CN102992790A - Baking-free refractory brick specially for calcining section of lined heat-insulating layer of rotary kiln - Google Patents
Baking-free refractory brick specially for calcining section of lined heat-insulating layer of rotary kiln Download PDFInfo
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- CN102992790A CN102992790A CN 201210484438 CN201210484438A CN102992790A CN 102992790 A CN102992790 A CN 102992790A CN 201210484438 CN201210484438 CN 201210484438 CN 201210484438 A CN201210484438 A CN 201210484438A CN 102992790 A CN102992790 A CN 102992790A
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- refractory brick
- bauxite clinker
- rotary kiln
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- baking
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Abstract
The invention relates to a baking-free refractory brick specially for the calcining section 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 1, bauxite clinker 2, bauxite clinker 3, bauxite clinker 4, white corundum 5, silicon carbide 6 and mullite 7, wherein the bauxite clinker 1, the bauxite clinker 2, the bauxite clinker 3 and the bauxite clinker 4 have different specifications. 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 calcining section 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 calcination rotary kiln air retaining wall calcining section 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 special-purpose unburned refractory brick of calcination rotary kiln air retaining wall 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 the special-purpose unburned refractory brick of inner liner of rotary kiln layer calcining section of the present invention 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;
The preparation method of the special-purpose unburned refractory brick of inner liner of rotary kiln layer calcining section of the present invention 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 special-purpose unburned refractory brick finished product.
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.Sometimes also contain a small amount of Baume stone and dickite.
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.
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.
The preparation method of aluminum phosphate solution:
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 utilizes the special-purpose unburned refractory brick of inner liner of rotary kiln layer calcining section of the present invention, builds 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 ℃ | 1790 |
| Volume density g/cm 3 | 2.75 |
| Cold crushing strength MPa | 70 |
| 0.2MPa loading softening begins temperature ℃ | 1480 |
Above numeral shows that all concrete physical and chemical indexs all are better than other like product.
Embodiment
The special-purpose unburned refractory brick starting material of described inner liner of rotary kiln layer calcining section, specification and weight part 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.
The preparation method of the special-purpose unburned refractory brick of inner liner of rotary kiln layer calcining section of the present invention 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 special-purpose unburned refractory brick finished product.
Claims (2)
1. the special-purpose unburned refractory brick of inner liner of rotary kiln layer 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 layer special use 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.
2. according to the special-purpose unburned refractory brick of inner liner of rotary kiln layer calcining section claimed in claim 1, 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 the special-purpose unburned refractory brick finished product of calcining section.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210484438 CN102992790A (en) | 2012-11-13 | 2012-11-13 | Baking-free refractory brick specially for calcining section of lined heat-insulating layer of rotary kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210484438 CN102992790A (en) | 2012-11-13 | 2012-11-13 | Baking-free refractory brick specially for calcining section of lined heat-insulating layer of rotary kiln |
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| CN102992790A true CN102992790A (en) | 2013-03-27 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106045540A (en) * | 2016-07-19 | 2016-10-26 | 郑州鑫源防磨耐材有限公司 | High-strength wearing-resistant refractory casting material |
| CN106631058A (en) * | 2016-11-28 | 2017-05-10 | 浙江锦诚新材料股份有限公司 | Phosphate wear-resistant paint and spraying method thereof |
| CN111302819A (en) * | 2020-04-22 | 2020-06-19 | 河南省宏达炉业有限公司 | Firebrick for combustion chamber of belt sintering machine and preparation method thereof |
| CN116023155A (en) * | 2022-12-16 | 2023-04-28 | 巩义通达中原耐火技术有限公司 | Alumina-based homogeneous mullite unburned brick for lime rotary kiln and preparation method thereof |
-
2012
- 2012-11-13 CN CN 201210484438 patent/CN102992790A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106045540A (en) * | 2016-07-19 | 2016-10-26 | 郑州鑫源防磨耐材有限公司 | High-strength wearing-resistant refractory casting material |
| CN106631058A (en) * | 2016-11-28 | 2017-05-10 | 浙江锦诚新材料股份有限公司 | Phosphate wear-resistant paint and spraying method thereof |
| CN111302819A (en) * | 2020-04-22 | 2020-06-19 | 河南省宏达炉业有限公司 | Firebrick for combustion chamber of belt sintering machine and preparation method thereof |
| CN116023155A (en) * | 2022-12-16 | 2023-04-28 | 巩义通达中原耐火技术有限公司 | Alumina-based homogeneous mullite unburned brick for lime rotary kiln and preparation method thereof |
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Application publication date: 20130327 |