EMC

Flotation Simulation & Modelling Software to Improve Grade & Recovery Metallurgy

In this video EMC Supasim flotation simulation program is used to simulate the performance of a copper lead zinc plant in southern Spain. Flotation kinetics of key streams are generated by conducting bench scale rate tests on either a laboratory prepared sample of mill feed or grab samples of pulp taken from the plant. And this type of rate test is known as a hot float. A grab sample may or may not be representative and if not, the flotation kinetics it generates will not be a true reflection of the streams floatation characteristics.

  • If this happens and you cannot repeat the test, what do you do?
  • How to use flotation kinetics to determine what is required to improve plant recovery?

flotation_circuit_flowsheet_simulatorWhat you see here is a flow sheet for the copper lead zinc plant where you have the copper circuits on your left, the zinc circuit on your right; both have reground mills. It looks very congested that is because it’s got a lot of options. These are valves where you can operate the circuit, in open circuit or in close circuit. And there’s a lead upgrade here. You produce copper concentrate ….Read more

How to Perform a Laboratory Flotation Test

how-to-run-a-flotation-test-on-plant-samplesThis is an overview of setting up and conducting a flotation rate test. The test is a means of determining the flotation characteristics of an ore. It is conducted in a laboratory scale cell usually with a volume of two point five litres. The intention is to generate relationships of cumulative recovery, mass pull and grade versus time and use these to evaluate the floatability of metal, mineral and gang. The video is not intended to be a detailed explanation of how to conduct a rate test. For that, download the test procedure shown here below. flotationThe purpose of this video is to outline the important aspects of setting up the test to ensure that flotation characteristics are correctly measured and the resulting data can be properly interpreted. How the data is used to determine flotation kinetics is a subject of a separate video. The key aspects are:Image result for Denver D12

  • the types and setup of the laboratory cell;
  • sample to be tested,
  • test conditions and
  • how the test is conducted.

The standard laboratory cell and cell ….Read more

Timed Flotation Test & Cumulative Grade Recovery Curve

grade-recovery-over-timed-flotationApart from conducting a rate test in the correct manner, it’s important to collect the right number of concentrates and at the right times; doing this will ensure that the data you generate maximizes your analysis of flotation response. To properly define the relationship between recovery and time, you need a minimum of four concentrates and four data points on the graph. flotation_recovery_over_timeThe timing of these concentrates is critical to ensure that the three major characterizing aspects of the recovery time curve are defined accurately. These aspects are the initial slope of the curve; the determination of fast floating rate is dependent on the accuracy of the slope. fast_floating_minerals_beginning_flotation_testFor this reason the first concentrate must be collected within two minutes; two minutes is the maximum time allowed. If concentrate is collected after this, calculated fast floating rate is less than its true value. slow_floating_mineral_grade_recovery_curve_timed_flotationThe second aspect is the slope of the curve at the end of the test; this determines the slow floating rate. ….Read more

Flotation Kinetics: Mass & Water Recovery VS Entrainment & Mineralogy

flotation_1

This covers the recovery of entrained solids with water and the relationship between mineralogy and flotation performance; both are described in terms of flotation kinetics. The starting points for the relationship between mass and water recovery other products of a flotation rate test. flotation_entrainmentIn addition to concentrate mass, metal or mineral and floatable gangue. If the mass of water in each concentrate has been measured, then a fourth set of kinetics can be added which defines water recovery. This is useful if dealing with ultra-fine material or silicate gangue which has been recovered mainly by entrainment by water carry over to concentrate rather than being recovered by true flotation. how_frother_affect_flotation_entrainmentKnowing the kinetics of water recovery is also useful as one means of classifying frothers. The graph shows the relationship between mass and water recovery for PGM ores in colours other than yellow and twenty two variability samples for a nickel ore in yellow.pgm_flotation_entrainment_and_mineralogy

For reference, profiles for different silica size fractions from research conducted by Zheng ….Read more

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