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Paper Information

Title: 

THE ACCURACY AND OPTIMIZATION OF SAMPLING SYSTEM OF THE SARCHESHMEH COPPER COMPLEX MINERAL PROCESSING PILOT PLANT

Type: PAPER
Author(s): YARAHMADI M.R.*,REZAEIAN H.,BANISI S.
 
 *MINERAL PROCESSING DIVISION, R & D CENTER, SARCHESHMEH COPPER COMPLEX, RAFSANJAN
 
Name of Seminar: PROCEEDING OF IRANIAN MINING ENGINEERING CONFERENCE
Type of Seminar:  CONFERENCE
Sponsor:  IRANIAN SOCIETY OF MINING ENGINEERING
Date:  2005Volume 1
 
 
Abstract: 

The evaluation of efficiency of the mineral processing plants and various unit operations requires accurate estimates of different parameters. These measured variables obtained by sampling are always subjected to systematic errors, which in turn could results in erroneous conclusions. In the mineral processing pilot plant of the Sarcheshmeh copper complex, in order to obtain overall samples from various streams of the flotation circuit after allowing sufficient time for the system to reach steady state, for a period of 45 minutes four sub-samples at times 0, 10, 25, 45 minutes are taken and combined. This sampling strategy has been used over the last twenty years with no clear indication of basic principles and the amount of error involved. Hence, a research project with the aim of assessment of the accuracy of the current sampling system and introducing an improved sampling procedure was initiated. In this research, 85 samples in the period of 8-hour working shift were taken and assayed for the copper content. The statistical analysis of the data at the 95% confidence level indicated that the sampling system is not accurate enough and the relative error of tailings reaches 12%. The processing of the same data with the variogram method showed that the sum of preparation and analysis errors is more than the error of taking samples. The ratio of these two errors for the feed, concentrate and final tailing streams were found to be 92/8, 73/26 and 68/32, respectively. The variogram method indicated that when sub-samples of 110, 20, 100 grams from feed, concentrate and final tailing streams, respectively, with the time intervals of 7.5 minutes to make the hourly composite samples are taken the relative error of assay estimates of these streams in turn will be 1.3, 0.7, 9.7%.

 
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