IS0 20904:2006 pdf download.Hard coal-Sampling of slurries.
The fundamental error results from the composition heterogeneity of The lot. i.e. the heterogeneity that is inherent to the composition of each particle making up the solids component of the lot. The greater the differences in the compositions of partides, the greater the composition heterogeneity and the higher the fundamental error variance, The fundamental error can never be completely eliminated. It is an inherent error resulting from the variation In composition of the particles In the slurry being sampled.
The segregation and grouplng error results from the distribution heterogeneity of the sampled material (Pitard, 1993161). The ckstribution heterogeneity of a lot is the heterogeneity answlg from the manner in which particles are distnbuted in the slurry. It can be reduced by taking more increments, but it can never be completely eliminated.
A number of the components of the total sampling error, namely ED. EE and E. can be minimized or reduced to an acceptable level by correct design of the sampling procedure.
4.2.2 Preparation error
In this context, the preparation error. 4. includes errors associated with non-selective sample preparation operabons that should not change mass, such as sample transfer, flocculation, draining and filtering, drying, crushing, grinding or mixing. It does not include errors associated with sample division, Preparation errors include sample contamination, loss of sample material, alteration of the chemical or physical composition of the sample, operator mi5takes, fraud or sabotage. These errors can be made negligible by correct design of the sample plant and by staff training. For example, cross-stream slurry cutters should have caps to prevent entry of splashes when the cutter is in the parked position and it is necessary to take care during tittering to avoid loss of fines that are still suspended in the water to be discarded.
The segregation and grouplng error results from the distribution heterogeneity of the sampled material (Pitard, 1993161). The ckstribution heterogeneity of a lot is the heterogeneity answlg from the manner in which particles are distnbuted in the slurry. It can be reduced by taking more increments, but it can never be completely eliminated.
A number of the components of the total sampling error, namely ED. EE and E. can be minimized or reduced to an acceptable level by correct design of the sampling procedure.
4.2.2 Preparation error
In this context, the preparation error. 4. includes errors associated with non-selective sample preparation operabons that should not change mass, such as sample transfer, flocculation, draining and filtering, drying, crushing, grinding or mixing. It does not include errors associated with sample division, Preparation errors include sample contamination, loss of sample material, alteration of the chemical or physical composition of the sample, operator mi5takes, fraud or sabotage. These errors can be made negligible by correct design of the sample plant and by staff training. For example, cross-stream slurry cutters should have caps to prevent entry of splashes when the cutter is in the parked position and it is necessary to take care during tittering to avoid loss of fines that are still suspended in the water to be discarded.
