Campaigns across a spectrum of the minerals industry can be conducted including Gold, Base Metals and PGMs with laboratory and pilot-scale capabilities including:
Successful testwork programmes have included process development, bench and pilot, on common sulphide minerals as well as non-sulphide minerals. Scope of work undertaken ranges from ad hoc testwork to full bankable feasibility study level and consulting.
The comminution section consists of various types and sizes of crushers and mills for crushing and milling samples from about 75mm in size to a few microns. For all of the equipment where dry comminution is involved, dust extraction systems are in place for safe and dust-free operation.
The following crushers are available:
The following mills are available:
Size classification is mainly done by screening either in batch or continuous mode. For batch screening, a sieve shaker is used, which is loaded with screens of various aperture sizes as required. For continuous screening, a Sweco or Rhologan screen is used.
A Mozley cyclone rig with different cyclones, vortex finders and spigots is also available for either batch or continuous size classification. For batch Mozley cyclone classification a minimum of 30 litres slurry is required
Gravity separation can be conducted via Holman/Wilfley or Gemini shaking table, centrifugal gravity concentrators or Spiral.
Two types of centrifugal gravity separation units are available, namely the Knelson and Falcon concentrators.
The flotation section consists of the laboratory flotation testwork area and the pilot flotation test work area.
For benchtop laboratory tests, Denver D12 flotation machines are used. Varius units are available with 10 litres, 4 litres, 2 litre and 1-litre stainless steel cells.
The following types of batch flotation tests can be carried out:
In the pilot plant facitlity, flotation testwork can be carried out either in batch or continuous mode.
The continuous milling circuit consists of:
The continuous flotation circuit consists of reagent conditioning tanks followed by pneumatic G-cell and V-cells. The throughput of the cells is 200 – 400 kg/hour depending on the circuit.
Also available are conventional Denver tank cells of 200 litres, 100 litres and 50-litre capacity which can be configured in a continuous rougher and cleaner mode.
The core technology of MMSA is based on the Aachen™ high shear reactor (HSR) technology which is used for relatively straight forward pre-oxidation, boosting of leach kinetics or the more demanding partial sulphide dissolution, often in conjunction with ultra-fine grinding (UFG). The plant size industrial pieces of Aachen reactor equipment are represented by laboratory units which are utilised to apply the desired degree of oxidation to a pre-leach slurry through effective gas dispersion and shear based reactivity enhancement. The achieved benefits would usually be measured through reagent consumption savings, enhanced kinetics or additional gold dissolution. This is determined on the basis of in-house leach test results.
The laboratory is equipped to perform from simple bottle roll tests to monitored, stirred leaches (tracking pH, Eh DO). The largest leach test currently feasible would be sized around 200 L. All leach work conducted can be validated by full metal balances including solid, liquid and carbon metal content.
The same Aachen HSR technology forms the basis of MMSA’s CN-D™ cyanide destruction process. This proprietary process simply relies on correct combinations of SO2, oxygen and shear to effect catalytic oxidation of weak acid dissociable cyanide. MMSA can perform scouting or pilot test work to evaluate the technical feasibility for a specific application. The results are used for a techno-commercial assessment of the process application including a comparison to competing processes.
Should reagent consumptions for other technologies not be known, standard detox procedures based on peroxide, SMBS/air, ferrous sulphate or other reagents can be executed at MMSA laboratories and the resulting reagent consumptions are used in the techno-commercial evaluation.