CN103833396B - High-strength high-alumina brick prepared from homogenized alumina for calcium carbide furnace and preparation method thereof - Google Patents
High-strength high-alumina brick prepared from homogenized alumina for calcium carbide furnace and preparation method thereof Download PDFInfo
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- CN103833396B CN103833396B CN201410062146.9A CN201410062146A CN103833396B CN 103833396 B CN103833396 B CN 103833396B CN 201410062146 A CN201410062146 A CN 201410062146A CN 103833396 B CN103833396 B CN 103833396B
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Abstract
The invention discloses a high-strength high-alumina brick prepared from homogenized alumina for a calcium carbide furnace. The high-strength high-alumina brick comprises the following components in percentage by weight: 5%-15% of 5-3mm 88-grade homogenized alumina, 25%-40% of 3-1mm 88 homogenized alumina, 12%-16% of 1-0mm 88-grade homogenized alumina, 5%-15% of 320-mesh 99-grade tabular corundum, 12%-25% of 220-mesh 80-grade ring kiln alumina, 2%-5% of 220-mesh hard clay, 2%-4% of 320-mesh kyanite and 3%-8% of Soochow white mud, wherein the sum of the weight percentage of the components is 100%; and the sum of the weight percentage of the components is used as a benchmark, 0.3%-0.6% of yellow dextrin, 0.15%-0.25% of surface active agent and 2%-3% of water are additionally added, wherein the surface active agent is a mixture of a sulfonated naphthol formaldehyde polymer and polycarboxylic acid, the weight ratio of which is 1:1.
Description
Technical field
The invention belongs to technical field of refractory materials, be specifically related to a kind of furnace of calcium carbide high-strength high-alumina brick adopting homogenizing alumina to prepare and preparation method thereof.
Background technology
Calcium carbide is important basic chemical industry product, in recent years along with the constantly soaring of international oil price and the continuous rise of oil deep processed product cost, generated by polyvinyl chloride by calcium carbide and other calcium carbide downstream industry have and develop faster, calcium carbide demand and production capacity also increase day by day, impel the furnace of calcium carbide equipment technology level of China's calcium carbide industry to there has also been very large raising.In furnace of calcium carbide, converting electric energy becomes heat energy, and make the calcium in the carbon of carbon raw and unslaked lime that complicated physicochemical change occur and synthesize calcium carbide, furnace of calcium carbide is of great significance the safety in production and good quality and high output tool that ensure calcium carbide.
The high temperature sent due to electric arc in furnace of calcium carbide is more than 2000 DEG C, and general refractory materials is all difficult to bear high-temperature so.At large-scale furnace of calcium carbide, in burner hearth, refractory brick all adopts high-alumina refractory brick to build by laying bricks or stones from top to bottom, and the middle and upper part of the inherent burner hearth of small calcium carbide furnace due to temperature lower, have employed refractoriness and refractoriness under load is lower, wear resistance better and the cheaper schamotte brick of price build by laying bricks or stones, burner hearth middle and lower part furnace temperature is high, washing away also along with high-temperature furnace gas and liquid calcium carbide, must adopt refractoriness and refractoriness under load is higher, void content is low, slag resistance is good high-alumina refractory brick is built by laying bricks or stones.Along with environmental protection and energy-conservation demand, furnace of calcium carbide is to high-power closed future development, and the Working environment of furnace lining becomes harsher.Although melting pool position is covered with self-baked charcoal brick in furnace of calcium carbide, self-baked charcoal brick for raw material, adds tar and pitch is that compressed with adhesive is shaping with hard coal and high carbon coke fine powder, and the charcoal element form in brick is unformed.Together with bricklaying surface when building by laying bricks or stones between brick with brick is brushed, finedraw is stuck with paste, then jam-packed puzzle joint.Electric heating roasting during blow-on in baker and production process, volatile matter is wherein removed, and when temperature reaches more than 2000 DEG C, unformed charcoal gradates as graphite crystal, and brickwork joint is close to and disappears, whole furnace bottom integration.But in actual procedure, because baker phase temperature generally can not reach more than 2000 DEG C, the charcoal element greying that low temperature charcoal element smashes material and self-baked charcoal brick is very insufficient, and the gap between brick fuel still exists, and makes the havoc of brick fuel layer when blow-on power transmission under high temperature.Especially in order to enhance productivity and strengthen production capacity, when employing is more than 2000 DEG C of temperature meltings, high alumina brick lining temperature is still very high, require that high alumina brick must have higher intensity, soft, the better erosion-resisting characteristics of higher lotus, and the high alumina brick reaching national regulations performance index is still difficult to bear high temperature like this and bad working environments.
Summary of the invention
Technical problem to be solved by this invention, is to provide a kind of furnace of calcium carbide high-strength high-alumina brick adopting homogenizing alumina to prepare.
The technical problem that the present invention also will solve is to provide the preparation method of above-mentioned furnace of calcium carbide high-strength high-alumina brick.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
The furnace of calcium carbide high-strength high-alumina brick adopting homogenizing alumina to prepare, it comprises the component of following weight percent:
With the weight sum of said components for benchmark, additional:
Yellow starch gum 0.3% ~ 0.6%;
Tensio-active agent 0.15% ~ 0.25%;
Water 2% ~ 3%;
Wherein, described tensio-active agent is that (sulfonated naphthol yuban is the polymkeric substance that the sulfonated naphthol formaldehyde (NPF) being Material synthesis with naphthols, the vitriol oil and formaldehyde is formed through condensation reaction to sulfonated naphthol yuban, the same with poly carboxylic acid, be the novel water reducer of excellent property, known the technician in concrete field and water reducer field) with the mixture of poly carboxylic acid by weight 1:1.
Raw material in above-mentioned formula is commercially available material, can be bought directly from the market.
Prepare the method for furnace of calcium carbide high-strength high-alumina brick prepared by above-mentioned employing homogenizing alumina, the method comprises the steps:
(1) be pre-mixed fine powder: take 320 object 99 plate diamond spars, 220 object 80 rotary kiln alumina, 220 object flint claies, 320 object kyanites and Suzhou white clay by formula ratio, add together in powder stirrer and stir 10 ~ 20 minutes, for subsequent use after discharging;
(2) aggregate mixing: take 88 homogenizing alumina 5 ~ 3 ㎜ by formula ratio, after 3 ~ 1 ㎜ add and be dry mixed in powder stirrer together with 1 ~ 0 ㎜, add yellow starch gum and tensio-active agent again, mix after 3 ~ 5 minutes, add water stirring, make material surface wettability, mix after 5 ~ 10 minutes, the mixing fine powders that step (1) obtains is added wherein, continue stirring 10 ~ 20 minutes;
(3) shaping: material that step (2) is obtained adopt friction press or hydropress shaping;
(4) dry: material step (3) obtained is at 80 ~ 160 DEG C of dry kiln inside holding 24 ~ 48h;
(5) burn till: step (4) dried base substrate is burnt till in 1450 DEG C ~ 1470 DEG C insulation 3 ~ 5h, to obtain final product.
Beneficial effect: advantage of the present invention is:
(1) adopt the tap density of rational Pyatyi grain composition material particle high, and electrostatic repulsion when utilizing tensio-active agent to reduce shaping, and decrease mixing of moisture, make that the shaping density of material is high, apparent porosity is low, erosion-resisting characteristics is better.High alumina brick apparent porosity≤15% after burning till, significantly lower than GB LZ-80 high alumina brick (≤22%) and LZ-75 high alumina brick (≤23%).
(2) the material homogenizer alumina owing to adopting has that ore deposit is mutually homogeneous, stable components, performance are controlled, high alumina brick principal crystalline phase after burning is the mullite phase and corundum phase that high-temperature behavior is excellent, makes high alumina brick of the present invention have higher intensity, higher lotus softening temperature and better scour resistance.Table 1 lists the performance comparison data of high-strength high-alumina brick of the present invention and GB two kinds of trade mark blast furnace bricks (LZ-80 and LZ-75).
(3) introducing fine and close flint clay and Suzhou white clay can acceleration of sintering, reduces production cost;
(4) adopt the homogenizing alumina of stable performance and mix kyanite and make the reheat linear change of high alumina brick low, ensure that the dimensional precision of high alumina brick, being suitable for the furnace of calcium carbide furnace lining that employing dry method is built by laying bricks or stones.
(5) mix tensio-active agent (sulfonated naphthol yuban and poly carboxylic acid 1:1 ratio mixing), reduce the required pressure that is shaped, by electrically charged for the few particle institute repulsion when punching press, improve formability, reduce apparent porosity, raising compactness.
Table 1 furnace of calcium carbide high-strength high-alumina of the present invention brick and GB LZ-80 high alumina brick and LZ-75 high alumina brick performance comparison
Embodiment
According to following embodiment, the present invention may be better understood.But those skilled in the art will readily understand, the content described by embodiment only for illustration of the present invention, and should can not limit the present invention described in detail in claims yet.
Embodiment 1:
Furnace of calcium carbide high-strength high-alumina brick formula (weight percentage) adopting homogenizing alumina to prepare is as follows:
The 88 homogenizing alumina of 5 ~ 3 ㎜, 6%
The 88 homogenizing alumina of 3 ~ 1 ㎜, 26%
The 88 homogenizing alumina of 1 ~ 0 ㎜, 16%
320 object 99 plate diamond spars, 15%
220 object 80 rotary kiln alumina, 25%
The fine and close flint clay of 220 objects, 5%
320 object kyanites, 4%
Suzhou white clay, 3%
Additional:
Yellow starch gum, 0.4%
Tensio-active agent (sulfonated naphthol yuban and poly carboxylic acid are by weight the mixture of 1:1), 0.15%
Water, 3%.
Specific embodiment comprises following a few part:
(1) fine powder is pre-mixed.Weigh by proportion speed; 320 order 99 plate diamond spars, 220 order 80 rotary kiln alumina, 220 orders fine and close flint clay, 320 order kyanites, Suzhou white clay, add together in powder stirrer and be stirred to 12 minutes, for subsequent use after discharging.
(2) aggregate mixing.Weigh by proportion speed; After 88 homogenizing alumina 5 ~ 3 ㎜, 3 ~ 1 ㎜, 1 ~ 0 ㎜ add together and are dry mixed in machine, add yellow starch gum, tensio-active agent, mix after 3 minutes, then add clear water and stir, make its surface wettability, mix 9 minutes, then will be pre-mixed fine powder, and weigh by proportion speed; Add in stirrer and stir 20 minutes.
(3) be shaped.Employing friction press is shaped.
(4) dry.Be 80 DEG C of dry kiln inside holding 48h in temperature.
(5) burn till.Dried base substrate is burnt till in 1470 DEG C of insulation 3h.
Embodiment 1(embodiment 2, embodiment 3) performance index list in table 2, test result shows that the performance index such as the apparent porosity of furnace of calcium carbide high-strength high-alumina brick of the present invention, intensity, high temperature lotus be soft are better than GB two kinds of trade mark blast furnace bricks (LZ-80 and LZ-75) all significantly.Principal crystalline phase is the mullite phase and corundum phase that high-temperature behavior is excellent, and antiscour, anti-calcium carbide sling liquid erosion performance are good.Reheat linear change is low, ensure that the dimensional precision of high alumina brick, is suitable for the furnace of calcium carbide furnace lining adopting dry method to build by laying bricks or stones.
The example performance of table 2 furnace of calcium carbide high-strength high-alumina of the present invention brick
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Al 2O 3 | 84.6 | 82.2 | 80.0 |
| SiO 2 | 14.2 | 14.7 | 14.8 |
| Fe 2O 3 | 1.10 | 1.15 | 1.16 |
| Volume density (g/cm 3） | 2.79 | 2.78 | 2.77 |
| Apparent porosity (%) | 14.0 | 14.6 | 14.8 |
| Cold crushing strength (MPa) | 77 | 76 | 74 |
| Strength at normal temperature (MPa) | 14.0 | 13.2 | 13.5 |
| 1500 DEG C × 2h permanent line change (%) | 0.08 | 0.02 | -0.02 |
| 0.2MPa refractoriness under load (DEG C) | 1530 | 1535 | 1530 |
| The dimensional precision (%) ensured | ≤±0.1 | ≤±0.1 | ≤±0.1 |
Embodiment 2:
Furnace of calcium carbide high-strength high-alumina brick formula (weight percentage) adopting homogenizing alumina to prepare is as follows:
The 88 homogenizing alumina of 5 ~ 3 ㎜, 10%
The 88 homogenizing alumina of 3 ~ 1 ㎜, 35%
The 88 homogenizing alumina of 1 ~ 0 ㎜, 12%
320 object 99 plate diamond spars, 12%
220 object 80 rotary kiln alumina, 18%
The fine and close flint clay of 220 objects, 4%
320 object kyanites, 3%
Suzhou white clay, 6%
Additional:
Yellow starch gum, 0.5%
Tensio-active agent (sulfonated naphthol yuban and poly carboxylic acid are by weight the mixture of 1:1), 0.2%
Clear water, 2.5%
Specific embodiment comprises following a few part:
(1) fine powder is pre-mixed.Weigh by proportion speed; 320 order 99 plate diamond spars, 220 order 80 rotary kiln alumina, 220 orders fine and close flint clay, 325 order kyanites, Suzhou white clay, add together in powder stirrer and be stirred to 15 minutes, for subsequent use after discharging.
(2) aggregate mixing.Weigh by proportion speed; After 88 homogenizing alumina 5 ~ 3 ㎜, 3 ~ 1 ㎜, 1 ~ 0 ㎜ add together and are dry mixed in machine, add yellow starch gum, tensio-active agent, mix after 5 minutes, then add clear water and stir, make its surface wettability, mix 5 minutes, then will be pre-mixed fine powder, and weigh by proportion speed; Add in stirrer and stir 15 minutes.
(3) be shaped.Adopt friction press or hydropress shaping.
(4) dry.Be 120 DEG C of dry kiln inside holding 36h in temperature.
(5) burn till.Dried base substrate is burnt till in 1460 DEG C of insulation 4h.
Embodiment 3:
Furnace of calcium carbide high-strength high-alumina brick formula (weight percentage) adopting homogenizing alumina to prepare is as follows:
The 88 homogenizing alumina of 5 ~ 3 ㎜, 15%
The 88 homogenizing alumina of 3 ~ 1 ㎜, 40%
The 88 homogenizing alumina of 1 ~ 0 ㎜, 15%
320 object 99 plate diamond spars, 5%
220 object 80 rotary kiln alumina, 12%
The fine and close flint clay of 220 objects, 3%
320 object kyanites, 2%
Suzhou white clay, 8%
Additional:
Yellow starch gum, 0.6%
Mix tensio-active agent (sulfonated naphthol yuban and poly carboxylic acid are by weight the mixture of 1:1), 0.25%
Clear water, 2%
Specific embodiment comprises following a few part:
(1) fine powder is pre-mixed.Weigh by proportion speed; 320 order 99 plate diamond spars, 220 order 80 rotary kiln alumina, 220 orders fine and close flint clay, 325 order kyanites, Suzhou white clay, add together in powder stirrer and be stirred to 20 minutes, for subsequent use after discharging.
(2) aggregate mixing.Weigh by proportion speed; After 88 homogenizing alumina 5 ~ 3 ㎜, 3 ~ 1 ㎜, 1 ~ 0 ㎜ add together and are dry mixed in machine, add yellow starch gum, tensio-active agent, mix after 5 minutes, then add clear water and stir, make its surface wettability, mix 10 minutes, then will be pre-mixed fine powder, and weigh by proportion speed; Add in stirrer and stir 12 minutes.
(3) be shaped.Employing hydropress is shaped.
(4) dry.Be 160 DEG C of dry kiln inside holding 24h in temperature.
(5) burn till.Dried base substrate is burnt till in 1450 DEG C of insulation 5h.
Claims (2)
1. the furnace of calcium carbide high-strength high-alumina brick adopting homogenizing alumina to prepare, it is characterized in that, it comprises the component of following weight percent:
Said components weight percent sum is 100%;
With the weight sum of said components for benchmark, additional:
Yellow starch gum 0.3% ~ 0.6%;
Tensio-active agent 0.15% ~ 0.25%;
Water 2% ~ 3%;
Wherein, described tensio-active agent is sulfonated naphthol yuban and the poly carboxylic acid mixture by weight 1:1;
Described sulfonated naphthol yuban is the polymkeric substance that the sulfonated naphthol formaldehyde being Material synthesis with naphthols, the vitriol oil and formaldehyde is formed through condensation reaction.
2. prepare the method for furnace of calcium carbide high-strength high-alumina brick prepared by employing homogenizing alumina according to claim 1, it is characterized in that, the method comprises the steps:
(1) be pre-mixed fine powder: take 320 object 99 plate diamond spars, 220 object 80 rotary kiln alumina, 220 object flint claies, 320 object kyanites and Suzhou white clay by formula ratio, add together in powder stirrer and stir 10 ~ 20 minutes, for subsequent use after discharging;
(2) aggregate mixing: take 88 homogenizing alumina 5 ~ 3 ㎜ by formula ratio, after 3 ~ 1 ㎜ add and be dry mixed in powder stirrer together with 1 ~ 0 ㎜, add yellow starch gum and tensio-active agent again, mix after 3 ~ 5 minutes, add water stirring, make material surface wettability, mix after 5 ~ 10 minutes, the mixing fine powders that step (1) obtains is added wherein, continue stirring 10 ~ 20 minutes;
(3) shaping: material that step (2) is obtained adopt friction press or hydropress shaping;
(4) dry: material step (3) obtained is at 80 ~ 160 DEG C of dry kiln inside holding 24 ~ 48h;
(5) burn till: step (4) dried base substrate is burnt till in 1450 DEG C ~ 1470 DEG C insulation 3 ~ 5h, to obtain final product.
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| CN110436891A (en) * | 2019-07-18 | 2019-11-12 | 武汉科技大学 | A kind of ladle slag line low carbon magnesia carbon brick and preparation method thereof |
| CN111423220B (en) * | 2020-05-18 | 2022-06-17 | 中冶焦耐(大连)工程技术有限公司 | Baking-free refractory brick and low-emission, energy-saving and intelligent production process thereof |
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| CN102070347A (en) * | 2009-11-23 | 2011-05-25 | 德清县钢友耐火材料有限公司 | Preparation method for high-alumina bricks |
| CN103058681B (en) * | 2013-01-11 | 2014-10-22 | 成都蜀冶新材料有限责任公司 | Andalusite refractory castable and application method thereof |
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