Iron Sulfide- Environmental Pollution Treatment Chemicals

Product Overview

Iron Sulfide (FeS) is an industrial-grade precipitating agent manufactured through the thermal processing, high-temperature synthesis, and precision milling of natural iron and sulfur mineral raw materials, engineered specifically for heavy metal removal in complex industrial wastewater streams. Operating via controlled sulfide precipitation, it targets divalent and trivalent heavy metal ions—specifically Nickel (Ni2+), Copper (Cu2+), Zinc (Zn2+), Lead (Pb2+), and Cadmium (Cd2+)—forming stable, insoluble metal sulfide precipitates.

Unlike conventional hydroxide precipitation methods, iron sulfide functions effectively across a broader operating pH range (pH 4.0 to 10.0) and forms precipitates with lower solubility product constants (Ksp). This technical profile prevents the re-dissolution of heavy metals under fluctuating environmental conditions, satisfying regulatory discharge limits for electroplating, printed circuit board (PCB) manufacturing, and mining effluent facilities.

Key Features & Benefits

Low Solubility Product (Ksp): Metal sulfide precipitates exhibit low solubility compared to metal hydroxides, securing lower residual metal concentrations in treated effluent.

Wide Operating pH Window: Active across pH 4.0 to 10.0, reducing the chemical consumption typically required for rigorous pH adjustment phases.

Inhibits Complexed Metal Interference: Reacts effectively with chelated or complexed heavy metals (e.g., nickel-EDTA or copper-cyanide complexes) without requiring thermal destruction steps.

Controlled Reactivity & Sludge Stability: Formulated to minimize unwanted hydrogen sulfide (H2S) off-gassing during application while producing dense, easily dewaterable filter cake sludge.

Strict Batch Uniformity: Controlled mineral raw material selection and particle size reduction ensure consistent stoichiometric performance batch-to-batch.

Applications

Electroplating & Metal Finishing Effluents

Removal of dissolved nickel, copper, and zinc from electroplating rinse water and spent baths.

Printed Circuit Board (PCB) Manufacturing

Treatment of etching and chemical plating wastewater containing complexed copper and nickel chelates.

Mining & Acid Mine Drainage (AMD)

Mitigation of heavy metal contamination in acidic runoff and metallurgical processing wastewater.

Hazardous Waste Solidification

Chemical stabilization of heavy metal-bearing filter cakes prior to secure landfill disposal to prevent leaching under TCLP (Toxicity Characteristic Leaching Procedure) tests.

Technical Specifications

Parameter	Specification Standard	Test Method
Chemical Formula	FeS	ICP-OES / Gravimetric Analysis
Iron Sulfide (FeS) Content	>= 85.0% - 92.0% (Customizable)	Iodometric Titration
Appearance	Dark Gray to Black Crystalline Powder	Visual Inspection
Particle Size (D50)	75 um - 150 um (200 mesh - 100 mesh)	Laser Diffraction Particle Size Analyzer
Bulk Density	1.2 - 1.6 g/cm3	ASTM D1895
Moisture Content	<= 1.5%	Gravimetric (105 deg C, 2h)
Heavy Metal Impurities (As, Pb, Cd)	<= 10 ppm	ICP-MS

Manufacturing & Quality Control

Production relies on the thermal processing and solid-state synthesis of natural iron and sulfur mineral raw materials in dedicated processing lines.

Synthesis & Grinding: Processed in sealed industrial rotary kilns under an inert blanket atmosphere to maintain strict oxidation state control, followed by mechanical impact milling and air classification to achieve precise particle size distribution (D50) and optimized surface area for rapid reaction kinetics.

Batch Testing Protocol: Every production lot undergoes laboratory verification. Samples are analyzed via Inductively Coupled Plasma Mass Spectrometry (ICP-MS) for assay purity and trace contaminants. Jar testing is performed on standardized synthetic wastewater to validate heavy metal removal efficiency before final packaging.

Compliance & Documentation: Each shipment includes a lot-specific Certificate of Analysis (CoA) and a Safety Data Sheet (SDS) aligned with international GHS standards.

Customization & OEM Services

Particle Size Tailoring: Mill settings adjusted to deliver specific mesh sizes (e.g., ultrafine micronized powder or granular variants) depending on dosing system requirements (dry feed vs. slurry makeup).

Assay Adjustments: Formulations adjustable from 80% to 95% active FeS content to match specific municipal or industrial treatment economics.

Packaging Configurations:

25 kg moisture-resistant multi-wall paper bags with PE inner liners.
1,000 kg (1-metric-ton) polypropylene heavy-duty jumbo bags with discharge spouts.
Custom private-label palletization and moisture-barrier shrink-wrapping available for distribution partners and project contractors.

Frequently Asked Questions

Q: How does Iron Sulfide prevent hydrogen sulfide (H2S) gas release during wastewater treatment?

A: Iron sulfide has a low solubility product (Ksp), meaning the sulfide ion is tightly bound to iron. Unlike soluble sodium sulfide (Na2S) or sodium hydrosulfide (NaHS), which instantly release toxic H2S gas if the pH drops into acidic ranges, solid-state iron sulfide reacts directly with heavy metal ions via a controlled solid-liquid exchange mechanism, suppressing free volatile sulfide generation when handled within recommended operating parameters (maintaining reaction tank ventilation and pH >= 5.0).

Q: What is the optimal dosing ratio for treating nickel or copper-bearing wastewater?

A: The stoichiometric mass ratio depends on the initial concentration of heavy metal ions (Ni2+ or Cu2+). In industrial practice, jar testing is recommended prior to full-scale dosing. Generally, a molar excess of 1.1 to 1.3 relative to the target heavy metal concentration is applied to account for competing complexing agents in the wastewater matrix.

Q: Can Iron Sulfide break down complexed heavy metals like EDTA-chelated nickel?

A: Yes. Unlike standard hydroxide precipitation—which fails when heavy metals are bound to chelating agents like EDTA, citric acid, or cyanide—the thermodynamic driving force of metal sulfide formation is strong enough to displace chelating ligands. Iron sulfide precipitates chelated heavy metals without requiring preliminary breaking or thermal oxidation stages.

Q: What are the storage requirements and shelf life of Iron Sulfide powder?

A: The product must be stored in a cool, dry, well-ventilated indoor warehouse away from strong acids, moisture, and oxidizers. Bags must be kept off concrete floors using pallets and tightly resealed if partially used to prevent moisture absorption. When stored under proper dry conditions in sealed original packaging, the shelf life is 12 months.

Q: How do the physical characteristics of the sludge compare to hydroxide sludge?

A: Metal sulfide sludge generated using iron sulfide is denser, possesses a higher solid content, and exhibits a lower sludge volume index compared to loose metal hydroxide flocs. It dewaters more readily in plate-and-frame filter presses or belt filter presses, reducing total hazardous waste disposal volume and associated hauling costs.

Q: What minimum order quantity (MOQ) and lead times apply for bulk international shipments?

A: Standard MOQ is 1 metric ton (one pallet of 25 kg bags or one 1-ton jumbo bag) to accommodate ocean freight container optimization. Standard production and port-delivery lead time for regular stock grades is 10 to 15 days upon receipt of confirmed payment or LC, shipped in standard dry containers from major loading ports.

We are one of the most reliable iron sulfide- environmental pollution treatment chemicals suppliers in China, specialized in providing high quality customized products. Welcome to wholesale bulk iron sulfide- environmental pollution treatment chemicals in stock here from our factory. If you have any enquiry about free sample, please feel free to email us.

Iron Pyrite 150 Mesh, Pyrite Ore 0 15mm, Iron Sulfide 0 5mm