Valves for Mining and Metallurgy industry

Heyue valves recommended selection sheet in Mining and Metallurgy industry

Category

Valve Type

Application Scenario

Specific Locations

Advantages

Key Selection Points

Core Valves

Knife Gate Valve

Handles slurries with high solid content: ore pulp, sludge, tailings, concentrate, coal slurry, slag slurry.

Flotation process in concentrators, thickener underflow, tailings pipelines, slurry pump inlet/outlet, backfill stations.

Gate cuts through fibers and solids; full-bore design minimizes flow resistance and clogging; seat has self-cleaning action.

Body: Carbon steel or cast iron, lined with wear-resistant rubber, polyurethane, or ceramic. Gate: Surface hardening required (e.g., hardfacing with alloy, chrome carbide, spray welding). Extreme duty: full stainless or duplex steel. Actuation: Mostly pneumatic or hydraulic for quick shut-off and high thrust.

Metal-Seated Ball Valve & Plug Valve

High-pressure slurries, media with fine particles, high-temperature lines, or processes prone to crystallization.

High-pressure slurry pipelines, solvent extraction, high-temperature slurry flash systems, coal-chemical black/grey water systems.

High sealing class (up to ANSI VI), good wear resistance, full-bore design reduces sedimentation, some plug valves are self-cleaning.

Sealing Faces: Must use metal hard-sealing (e.g., tungsten carbide, Stellite). Seat and ball/plug require lapping. Actuator: Typically large torque pneumatic or hydraulic actuators for reliable shut-off under high friction.

Water-Cooled or High-Temperature Gate/Butterfly Valve

High-temperature metallurgical flue gas, hot air, gas pipelines; high-temperature melt transport systems (special design).

Blast furnace hot blast stoves, converter/EAF flue gas dedusting, sinter machine flue gas, copper/aluminum smelting waste heat boiler inlet/outlet.

Operates at 800C or higher via water-cooled jacket or special high-temperature alloy (e.g., Cr-Mo steel, 310S stainless steel).

Cooling: Ensure continuous water supply. Use extended bonnet to protect packing. Materials: Medium temp (<600C): WCB+STL. High temp (>600C): heat-resistant steel. Sealing: Flexible graphite packing and metal seals at high temperatures.

Important General & Specialty Valves

Wear-Resistant Ceramic Valve

Extremely abrasive powder and granular pneumatic conveying systems.

Pulverized coal preparation/conveying, ore powder injection, fly ash handling, raw cement/cement clinker lines.

Wetted parts lined with or made of engineering ceramics (alumina, silicon carbide). Hardness second only to diamond. Wear life tens of times longer than ordinary steel.

Types: Ceramic wear-resistant ball valve, ceramic pinch valve, ceramic discharge valve.

Parallel Double Disc Gate Valve

Reliable shut-off for high-pressure, high-temperature, large-diameter clean or fine-particle media.

Blast furnace gas mains, high-pressure oxygen lines (strict degreasing required), steel mill high-pressure descaling systems.

Wedging mechanism between discs ensures forced sealing. Reliable sealing, good adaptability to temperature changes.

Diaphragm Valve & Lined Valve (Corrosion-Resistant)

Strongly corrosive chemical media in mineral processing and hydrometallurgy: sulfuric acid, hydrochloric acid, caustic, solvents.

Leaching tanks, extraction tanks, electrolyte circulation, acid/alkali tank inlet/outlet, wastewater treatment.

Media is completely isolated from valve body metal, offering excellent corrosion resistance.

Lining Material: Select based on media: PTFE (F4), F46, PO, PP, rubber, etc. Body Material: Carbon steel lined or stainless steel.

Check Valve & Air Release / Pressure Relief Valve

Check Valve: Prevents backflow of slurry or high-pressure water to protect pumps. For solids-laden media: wafer dual-plate or rubber flap check valves (low flow resistance, clog-resistant). Air Release Valve: Installed at pipeline high points to remove air, preventing air locks. Safety/Relief Valve: Essential for protecting pressurized vessels and piping systems.

Actuation Method Choice

Pneumatic Actuator

Mainstream choice. Fast action, simple structure, excellent explosion-proof performance (intrinsically safe). Ideal for dusty mining environments with potential flammable gases. Used for quick shut-off valves (e.g., knife gate, ball valves).

Electric Actuator

Suitable for applications requiring precise modulation or located in dispersed, air-source-lacking areas. Used for some control valves or remotely operated clean water valves.

Hydraulic Actuator

Used for valves requiring extremely high thrust/torque (large diameter, high pressure), e.g., blast furnace gas shut-off valves. System is complex but provides immense force.