SAG mills, flotation cells and thickeners against a first-concentrate date
Commissioning software for concentrators where the grinding circuit, flotation bank and thickener train all have to run together before the first tonne of concentrate ships.
A concentrator is a chain of circuits — crushing, SAG and ball milling, flotation, thickening and filtration — where a fault in one stage stalls every stage downstream of it. Commissioning has to prove each circuit individually and then prove the whole plant runs as a system under real ore, with metallurgical performance tracked against the process design criteria. Deskely holds every mill, cell and thickener in one register with the ramp-up curve and first-concentrate gate built in.
- Circuits
- Grinding, flotation, thickening, filtration
- Process
- Dry run, wet commissioning, ramp-up
- Gate
- First concentrate
- Metric
- Recovery and grade against design
Choose your project type
The problem
The mill package, the flotation package and the thickener package are each commissioned in isolation, then bolted together and hoped for.
A SAG mill supplier commissions the mill and its lube system. A flotation equipment vendor commissions the cell banks and air supply. A thickener OEM proves rake torque and underflow density. Each vendor signs off its own scope and leaves, often before the circuits have ever run together on real ore.
When metallurgical performance data lives in separate lab sheets and separate vendor punch lists, the process engineer cannot answer the question that actually matters at the ramp-up review: is recovery tracking toward design, and if not, which circuit is the constraint.
Deskely puts every mill, cell, thickener and filter in one register with one status model, so plant readiness and metallurgical ramp-up are read from the same source instead of reconciled from five different spreadsheets.
Setting up the register
SAG mills, flotation cells, thickeners and filters are tagged assets with their own commissioning path.
Process flow diagrams, mechanical equipment lists and P&IDs are parsed into a reviewed register, so every mill, pump, flotation cell, thickener and filter press carries its design duty and its commissioning sequence from day one.
Pre-commissioning checklists, no-load runs, water commissioning and ore commissioning are templated once per equipment type and instantiated across the grinding circuit, the flotation bank and the thickener train.
Reagent dosing systems, air supply for flotation cells, and mill lube and cooling systems are commissioned as their own subsystems, because a fault in any one of them stalls the circuit it feeds regardless of how well the mechanical equipment itself was installed.
Wet commissioning and metallurgical ramp-up
First ore into the SAG mill starts a ramp-up curve that the whole plant is measured against for months.
Water commissioning proves pumps, pipework and instrumentation hold pressure and flow before a tonne of ore is fed; ore commissioning then proves throughput, power draw, grind size and cell froth stability against the process design criteria as feed rate climbs toward nameplate.
Flotation cell functional testing — froth depth control, air rate, reagent addition rate — is recorded per cell and per bank, with recovery and grade sampled and logged against the same commissioning window so a metallurgical shortfall can be traced back to a specific cell rather than blamed on the ore body.
Open findings from wet commissioning stay attached to the asset with an owner, so a thickener with erratic underflow density is not carried as closed simply because it ran for one shift without alarming.
Handover to operations
Operations inherits a metallurgical plant that has to hold design recovery through every ore blend it will ever see.
OEM manuals, wear part schedules, reagent safety data and as-built P&IDs sit against the same asset the metallurgist and maintenance planner will search for once the plant is running continuously.
Because the ramp-up record builds continuously against the register, a first-concentrate readiness pack is an export rather than a rebuild assembled the night before the operations review.
Every signature keeps a name, role and timestamp, which is what the process guarantee reconciliation with the EPC contractor and the plant's own metallurgical accounting will rely on once commissioning is formally closed out.
Process control system and interlock proving
A DCS that has been configured correctly still has to prove every interlock trips the right equipment before ore is fed at full rate.
A concentrator's distributed control system carries thousands of control loops and cause-and-effect interlocks linking mill feed, cyclone overflow, flotation air supply and thickener rake torque, and a single mis-mapped interlock — a mill overload that fails to trip the correct feed conveyor rather than an unrelated one — is invisible until the exact upset condition occurs on real ore.
Loop tuning against process design criteria is usually done by the DCS vendor's commissioning engineer working from a cause-and-effect matrix that the plant's own process team rarely sees in full, so when a trip behaves unexpectedly during ramp-up, nobody can quickly confirm whether the logic was ever actually tested against that matrix line.
Deskely tracks every interlock and control loop against its cause-and-effect matrix reference as a signed functional test, so a mill trip or an unplanned circuit shutdown during ramp-up can be checked against a proven test record in minutes instead of triggering a re-verification of the whole control philosophy.
What the first-concentrate review reads
The records that prove recovery and grade before the plant is judged against design.
A concentrator's acceptance case is metallurgical, not just mechanical: throughput on air means little if recovery is off design. The dossier ties mill run records, reagent commissioning and metallurgical sampling to the same tag so the ramp-up curve can be explained rather than just observed.
Mill no-load and loaded run record
Grinding circuit motors, gearboxes and liners perform within design power draw
Dry run, then wet commissioning under ore
Flotation reagent dosing commissioning record
Reagent addition rates and cell air flow match the metallurgical design basis
During wet commissioning, before recovery trials begin
Thickener and filtration circuit performance test
Underflow density and cake moisture meet the process design for downstream handling
Wet commissioning, tracked through ramp-up
Metallurgical sampling and assay reconciliation
Recovery and concentrate grade against feed grade match the design metallurgical balance
Continuously from first concentrate through ramp-up
Instrumentation loop check and interlock test
Level, density and flow control loops hold the process within its operating envelope
Pre-commissioning, before wet commissioning starts
Tailings pumping and pipeline pressure test
Slurry transport to the storage facility runs within its design pressure envelope
Before tailings are deposited from the new circuit
How it runs
From dry commissioning to first concentrate.
Concentrator programmes reward structure set up before ore is fed to the mill, because the ramp-up review is where every unresolved circuit interaction turns into a metallurgical shortfall nobody can explain.
- 01
Model the circuits
Crushing, grinding, flotation, thickening and filtration modelled as subsystems, each with its own completion path.
- 02
Parse the equipment set
PFDs, P&IDs and mechanical equipment lists drafted into a reviewed asset register with design duty attached.
- 03
Template the test set
No-load run, water commissioning and ore commissioning defined once per equipment type, instantiated across every mill, cell and thickener.
- 04
Gate first concentrate on signed evidence
Ramp-up readiness reported from signed records, with recovery and grade tracked against design criteria to close-out.
FAQ
Questions about Ore processing and concentrators scopes.
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