FGD Slurry Pumps — Corrosion & Wear Resistant Desulfurization Duty

Combined wear and corrosion duty — where the medium attacks the matrix between the hard carbides, a material chosen on hardness alone fails quickly. Selection follows pH first, abrasion second.

• A49 (≥600 MPa, HRC43) — low-pH duty at pH ≥4, flue gas and desulphurisation
• A33 (HRC35) — oxidising slurry at pH ≥1, phosphogypsum and mineral acids
• A25 (HB300–350) — weldable, allows on-site repair of large castings
• Rubber and polyurethane wet ends for fine high-concentration slurry
• Ceramic (silicon carbide) supplied as a separate pump series
• SMC-R / SMC-M / SMC-U configurations for severe mill circuit duty

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CE · EAC · ISO 9001 · ISO 14001 · ISO 45001

Overview

Corrosion and wear together are a harder problem than either alone. A material chosen purely for hardness fails quickly when the medium is acidic, because corrosion attacks the matrix between the hard carbides and the carbides are then lost mechanically. Our anti-wear anti-corrosive grades are formulated for that combined attack, and the selection follows the pH of the medium first and the abrasion second.

Ceramic slurry pump — working conditions

Model designation

Example: 150-SAZP-500

Grades for Combined Wear and Corrosion

Impact toughness (αk) values are confirmed at quotation. Grade availability varies by component and pump series.

Selecting by pH

• pH 5–12 — A05 high-chrome white iron. The medium is not aggressive enough to require a corrosion-specific grade.
• pH ≥4 — A49 (≥600 MPa, HRC43). Erosion resistance with corrosion resistance in low-pH service, specifically suited to flue gas and desulphurisation duty.
• pH ≥1 — A33 (HRC35). For oxidising slurry including phosphogypsum and nitric, sulphuric and phosphoric acid media.
• Weldable requirement — A25 cast steel (HB300–350), lower hardness but good combined resistance and weldable for repair.

Non-Metallic Options

• Rubber — wear and corrosion resistant elastomer wet ends for fine, high-concentration slurry without sharp angular particles. Corrosion resistance is inherent rather than dependent on a passive layer, which is an advantage in acidic duty.
• Polyurethane — for fine abrasive slurry in sliding-wear duty.
• Ceramic (silicon carbide) — for strong wear combined with corrosion. Ceramic wet ends are supplied as a separate pump series rather than as a liner option in the standard range, because the construction differs.

Mill Circuit and Heavy Wear Configurations

For severe mill circuit duty three wet-end configurations are offered on the high-efficiency range:

The unlined SMC-U build puts the wear material in the casing itself, in the same way as a gravel pump, and suits the coarsest and most impact-heavy duty in the range.

What to Send Us

The medium pH and temperature, the particle size distribution and solids concentration, and — most useful of all — the failed part and where it failed. Corrosion-assisted wear leaves a different surface from pure abrasion, and identifying which mechanism dominated usually changes the grade recommendation.

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