This FeS2 pyrite serves as a professional auxiliary material for blast furnace ironmaking and converter steelmaking, leveraging the reducibility of FeS2 to assist desulfurization and reduce smelting energy consumption. It is widely used in the production of free-cutting steel (Y12, 1215, 303), gray cast iron (HT200, HT250), and ductile iron (QT450-10, QT500-7), perfectly matching the metallurgical process requirements of steel mills and foundries.
Key LSI Keywords: FeS2 reducer, metallurgical desulfurization auxiliary, blast furnace flux, converter desulfurizer, sulfur enhancement pyrite, free-cutting steel desulfurization, gray cast iron sulfur adjustment, ductile iron smelting auxiliary.
| Metallurgical Indicators | Standard Value | Metallurgical Significance |
|---|---|---|
| Sulfur (S) Content | ≥30% | Ensures sufficient FeS2 for reducibility, supports efficient desulfurization |
| Desulfurization Absorption Rate | ≥90% | Guarantees stable sulfur removal, avoids sulfur fluctuation in molten steel |
| Fatal Impurities (P, As, Pb, Zn) | P≤0.03%, As≤0.05%, Pb≤0.015%, Zn≤0.015% | Prevents hot/cold brittleness of steel, protects blast furnace/converter lining |
| Particle Size | 5–20mm Lump | Matches furnace feeding system, ensures uniform reaction and high utilization |
| FeS2 Purity | ≥85% | Strengthens reducibility, ensures stable exothermic reaction for energy saving |
| Decomposition Temperature | 1000–1300℃ | Consistent with blast furnace/converter smelting temperature |
| Compliance Standard | YB/T 4551-2016, ISO 9001:2015 | Meets national metallurgical industry standards, safe for mass production |
In the smelting of free-cutting steel (Y12, 1215, 303), this pyrite assists in desulfurization while providing stable sulfur sources to form MnS inclusions, which improve the machinability of steel. It reduces cutting resistance, lowers tool wear, and ensures the surface finish of workpieces, perfectly matching the precision requirements of free-cutting steel production.
For gray cast iron (HT200, HT250) production, the FeS2 pyrite adjusts the sulfur content of molten iron to 0.08–0.12%, optimizes graphite morphology, and improves the tensile strength and casting qualification rate of gray cast iron. The exothermic reaction of FeS2 decomposition also supplements the smelting heat, reducing energy consumption.
In ductile iron (QT450-10, QT500-7) smelting, the product assists in desulfurization to control the sulfur content below 0.02%, avoiding the damage of excessive sulfur to the spheroidizing effect. It also optimizes the fluidity of molten iron, reduces shrinkage defects, and ensures the ductility and toughness of ductile iron products.
As a core auxiliary for blast furnace ironmaking and converter steelmaking, it is added to the feeding system to assist in removing sulfur-containing impurities from molten iron/steel. The FeS2 reducibility drives the desulfurization reaction, transferring sulfur to furnace slag for discharge, while the exothermic decomposition reduces coke and fuel consumption, achieving dual effects of desulfurization and energy saving.
With 18+ years of experience in metallurgical auxiliary materials R&D and production, we are a trusted supplier for 40+ large and medium-sized steel mills and foundries worldwide. Our pyrite is produced in strict accordance with YB/T 4551-2016 standard (drafted by Wuhan Iron and Steel Group and other authoritative institutions), with a professional R&D team composed of senior metallurgical engineers (20+ years of on-site experience in blast furnace/converter smelting).
Each batch of pyrite undergoes strict quality testing, including desulfurization absorption rate, impurity content, particle size distribution, and FeS2 purity, with complete metallurgical testing reports available for inspection. We provide free on-site technical guidance by metallurgical engineers, customizing the adding ratio according to your furnace type, product type (free-cutting steel, gray cast iron, ductile iron), and smelting parameters.
We have passed ISO 9001:2015 quality management system certification and ISO 14001 environmental certification, ensuring that the product meets the green and low-carbon production requirements of the metallurgical industry. Free samples (500g–1kg) are provided for on-site smelting trials, ensuring the product matches your production needs before bulk purchase.
A: The FeS2 in pyrite has strong reducibility. At 1000–1300℃, it decomposes to release FeS and sulfur, which reacts with sulfur-containing impurities in molten iron/steel and alkaline flux to form stable CaS (discharged with slag) for auxiliary desulfurization. For free-cutting steel, it provides a stable sulfur source to form MnS inclusions, improving machinability; for gray cast iron and ductile iron, it optimizes graphite morphology and spheroidizing effect respectively.
A: The 5–20mm lump size is customized for metallurgical furnace feeding systems: it is compatible with vibrating feeders and belt conveyors (no clogging), can be evenly mixed with iron ore and coke (no segregation), and avoids dust loss (small particles ≤5mm) and uneven decomposition (large lumps ≥20mm). It is perfectly matched with 500–3000 m³ blast furnaces and 5–100t converters, ensuring a utilization rate of ≥96%.
A: We strictly control the FeS2 purity (≥85%) and sulfur content (≥30%) of each batch, and use high-precision screening equipment to ensure uniform particle size (5–20mm). The desulfurization absorption rate is tested for each batch, with a qualified rate of 100% (≥90%), ensuring stable desulfurization effect in continuous smelting. Our metallurgical engineers also provide on-site guidance to adjust the adding ratio, further ensuring stability.
A: Yes. The product is highly adaptable, suitable for both large steel mills and small-scale foundries. It does not require modifying existing smelting processes or adding special equipment, and can be directly added to the feeding system. We provide customized adding plans according to the scale of your foundry and the type of cast iron (gray cast iron/ductile iron), ensuring cost-effectiveness and stable performance.
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Our professional team will provide you with one-on-one service, answer your questions, and assist you in completing the purchasing process.
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