D. Hodouin et C. Ketata, VARIANCE OF AVERAGE STREAM COMPOSITIONS OBTAINED BY AUTOMATIC INCREMENTAL SAMPLING, International journal of mineral processing, 40(3-4), 1994, pp. 199-223
Citations number
19
Categorie Soggetti
Mineralogy,"Metallurgy & Mining","Engineering, Chemical
Mean values of stream compositions in mineral processing plants are fr
equently estimated by the analysis of a composite sample. This sample
is the result of an accumulation of material increments extracted at s
ystematic time intervals. The measurement error which is evaluated in
this study is the difference between the sample composition and the tr
ue composition of the total material which flows during the time perio
d of increment accumulation. The error variance is calculated assuming
that the species flowrate random variations are described by their va
riances and autocorrelation functions. The error is decomposed into tw
o contributions: the discretization error and the sampling error. The
results are compared to those of Gy's theory of particulate material s
ampling. This estimation of the measurement error variance is essentia
l for the application of data reconciliation or filtering techniques,
for gross error detection, and for the estimation of process performan
ce indicator reliability.