AS 4596-1999 pdf free.Copper , lead and zinc sulfide concentrates – Determination of mass of contained metal in a lot.
AS 4596 specifies the method for determining the mass of contained metal in a lot, based on the wet mass, moisture content and dry basis metal content of the lot. The procedure for estimating the variance and confidence intervals for the mass of contained metal is also specifIed.
2 Normative references
ISO 10251, Copper, lead and Zinc sulfide concentrates —Determination of iiiass loss of bulk material on drying.
ISO 12743, Copper, lead and zinc sulfide concentrates —Sampling procedures for determination of metal and moisture content.
ISO 12744, Copper, lead and zinc sulfide concentrates —Experimental methods for checking the precision of sampling.
ISO 12745, Copper, lead and zinc sulfide concentrates —Guide to precision and bias for mass measurement tech ii iq ties.
3 Definitions
For the purposes of this International Standard, the tollowing clelinitions apply.
3.1 lot: Quantity of concentrate to be sampled.
3.2 wet mass of the lot: Combined mass of concentrate and moisture of the lot at the time of weighing and sampling.
3.3 moisture determination: Quantitative measurement of the mass loss of the moisture test portion under the conditions of drying specified in ISO 10251.
3.4 chemical analysis: Quantitative determination of the required chemical constituents of the analysis test portion.
3.5 precision: Measure of the random variations within a set of measurements.
3.6 dry mass of the lot: Mass of concentrate in the lot after correcting for the mass of moisture in
the lot.
4 Determination of mass of contained metal
The mass of contained metal in a lot is determined from measurements of the wet mass, moisture
content and dry basis metal content.
4.1 Wet mass of the lot
The wet mass of’ the lot shall he determined using static scales, belt scales or draft surveys.
However, due to their superior precision, static scales are recommended.
4.2 Nloisture content of the lot
Samples for moisture determination shall be collected in accordance with ISO 12743. The moisture content of the lot shall be determined according to the procedure specified in ISO 10251.AS 4596 pdf download.