CN102992791A - Baking-free refractory brick specially for preheating and cooling sections of lined heat-insulating layer of rotary kiln - Google Patents
Baking-free refractory brick specially for preheating and cooling sections of lined heat-insulating layer of rotary kiln Download PDFInfo
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- CN102992791A CN102992791A CN 201210484439 CN201210484439A CN102992791A CN 102992791 A CN102992791 A CN 102992791A CN 201210484439 CN201210484439 CN 201210484439 CN 201210484439 A CN201210484439 A CN 201210484439A CN 102992791 A CN102992791 A CN 102992791A
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Abstract
The invention relates to a baking-free refractory brick specially for preheating and calcining sections of the lined heat-insulating layer of a rotary kiln and a method for preparing the same. The baking-free refractory brick comprises the following raw materials: bauxite clinker, white corundum, silicon carbide, mullite, drift beads and lightweight ceramisite. The method for preparing the baking-free refractory brick comprises the following steps of: (1) mixing the raw materials with 4% by weigh of aluminum dihydrogen phosphate, adding water to wet, pressing by a pressing machine of 500-650tons, and molding to obtain a blank; and (2) drying the blank obtained in the step (1) for at least 48 hours at 500-550 DEG C to obtain the finished product which is the baking-free refractory brick specially for the preheating and calcining sections of the lined heat-insulating layer of the rotary kiln.
Description
Technical field
The present invention relates to a kind of special-purpose unburned refractory brick be used to building the calcination rotary kiln insulating liner by laying bricks or stones, belongs to fire resisting material field.
Background technology
The inner liner of rotary kiln brick is divided into flame retardant coating and thermal insulation layer, is all built by laying bricks or stones into insulating brick by refractory brick, and refractory brick and insulating brick need to carry out the satin burning and just can make.The satin of alumine refractory brick burns, current general employing pit kiln and two kinds of type of furnaces of shaft furnace; Burn with the pit kiln satin, not only production efficiency is very low, and consumption of coal is very large, and labour intensity is high, and quality product is low, the waste resource, and this is a kind of mode of production that falls behind, and is eliminated gradually.
The workspace of rotary kiln can be divided into three sections, i.e. drying and preheating section, calcining section, cooling section.Such as: the calcination rotary kilns such as cement, refractory materials, oil well fracturing propping agents, lime.The effect of inner liner of rotary kiln brick is to guarantee that three workspace temperature have reliable and stable physicals in the stove in the scope of processing requirement; For example, antistripping, anti-thermal shock, high RUL, wear resisting property.In the prior art, the inner liner of rotary kiln brick is divided into flame retardant coating and thermal insulation layer; The technological deficiency that exists is: brick-building art is complicated, in the use procedure, and flame retardant coating and thermal insulation layer easily break away from, fire-resistant and heat-insulating property is poor, and work-ing life is short, and be 8-10 month actual service life.Cause servicing time long, production cost is high, obviously affects the economic benefit of enterprise.
Summary of the invention
The object of the present invention is to provide a kind of for the preheating of calcination rotary kiln insulating liner, the special-purpose unburned refractory brick of calcining section such as masonry cement, refractory materials, oil well fracturing propping agents, lime, to overcome defective and the deficiency that exists in the prior art.
Technical scheme of the present invention: starting material, specification and the weight part of inner liner of rotary kiln thermal insulation layer of the present invention preheating, the special-purpose unburned refractory brick of calcining section are respectively:
1. bauxite clinker---specification 0.1-1mm---weight part 10-20 part;
2. bauxite clinker---specification 1.1-3mm---weight part 10-25 part;
3. bauxite clinker---specification 3.1-5mm---weight part 10-15 part;
4. bauxite clinker---specification 5.1-8mm---weight part 4-6.5 part;
5. white fused alumina---specification 0.043mm---weight part 5-8 part;
6. silicon carbide---specification 0.075mm---weight part 3-5 part;
7. mullite---specification 0.088mm---weight part 8-10 part;
8. float pearl---density 0.4g/cm
3---specification 0.425-0.633mm---weight part 25-30 part;
9. light ceramic---density 0.6g/cm
3---specification 0.85-1mm---weight part 15-18 part.
The preparation method of inner liner of rotary kiln thermal insulation layer of the present invention preheating, the unburned refractory brick of calcining section is following steps:
Step 1), be described unburned refractory brick starting material that 4% aluminium dihydrogen phosphate mixes, to add water moistening with accounting for total weight parts, through the compacting of 500-650 ton pressing machine, be shaped to blank;
Step 2), step 1) molded blank that obtains, at 500-550 ℃ of environment, keep at least carrying out drying and processing under 48 hours the condition, obtain preheating, the special-purpose unburned refractory brick finished product of calcining section.
The consumption of the selected starting material of the present invention and weight part, specification (specification refers to the granularity of each raw material) grope to sum up to draw through the contriver in a large number, and each component consumption and specification all have comparatively desirable effect in above-mentioned scope.
The function of main raw material:
The bauxitic clay grog
The essential mineral of bauxitic clay grog is diaspore and high alumina silica, and diaspore content increases along with the raising of the ratio of aluminium sesquioxide and silicon-dioxide.Less important mineral are rutile, take off iron ore etc.
White fused alumina
White fused alumina is take the commercial alumina powder as raw material, in electric arc, behind the above high melt of 2000 degree, cool off and make, through pulverizing shaping, the magnetic separation de-iron, be sieved into multiple granularity, its quality is fine and close, hardness is high, particle shape becomes tip-angled shape, be applicable to make pottery, resin bonded grinding tool and grinding, polishing, sandblast, precision casting (the special-purpose corundum of smart casting) etc., also can be used for making high grade refractory, code name " WA " is consistent in general international standard, national standard, and majority also has a certain amount of supply demestic user for export.General grain size number is F4-F220, and its Chemical Composition is looked globule size and difference.Outstanding characteristics are that crystalline size is little shock-resistant, if broken with autogenous mill processing, particle mostly is spherical particle, and surface dry is clean, is easy to the wedding agent combination.
Silicon carbide (SiC)
Si is unique binary compound in the Si-C binary prime system, and its atomic ratio is 1: 1, contains C29.7%, and Si is 70.3%.SiC has several product types: β-SiC and α-SiC.β-SiC is isometric system, irreversibly slowly is converted into isometric system α-SiC since 2100 ℃ to 2400 ℃, and β-SiC true density is 3.21g/cm
3, α-SiC is 3.22g/cm
3With α-SiC, it has very low thermal expansivity in high-strength antistripping wear-resistant paint, but thermal conductivity is very high.At room temperature be about 35w/m ℃.SiC does not melt, when temperature is higher than 2760 ℃, begin to be decomposed into steam and O2 in fact SiC since 2200 ℃～2500 ℃, decompose, to significantly decomposing more than 2700 ℃.
The chemical stability of SiC is better, at Hcl H
2SO
4Do not weather with boiling among the HF yet.Chemical reaction does not at high temperature occur with silicic acid in SiC yet, thus have the superperformance that the opposing acid slag corrodes, but all be subject to the erosion of basic slag.SiC and carbon begin to be reacted to about 1000 ℃ reaction significantly in the time of 525 ℃.It and mgo reaction is significantly carried out at 800 ℃ strongly with the reaction of cupric oxide under this temperature.The appearance of obviously as seen bursting apart when being reacted to 1300 ℃ with ferric oxide 1000 ℃-1200 ℃ the time.Occur the phenomenon of bursting apart with manganese oxide from 1360 ℃, SiC reacts with it since 600 ℃ in chlorine, can make it be decomposed into SiCl4 and CCl4 during to 1200 ℃, molten caustic soda can make SiC decompose under red heat temperature, so can not resist borax, sodium aluminum fluoride, water glass, the erosion of salt of wormwood etc.The point molten metal of oxide-free corrodes SiC at 1000 ℃-1200 ℃, but zinc and plumbous exception, so zinc distillation furnace and lead-smelting furnace are best with the SiC result of use with coating.
Because it is very high that SiC is difficult for fusing and decomposites the temperature of steam, and have very high thermal conductivity and low thermal expansivity, thereby have good resistance to heat shocks.In addition, the performance that SiC chemical resistance of concrete and acid slag corrode is very strong, so can think a kind of good refractory materials, occupies an important position in this present invention.
Float pearl: the main chemical compositions of floating pearl is the oxide compound of silicon, aluminium, and wherein silicon-dioxide is about 50-65%, and aluminium sesquioxide is about 25-35%.Because silicon-dioxide is molten up to 1725 degree Celsius, the molten point of aluminium sesquioxide is 2050 degree Celsius, is high refractory substance.Therefore, float pearl and have high refractoriness, generally reach 1600-1700 degree Celsius, make it become excellent high-performance refractory material.Light weight, heat insulating.Floating the thin hollow of pearl wall, is the partial vacuum in the cavity, only has the gas (N2, H2 and CO2 etc.) of denier, and thermal conduction is atomic extremely slowly.So float pearl not only light weight (unit weight 250-450 kilogram/m3), and heat insulating excellent (thermal conductivity normal temperature 0.08-0.1), this exhibits one's skill to the full in the light heat insulating material field for it and lays a good foundation.Hardness is large, intensity is high.Be the stiff glass body that forms with sieve and silica-sesquioxide mineral facies (quartz and mullite) owing to float pearl, hardness can reach Mohs 6-7 level, and isostatic pressing strength is up to 70-140MPa, true density 2.10-2.20 gram/cm3, and rock is suitable.Therefore, float pearl and have very high intensity.The granularity of floating the pearl self-assembling formation is the 1-250 micron.Specific surface area 300-360cm2/g, and cement is similar.Therefore, floating pearl does not need grinding, can directly use.Fineness can satisfy the needs of various goods.
Light ceramic: because haydite has lightweight, so also be referred to as light ceramic or Lightweight ceramic granule.Light ceramic employing clay or flyash, biological sludge are main raw material, by high-temperature roasting, expanded forming, light ceramic is as a kind of light-weight aggregate, has that density is little, intensity is high, water-intake rate is large, characteristics such as insulation, heat insulation, fire-resistant, antidetonation, and is of many uses, can replace common sandstone preparation light aggregate concrete, as water treatment filter material, sorbent material, porous pavement material, can also be as the substratum of soilless culture in agricultural, the gardens, and the building materials raw materials such as decking, holllow building block.The outward appearance of light ceramic is rounded.Its surface is the hard shell of one deck, and this layer shell is ceramic or enamel, has water proof and protects the gas effect, and give the higher intensity of haydite and absorption ability.Haydite is divided into general density haydite, ultra-low-density haydite, special light density haydite three classes by density.General density haydite refers to that density is greater than the haydite of 500kg/m3.Its intensity is generally relatively high, and is multiplex in structural thermal insulation concrete or high-strength concrete.The ultra-low-density haydite generally refers to the haydite of 300～500kg/m3.This haydite generally is used for thermal-insulating concrete and goods thereof.Special light density haydite refers to the haydite less than 300kg/m3.Its thermal and insulating performance is very excellent, but intensity is relatively poor.Generally for the production of the light thermal-insulating concrete of spy and goods thereof.
Mullite
Mullite is a kind of refractory materials of high-quality, it has the characteristics such as expansion is even, thermal shock resistance is fabulous, load softening point is high, the high temperature creep value is little, hardness is large, resistance to chemical corrosion is good, mainly contain at present high-purity fused mullite, common electrofused mullite, All Pure Nature bauxitic clay concentrate fused mullite and light-burned mullite, all can be used as starting material of the present invention.
Aluminum phosphate solution and preparation method: first the diluting water that weighs up is in advance put into acid-resistant container, then slowly pour the phosphoric acid of weighing in advance into, with not stirring with the stirring rod of acid-respons, phosphoric acid and water are mixed, add immediately aluminium hydroxide in batches, stir while adding, until aluminium hydroxide dissolves fully, can use the aluminum phosphate solution mol ratio for preparing to be＞2.2-3.0 after the cooling; Moisture content is less than 60%.
Concrete use-case: the sincere prosperous Refractory Co., ltd in Dengfeng City, Henan Province, utilize inner liner of rotary kiln thermal insulation layer of the present invention preheating, the special-purpose unburned refractory brick of calcining section, build the refractory material aggregate sintering rotary kiln by laying bricks or stones; Be 18-20 month mean life, is 1-2 times of like product.
Record concrete physical and chemical index such as following table:
| Refractoriness ℃ | 1580 |
| Volume density g/cm 3 | 1.6—1.8 |
| Cold crushing strength MPa | 15 |
| Thermal conductivity (350 ℃ ± 25 ℃) W/mK | ≤0.6 |
Above numeral shows that all concrete physical and chemical indexs all are better than other like product.
Embodiment
Specific embodiment
Starting material, specification and the weight part of inner liner of rotary kiln thermal insulation layer of the present invention preheating, the special-purpose unburned refractory brick of calcining section are respectively:
1. bauxite clinker---specification 0.1-1mm---weight part 10-20 part;
2. bauxite clinker---specification 1.1-3mm---weight part 10-25 part;
3. bauxite clinker---specification 3.1-5mm---weight part 10-15 part;
4. bauxite clinker---specification 5.1-8mm---weight part is 4-6.5 parts;
5. white fused alumina---specification 0.043mm---weight part is 5-8 parts;
6. silicon carbide---specification 0.075mm---weight part is 3-5 parts;
7. mullite---specification 0.088mm---weight part 8-10 part;
8. float pearl---density 0.4g/cm
325-30 parts of---specification 0.425-0.633mm---weight parts;
9. light ceramic---density 0.6g/cm
3---specification 0.85-1mm---weight part 15-18 part.
The preparation method of inner liner of rotary kiln thermal insulation layer of the present invention preheating, the special-purpose unburned refractory brick of calcining section is following steps:
Step 1), be described unburned refractory brick starting material that 4% aluminium dihydrogen phosphate mixes, to add water moistening with accounting for total weight parts, through the compacting of 500-650 ton pressing machine, be shaped to blank;
Step 2), step 1) molded blank that obtains, at 500-550 ℃ of environment, keep at least carrying out drying and processing under 48 hours the condition, obtain preheating, the special-purpose unburned refractory brick finished product of calcining section.
Claims (2)
1. inner liner of rotary kiln thermal insulation layer preheating, the special-purpose unburned refractory brick of calcining section is characterized in that starting material, specification and the weight part of the unburned refractory brick of described inner liner of rotary kiln thermal insulation layer are respectively:
1. bauxite clinker---specification 0.1-1mm---weight part 10-20 part;
2. bauxite clinker---specification 1.1-3mm---weight part 10-25 part;
3. bauxite clinker---specification 3.1-5mm---weight part 10-15 part;
4. bauxite clinker---specification 5.1-8mm---weight part 4-6.5 part;
5. white fused alumina---specification 0.043mm---weight part 5-8 part;
6. silicon carbide---specification 0.075mm---weight part 3-5 part;
7. mullite---specification 0.088mm---weight part 8-10 part;
8. float pearl---density 0.4g/cm
3---specification 0.425-0.633mm---weight part 25-30 part;
9. light ceramic---density 0.6g/cm
3---specification 0.85-1mm---weight part 15-18 part.
2. according to inner liner of rotary kiln thermal insulation layer claimed in claim 1 preheating, the special-purpose unburned refractory brick of calcining section, it is characterized in that the preparation method is following steps:
Step 1), be described unburned refractory brick starting material that 4% aluminium dihydrogen phosphate mixes, to add water moistening with accounting for total weight parts, through the compacting of 500-650 ton pressing machine, be shaped to blank;
Step 2), step 1) molded blank that obtains, at 500-550 ℃ of environment, keep at least carrying out drying and processing under 48 hours the condition, obtain preheating, the special-purpose unburned refractory brick finished product of calcining section.
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| Application Number | Priority Date | Filing Date | Title |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210484439 CN102992791A (en) | 2012-11-13 | 2012-11-13 | Baking-free refractory brick specially for preheating and cooling sections of lined heat-insulating layer of rotary kiln |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150919A (en) * | 2014-07-21 | 2014-11-19 | 吴雯雯 | Refractory aggregate of long-life blast-furnace tapping sand hole |
| CN108715555A (en) * | 2018-07-05 | 2018-10-30 | 郑州振东科技有限公司 | A kind of permanent layer light fire brick and preparation method thereof |
| CN114874018A (en) * | 2022-06-15 | 2022-08-09 | 平玉英 | Heat-insulating energy-saving high-temperature refractory material for industrial kiln and preparation method thereof |
-
2012
- 2012-11-13 CN CN 201210484439 patent/CN102992791A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150919A (en) * | 2014-07-21 | 2014-11-19 | 吴雯雯 | Refractory aggregate of long-life blast-furnace tapping sand hole |
| CN104150919B (en) * | 2014-07-21 | 2018-10-16 | 吴雯雯 | A kind of blast furnace casting of longevity sand mouth refractory aggregate |
| CN108715555A (en) * | 2018-07-05 | 2018-10-30 | 郑州振东科技有限公司 | A kind of permanent layer light fire brick and preparation method thereof |
| CN114874018A (en) * | 2022-06-15 | 2022-08-09 | 平玉英 | Heat-insulating energy-saving high-temperature refractory material for industrial kiln and preparation method thereof |
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Application publication date: 20130327 |