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Journal of the Southern African Institute of Mining and Metallurgy

versão On-line ISSN 2411-9717
versão impressa ISSN 0038-223X

J. S. Afr. Inst. Min. Metall. vol.110 no.6 Johannesburg Jun. 2010

 

JOURNAL PAPER

 

Bias testing of cross-belt samplers

 

 

G. LymanI; M. NelII; F. LombardIII; R. SteinhausIV; H. BartlettV

IMaterials Sampling and Consulting Pty Ltd, Australia
IIKumba Iron Ore, South Africa
IIIUniversity of Johannesburg, South Africa
IVMultotec Process Equipment, Johannesburg, South Africa
VConsultant, South Africa

 

 


SYNOPSIS

The cross-belt sampler is a device that is very widely used even though it has not been ratified by the Standards associations. This paper is concerned with the bias testing of two cross-belt sampler designs against stopped belt samples and a cross-stream cutter at the belt end. The bias analysis is carried out using size distribution as the analyte and conventional t-testing and the Hotelling T squared test, which are compared for their effectiveness. The paper considers the issue of detectable bias and the statistical planning of bias tests.


 

 

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References

1. REINERS, E. and MOHRHAUER, P. Hammer Sampler-a proven sampling unit, Aufbereitungs-Technik, vol. 30, no. 4. pp. 218-225.         [ Links ]

2. VAN DER MERWE, E. English; Ralph H, Device for sampling material from a moving belt conveyor, US Patent No. 5,115,688, filed 1990.         [ Links ]

3. LYMAN, G.J. Determination of Bias in Sampling Systems, Minerals Engineering, vol. 6. pp. 99-105.         [ Links ]

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