| Quantity: | |
|---|---|
200/325mesh
SEPPE BAUXITE
25083000
REFRACTORY FINE POWDER / 200 & 325 MESH
High-alumina fine powder for refractory castables, mortars and brick formulations. Available in 200 mesh and 325 mesh, SEPPE calcined bauxite powder provides the fine mineral fraction used alongside coarser aggregates, binders and other matrix ingredients.
Calcined bauxite powder is produced by milling and classifying calcined bauxite into fine fractions. It is distinct from coarse bauxite sand or aggregate: the powder contributes to the fine-particle matrix of a refractory formulation.
Al₂O₃ grades can be selected to suit the formulation. Silica, iron oxide, titania and other constituents should be considered together with alumina content.
200 mesh and 325 mesh provide two common fineness options. Particle-size distribution affects packing and mixing behaviour and should match the complete recipe.
Select the chemical grade and fineness separately. The chemical ranges below describe the product family and are not the guaranteed analysis of one powder grade.
| Al₂O₃ | 75–90% · grade-dependent |
|---|---|
| SiO₂ | 6–18% |
| Fe₂O₃ | 0.5–2.5% |
| TiO₂ | 2–3% |
| P₂O₅ | 0–0.3% |
| MgO | 0–0.2% |
| CaO | 0–0.4% |
| K₂O + Na₂O | 0–0.4% |
| Product form | Calcined mineral powder |
|---|---|
| Standard fineness | 200 mesh / 325 mesh |
| Alumina grade | Specified separately from fineness |
| Sieve requirement | Agreed passing percentage or maximum residue |
| Appearance | May vary with material grade and feedstock |
| Loss on ignition | 0.1–0.5% · reference range |
| Moisture | Limit agreed for the ordered grade |
| Additional data | Particle-size distribution and density basis, if required |
Final acceptance values must be stated in the powder-specific quotation or specification. Mesh designation alone does not define a complete particle-size distribution or a 100% passing requirement.
A fine fraction for refractory recipes that specify 200 mesh material. Confirm the required sieve residue and how the powder combines with the other particle sizes.
A finer option for recipes requiring a finer mineral fraction, including selected mortar, slurry and coating formulations. Confirm mixing behaviour and binder compatibility through trials.
Used as a fine mineral ingredient in the following refractory systems. The photographs illustrate application settings, not finished products supplied as this powder.
Refractory Castables
Fine bauxite forms part of the matrix between larger aggregate particles. It is combined with binders and other fines to build the required castable recipe.
Refractory Mortars & Slurries
A refractory fine fraction for compatible jointing mortars and slurry formulations. Binder selection, water addition and working consistency are determined by the complete formulation.
Refractory Brick Formulations
Used in the fine-particle portion of selected high-alumina brick mixes, alongside coarser fractions and binders before forming and firing.
Lining Coatings & Repair Formulations
A possible mineral component in selected ladle and furnace lining coating or repair mixes. The grade must match the lining chemistry, slag exposure and service conditions.
Bauxite powder is not a ready-mixed castable, mortar or coating. For steel-contact or severe slag service, suitability must be established for the finished refractory system.
Selected bauxite is calcined, then milled and classified into the required powder fineness. The rotary-kiln and production-site photographs below show the manufacturing context; fine grinding is a separate processing stage.
Rotary-Kiln Calcination
Calcination of the selected bauxite feedstock.
Bauxite Production Site
Material processing and handling facilities.
Select the calcined bauxite grade for the target refractory chemistry.
Reduce the calcined material to powder for the specified fineness.
Separate the milled material to obtain the agreed powder size profile.
Pack by product grade, mesh specification and lot identification.
Standard packing options include 25 kg or 50 kg bags and 1 MT bulk bags. Other bag weights, liners, pallet arrangements and labels can be agreed with the order. The photographs show packaging examples; confirm suitability for fine powder.
50 kg bags
1 MT bulk bags
1.25 MT
1.35 MT
Keep bags sealed, dry and protected from contamination. Follow the applicable safety data sheet for powder handling and dust-control requirements.
It supplies a high-alumina fine fraction in refractory castables, mortars and brick mixes, and in selected lining coating or repair formulations. It is an ingredient for formulation, not a ready-to-use refractory mix.
325 mesh is the finer option within the same sieve system. Choose by the required particle packing, mixing behaviour and application method. Finer powder is not automatically the better choice; confirm the grade in your formulation.
Not directly. Calcined bauxite powder is a mineral raw material, not a hydraulic binder. Its chemistry and particle-size distribution differ from refractory cement and reactive alumina. Any substitution requires formulation testing.
No. Colour alone does not identify mesh size, alumina content or performance. The photographs show appearance examples; select the material using the grade specification and the relevant sample.
No. This page covers a powder product family with an Al₂O₃ reference range of 75–90%, depending on grade. The ordered grade has its own chemistry limits; 200 mesh and 325 mesh describe fineness, not alumina content.
Yes. Send the required alumina grade, mesh size, application and quantity. Request the matching powder TDS, available test results and a sample for evaluation before confirming the supply specification.
Send your target alumina content, 200 or 325 mesh requirement, application, order quantity and packing preference. SEPPE can help confirm the matching grade and available sample.
