Semi Coke (SC)
Semi Coke
Semi coke—Lan Tan (blue coke) in Chinese industrial usage—is manufactured by low-temperature carbonization of selected bituminous coals in roughly the 500–750°C range, a deliberately milder thermal path than conventional high-temperature coke ovens. That profile yields a porous, higher electrical-resistance carbonaceous reductant that behaves differently from dense metallurgical coke when charged to submerged arc furnaces (SAFs), where arc stability and electrode economics depend on how the burden column conducts and dissipates heat. Our Lan Tan–style semi coke is aligned with the published targets of fixed carbon ≥84%, sulfur ≤0.4%, ash ≤9%, and phosphorus ≤0.03%, which is the chemistry band ferroalloy producers use when they must limit sulfur and phosphorus carryover while still optimizing furnace resistance and energy per tonne of alloy. Ferrosilicon, silicon manganese, ferrochrome, and calcium carbide circuits commonly specify semi coke as a primary reductant and carbon carrier because the material couples reduction chemistry with the electrical characteristics SAF operation requires. Beyond metallurgy, the same low-temperature carbonization heritage supports substitution of semi coke for raw steam coal in industrial boilers and distributed thermal plants where regulators and buyers favor lower-sulfur solid fuels. In supply-chain terms, semi coke links traditional Lan Tan production clusters to modern ferroalloy smelting and clean-energy-adjacent fuel markets without pretending to match the fixed-carbon extremes of petroleum-coke–derived carbon additives.
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Technical Characteristics & Performance
Key Features
- High fixed carbon content: ≥84%
- Low sulfur content: ≤0.4%
- Low ash content: ≤9%
- Low phosphorus content: ≤0.03%
Additional Benefits
- High specific resistance
- No smoke or odor during use
- High conductivity
- Stable performance
Available Particle Sizes
Custom particle size distributions are available — tell us your furnace type and feeding method, and we will recommend the optimal sizing for maximum dissolution rate and carbon recovery.
Frequently Asked Questions About Semi Coke
What is Semi Coke (Lan Tan)?
What are the main applications of Semi Coke?
About Panson Carbon
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Semi Coke Applications
Steel & Iron
Carbon additive for steelmaking restores bath carbon lost to oxidation during melting and refining—EAF heats often see on the order of 0.15–0.25% carbon burn-off per heat from scrap and slag interaction—so operators can hold narrow chemistry bands from charge to tap. In EAF practice, recarburizer and carbon raiser additions are timed with power-on, bath formation, and ladle treatment to match dissolution behavior to tap-to-tap rhythm and energy use. Basic oxygen furnace (BOF) and secondary steelmaking still rely on controlled carbon inputs and trim additions where sulfur, nitrogen, and ash limits define grade acceptance. Silicon carbide can act as a deoxidizer while contributing carbon and silicon, supporting slag–metal balance in demanding heats. CAC, GPC, CPC, Semi Coke, and SiC are selected for fixed carbon, impurities, and sizing that align with bucket, bath, or injection routes.
Foundry
Recarburizer for foundry work must track carbon equivalent (CE), inoculation response, and how quickly carbon dissolves in the melt—especially in coreless and channel induction furnaces where cycle time is tight. For ductile iron, sulfur pickup from a carbon raiser can erode nodularity unless low-sulfur graphite or calcined options are matched to the treatment recipe. Gray iron still benefits from clean, consistent carbon addition to support Type A graphite and fluidity without excess gas-forming residuals. Fine versus coarse sizing changes dissolution time at typical iron melting temperatures (~1,450–1,500 °C), influencing holding time and throughput. CAC, GPC, CPC, Semi Coke, and supporting alloys are chosen to stabilize CE, surface quality, and mechanical properties batch to batch.
Ferroalloys
Ferroalloy smelting in submerged arc furnaces (SAF) relies on carbon reductants with controlled sizing, low ash, and predictable reactivity to convert oxide ores into metallic alloys. Semi-coke and calcined anthracite serve as primary reductants for FeSi, SiMn, and silicon metal production, where lump integrity, furnace permeability, and impurity budgets (particularly phosphorus, sulfur, and ash) directly impact alloy grade, energy consumption, and furnace stability.
Interested in Semi Coke?
Request a free sample to validate performance in your own furnace, or speak with our technical team about optimizing your carbon addition practice for better recovery and lower total cost.
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