WeirFlow Mining — Slurry & Mineral Processing - Precision slurry-handling and mineral-processing authority

WeirFlow Mining — Slurry Pumps & Hydrocyclones for Hard-Rock Circuits

High-chrome wet ends, ISO 4406 hydraulic cleanliness and cut-size curves tuned for SG 1.4–2.2 slurries — sized against feed size, discharge opening and target output capacity (t/h), backed by 18 mine-belt parts hubs.

42,000+Pump operating hours logged / qtr

18Mine-belt parts hubs

< 16hMean-time-to-repair

Mill-Discharge Slurry Pump — Engineering Spec

Baseline configuration for a 65% solids copper mill-discharge duty. Values shift with ore SG, particle size and head — request a site-matched curve before purchase.

Hydraulics & Duty
Flow range	180 – 1,200 m³/h (site-tuned impeller trim)
Total dynamic head	18 – 45 m slurry head
Solids concentration	Up to 70% by weight · SG 1.4–2.2
Wet End & Materials
Impeller / volute	High-chrome white iron 27% Cr · optional rubber-lined
Seal arrangement	Expeller + gland or dual mechanical seal
Wear monitoring	Shell thickness ports + vibration probe pad
Drive & Documentation
Motor class	IE3 / IE4 · VFD-ready baseplate
Cleanliness	Bearing oil ISO 4406 18/16/13 at factory flush
Deliverables	Duty curve PDF · NPSHr sheet · wear-part BOM

Hydraulics & Duty

Flow range

180 – 1,200 m³/h (site-tuned impeller trim)

Total dynamic head

18 – 45 m slurry head

Solids concentration

Up to 70% by weight · SG 1.4–2.2

Wet End & Materials

Impeller / volute

High-chrome white iron 27% Cr · optional rubber-lined

Seal arrangement

Expeller + gland or dual mechanical seal

Wear monitoring

Shell thickness ports + vibration probe pad

Drive & Documentation

Motor class

IE3 / IE4 · VFD-ready baseplate

Cleanliness

Bearing oil ISO 4406 18/16/13 at factory flush

Deliverables

Duty curve PDF · NPSHr sheet · wear-part BOM

Six Hard Specs That Keep Circuits Online

High-Chrome Wet Ends

27% Cr white-iron impellers and liners sized for abrasive mill discharge, not soft-water transfer.

ISO 4406 Bearing Cleanliness

Every pump ships at 18/16/13 oil cleanliness with a logged factory flush sample.

Cut-Size Matched Cyclones

Hydrocyclone packs sized to D50 targets for flotation feed and mill circulating load.

8,000h Wear Rebuild Cycle

OEM-equivalent liners, throatbush and impeller kits staged before unplanned downtime hits.

18 Mine-Belt Parts Hubs

Certified field service engineers, mean-time-to-repair under 16 hours on contracted plants.

MSHA / ISO Plant Safety Pack

Guarding, lockout points and AS 4024-aligned documentation for mill-floor audits.

Andean Copper Mill — Discharge Train Rebuild

Background: a 45 kt/d copper concentrator saw mill-discharge pumps drift outside the 85–105% BEP window after ore SG climbed to 2.0 and feed size into the secondary crusher tightened. Process: WeirFlow Mining re-trimmed impellers, reset gland hydraulic system pressure, and staged high-chrome liners ahead of the next planned stop while hydrocyclone apexes were audited for flotation D50. Result: mean-time-to-repair stayed under 16 hours, cut size held within ±5 µm for six months, and output capacity through the classification cluster recovered to the plant’s 2.1 Mt slurry quarterly baseline — without changing the motor frames.

Limitation: tramp-metal events and sump redesigns sit outside this wear model; sites that cannot meet NPSH drawings should request a site-matched recalculation before freezing impeller diameter.

Questions Metallurgists Ask Before Spec Freeze

Slurry Pumping

How do you set impeller trim for a 65% solids mill-discharge duty?

We match BEP to the site head curve at operating SG, then trim impeller diameter so the pump runs 85–105% of BEP at normal circulating load. NPSHr is verified against sump geometry before the order is released.

When is rubber lining preferred over high-chrome iron?

Rubber wins on finer, less angular particles and lower impact energy; high-chrome is preferred for coarse mill discharge and crusher underflow where gouging abrasion dominates.

Classification

How often should hydrocyclone apexes be inspected?

On abrasive copper or gold circuits, apex and vortex-finder wear checks every 250–400 operating hours keep cut size within ±5 µm of the flotation feed target.

Can one cyclone cluster serve both mill and flotation duties?

Usually no. Mill classification and flotation feed need different D50 targets; we size separate packs or provide change-out apex kits with documented cut-size curves.

Crushing & Screening Wear

What jaw-plate life should we expect on hard granite?

At 180–220 t/h hard granite, expect 600–900 hours per jaw set depending on CSS, jaw opening and feed size; we trend tonnage-per-millimeter wear and vibration frequency on the screen deck rather than calendar time alone.

Jaw crusher or impact crusher for primary hard rock?

Jaw crushers stay the safer primary choice when feed size and ore hardness swing widely (Mohs ≤9) and maintenance crews want a simple discharge opening CSS adjust. Impact crushers win when asphalt or concrete aggregate needs a higher cubicity product and the plant can accept higher wear-part cost for that shape. WeirFlow Mining documents both paths with expected output capacity (t/h) so the bid package records the trade-off instead of a slogan.

Aftermarket Parts

Are WeirFlow liner kits drop-in for legacy wet ends?

Kits are dimensioned to published OEM interfaces for common mill-discharge frames. We confirm bolt circle, shaft sleeve and seal housing before shipping a first article.

Duty Charts, Cut-Size Guides & Wear Surveys

Spec Sheets

Mill-Discharge Slurry Pump — Hydraulic Curve Pack (PDF)
Heavy-Duty Froth Pump — Wet-End Options (PDF)
Hydrocyclone Cluster — Cut-Size Selection Sheet (PDF)

Process Curves

SG 1.6 / 1.8 / 2.0 Pump Head Curves (PDF)
Cyclone D50 vs Apex Diameter Chart (PDF)

Wear & Reliability

Sample liner wear-rate trend report (PDF)
Bearing oil ISO 4406 sampling SOP (PDF)

Plant Safety Packs

MSHA / ISO mill-floor guarding checklist (PDF)
Lockout points for slurry pump rebuild (XLSX)