2000 t/d Iron Ore Concentrate Desulfurization Plant

Case Details

Introduction: The 2000 t/d Iron Ore Concentrate Desulfurization Plant is a specialized facility designed for efficient sulfur removal from iron ore concentrate, with a daily processing capacity of 2000 tons. It is engineered to address the critical issue of excessive sulfur content in iron ore concentrate, which severely impairs the quality of subsequent iron and steel products—such as increasing brittleness and reducing corrosion resistance of steel.

Adopting advanced mineral processing technologies and automated control systems, the plant ensures stable operation, high desulfurization efficiency (typically achieving a sulfur content below 0.3% in the final product, adjustable based on raw material properties and customer requirements), and low energy consumption. It is widely applicable to iron ore concentrates containing pyrite, pyrrhotite, and other sulfur-bearing minerals, providing high-quality raw materials for iron and steel enterprises while complying with strict environmental emission standards through integrated waste water and waste gas treatment systems.

• Raw Material Storage and Conveying

Iron ore concentrate with a sulfur content of 1.5%–3.0% is stored in a raw material silo. A variable-frequency screw conveyor controls the feeding rate, and the material is transported to a slurry mixing tank via a belt conveyor, ensuring a stable feed flow for subsequent processes.

• Slurry Preparation

In the mixing tank, the iron ore concentrate is mixed with recycled water (from the tailings dewatering system) to form a slurry with a solid content of 35%–40%. A high-speed agitator ensures uniform dispersion of the slurry, avoiding sedimentation. Meanwhile, a pH regulator (lime milk) is added to adjust the slurry pH to 9.0–10.5, creating an optimal chemical environment for flotation.

• Flotation Desulfurization

The prepared slurry is pumped into a mechanical agitation flotation cell (3–5 stages in series). Xanthate (collector) and pine oil (frother) are continuously added to the first-stage flotation cell. Under the action of the agitator, air is dispersed into fine bubbles; sulfur-bearing minerals (e.g., pyrite) adhere to the bubbles to form froth, which overflows from the top of the cell as sulfur concentrate (tailings). The non-floating ore pulp (mainly iron ore concentrate with reduced sulfur) flows into the next stage for deep desulfurization, ensuring thorough removal of sulfur-bearing minerals.

• Concentrate Dewatering

The desulfurized iron ore pulp (crude concentrate) is sent to a thickener for preliminary dewatering, reducing the water content to 50%–55%. The thickened pulp is then fed into a filter press, where it is pressed into filter cakes with a water content of 10%–12%. These filter cakes are the final low-sulfur iron ore concentrate, which is transported to the product silo for storage and shipment.

• Tailings and Waste Water Treatment

The sulfur concentrate (froth from flotation) is dewatered by a separate filter press and stored in a tailings yard for comprehensive utilization (e.g., as raw material for sulfuric acid production). The filtrate from the thickeners and filter presses is collected in a recycling water tank, treated by a sedimentation and filtration system to remove fine particles, and then reused in slurry preparation, realizing closed-circuit water circulation and zero wastewater discharge.

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