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and organic content, it is difficult to ground the residue from the aqua regia digestion to minus 325 mesh. The procedure is as follows: 1. Weigh the residue from the aqua regia digestion and pour it into a 250 mL polypropylene bottle (#1) with a magnetic stirrer 2. Add 45 mL 38% hydrochloric acid, 15 mL 70% nitric acid and 5 mL 48% hydrofluoric acid 3. Place the polypropylene bottle in a 400 mL beaker filled with about 100 mL of water; take the beaker and place it on a hot plate with magnetic stirring and set the temperature 150 °C for 1.5 hours 4. Remove the bottle from the beaker and add 40 mL of 30 g/L H3BO3 solution to the bottle 5. Place the bottle back in the beaker and let it react for another 30 minutes 6. Weigh and label a filter paper, Whatman No. 42, and record weight 7. Weigh a 250 mL polypropylene bottle (#2) and label 8. Filter the cooled solution into the 250 mL polypropylene bottle (#2) and rinse the magnetic stirrer and bottle (#1) with deionized water 9. Rinse the filter paper three times by deionized water 10. Add another 40 mL of 30g/L H3BO3 to the bottle (#2) 11. Weigh the bottle (#2) and add deionized water to make up around 300 g of the solution 12. Take 30 mL sample, store in a 50-mL polypropylene vial and label 4.2.3 Elemental Composition The elemental analysis of the shredded waste printed circuit boards was conducted by the two-step digestion described in Section 4.2.2.1 and 4.2.2.2. In order to obtain a representative result, ten digestions were performed. The digestion solution was diluted to satisfy the Total Solid Dissolved (TDS) required for ICP-MS and then analyzed by ICP-MS to determine the elemental composition of the sample. The contents of gold and silver are likely to be low after the dilution, which further resulted in increasing the uncertainty of the data from ICP-MS; therefore, Atomic Absorbance Spectroscopy (AA) was utilized to determine gold and silver contents by directly analyzingthedigestionsolution.Table4.1givesasummaryoftheelementalanalysis.Appendix C 39PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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