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Content archived on 2024-04-15

THE APPLICATION OF HIGH INTENSITY MAGNETIC SEPARATION TO THE BENEFICIATION OF COMPLEX ORES

Objective

THE AIM OF THE PROPOSED RESEARCH IS TO DEVELOP A NEW TECHNIQUE IN HIMS TO IMPROVE SELECTIVITY IN THE SEPARATION OF FINE-GRAINED COMPLEX MINERAL MIXTURES AND TO DEVELOP MATHEMATICAL MODELS FOR THE PREDICTION OF SEPARATION PERFORMANCE AND FOR THE DESIGN OF PROCESS FLOWSHEETS.

THE CONCEPT OF THE NEW TECHNIQUE IS BASED ON AN INNOVATIVE APPROACH TO SELECTIVITY BY ONE OF THE ASSOCIATES. INSTEAD OF USING WATER TO TRANSPORT THE MINERAL GRAINS THROUGH THE MAGNETIC SEPARATOR, A PARAMAGNETIC LIQUID IS USED OF THE SUSCEPTIBILITY AS THE LESS MAGNETIC MINERAL. IN THIS WAY THE MAGNETIC FORCE ON PARTICLES OF THAT MINERAL WILL BE ELIMINATED AND SELECTIVITY THUS INCREASED.
The objectives of this research programme were to improve selectivity in high intensity high gradient magnetic separation (HGMS) and to develop a mathematical model of high intensity magnetic separation for the prediction of separation performance.

Mathematical modelling has been applied to HGMS to study the capture process in particular of monomineralic feed materials.
Modelling of separations between different minerals has so far been based on ideal deposition conditions and therefore has been of limited applicability to actual mineral processing. In view of this it was decided to develop a practical model in conjunction with the selectivity studies to predict separation performance and to be included in a general purpose simulation package for mineral processing.

Mechanical entrainment and magnetic capute of gangue minerals were shown to act in conjunction in conventional HGMS and paramagnetic liquids were shown to effectively reduce competitive magnetic capture of impurity minerals.
The modelling studies give an insight into the mechanisms that control the performance of a wet high intensity magnetic separation (WHIMS) type magnetic separator. A model has been formulated on an empirical basis and will be incorporated in a general purpose simulator for mineral processing.
THE TECHNIQUE TO BE DEVELOPED IS AIMED AT MAXIMISING SELECTIVITY IN THE SEPARATION OF MINERALS WITH RELATIVELY SMALL DIFFERENCES IN MAGNETIC SUSCEPTIBILITY SO THAT IT CAN BE APPLIED TO COMPLEX ORES. THE ASPECT OF SELECTIVITY IS THEREFORE OF PRIME IMPORTANCE IN THE PROPOSED RESEARCH WORK

LABORATORY TESTS AND MODELLING STUDIED WILL BE USED FOR IMPROVING SEPARATION PERFORMANCE AND PROCESS DESIGN

BILLITON RESEARCH AND THE UNIVERSITY OF SOUTHAMPTON WILL STUDY THE SEPARATION MECHANISM, NOVEL MATRIX SYSTEMS.

TO IMPROVE SELECTIVITY AND THE DESIGN AND CONSTRUCTION OF PILOT SCALE SEPARATORS - WARREN SPRING LABORATORY WILL CARRY OUT A GENERALISED STUDY OF THE SEPARATION, MEASURE THE MAGNETIC PROPERTIES OF MINERALS, LIQUID AND MATRIX ELEMENT AND DEVELOP MATHEMATICAL MODELS TO DESCRIBE THE PROCESS AND TO BE USED INTO PROCESS SIMULATION MODELS.

Topic(s)

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Call for proposal

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Coordinator

Billiton Research BV
EU contribution
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Address

6800 AA Arnhem
Netherlands

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Total cost
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Participants (1)