Flotation Pyrite Concentrate

Flotation pyrite concentrate is high‑grade pyrite purified by mineral processing (FeS₂ content usually ≥45%, low impurities, high grade). Compared with ordinary pyrite powder, it has higher purity and more stable performance, and plays a more prominent role in sulfuric acid production, non‑ferrous metal roasting, grinding wheel filling, and wastewater treatment. The details are as follows:

Sulfuric Acid Production (Core Application)

Raw material for acid making: Roasted at high temperature to produce SO₂ (core reaction: 4FeS₂ + 11O₂ = 2Fe₂O₃ + 8SO₂), serving as the main sulfur source for contact sulfuric acid production with low cost and high sulfur utilization.

Stable furnace conditions: High purity and uniform composition ensure stable heat release during roasting, avoiding furnace temperature fluctuations and guaranteeing continuous and efficient operation of the acid‑making system.

By‑product utilization: The roasted iron concentrate (cinder) contains ≥55% iron and can be directly used as ironmaking raw material, realizing comprehensive utilization of sulfur and iron resources.

Non‑ferrous Metal Roasting (Copper, Zinc, Lead Smelting)

Efficient slag formation and fluxing: High‑purity FeS₂ provides sufficient Fe and S, quickly forming highly fluid fayalite slag with SiO₂, strengthening slag‑metal separation and improving metal recovery.

Synergistic desulfurization/sulfidation: Acts as a sulfidizing agent to decompose refractory substances such as zinc ferrite in zinc calcine, increasing zinc leaching rate; also assists in removing harmful impurities (e.g., arsenic, antimony) from ores.

Energy‑saving temperature control: Sufficient heat release during roasting reduces fuel consumption in smelting and stabilizes furnace temperature and reaction atmosphere.

Grinding Wheel Filler (Industrial Abrasives)

Performance enhancement: High purity and uniform particle size strengthen hardness, wear resistance, and heat resistance of grinding wheels as inert filler, prolonging service life; reduces resin binder dosage and production cost.

Lubrication and wear reduction: Lubricity of sulfur in the concentrate reduces friction heat and wheel loss during grinding, improving grinding precision and stability.

Environmental safety: Low impurities lead to less harmful gas emission at high temperatures, suitable for manufacturing high‑end resin and ceramic grinding wheels.

Environmental Wastewater Treatment

Efficient denitrification (autotrophic denitrification): Highly active S²⁻/Fe²⁺ serve as electron donors to rapidly reduce NO₃⁻ in wastewater to N₂ without external carbon sources, suitable for denitrification of industrial and municipal wastewater with low C/N ratio.

Deep heavy metal removal: Stable release of S²⁻ under acidic conditions forms highly insoluble sulfide precipitates with Cu²⁺, Pb²⁺, Cd²⁺, Hg²⁺, etc., achieving heavy metal removal rate ≥99%.

Simultaneous purification: Synergistically removes phosphorus and partial organic matter in wastewater with low sludge yield and more stable effluent quality.

Yunfu Pyrite Mine boasts large ore reserves and output, high grade, low impurities, stable quality and guaranteed delivery time.