Separate the actual addition points, application-grade product boundaries and validation requirements for silicon and ferroalloy materials across shaped and monolithic refractory production. Formulation, grade, dose and performance still require an actual SKU, technical documents and trials.
PROCESS & EQUIPMENT
Production routes and key equipment
Carbon-bonded bricks and functional refractories
Covers MgO-C, MgO-CaO-C, alumina-magnesia-carbon and formulation-confirmed alumina-carbon or Al₂O₃-SiC-C functional shapes; metallic powders are not used in every shaped refractory.
Silicon metal powder↗Closed metering and mixing before formingA validated antioxidant addition for a carbon-containing formulation; sizing, surface oxidation, binder, heat treatment and service atmosphere require joint review.
Refractory-grade ferrosilicon powder↗Batching after confirmation of a refractory antioxidant fine-powder gradeOnly a separately specified fine-powder candidate is meant; ordinary steelmaking ferrosilicon lump is not direct refractory powder feed.
Aluminium-silicon alloy powder for refractories (related material)Conditional antioxidant-addition point in a carbon-containing formulationSimilar names, forms or uses do not make products interchangeable; confirm product identity, specification, application process and order documents separately.
Silicon-nitride-bonded silicon-carbide products
An in-situ nitriding route and a route using purchased pre-synthesised silicon nitride powder must remain separate; similar names do not make the feeds interchangeable.
Silicon metal powder↗SiC body batching, forming and precursor stage before nitridingAn in-situ reaction silicon source for forming the Si₃N₄ bond; when the process purchases Si₃N₄ powder directly, silicon-metal demand must not be assumed.
Reaction-bonded and silicon-infiltrated silicon-carbide products
Select powder or granular silicon feed from body carbon, pore network and target residual silicon; aluminium-alloy charging practice must not be copied into silicon infiltration.
Industrial silicon for infiltration↗Controlled molten-silicon or vacuum infiltration of a porous SiC bodyUse only an application grade with specifically confirmed sizing, fines, Fe/Al/Ca and infiltration behaviour.
Silicon metal powder↗Batching or reaction point when a powder silicon source is formally specifiedA powder route requires separate confirmation of full size distribution, dispersion, oxidation, contamination and dust safety; lump/granule specifications do not transfer.
SiAlON-bonded specialty shaped products
Only for a documented in-situ synthesis route; a pre-synthesised SiAlON-powder route does not automatically consume silicon metal.
Silicon metal powder↗Batching, forming and precursor stage for controlled nitridingA candidate silicon source for in-situ SiAlON formation, requiring joint confirmation with the actual aluminium source, oxide system, atmosphere and finished-product trials.
Blast-furnace taphole clay
Taphole clay and trough material have different formulations, installation and acceptance criteria and must not be treated as one generic monolithic.
Nitrided ferrosilicon↗Application-grade addition during dry batching and mixing before extrusionOnly a refractory application grade reviewed for the taphole-clay formulation, Fe-Si-N phases, total N, free Si, sizing and powder safety; steel-grade lump/granule specifications do not transfer.
Silicon metal powder↗Formulation-confirmed closed metering and mixingA conditional antioxidant or reaction silicon source requiring trials and validation of extrusion, heat response and service performance.
Refractory-grade ferrosilicon powder↗Conditional batching after approval of a separate fine-powder specificationUse only when the formal taphole-clay formulation and powder TDS/SDS confirm it; ordinary ferrosilicon lump is outside this point.
Blast-furnace trough castables, ramming and gunning mixes
Carbon-containing systems such as Al₂O₃-SiC-C may use silicon metal or nitrided ferrosilicon, subject to the actual formulation and installation method.
Nitrided ferrosilicon↗Dry-mixing stage before packing after refractory-grade confirmationAccept by total N, Si, Fe, phase, free Si, sizing and moisture, then validate installation and finished performance without cross-formulation claims.
Silicon metal powder↗Closed metering and dry mixing in a carbon-containing formulationA formulation-conditional use, not a default for every trough castable or ordinary low-cement castable.
Refractory-grade ferrosilicon powder↗Conditional point after trial approval of a refractory fine-powder gradeValidate sizing, surface oxidation, formulation and installation system; suitability is not inferred from the FeSi grade name.
Other carbon-containing repair, ramming and gunning systems
There is no ferroalloy required across all such families; show a purchasable application only after a supplier formulation and plant trial are established.
Silicon metal powder↗Conditional antioxidant-addition point confirmed by a formal formulationConfirm binder, carbon content, installation method, temperature, atmosphere, sizing and dust control before trial use.
Refractory-grade ferrosilicon powder↗Batching only when a refractory fine-powder application grade is approvedThis is a separate refractory application-grade RFQ framework; it does not promise stock, fixed addition or performance before approval of an actual SKU and formal TDS/SDS/COA.
Boundary for microsilica, colloidal silica and ceramic silicon feeds
These materials are important to monolithics but are outside this silicon-metal and ferroalloy product scope.
Microsilica / silica fumeFine-particle packing and rheology system in LCC, ULCC and NCC castablesSimilar names, forms or uses do not make products interchangeable; confirm product identity, specification, application process and order documents separately.
Colloidal silica, SiC and Si₃N₄Inorganic bonding, aggregate/fine feed or pre-synthesised ceramic-phase pointEach has a separate material identity and cannot borrow the silicon-metal, silicon-carbon-alloy or nitrided-ferrosilicon detail page.
INDUSTRY APPLICATION
Industry, furnace, material and addition point
Confirm the process position before method and quantity calculations; an application relationship for one furnace or material must not be copied to another.
01
01 Furnace / equipment
Refractory batching, mixing and forming equipment, plus dedicated SiSiC/RBSiC processes
02 Material / output
Carbon-containing refractories and reaction-bonded or silicon-infiltrated silicon-carbide systems with reviewed formulation and dust risk
03 Addition point
Closed metering and mixing, or a validated reaction-bonding/infiltration stage
Crystalline silicon-metal powder produced by crushing, milling and classifying industrial silicon. Particle-size distribution, impurities, reactivity and dust hazards vary with feedstock, milling route and application. After technical review it may be used in carbon-containing refractories, dedicated SiSiC/RBSiC processes or direct silicone synthesis. Formal supply is governed by the actual SKU TDS, SDS/PSI and lot COA.
A refractory-application fine-powder family made from composition-confirmed ferrosilicon through controlled crushing, milling, classification, homogenisation, sampling and moisture-protected packing. It may serve as an antioxidant addition in validated carbon-containing refractory formulations such as MgO-C. Chemistry, sizing, surface condition and use require a formal TDS, powder SDS/PSI, lot COA and finished-product trials.
An industrial-silicon application family for RBSiC / SiSiC reaction bonding or silicon infiltration. Confirmed sizing, fines, Fe/Al/Ca and application-specific residuals, melting and infiltration behaviour must match the porous SiC-C body. This page is neither a separate chemical grade nor a stock claim.
A nitrided-ferrosilicon family identified principally by Si, N and an Fe matrix. Steelmaking grades and separately qualified refractory application grades require independent review of grade, phase, sizing, form, TDS and lot COA.
