Blue Cube MQi Slurry Analyser




The Blue Cube MQi (Mineral Quantifier Inline) Slurry Analyser is designed for fast, accurate and reliable in-line measurement of the elemental and mineral composition of plant feed, tailing and concentrate slurries. This technology can measure light elements and minerals such as sulphide, sulphur, lithium etc.  The Slurry Analyser can also be calibrated on metals such as Ni, Cu and Fe.  The technology uses optical spectroscopy as opposed to harmful nuclear sources, X-ray devices, high intensity or high temperature, making the device inherently safe.   The Slurry Analyser has a small footprint with little infrastructure required.

The Blue Cube MQi Slurry Analyser will give a continuous signal (updated every 15 seconds) that can be used for process control. Recovery and grade can be improved by automation of level, air and reagent set points.

Mineral and elemental grades are measured in-line and in real-time by the Blue Cube slurry analyser. The MQi Slurry Analysers are suitable for installation in any plant environment and in process lines of any diameter

Advantages over Competing Products

  • Measure light elements and minerals
  • Fast continuous measurement
  • Very small footprint and infrastructure required
  • Lower capital cost
  • Lower ongoing maintenance


  • Data is available in 15 second intervals for faster measurement
  • Improved control over concentrate grade and quality
  • Increased recovery by incorporating into an Process Control System
  • Low ongoing maintenance requirement
  • Reduced need for time-consuming and labour-intensive manual sampling
  • Measure a number of streams (up to 7) with the multi-stream unit
  • Lower capital cost with multi-stream option


Mineral and elemental grades are measured in-line and in real-time by the Blue Cube slurry analyser. The technology used is inherently safe and based on diffused reflective spectroscopy. The MQi Slurry Analysers are suitable for installation in any plant environment and in process lines of any diameter.


With exceptional availability, a MQi Slurry Analyser avails data reliably at 15 second intervals. The fast data enables stabilisation through process control. The automatic manipulation of air addition, pulp levels and reagents are suggested for the control of grade and recovery in typical flotation circuits.


With the availability of real-time mineral and elemental grade, the effect of process changes can be tracked without having to do full plant surveys. The MQi Slurry Analyser can be used together with a mass flow indication to optimise recovery. The product grade can be optimised and the impurity content minimised to eliminate penalties.

The main components of the Blue Cube MQi Slurry Analyser are

  • Optical processor containing a spectrometer
  • Scan head with a sapphire glass window which is in contact with the slurry stream. Two optical fibres for transmitting and receiving light connect the scan head to the optical processor
  • Poppet sampler is used for taking calibration samples
  • Communications gateway for remote access;
  • Data processor which contains the calibration sets is used for processing the optical data and determining the mineral grades; and
  • Interface box which is used to connect the Blue Cube outputs to the plant control system

The following are examples of minerals and element suites measured in different types of minerals processing plants:

Cu Flotation Anode Production

  1. Copper (Cu) in it’s elemental form.
  2. Copper Sulphide (CuS)
  3. Acid Soluble Copper (determined from a diagnostic leach)

Phosphate concentrators

  1. P (Phosphorous)
  2. Ca/P (Calsium / phosphorous) ratio.
  3. Other elements like Mg and Si.

Sulfide gold concentrators

  1. S (elemental sulphur)
  2. Sulphide sulphur
  3. CaCO3 (Carbonates)
  4. As (Arsenic),
  5. C (carbonaceous matter) removal.

Ni flotation

  1. Ni (Nickel) – Nickel
  2. MgO and Talc
  3. Other light element concentrations.

Click here to view the Blue Cube MQi Slurry Analyser brochure.

Evaluation of the Blue Cube MQi Slurry Analyser for Application in an Advanced Control System for the Optimisation of a Gold Sulfide Flotation Circuit

At Barrick’s Porgera mine in Papua New Guinea the flotation circuit feeds sulfide concentrate slurry to a pressure oxidation circuit. In order to maximise gold recovery in the flotation plant and increase performance in the pressure oxidation process, there is a stringent requirement to maintain a stable and optimum sulfur grade. The gold recovery is directly affected by the sulfur grade as most of the gold at Porgera is submicroscopic and associated with the sulfides (disseminated pyrite).

Porgera considered various points in the flotation circuit for installing Blue Cube analysers. This was part of a plant upgrade to improve process control.  To read more click here

Slurry Application Explained

Below is a detailed clip on the how the Blue Cube MQi Slurry is applied to the slurry process.

Process IQ Pty Ltd

Unit 1 / 23 Gibberd Road Balcatta, WA 6021 Western Australia
Tel: +61 (0) 8 9240 4357
Fax: +61 (0) 8 6316 0486