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Introduction to Session 2
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INTRODUCTION TO SESSION 2 I. D. N. Taylor .4I1g/(I .·\lIItrl([J 11 (; (l rIIiJUII /lill
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In this session on Flow Measurements in the Mineral Processing Industry, four papers that were originally scheduled for this session, were reduced to three due to the fact that the paper on Sensors in Ore Sorting was withdrawn for commercial reasons.
At Interkama, in 1986 one could see a capacitative magflowrneter which requires no intrusion into the pipe work. There were just coils placed around the pi~e work allowing any pipe lining to remal.n perfectly intact for hostile slurry flow streams.
In process plants the metallurgical accounting function needs accurate information. The trend over recent years for more information regarding the process has now become established with a need for better and more accurate information and for all this information to be made available immediately. The papers in this session will be addressing some of these areas of mineral process measurements.
In this session two of the papers will concern themselves with conventional flow measurement and calibration and the third will describe a novel mass flow and mass balance measuring system.
There are of course many special measurements for the gold extraction process such as some of the special developments that have emanated from the Anglo American Research Laboratories, such as the OLGA (On-Line Gold Analyser) which gives via a complex sampling system and an atomic absorption spectrophotometer an indication of the gold content. Another development is the cyanide monitor (CYCAD) which gives an accurate indication of the cyanide level in the circuit allowing an operator to maintain an optimum level without the excessive use of what is a very expensive additive. Currently development is virtually complete to combine these two analysers into one single analyser which is designed to indicate the gold content in the leach circuit. This instrument will be known as MIDAS. One of the exciting developments over the last few years has been the introduction and the wide acceptance of magnetic flowrneters. with minimum intrusion into the pipe work and its special lining just the two tips of the probes - one can get the flow accuracies that one is normally accustomed to in industrial flow measurements.
The first paper presented by Mr W. Brobeil from switzerland will deal with the ongoing AC versus DC magflow comparison and suggests an optimum design. The second paper presented by Mr B. White deals with the very important area of instrumentation support. All measurements are only believable if they are properly maintained and calibrated and this paper will give you a description of a flow test and calibration rig which was designed and implemented by the site staff at Rustenburg Platinum Mines. The third paper presented by Mr H. Potgieter will describe a novel method of mass flow measurement dev ised at th e Diamond Research Laboratory of De Beers. After a couple of years of development it has recently been made available as a production system and by the novel use of the power drawn by conveyor drive motors it offers a much less expensive alternative to conventional weightometers.
~Iill e ral
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SESSIO:'-i ~
\l ea sure l11ell lS
\lel;!\llIr ~ i c ;lll'r()('(.' ss ill ,l{.
Tra il " ';"" . S . .. \ Iri,a I ~ I HI'
INTRODUCTION TO SESSION 2 I. D. N. Taylor .4I1g/(I .·\lIItrl([J 11 (; (l rIIiJUII /lill
(11
.'i (l lllll .4 / w [J
In this session on Flow Measurements in the Mineral Processing Industry, four papers that were originally scheduled for this session, were reduced to three due to the fact that the paper on Sensors in Ore Sorting was withdrawn for commercial reasons.
At Interkama, in 1986 one could see a capacitative magflowrneter which requires no intrusion into the pipe work. There were just coils placed around the pi~e work allowing any pipe lining to remal.n perfectly intact for hostile slurry flow streams.
In process plants the metallurgical accounting function needs accurate information. The trend over recent years for more information regarding the process has now become established with a need for better and more accurate information and for all this information to be made available immediately. The papers in this session will be addressing some of these areas of mineral process measurements.
In this session two of the papers will concern themselves with conventional flow measurement and calibration and the third will describe a novel mass flow and mass balance measuring system.
There are of course many special measurements for the gold extraction process such as some of the special developments that have emanated from the Anglo American Research Laboratories, such as the OLGA (On-Line Gold Analyser) which gives via a complex sampling system and an atomic absorption spectrophotometer an indication of the gold content. Another development is the cyanide monitor (CYCAD) which gives an accurate indication of the cyanide level in the circuit allowing an operator to maintain an optimum level without the excessive use of what is a very expensive additive. Currently development is virtually complete to combine these two analysers into one single analyser which is designed to indicate the gold content in the leach circuit. This instrument will be known as MIDAS. One of the exciting developments over the last few years has been the introduction and the wide acceptance of magnetic flowrneters. with minimum intrusion into the pipe work and its special lining just the two tips of the probes - one can get the flow accuracies that one is normally accustomed to in industrial flow measurements.
The first paper presented by Mr W. Brobeil from switzerland will deal with the ongoing AC versus DC magflow comparison and suggests an optimum design. The second paper presented by Mr B. White deals with the very important area of instrumentation support. All measurements are only believable if they are properly maintained and calibrated and this paper will give you a description of a flow test and calibration rig which was designed and implemented by the site staff at Rustenburg Platinum Mines. The third paper presented by Mr H. Potgieter will describe a novel method of mass flow measurement dev ised at th e Diamond Research Laboratory of De Beers. After a couple of years of development it has recently been made available as a production system and by the novel use of the power drawn by conveyor drive motors it offers a much less expensive alternative to conventional weightometers.