- Refractory Raw Materials
Calcined Bauxite Ceramic Foundry Sand Corundum Flint Clay Fluorite Mulite Silica Fume Silicon Carbide Silicon Metal Alpha Alumina Powder Spinel Alumina Bubble Aluminum Powder Bentonite Boron Carbide Ceramic Sand Chromium Oxide Green Cordierite Explosion-proof Fiber Forsterite Fused Silica Graphite High Alumina Cement Kyanite Group Minerals Potassium Feldspar Powdery Instant Sodium Silicate Pure Calcium Aluminate Cement Spherical Asphalt White Clay Zirconite Lignin Synthesis of Ferro Silicon Nitride Homogenized Bauxite
- Refractory Products
- Monolithic Refractories
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- Metallurgical Auxiliary Material
- Industrial Kilns And Parts
Silica Fume
Description
The silica fume is amorphous silica. it is formed by the rapid oxidation and condensation of SiO2 and Si gas and oxygen in air when smelting ferrosilicon alloy and industrial silicon. It is a kind of gray ultra fine silicon powder material.widely used in coke oven, iron making, steel making, steel rolling, non-ferrous metal, glass, ceramics, power and refractories and other industries.
The specific applications of micro silica fume in refractories are as follows:
1. Used in high grade high performance low cement refractory castable and preforms, its service life is three times that of common castable, the fire resistance is increased about 100 ℃, and the high temperature strength and thermal shock resistance are obviously improved.
2. Used for large iron trenches and ladle materials, air-permeable bricks, smear patching materials, etc.
3. Application of self-flow refractory pouring materials and dry-wet spray construction.
4. Oxide bonded silicon carbide products (ceramic kiln furniture, flame barrier, etc.)
5. High temperature calcium silicate light heat insulation material.
6. Corundum mullite push plate for electric porcelain kiln.
7. High temperature wear resistant materials and products.
8. Corundum and ceramic products.
9. Salon binding products.
Besides being widely used in monolithic refractories, it is also widely used in fused and sintered refractories.
1. Used in high grade high performance low cement refractory castable and preforms, its service life is three times that of common castable, the fire resistance is increased about 100 ℃, and the high temperature strength and thermal shock resistance are obviously improved.
2. Used for large iron trenches and ladle materials, air-permeable bricks, smear patching materials, etc.
3. Application of self-flow refractory pouring materials and dry-wet spray construction.
4. Oxide bonded silicon carbide products (ceramic kiln furniture, flame barrier, etc.)
5. High temperature calcium silicate light heat insulation material.
6. Corundum mullite push plate for electric porcelain kiln.
7. High temperature wear resistant materials and products.
8. Corundum and ceramic products.
9. Salon binding products.
Besides being widely used in monolithic refractories, it is also widely used in fused and sintered refractories.
The technical parameters of the product are as follows:
| Micro Silica/Silica Fume | ||||||
| Item | SF96 | SF93 | SF90 | SF88 | SF85 | |
| Chemical Content,% | SiO2, ≥% | 96.0 | 93.0 | 90.0 | 88.0 | 85.0 |
| AL2O3 , ≤ % | 1.0 | 1.0 | 1.5 | -- | -- | |
| Fe2O3 , ≤1% | .0 | 1.0 | 2.0 | -- | -- | |
| CaO+MgO, ≤% | 1.0 | 1.5 | 2.0 | -- | -- | |
| K2O+Na2O,≤ % | 1.0 | 1.5 | 2.0 | -- | -- | |
| C, ≤% | 1.0 | 2.0 | 2.0 | 2.5 | 2.5 | |
| Physical Properties | Loss on Ignition (LOI), ≤ % | 1.0 | 3.0 | 3.0 | 4.0 | 6.0 |
| PH , % | 4.5～6.5 | 4.5～7.5 | 4.5～7.5 | 4.5～8.5 | - | |
| Oversize percent retained on 45-um（325 sieve）, ≤ % | 3.0 | 3.0 | 5.0 | 8.0 | 10.0 | |
| Specific Surface, ㎡/g, ≤% |
15 | 15 | 15 | 15 | 15 | |
| Moisture , ≤% | 1.0 | 2.0 | 2.5 | 3.0 | 3.0 | |
In terms of grain size, the fineness of silica fume is less than 1μm and the average particle size is 0.1-0.3μm, which is a gray state.
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