SU479744A1 - The method of firing thick-walled refractories - Google Patents
The method of firing thick-walled refractoriesInfo
- Publication number
- SU479744A1 SU479744A1 SU1742913A SU1742913A SU479744A1 SU 479744 A1 SU479744 A1 SU 479744A1 SU 1742913 A SU1742913 A SU 1742913A SU 1742913 A SU1742913 A SU 1742913A SU 479744 A1 SU479744 A1 SU 479744A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- products
- firing
- walled
- refractories
- thick
- Prior art date
Links
Landscapes
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
Изобретение относитс к технике получени легковесных огнеупорных изделий и может быть использовано в огнеупорном производстве .The invention relates to a technique for producing lightweight refractory products and can be used in refractory manufacturing.
Известен одностадийный способ обжига в туннельных печах фасонных легковесных изделий пластичного прессовани с выгорающими добавками. Обжиг ведут в окислительной среде.A single-stage method of burning in tunnel kilns of shaped lightweight plastic-molding products with burnable additives is known. Firing lead to an oxidizing environment.
Недостатками такого способа вл ютс воспламенение в процессе обжига продуктов возгонки выгораюи;их добавок, повышепие температуры, сопровождаемое быстрым протеканием процесса пиролиза выгорающих добавок внутри изделий, что приводит к по влению значительных трещин в издели х.The disadvantages of this method are the ignition during the firing process of the products of the sublimation burnout and their additives, the temperature increases, accompanied by the rapid process of pyrolysis of the burnable additives inside the products, which leads to the appearance of significant cracks in the products.
Известен также обжиг толстостенных огнеупорных изделий с выгорающей добавкой путем нагрева в две стадии. Однако полученные издели имеют низкое качество.Also known is the firing of thick-walled refractory products with a burnable additive by heating in two stages. However, the resulting products are of poor quality.
С целью повыщени качества изделий предложено нагрев на первой стадии осуществл ть при 400-450°С в защитной среде, содержащей смесь продуктов возгонки выгорающих добавок и нейтральных газов, а на второй - при 1300-1400°С в окислительной среде.In order to improve the quality of the products, it was proposed to heat in the first stage at 400-450 ° C in a protective medium containing a mixture of sublimation products of burnable additives and neutral gases, and in the second - at 1300-1400 ° C in an oxidizing medium.
Отформованные фасонные легковесные-издели предварительно высущивают в сушильном шкафу, а затем обжигают в электрической печи с силлитовыми стержн ми.Molded shaped lightweight products are predried in a drying cabinet, and then burned in an electric furnace with sillite rods.
На первой стадии обжига издели , помещенные в муфел , нагревают но 400-450°С со скоростью 40°С/час в восстановительной среде, котора создаетс за счет выделени In the first stage of firing, the products placed in the muffle are heated but at 400-450 ° C at a rate of 40 ° C / hour in a reducing environment, which is created by the release of
летучих при нагревании. На этой стадии практически выдел ютс все летучие, составл ющие 15% от ъеса высущенных изделий, и остаетс только углерод (кокс). Прочность изделий после низкотемпературной термообработки 8-10 кг/см.volatile when heated. At this stage, almost all volatiles are released, constituting 15% of the weight of the dried products, and only carbon (coke) remains. The strength of products after low-temperature heat treatment is 8-10 kg / cm.
Вторую стадию обжига (1300-1400°С) осуществл ют в той же печи, но без муфел , при следующем режиме: температура 450- 1000°С, скорость нагрева 60-80°С/час, вылержка час, температура 1000-1400°С, скорость нагрева 50-70°С/час, выдержка при конечной температуре 3-5 час.The second firing stage (1300-1400 ° C) is carried out in the same furnace, but without the muffle, in the following mode: temperature 450-1000 ° C, heating rate 60-80 ° C / h, lasts an hour, temperature 1000-1400 ° C, heating rate of 50-70 ° C / hour, holding at a final temperature of 3-5 hours.
Полученные издели обладают высоким качеством , не имеют трещин и посечек. Прочкость их после обжига 20-25 кг/см.The resulting products are of high quality, have no cracks and cuts. Their strength after firing is 20-25 kg / cm.
Предмет изобретени Subject invention
Способ обжига толстостенных огнеупорных изделий с выгорающей добавкой путемThe method of firing thick-walled refractory products with a burnable additive by
нагрева в две стадии, отличающийс тем, что, с целью повышени качества изделий , нагрев на первой стадии осуществл ют при 400-450°С в защитной среде, содержащей смесь продуктов возгонки выгорающихheating in two stages, characterized in that, in order to improve the quality of the products, the heating in the first stage is carried out at 400-450 ° C in a protective medium containing a mixture of sublimation products of burnable
добавок и нейтральных газов, а на второй - при 1300-1400°С в окислительной среде.additives and neutral gases, and the second - at 1300-1400 ° C in an oxidizing environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU1742913A SU479744A1 (en) | 1972-02-01 | 1972-02-01 | The method of firing thick-walled refractories |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU1742913A SU479744A1 (en) | 1972-02-01 | 1972-02-01 | The method of firing thick-walled refractories |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU479744A1 true SU479744A1 (en) | 1975-08-05 |
Family
ID=20501666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU1742913A SU479744A1 (en) | 1972-02-01 | 1972-02-01 | The method of firing thick-walled refractories |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU479744A1 (en) |
-
1972
- 1972-02-01 SU SU1742913A patent/SU479744A1/en active
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