content is more than 85%, has simultaneously the double adhesive of potter's clay and waterglass to be used for improving the laxity of iron scale, makes to make base and succeed.

Agglomerating temperature in oxidizing atmosphere can not be with 1300 ℃ of high temperature firing aluminium, magnesium, silica brick, and will be with 1000 ℃ (20 ℃+30 ℃).This temperature is the ferric oxide most active temperature line of exchange mutually.Anshan hematite Fe ₂O ₃Because of grade only 30%, can not enter the stove direct ironmaking, again nonmagneticly can not carry out magnetic separation, finally with 1000 ℃ of first atmosphere roasts also, make Fe ₂O ₃Be converted into Fe ₃O ₄And enter magnetic separation process, utilized.Technology that Here it is " the roast magnetic separation of red ore deposit ".Shandong sapphire (Al ₂O ₃Crystalline solid) because including Fe ₃O ₄, be the black opaque state, make Fe in the jewel through 1000 ℃ of oxidizing atmosphere roasts ₃O ₄Be converted into Fe ₂O ₃, then got rid of black, increased transparency.Here it is " sapphire change colour technology ".From above two scientific experiments, sum up, with Fe ₃O ₄For the oxidation and sinter temperature of primary raw material must be 1000 ℃ (20 ℃+30 ℃).If surpass 1060 degree, Fe ₃O ₄To be molten condition, as reach 1300 ℃, Fe ₃O ₄Then fully fusing.

Through practice, with Fe ₃O ₄Be the high iron brick of main material, through 1000 ℃ of five hours sintering, make Fe ₃O ₄Brick is oxidized to Fe ₂O ₃The sintered body brick.All testing in cabinet-type electric furnace and tunnel cave, all is successful.

Use brick on the industrial technology, consist of mainly with metal oxide greatly, but all be strict with the iron content composition, must not surpass 1-2%.And high iron brick makes the content of its ferric oxide up to 85-90%, and the composition that this is special makes high iron brick have the characteristic of energy storage.The per kilogram high iron brick can be preserved heat energy 920 KJ (kilojoule) (closing 220 kilocalories), (0 ℃-980 ℃) or storage cold energy 280 KJ (kilojoule) (closing 66 kilocalories) (20 ℃-negative 273 ℃).Its this accumulation of energy characteristic, the numerous areas such as long-range conveying, oil, chemical industry and boiler manufacturing of will heating at heating, refrigeration, air-conditioning, baking, roast, crude oil are widely used.

The specific embodiment has been sent sample piece and sample to this terraced Bell Co. of Germany and has been chemically examined, detects, and answers to be " very good " and " this brick is good ".Plan is sought to stop production or is not had the refractory brick factory of production task, cooperates, and produces outlet, and this company's size of order of Germany is bigger, requires to order 200,000-600,000 " high iron brick ".

Each solid matter specific heat, thermal conductivity, density comparison sheet

	Specific heat KJ/kg k	Thermal conductivity W/MK	Density		Specific heat KJ/Kgk	Thermal conductivity W/MK	Density
	Specific heat KJ/kg k	Thermal conductivity W/MK	Density		Specific heat KJ/Kgk	Thermal conductivity W/MK	Density	????Fe	????0.49	????54.5	??7.8	?Sio ₂	????0.5	????8	????1.5
????Cu	????0.38	????383.5	??8.9	?A1 ₂O ₃	????0.6	????17	????3.6	????Fe	????0.49	????54.5	??7.8	?Sio ₂	????0.5	????8	????1.5
????Cu	????0.38	????383.5	??8.9	?A1 ₂O ₃	????0.6	????17	????3.6	????Mo	????0.25	????159	??10.22	?BeO	????0.96	????250	????2.9
????W	????0.13	????167	??19.3	?Fe ₂O ₃	????0.938	????2.1	????3.96	????Mo	????0.25	????159	??10.22	?BeO	????0.96	????250	????2.9
????W	????0.13	????167	??19.3	?Fe ₂O ₃	????0.938	????2.1	????3.96	Steel (C1.5%)	????0.49	????50.28	??7.8	?MgO	????0.24	????2.0	????2.2

Claims

" high iron brick " is the new kind of China's industrial technology with brick.

It is characterized in that, require " the iron content composition is very low " opposite, the composition of oxidized metal iron is brought up to more than 85% with other industrial bricks.This high oxidation iron composition make high iron brick not only can tolerate 1000 ℃ high temperature, and itself belongs to the isolator of high resistance.Its most outstanding function is can powerful accumulation of energy, more because its thermal conductivity is low, makes people be convenient to control its energy release rate.With its specific heat 0.938KJ/kgk (KJ (kilojoule)/kilogram-Du) calculate.From 0 ℃-980 ℃, the per kilogram high iron brick can be preserved heat energy 919 KJ (kilojoule) (closing 220 kilocalories) or can preserve cold energy 279 KJ (kilojoule) (closing 66 kilocalories) from 25 ℃ of negative 273 ℃ of per kilogram high iron bricks

The accumulation of energy physical property of " high iron brick " has determined it to be widely used in heating, refrigeration, air-conditioning, baking, roast, the long-range conveying of heating of crude oil, oil, chemical industry and boiler manufacturing, thus save energy and protection environment.

The manufacturing process of " high iron brick " is also different with silicon, magnesium, aluminium brick.It is not by the direct compacting sintering moulding of final oxide compound.But selected Fe in the many oxide of iron ₃O ₄Be main material, under specified temp, be further oxidized to Fe ₂O ₃, this oxidation reaction process has played in fact the effect of sintering for agglumeration.Thereby make the high iron brick structure tight, solid, thereby make this product have long work-ing life.

So request according to the pertinent regulations of state, in the protected time of approval, the patent of invention of " high iron brick " is protected.Not reaching in the situation of cooperation with the inventor, forbid copying.Fe in the brick is defined in suggestion ₂O ₃Content 85% and above person can be called as " high iron brick ".Imitated scope then is set at and contains Fe in the brick ₂O ₃80% and above person, as imitated.When denying request instructions.