| Company Name: |
VAYUNANDAN IMPEX
|
| Tel: |
+919836761502 |
| Email: |
VAYUNANDANIMPEX@GMAIL.COM |
| Products Intro: |
Product Name:Fire Clay
Purity:99% Package:1 kg,5 kg, 10 kg,25kg and 1 MT
|
| Company Name: |
City Chemical LLC
|
| Tel: |
1-203-932-2489 |
| Email: |
sales@citychemical.com |
| Products Intro: |
|
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| | FIRE CLAY Basic information |
| Product Name: | FIRE CLAY | | Synonyms: | FIRE CLAY | | CAS: | | | MF: | | | MW: | 0 | | EINECS: | | | Product Categories: | | | Mol File: | Mol File | ![FIRE CLAY Structure]() |
| | FIRE CLAY Chemical Properties |
| | FIRE CLAY Usage And Synthesis |
| Description | Fireclay denotes a silica-rich natural clay that can withstand a high firing temperature above the pyrometric cone equivalent (PCE) of 19
without melting, cracking, deforming, disintegrating, or softening. Typically, a good fireclay
should have 24 to 26 vol.% plasticity, and shrinkage after firing should be within 6 to 8 vol.%
maximum. Fireclays are mostly made of kaolinite, but some Fe2
O3
and minor amounts of
Na2O, K2O, CaO, MgO, and TiO2
are invariably present depending on the mineralogy and geology of the deposit, making it gray in color. | | Uses | As a general rule fireclays are used in both shaped refractories (i.e., bricks) and monolithic refractories (i.e., castables), while super-duty plastic
fireclay is used in the preparation of castable recipes. Therefore, the major applications of fireclays are in power generation, such as in boiler furnaces, in glass-melting furnaces, in
chimney linings, in pottery kilns, and finally in blast furnaces where the backup lining is
done almost entirely with fireclay bricks. Pouring refractories like sleeves, nozzles, stoppers,
and tuyers are also made of fireclay. | | Preparation | Mined clay is stacked in the factory yard and allowed to weather
for about 1 year. For daily production of different types of refractories, this weathered clay is
taken and mixed in different percentages with grog (i.e., spent fireclay). The mixture is sent to
the grinding mill from where it is transferred to the pug mill. In the pug mill a suitable proportion of water is added so as to give it proper plasticity. The mold is supplied to different
machines for making standard bricks or shapes. Intricate shapes are made by hand. The
bricks thus made are then dried in hot floor driers and after drying are loaded in kilns for
firing. The firing ranges are, of course, different for different grades of refractories. After
firing, the kilns are allowed to cool, then the bricks are unloaded. Upon burning fireclay is
converted into a stonelike material that is highly resistant to water and acids, while manufacturing high aluminous fire-bricks bauxite is added along with grog in suitable proportions. | | Reactions | Upon firing, fireclay yields a strong ceramic product with a composition close to the theoretical composition of metakaolin (i.e., 54.1 wt.% SiO2
and 45.9 wt.% Al2O3), but in practice it contains between 50 and 60 wt.% SiO2, 24 and 32 wt.%
Al2O3, no more than 25 wt.% Fe2O3
and a loss on ignition of 9 to 12 wt.%. | | General Description | Fireclay is classified
under acid refractories, that is, refractories that are not attacked by acid slags. In practice,
refractoriness and plasticity are the two main properties required for the manufacture of refractory bricks; hence fireclays are grouped according to the maximum service temperature of
the final product before melting in: low-duty fireclay (max. 870°C, PCE 18 to 28), mediumduty fireclay (max. 1315°C, PCE 30), high-duty fireclay (max. 1480°C, PCE 32), and super-duty
fireclay (max. 1480°C–1619°C, PCE 35). In practice, it has been observed that the higher the
alumina content in the fireclay, the higher the melting point. All fireclays are not necessarily
plastic clays. In such cases, some plastic clay, like ball clay, is added to increase plasticity to
a suitable degree. A good fireclay should have 24 to 26% plasticity, and shrinkage after firing
should be within 6 to 8% maximum. It should also not contain more than 25% Fe2O3. |
| | FIRE CLAY Preparation Products And Raw materials |
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