Measure the mining stream that operators actually need to control
“Mining slurry” covers very different duties: mill discharge, cyclone feed, concentrate, thickener underflow, tailings and transfer lines. Each has its own flow regime, particle distribution, gas risk, abrasion and control objective. A successful project names the exact stream and validates the reading against representative process evidence.
Non-nuclear continuous measurement
The Rhosonics SDM ECO uses a non-intrusive ultrasonic sensor for continuous slurry density measurement. It can provide operators and control systems with more frequent information than intermittent sampling alone.
Context determines meaning
Density must be interpreted with flow, process state and material properties. A stable reading can still be unrepresentative if the pipe is partly filled, the solids settle, or the sample and sensor see different material.
See the measurement in its process context
Application planning includes the surrounding process, safe access, representative sampling and verification—not only the analyser itself. PMA reviews these conditions together before recommending a measurement arrangement.
Three decisions for mining slurry density
Use process and maintenance knowledge together when selecting the point.
Process decision
State whether density supports grinding, classification, dilution, pumping, mass-flow calculation, thickening, filtration or tailings monitoring.
Hydraulic location
Review pipe fill, velocity, orientation, bends, valves, pumps, pressure, air entrainment and settling. Include low-flow and shutdown conditions.
Evidence plan
Define safe representative sampling, laboratory method, flow alignment and commissioning tests across water, normal slurry and expected changes.
Mining slurry density measurement pathway
- Name the stream and destination. Avoid a generic label such as “slurry line”.
- Define the decision and users. Identify who sees and acts on the result.
- Characterise the material. Record range, particle size, mineralogy, liquid, gas and temperature.
- Survey candidate locations. Check hydraulics, access, isolation and abrasion.
- Commission across the operating range. Align reference samples with process context.
- Retain traceable records. Store configuration, samples, trends and maintenance history.
Evidence to collect
Record online density with flow, pressure, pump state, ore type, throughput, water additions and sample results. Mark maintenance, flushing, shutdown and process transitions. For mass-flow use, validate the flow signal and calculation basis as separate inputs.
Limits, compatibility and safety
Changing mineralogy, particle size, dissolved solids, temperature and entrained air can affect interpretation or calibration. A density meter does not replace independent pressure, flow, geotechnical, containment or process-safety safeguards. Automated action should have defined invalid-signal handling.
Frequently asked questions
Where is slurry density commonly measured?
Potential points include grinding circuits, hydrocyclone feed, thickener underflow, tailings and transfer lines. The best point is the one that is representative of the required decision.
Can density provide mass flow?
Mass flow requires a valid density value, a suitable flow measurement and an agreed calculation. Each input and its alignment should be verified.
What about entrained air?
Air changes the acoustic and bulk behaviour of the stream and can make results unrepresentative. Location and process review should minimise and identify gas effects.
Can one calibration cover changing ore?
Do not assume it can. Material changes should be included in commissioning evidence and periodic review.
Sources and engineering review scope
PMA will review the named stream, process objective, slurry properties, hydraulics, pipe and fitting, sample plan, outputs and control integration. This page is application guidance, not a substitute for a site survey, chemical compatibility review, risk assessment or manufacturer-approved configuration.
Related analyser range
The SDM ECO provides continuous non-nuclear ultrasonic slurry density measurement for demanding mineral-processing duties.
View the relevant analyser range.
Map your mining slurry measurement point
Send PMA the process flow diagram, stream data, pipe details, operating range and reference sampling plan.